| Application of Scanning Tunneling Microscopy to Studies of Electrode Surfaces |
JUL 94 |
7 pages |
| Authors:
Allen J. Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY AND BIOCHEMISTRY
|
 | This project involved the study of a variety of different surfaces and structures in gaseous and liquid environments using the scanning tunneling microscope (STM) and other scanning probe microscopes with the aim of obtaining a better understanding of electrode surfaces and the processes occuring on these surfaces. With the STM we investigated chemical changes on the surface of electrodes, e.g., corrosion, passivation, and biochemical activities, and studied the energetics for ... |
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| Electrochemical and Scanning Tunneling Microscopic Study of Dealloying of Cu3Au |
20 SEP 91 |
6 pages |
| Authors:
Thomas P. Moffat; Fu-Ren F. Fan; Allen J. Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
| Dealloying of Copper gold alloys has been examined by in-situ STM and several electrochemical methods. Three different regimes of behavior were noted. At low overpotentials, clustering of gold atoms occurs near sites of copper dissolution. This is essentially a two-dimensional process. The formation and smoothing of these clusters by capillary action, monitored in real time, demonstrated the highly mobile nature of the surface species. At higher potentials, the electrode is ... |
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| Electrochemistry in Near-Critical and Supercritical Fluids. 8. Methyl Viologen, Decamethylferrocene, Os(bpy)3(2+) and Ferrocene in Acetonitrile and the Effect of Pressure on Diffusion Coefficients under Supercritical Conditions |
20 JUL 89 |
25 pages |
| Authors:
Carlos R. Cabrera; Allen J. Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
| The cyclic voltammetry (CV) of methyl viologen (MV2+), decamethylferrocence (DMFc), Os(bpy)3(2+) (bpy+2,2'-bipyridine) and ferrocene (Fc) was studied at high temperatures and pressures in a small cell (7.5 ml) where the pressure and temperature could be varied independently. While the CV of MV(2+) and OS(bpy)3(3+) remained well-behaved with reversible of quasi- reversible waves only into the near-critical region (up to ca 230 C), Fc and DMFc showed well-defined behavior under supercritical ... |
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| Electrochemistry in Near-Critical and Supercritical Fluids. 7. SO2 |
12 MAY 89 |
14 pages |
| Authors:
Carlos R. Cabrera; Edwin Garcia; Allen J. Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
| We describe here the cyclic voltammetry (CV) and chronamperometry of Fe(bpy)3+2 (bpy=2,2'-bipyridine) in SO2 at temperatures up to 174 C, above the critical point of SO2(Tc=158 C, Pc=77.8 atm), and discuss the effect of temperature on the diffusion coefficient (D) and the electrochemical behavior. Near critical and supercritical fluids are of interest because the solvent properties are very different than those of the liquid form and are adjustable over a ... |
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| Electrogenerated Chemiluminescence |
JUN 88 |
10 pages |
| Authors:
Allen J. Bard; TEXAS UNIV AT AUSTIN
|
| Electrogenerated chemiluminescence (ECL) has been investigated in a variety of systems under various conditions. Eleven completed publications plus one manuscript in preparation address the following areas: 1. ECL of novel inorganic complexes. 2. ECL from peroxyoxalate/luminescer systems. 3. ECL in micelle systems. 4. ECL at polymer modified electrodes. 5. Electroluminescence at semiconductor electrodes. 6. ECL from systems containing no added luminescer. 7. Inverse photoemission from metal electrodes. Keywords: Electrogenerated chemiluminescence, ... |
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| High-Pressure Electrochemical Oxidation of Benzene at a Lead Dioxide Electrode in Aqueous Bisulfate Solutions at 25 to 250 C |
DEC 87 |
27 pages |
| Authors:
William M. Flarsheim; Keith P. Johnston; Allen J. Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
| The oxidation of benzene at a lead dioxide electrode which produces predominantly benzoquinone, maleic acid, and carbon dioxide, has been investigated in aqueous NaHSO4 solutions as a function of temperature up to 250 C. An increase in the benzene concentration does not increase the concentration of benzoquinone formed at high temperature, which is different from the behavior at 25 C. The formation of biphenyl at high temperature was also discovered. ... |
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| Electrochemistry in Near-Critical and Supercritical Fluids. 5. The Dimerization of Quinoline and Acridine Radical Anions and Dianions in Ammonia from -70C to 150C |
JUL 87 |
|
| Authors:
Richard M. Crooks; Allen J. Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
 | An experimental apparatus capable of supporting electrochemical measurements in ammonia at high temperatures and pressures is described. The dimerization reactions of the radical anions of quinoline and acridine were studied over a 220 C temperature range in ammonia. The cyclic voltammetric and chronoamperometric experiments were analyzed by the theory for reversible dimerizations. At low temperature the dimerization was totally irreversible, but at elevated temperatures the rate of the back reaction ... |
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| Electrochemistry in Near-Critical and Supercritical Fluids. 6. The Electrochemistry of Ferrocene and Phenazine in Acetonitrile between 25C and 300C |
JUL 87 |
|
| Authors:
Richard M. Crooks; Allen J. Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
| Cyclic voltammetry in MeCN at various temperatures and pressure, including supercritical conditions, are described. The reduction wave of phenazine in MeCN/CF3SO3Na was reversible or nearly reversible up to 200 C. Above 200 C the second reduction wave coalesced with the first. The oxidation of ferrocene in CH3CN was quasi-reversible between 25 and 285 C. Above the critical temperature (Tc) the standard heterogeneous electron transfer (k) decreased. The diffusion coefficients (D) ... |
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| Polymer Films on Electrodes. 22. Electrochemical, Spectroscopic, and Transmission Electron Microscopic Studies on Morphological Changes in Films of Polymeric Surfactants |
DEC 86 |
32 pages |
| Authors:
Yu-Min Tsou; Hsu-Yang Liu; Allen J. Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
| An electroactive polymeric surfactants with pendent long-chain viologen redox groups, PCMS-VC16, was synthesized, by the reaction of poly(chloromethylstyrene) with N-hexadecyl-4(4'-pyridyl)pyridinium bromide. Films of this polymeric-surfactant on glassy carbon electrodes were studied by electrochemical, spectroscopic (absorption-probe), and electron spin resonance techniques. The results suggest that upon reduction of the viologen groups in aqueous solution, the structure of the polymeric surfactant becomes more compact, probably because of reorganization induced by a decrease ... |
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| Electrochemistry in Near-Critical and Supercritical Fluids. 4. Nitrogen Heterocycles, Nitrobenzene, and Solvated Electrons in Ammonia at Temperatures to 150C |
SEP 86 |
|
| Authors:
Richard M. Crooks; Allen J. Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
| The electrochemistry of pyrazine quinoxaline, phenazine and solvated electrons in near-critical and supercritical ammonia was investigated by cyclic voltammetry and Chronoamperometry and compared to that in liquid ammonia at -40 C. The reductions of pyrazine, quinoxaline and phenazine at room temperature, and in the supercritical fluid (SCF), occur reversibly or quasi-reversible and result in stable products (anion radicals or dianions) on the voltammetric time scale. The electrochemistry fo nitrobenzene was ... |
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| Digital Simulation of the Measured Electrochemical Response of Reversible Redox Couples at Microelectrode Arrays: Consequences Arising from Closely Spaced Ultramicroelectrodes |
22 AUG 86 |
|
| Authors:
Allen J. Bard; Joseph A. Crayston; Gregg P. Kittlesen; Theresa V. Shea; Mark S. Wrighton; MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF CHEMISTRY
|
| Diffusion to arrays of closely spaced (1.2 micrometer to 0.2 micrometer) ultramicroelectrodes (50 micrometers x 2.3 micrometers) was studied by digital simulation and experimentally by examining the redox behavior of Ru(NH3)6(3+) in H20. Cylindrical diffusion of solution species resulted in quasi-steady-state currents at the microband electrodes. Generation-collection experiments, analogous to rotating ring-disk collection experiments, resulted in larger generator currents than those observed at a single microelectrode due to the back ... |
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| Digital Simulation of the Measured Electrochemical Response of Reversible Redox Couples at Microelectrode Arrays: Consequences Arising from Closely Spaced Ultramicroelectrodes |
22 AUG 86 |
|
| Authors:
Allen J. Bard; Joseph A. Crayston; Gregg P. Kittlesen; Theresa V. Shea; Mark S. Wrighton; MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF CHEMISTRY
|
| Diffusion to arrays of closely spaced (1.2 micron to 0.2 micron) ultramicroelectrodes (50 micron x 2.3 micron) was studied by digital simulation and experimentally by examing the redox behavior of Ru(NH3)6(3+) in H2O. Cylindrical diffusion of solution species resulted in quasi-steady-state currents at the microband electrodes. Generation-collection experiments, analogous to rotating ring-disk collection experiments, resulted in larger generator currents than those observed at a single microelectrode due to the back ... |
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| Digital Simulation of the Measured Electrochemical Response of Reversible Redox Couples at Microelectrode Arrays: Consequences Arising from Closely Spaced Ultramicroelectrodes. Revision |
APR 86 |
|
| Authors:
Allen J. Bard; Joseoh A. Crayston; Gregg P. Kittlesen; Theresa V. Shea; Mark S. Wrighton; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
| Diffusion to arrays of closely spaced (1.2 micrometer to 0.2 micrometer) ultramicroelectrodes (50 micrometers x 2.3 micrometers) was studied by digital simulation and experimentally by examining the redox behavior of Ru(NH3)6(3+) in H2O. Cylindrical diffusion of solution species resulted in quasi-steady-state currents at the microband electrodes. Generation-collection experiments, analogous to rotating ring-disk collection experiments, resulted in larger generator currents than those observed at a single microelectrode due to the back ... |
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| Electrochemistry in Near-Critical and Supercritical Fluids. 3. Studies of Br(-), I(-), and Hydroquinone in Aqueous Solutions |
FEB 86 |
|
| Authors:
William M. Flarsheim; Yu-Min Tsou; Isaac Trachtenberg; Keith P. Johnson; Allen J. Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
| A new type of apparatus has been constructed for carrying out electrochemistry in nearcritical and supercritical aqueous solutions. The following systems have been studied at a platinum electrode: H2O/O2, I(-)/I2, Br(-)/Br2, and hydroquinone/benzoquinone. The compact, alumina flow-cell can be heated or cooled quickly, and can be recharged with fresh electrolyte solution while at high temperature and pressure. A large reduction in the potential required for the electrolysis of water was ... |
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| Polymer Films on Electrodes. 13. Incorporation of Catalysts into Electronically Conductive Polymers: Iron Phthalocyanine in Polypyrrole |
26 APR 1983 |
|
| Authors:
Randy A. Bull; Fu-Ren Fan; Allen J. Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
| Tetrasulfonated iron phthalocyanines (FePcS) can be incorporated into electronically conducting polypyrrole by electrochemical polymerization of pyrrole in the presence of FePcS. The FePcS modified glassy carbon electrodes catalyzed the reduction of O2 at potentials 250 to 800 mV less negative than at bare glassy carbon or at polypyrrole-coated glassy carbon not containing FePcS. Rotating ring-disk experiments indicated some hydrogen peroxide formation at most pH's. However at high pH essentially exclusive ... |
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| Semiconductor Electrodes. 51. Efficient Electroluminescence at ZnS electrode in Aqueous Electrolytes |
01 APR 1983 |
|
| Authors:
Fu-Ren Fan; Patrick Leempoel; Allen J. Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
| Electroluminescence (EL) on ZnS was studied in aqueous solutions containing various redox species. For species able to generate strongly oxidizing intermediates, such as peroxydisulfate or hydrogen peroxide, bright blue luminescence was observed during cathodic polarization at potentials near to or negative of flat-band potential (Vfb) of ZnS. For solutions containing supporting electrolyte alone at various pH's, no emission was detectable even at potentials 7 volts negative of Vfb. This suggests ... |
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| Electrogenerated Chemiluminescence. 42. The Electrochemistry and Electrogenerated Chemiluminescence of the Tris(2,2'-bipyrazine)ruthenium(II) system |
31 MAR 1983 |
|
| Authors:
Jaime Gonzales-Velasco; Israel Rubinstein; R. J. Crutchley; A. B. P. Lever; Allen J. Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
| The electrochemical behavior and electrogenerated chemiluminescence (ecl) of of Ru(bpz)3(2+) (as the PF6- salt) in acetonitrile solutions was investigated. Oxidation to the +3 form and reduction to the +1, 0, -1 and -2 forms occur at potentials about 0.5V more positive than the corresponding bipyridine complex. Emission characteristic of Rub(bpz)3(2+) is produced upon the electron transfer reaction between the +3 and +1 species. Weak emission also results from reaction of ... |
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| Semiconductor Electrodes. 50. Effect of Mode of Illumination and Doping on Photoelectrochemical Behavior of Phthalocyanine Films |
25 FEB 1983 |
|
| Authors:
Patrick Leempoel; Fu-Ren F. Fan; Allen J. Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
| The behavior of photoelectrochemical (PED) cells composed of Sno2 or Pt electrodes with coatings of different phthalocyanines (Pc) -H2PC, ZnPc, MgPc, (CuPc, InPc) 1 was investigated. Spectral sensitization at the Sn02/Pc interface leads to photooxidation currents, while efficient photoreduction occurs at the Pc/solution interface through bulk generation of charge carriers. The presence of both anodic and cathodic photocurrents leads to different net photocurrent responses for back and front side illumination, ... |
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| Electrogenerated Chemiluminescence. 41. Electrogenerated Chemiluminescence and Chemiluminescence of the Ru(2,2'-bpy)3(2+)-S2O8(2-) System in Acetonitrile-Water Solutions |
22 MAR 1982 |
|
| Authors:
Henry S. White; Allen J. Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
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| The Design of Semiconductor Photoelectrochemical Systems for Solar Energy Conversion |
21 DEC 1981 |
|
| Authors:
Allen J. Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
| The principles and applications of semiconductor electrodes in photoelectrochemical (PEC) cells for carrying out useful chemical reactions are described. The factors in the design of efficient and stable systems and semiconductor particulate systems constructed on the basis of PEC cell principles are discussed. (Author) |
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| Semiconductor Electrodes. 43. The Effect of Light Intensity and Iodine Doping on the Stabilization of n-Silicon by Phthalocyanine Films |
21 DEC 1981 |
|
| Authors:
Patrick Leempoel; Mauricio Castro-Acuna; Fu-Ren F. Fan; Allen J. Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
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| Electrogenerated Chemiluminescence. 40. A Chemiluminescent Polymer Based on the Tris(4-Vinyl-4'-Methyl-2,2'-Bipyridyl)Ruthenium(II) System |
14 DEC 1981 |
|
| Authors:
Hector D. Abruna; Allen J. Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
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| Photoelectrosynthesis and Photocatalysis at Semiconductor Electrodes |
01 AUG 1981 |
|
| Authors:
Allen J. Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
| The principles and applications of semiconductor electrodes in photoelectrochemical (PEC) cells for carrying out useful chemical reactions are described. The factors in the design of efficient and stable systems and semiconductor particulate systems constructed on the basis of PEC cell principles are discussed. (Author) |
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| Photoelectrochromic Display Device. |
02 FEB 1981 |
|
| Authors:
Allen J. Bard; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A photoelectrochromic display device having a semiconductor electrode, and a counterelectrode made of a selected metallic material is presented. The electrode and counterelectrode are immersed in an aqueous solution containing heptyl viologen. The device is usable as a display device, as a storage battery, and as an alternating current photoelectric generator. As a display device, the cell requires only two leads rather than multiple leads and complicted electrical addressing and ... |
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| Semiconductor Electrodes. XXXIII. Photoelectrochemistry of n-Type WSe2 in Acetonitrile. |
06 JAN 1981 |
|
| Authors:
Henry S. White; Fu-Ren F. Fan; Allen J. Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
| The photoelectrochemical behavior of n-type WSe2 single crystal electrodes in acetonitrile solutions containing several redox couples was investigated. Electrodes with discontinuities in the van der Waals' surface show large dark currents and recombination of electrons with photooxidized solution species. Pretreatment of such a surface with Cl(-) passivates these dark active sites and increases the photocurrent density. The observed photopotentials at WSe2 for redox couples with potentials, V sub redox, more ... |
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| Polymer Films on Electrodes. 5. Electrochemistry and Chemiluminescence at Nafion-Coated Electrodes |
04 DEC 1980 |
|
| Authors:
Israel Rubinstein; Allen J. Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
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| Electrogenerated Chemiluminescence. 39. Reactions of Solvated Electrons in Liquid Ammonia |
30 OCT 1980 |
|
| Authors:
Kingo Itaya; Allen J. Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
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| The Heterogeneous Photocatalytic Decomposition of Benzoic Acid and Adipic Acid on Platinized TiO2 Powder. The Photo-Kolbe Decarboxylative Route to the Breakdown of the Benzene Ring and to the Production to Butane. |
29 OCT 1980 |
|
| Authors:
Ikuichiro Izumi; Fu-Ren F. Fan; Allen J. Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
| The heterogeneous photocatalytic decomposition of adipic acid in deaerated aqueous solutions containing a suspension of platinized TiO2 (anatase) powder leads to the formation of CO2 and butane with lesser amounts of valeric acid and negligibly small quantities of oligomeric materials. A mechanism for this photo-Kolbe reaction, which yields different products than the electrochemical Kolbe reaction, is proposed. The photodecomposition of benzoic acid in oxygen-containing solution at platinized TiO2 was also ... |
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| On the Role of Surface States in Semiconductor Electrode Photoelectrochemical Cells. |
27 OCT 1980 |
|
| Authors:
Allen J. Bard; Fu-Ren F. Fan; Alberto S. Gioda; G. Nagasubramanian; Henry S. White; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
| Surface states that occur at the semiconductor-liquid interface play an important role in the behaviour of that interface and affect the efficiency of photoelectrochemical solar devices. The nature of such states and evidence for their existence will be briefly reviewed. Their role in dark electron transfer reactions for redox couples with energies within the band-gap region and in mediating surface recombinations will be discussed. The importance of Fermi level pinning ... |
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| Electrogenerated Chemiluminescence. 38. Emission Intensity-Time Transients in the Tris(2,2'-bipyridine)ruthenium(II) System |
20 OCT 1980 |
|
| Authors:
J. D. Luttmer; Allen J. Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
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| The Heterogeneous Photocatalytic Oxidation of Hydrocarbons on Platinized TiO2 Powders. |
28 AUG 1980 |
|
| Authors:
Ikuichiro Izumi; Wendell W. Dunn; Keith O. Wilbourn; Fu-Ren F. Fan; Allen J. Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
| The photodecomposition in oxygen-containing solutions at platinized TiO2 yields predominantly CO2 as the reaction product, with intermediate production of hydroxylated compounds. A mechanism for the reaction based on photogeneration of hydroxyl radicals at the TiO2 surface is proposed. (Author) |
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| Electrogenerated Chemiluminescence. 37. Aqueous Ecl Systems Based on Ru (2,2'-bipyridine) 3(2+) and Oxalate or Organic Acids |
09 JUN 1980 |
|
| Authors:
Israel Rubinstein; Allen J. Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
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| Polymer Films on Electrodes. 4. Nafion-Coated Electrodes and Electrogenerated Chemiluminescence of Surface-Attached Ru(bpy)3(2+), |
09 JUN 1980 |
|
| Authors:
Israel Rubinstein; Allen J. Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
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| Semiconductor Electrodes. 24. Behavior and Photoelectrochemical Cells Based on p-Type GaAs in Aqueous Solutions. |
01 DEC 1979 |
|
| Authors:
Fu-Ren F. Fan; Allen J. Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
| The electrochemical Behavior of single crystal p-type GaAs in aqueous solutions containing several redox couples (I3(-)/I(-), Fe(III)/Fe(II), Sn(IV)/Sn(II), Eu(III)/Eu(II)) in the dark and under irradiation is described. The observation that the difference in potential between that for the onset of photocurrent and the standard potential for the redox couple was 0.4 to 0.5 V, independent of the couple, leads to a revised model for semiconductor/electrolyte solution interface with semiconductors having ... |
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| Semiconductor Electrodes. 26. Spectral Sensitization of Semiconductors with Phthalocyanine. |
31 OCT 1979 |
|
| Authors:
Calvin D. Jaeger ; Fu-Ren F. Fan ; Allen J. Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
| Spectral sensitization by metal-free phthalocyanine (H2Pc) films was observed on various semiconductor electrodes (single crystal n-TiO2, n-SrTiO3, n-WO3, n-ZnO, n-CdS, n-CdSe, n0Si, and n-GaP; SnO2 conducting glass). The spectral response of the sensitized photocurrent was generally the same as the absorption spectrum of the phthalocyanine. The rather thick (400 A to 1 micron H2Pc films showed both anodic and cathodic photocurrents depending upon the applied potential. The anodic photocurrents represented ... |
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| Semiconductor Electrodes. 27. The p- and n-GaAs- N,N'-Dimethyl-4,4'-Bipyridinium System. Enhancement of Hydrogen Evolution on p-GaAs and Stabilization of n-GaAs Electrodes. |
01 OCT 1979 |
|
| Authors:
Fu-Ren F. Fan ; Benjamin Reichman ; Allen J. Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
| The photoelectrochemical (PEC) behavior of N,N'-dimethyl-4,4'-bipyridinium (methyl viologen,MV (2+) at p- and n-type GaAs electrodes in aqueous solutions was studied. The reduction of MV(2+) at irradiated p-GaAs occurs at potentials approx. 450 mV less negative than those found at Pt electrode. The catalyzed reaction of the Photogenerated MV with water to produce hydrogen by irradiation of p-GaAs was demonstrated and the use of the MV-system as an intermediate in the ... |
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| Semiconductor Electrodes 25. The p-GaAs/Heptyl Viologen System. Photoelectrochemical Cells and Photelectrochromic Displays. |
01 OCT 1979 |
|
| Authors:
Benjamin Reichman ; Fu-Ren F. Fan ; Allen J. Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
| The photoreduction of aqueous solutions of 1,1'-diheptyl-4,4'-bipyridyl (heptyl viologen, HV(2+)) bromide on p-GaAs was investigated. Under irradiation with light of wavelengths below 885 nm, the photoreduction of HV(2+) to form a precipitate of violet HVBr occurs on p-GaAs at a potential of approx 400 mV more positive than the reversible potential of the HV(2+)/HVBr couple on Pt. Oxidation of HVBr back to soluble HV(2+) occurs in the dark at more ... |
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| Spectral Sensitization of the Heterogeneous Photocatalytic Oxidation of Hydroquinone in Aqueous Solutions at Phthalocyanine-Coated TiO2 Powders. |
01 AUG 1979 |
|
| Authors:
Fu-Ren F. Fan; Allen J. Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
| The photocatalyzed reaction of hydroquinone with oxygen at TiO2 (anatase) powders coated with metal-free or magnesium phthalocyanine under irradiation with light of energy less than the TiO2 band gap is described. The behavior at the powders is correlated with current-potential curves at single crystal n-type TiO2 electrode and an energy level scheme for the reaction is proposed. (Author) |
|
| Electrochemical and Photoelectrochemical Studies of Excess Electrons in Liquid Ammonia, |
17 Jul 1979 |
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| Authors:
Allen J. Bard; Allen J Bard; Kingo Itaya; Kingo Itaya; Richard E. Malpas; Richard E Malpas; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
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| Application of Photothermal Spectroscopy to in-Situ Studies of Films on Metals and Electrodes, |
18 Jun 1979 |
|
| Authors:
George H. Brilmyer; George H Brilmyer; Allen J. Bard; Allen J Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
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| Simultaneous Determination of Quantum Efficiency and Energy Efficiency of Semiconductor Photoelectrochemical Cells by Photothermal Spectroscopy, |
18 Jun 1979 |
|
| Authors:
Akira Fujishima; Akira Fujishima; Yasuhisa Maeda; Yasuhisa Maeda; Kenichi Honda; Kenichi Honda; George H. Brilmyer; George H Brilmyer; Allen J. Bard; Allen J Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
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| Electrogenerated Chemiluminescence. XXXVI. The Production of Steady Direct Current ECL in Thin Layer and Flow Cells, |
15 FEB 1979 |
|
| Authors:
George H. Brilmyer; Allen J. Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
|
| Successive Electron Transfers to Molecules with Identical Interacting Centers - The Electroreduction of alpha, omega-9,9 -Dianthrylalkanes, |
11 NOV 1978 |
|
| Authors:
Kingo Itaya; Allen J. Bard; Michael Szware; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
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| Semiconductor Electrodes. 19. An Investigation of S/Se Substitution in Single Crystal CdSe and CdS Photoelectrodes by Electron Spectroscopy. |
01 NOV 1978 |
|
| Authors:
Rommel N. Noufi; Paul A. Kohl; James W. Rogers Jr.; John M. White; Allen J. Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
| Photoelectron spectroscopy studies verify the occurrence of S/Se substitution in single crystal CdSe and CdS photoanodes when used in photoelectrochemical cells containing S2- or Se2- solutions. A possible mechanism of the S/Se exchange is discussed as well as its consequences on the electrode stability and the output parameters of the photoelectrochemical cells. (Author) |
|
| Photothermal Spectroscopy, |
15 JUL 1977 |
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| Authors:
George H. Brilmyer; Akira Fujishima; K. S. V. Santhanam; Allen J. Bard; TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
|
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Reports by Author
