Electroreduction of oxygen on gold-supported nanostructured palladium films in acid solutions
Electroreduction of oxygen on gold-supported nanostructured palladium films in acid solutions
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DOI：
10.1016/j.electacta.2010.05.092
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发表时间：
2010-09
影响因子：
6.6
通讯作者：
Ave Sarapuu;A. Kasikov;Naomi K Wong;C. Lucas;Gita Sedghi;R. Nichols;K. Tammeveski
中科院分区：
文献类型：
--
作者：
Ave Sarapuu;A. Kasikov;Naomi K Wong;C. Lucas;Gita Sedghi;R. Nichols;K. Tammeveski
研究了在多晶Au衬底上制备的厚度为0.25- 10 nm的Pd薄膜（Pd/Au）上氧的电化学还原。用电子束蒸发法制备了Pd膜，并用旋转圆盘电极（RDE）法在0.1MHClO4和0.05MH2SO4溶液中研究了Pd膜的氧还原。Pd覆盖层的表面形貌通过扫描隧道显微镜（STM）检查。在所有Pd/Au电极上，O2还原主要通过4 e −途径进行。在H2SO 4溶液中氧还原比活度较低，且随Pd膜厚度的减小而略有降低。在HClO 4中，SA较高，并且不显著依赖于膜厚度。所有电极的塔菲尔斜率值在低电流密度下接近− 60 mV，在高电流密度下接近− 120 mV。
The electrochemical reduction of oxygen on thin Pd films with a nominal thickness of 0.25–10nm on polycrystalline Au substrate (Pd/Au) was studied. The Pd films were prepared by electron beam evaporation and oxygen reduction was studied in 0.1M HClO4and 0.05M H2SO4solutions using the rotating disk electrode (RDE) method. The surface morphology of Pd overlayers was examined by scanning tunnelling microscopy (STM). O2reduction predominantly proceeds through 4e−pathway on all Pd/Au electrodes. The specific activity (SA) of oxygen reduction was lower in H2SO4solution and decreased slightly with decreasing the Pd film thickness. In HClO4, the SA was higher and not significantly dependent on the film thickness. The Tafel slope values close to −60mV at low current densities and −120mV at high current densities were found for all electrodes.