POLAROGRAPHY AND VOLTAMMETRY OF ULTRASMALL COLLOIDS - INTRODUCTION TO A NEW FIELD

被引:76
作者
HEYROVSKY, M
JIRKOVSKY, J
机构
[1] Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, 182 23 Prague 8
关键词
D O I
10.1021/la00011a020
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Small colloidal particles of a semiconductor nature yield polarographic and voltammetric diffusion-controlled currents which differ, by the form as well as by the information contents, from the currents obtained with true solutions. The electrode reaction proceeds here either as a volume or as a surface process according to whether Faradaic charge is transferred to the conduction band and consumed in the volume of the particle or is transferred to and consumed in the surface of the particle. In polydisperse colloidal solutions each particle contributes to the net current according to its size; different size implies different diffusion coefficient, different Faradaic charge, and different reduction/oxidation potential. Hence, in polarography the slope of the wave and the half-wave potential and in voltammetry the peak potential depend on the particle size distribution. Basic experimental material was gathered with ultrasmall SnO2, TiO2, and mixed TiO2Fe2O3 colloids. In the electroreduction of protonated SnO2 and TiO2 colloids in acidic solutions, where the electrode process starts by reduction of the surface protons, the smaller particles are reduced at less negative potentials than the bigger ones.
引用
收藏
页码:4288 / 4292
页数:5
相关论文
共 34 条
  • [1] THE ELECTROCHEMISTRY OF COLLOIDAL SEMICONDUCTOR PARTICLES - THEORY
    ALBERY, WJ
    BARTLETT, PN
    PORTER, JD
    [J]. JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1984, 131 (12) : 2892 - 2896
  • [2] THE ELECTROCHEMISTRY OF COLLOIDAL SEMICONDUCTOR PARTICLES - EXPERIMENTS ON CDS AND TIO2
    ALBERY, WJ
    BARTLETT, PN
    PORTER, JD
    [J]. JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1984, 131 (12) : 2896 - 2900
  • [3] H2S-SENSITIVE THIN-FILM FABRICATED FROM HYDROTHERMALLY SYNTHESIZED SNO2 SOL
    ANDO, M
    SUTO, S
    SUZUKI, T
    TSUCHIDA, T
    NAKAYAMA, C
    MIURA, N
    YAMAZOE, N
    [J]. JOURNAL OF MATERIALS CHEMISTRY, 1994, 4 (04) : 631 - 633
  • [4] BAHNEMANN DW, 1993, ISR J CHEM, V33, P115
  • [5] EFFICIENT PHOTOCATALYSIS OF THE IRREVERSIBLE ONE-ELECTRON AND 2-ELECTRON REDUCTION OF HALOTHANE ON PLATINIZED COLLOIDAL TITANIUM-DIOXIDE IN AQUEOUS SUSPENSION
    BAHNEMANN, DW
    MONIG, J
    CHAPMAN, R
    [J]. JOURNAL OF PHYSICAL CHEMISTRY, 1987, 91 (14) : 3782 - 3788
  • [6] CHLOROPHYLL-B-MODIFIED NANOCRYSTALLINE SNO2 SEMICONDUCTOR THIN-FILM AS A PHOTOSENSITIVE ELECTRODE
    BEDJA, I
    HOTCHANDANI, S
    CARPENTIER, R
    FESSENDEN, RW
    KAMAT, PV
    [J]. JOURNAL OF APPLIED PHYSICS, 1994, 75 (10) : 5444 - 5446
  • [7] EFFECTS OF METAL-ION DOPANTS ON THE PHOTOCATALYTIC REACTIVITY OF QUANTUM-SIZED TIO2 PARTICLES
    CHOI, WY
    TERMIN, A
    HOFFMANN, MR
    [J]. ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH, 1994, 33 (10): : 1091 - 1092
  • [8] EFFECT OF GAS-DIFFUSION PROCESS ON SENSING PROPERTIES OF SNO2 THIN-FILM SENSORS IN A SIO2/SNO2 LAYER-BUILT STRUCTURE FABRICATED BY SOL-GEL PROCESS
    FENG, CD
    SHIMIZU, Y
    EGASHIRA, M
    [J]. JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1994, 141 (01) : 220 - 225
  • [9] FOJTIK A, 1984, BER BUNSEN PHYS CHEM, V88, P969, DOI 10.1002/bbpc.19840881010
  • [10] INTERFACIAL ELECTRON-TRANSFER IN COLLOIDAL SNO2 HYDROSOLS PHOTOSENSITIZED BY ELECTROSTATICALLY AND COVALENTLY ATTACHED RUTHENIUM(II) POLYPYRIDINE COMPLEXES
    FORD, WE
    RODGERS, MAJ
    [J]. JOURNAL OF PHYSICAL CHEMISTRY, 1994, 98 (14) : 3822 - 3831