A catalyst superior to carbon-supported-platinum for promotion of the oxygen reduction reaction: reduced-polyoxometalate supported palladium
A catalyst superior to carbon-supported-platinum for promotion of the oxygen reduction reaction: reduced-polyoxometalate supported palladium
复制标题
一种优于碳载铂的促进氧还原反应的催化剂：还原多金属氧酸盐负载钯
DOI：
10.1039/c5ta02196k
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发表时间：
2015-01-01
影响因子：
11.9
通讯作者：
Wei, Zidong
中科院分区：
文献类型：
--
作者：
Xie, Xiaohong;Nie, Yao;Wei, Zidong
The high solubility of polyoxometalates (POMs) in basic electrolytes limits their practical applications. Fortunately, we found that this shortcoming can be overcome by electrochemically reducing the POMs. The reduced POMs (rPOM) are extremely stable in alkaline solutions and can participate in electrocatalytic cycles. Herein, we present a novel rPOM as a Pd-catalyst-substrate to achieve a high catalytic performance towards the oxygen reduction reaction (ORR). Interestingly, although rPOM alone has very low catalytic activity, the Pd/rPOM hybrid catalyst exhibits excellent electrocatalytic performance for ORR in alkaline media, even better than the commercial Pt/C catalyst. The much improved ORR activity of Pd/rPOM is based on electron delocalization between the Pd and the rPOM support, causing a down-shift in the d-band structure of the Pd NPs. Furthermore, the rPOM in the Pd–rPOM hybrid serves as an assistant catalyst, facilitating the decomposition of the harmful hydrogen peroxide intermediates. The method reported here will promote broader interest in the further development of other new catalysts for real-world applications.
