Electroreduction of oxygen at tungsten oxide modified carbon-supported RuSex nanoparticles

被引:31
作者
Kulesza, P. J.
Miecznikowski, K.
Baranowska, B.
Skunik, M.
Kolary-Zurowska, A.
Lewera, A.
Karnicka, K.
Chojak, M.
Rutkowska, I.
Fiechter, S.
Bogdanoff, P.
Dorbandt, I.
Zehl, G.
Hiesgen, R.
Dirk, E.
Nagabhushana, K. S.
Boennemann, H.
机构
[1] Univ Warsaw, Dept Chem, PL-02093 Warsaw, Poland
[2] Hahn Meitner Inst Berlin GmbH, Abt Solare Energet, D-14109 Berlin, Germany
[3] Univ Appl Sci Esslingen, Dept Basic Sci, D-73728 Esslingen, Germany
[4] Forschungszentrum Karlsruhe Helmholtz Gemeinschaf, ITC CPV, Karlsruhe, Germany
关键词
oxygen reduction; rotating disk voltammetry; acid electrolyte; ruthenium-selenium nanoparticles; tungsten oxide;
D O I
10.1007/s10800-007-9349-6
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
WO3-modified carbon-supported bi-component ruthenium-selenium, RuSex (Ru, 20; Se, 1 wt%), nanoparticles were dispersed in the form of Nafion-containing inks on glassy carbon electrodes to produce electrocatalytic interfaces reactive towards electroreduction of dioxygen in acid medium (0.5 mol dm(-3) H2SO4). It was apparent from the rotating disk voltammetric experiments that the reduction of oxygen proceeded at WO3-modified electrocatalyst at more than 100 mV more positive potential when compared to bare (WO3-free) RuSex system (that had been prepared under analogous conditions and deposited at the same loading of 156 mu g cm(-2)). The ring-disk rotating voltammetric measurements show that, while the production of hydrogen peroxide intermediate was significantly lower, the kinetic parameter (heterogeneous rate constant) for the oxygen reduction was higher for WO3-modified RuSex (relative to bare RuSex). Comparison was also made to highly-efficient Vulcan-supported Pt or Pt/Co nanoparticles: while the half-wave potential for the oxygen reduction at WO3-modified carbon-supported RuSex was still more negative relative to the potentials characteristic of Pt-based electrocatalysts, the oxygen reduction rotating disk voltammetric current densities (measured at 1600 rpm) were almost identical.
引用
收藏
页码:1439 / 1446
页数:8
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