THE ORIGIN OF OSCILLATIONS DURING HYDROGEN-PEROXIDE REDUCTION ON GAAS SEMICONDUCTOR ELECTRODES

被引:26
作者
KOPER, MTM [1 ]
VANMAEKELBERGH, D [1 ]
机构
[1] UNIV UTRECHT,DEBYE INST,DEPT CONDENSED MATTER,3508 TA UTRECHT,NETHERLANDS
关键词
D O I
10.1021/j100011a041
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The origin of current and potential oscillations during hydrogen peroxide reduction on n-type GaAs semiconductor electrodes is investigated. Impedance measurements clearly demonstrate that the current oscillations are caused by a negative impedance in conjunction with the electrolyte or external resistance. By considering a simple kinetic model which combines earlier mechanistic models proposed for the H2O2 and H+ reduction on GaAs, it is shown that oscillations can occur only if the negative impedance is caused by an anomalous dependence of the band bending on the electrode potential, i.e., if an increase of the Fermi level of the n-type semiconductor results in an increase in the band bending. This effect is assumed to be caused by a hydride layer formed electrochemically during the concomitant proton reduction. Impedance measurements confirm the role of the band-bending anomaly.
引用
收藏
页码:3687 / 3696
页数:10
相关论文
共 37 条
[1]  
[Anonymous], 1980, ELECTROCHEMISTRY SEM
[2]   IMPEDANCE PLANE DISPLAY OF A REACTION WITH AN ADSORBED INTERMEDIATE [J].
ARMSTRONG, RD ;
HENDERSON, M .
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1972, 39 (01) :81-+
[3]   ELECTROCHEMICAL AND PHOTOELECTROCHEMICAL BEHAVIOR OF N-GAAS AND P-GAAS IN THE PRESENCE OF H2O2 [J].
BADAWY, WA ;
PFUHL, G ;
PLIETH, WJ .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1990, 137 (02) :531-537
[4]   REDUCTION OF H2O2 AT CUINSE2 (PHOTO)CATHODES .2. SUSTAINED AND TRIGGERED OSCILLATIONS [J].
CATTARIN, S ;
TRIBUTSCH, H .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1992, 139 (05) :1328-1332
[5]   INTERFACIAL REACTIVITY AND OSCILLATING BEHAVIOR OF CHALCOPYRITE CATHODES DURING H2O2 REDUCTION .1. ELECTROCHEMICAL PHENOMENA [J].
CATTARIN, S ;
TRIBUTSCH, H .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1990, 137 (11) :3475-3483
[6]   REDUCTION OF H2O2 AT CUINSE2 (PHOTO)CATHODES .1. CHARACTERIZATION OF THE ELECTRODE-ELECTROLYTE INTERFACE [J].
CATTARIN, S ;
TRIBUTSCH, H ;
STIMMING, U .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1992, 139 (05) :1320-1328
[7]  
CHIZMADZEV YA, 1960, DOKL AKAD NAUK SSSR, V133, P745
[8]  
DEGN H, 1968, T FARADAY SOC, V64, P13248
[9]   ON ELECTROCHEMICAL OSCILLATOR [J].
DELEVIE, R .
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1970, 25 (02) :257-+
[10]   ON COUPLING OF INTERFACIAL AND DIFFUSIONAL IMPE-DANCES,AND ON EQUIVALENT CIRCUIT OF AN ELECTRO-CHEMICAL CELL [J].
DELEVIE, R ;
POSPISIL, L .
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1969, 22 (03) :277-&