Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7734351 | Journal of Power Sources | 2015 | 9 Pages |
Abstract
Multi-component nanoporous platinum-ruthenium-copper-osmium-iridium (np-PtRuCuOsIr) electrocatalyst has been facilely fabricated by chemical dealloying of mechanically alloyed AlCuPtRuOsIr precursor. The np-PtRuCuOsIr catalyst exhibits a typical three-dimensional bi-continuous interpenetrating ligament/channel structure with a length scale of â¼2.5Â nm. The np-PtRuCuOsIr catalyst reaches a higher level in the mass activity (857.5Â mAÂ mgPtâ1) and specific activity (3.0Â mAÂ cmâ2) towards methanol oxidation compared to the commercial PtC catalyst (229.5Â mAÂ mgPtâ1 and 0.5Â mAÂ cmâ2 respectively). Moreover, the CO stripping peak of np-PtRuCuOsIr is 0.54Â V (vs. SCE), 130Â mV negative shift in comparison with the commercial PtC (0.67Â V vs. SCE). The half-wave potential of np-PtRuCuOsIr is 0.900Â V vs. RHE, 36Â mV positive compared with that of the commercial PtC (0.864Â V vs. RHE). The np-PtRuCuOsIr catalyst also shows 1.8 and 3.8 times enhancement in the mass and specific activity towards oxygen reduction than the commercial PtC. Moreover, the np-PtRuCuOsIr alloy exhibits superior oxygen reduction activities even after 15Â K cycles, indicating its excellent long-term stability. The present np-PtRuCuOsIr can act as a promising candidate for the electrocatalyst in direct methanol fuel cells (DMFCs).
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Xiaoting Chen, Conghui Si, Yulai Gao, Jan Frenzel, Junzhe Sun, Gunther Eggeler, Zhonghua Zhang,