Modulation of compositions and electrocatalytic activities of quaternary nanoporous Pt-based alloys via controllable dealloying
Modulation of compositions and electrocatalytic activities of quaternary nanoporous Pt-based alloys via controllable dealloying
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通过可控脱合金调节四元纳米多孔铂基合金的成分和电催化活性
DOI：
10.1016/j.ijhydene.2016.04.098
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发表时间：
2016-06
影响因子：
7.2
通讯作者：
Zhang Zhonghua
中科院分区：
文献类型：
--
作者：
Sun Junzhe;Yan Xuejiao;Zhao Bingge;Liu Lei;Gao Yulai;Zhang Zhonghua
Electrocatalysts are crucial materials for applications of direct methanol fuel cells (DMFCs). Here, we have designed a novel multi-component nanoporous alloy electrocatalyst, and further modified its electrocatalytic performance through a controllable dealloying strategy. The quaternary nanoporous PtPdCuAl (np-PtPdCuAl) alloys have been successfully fabricated by dealloying mechanically alloyed AlCuPdPt precursor. Well control of one-step or two-step dealloying allows to tune the compositions and electrocatalytic activities of the np-PtPdCuAl alloys (designated as T1–T6 alloys). The np-PtPdCuAl alloys obtained through two-step dealloying show much enhanced electrocatalytic properties towards methanol electro-oxidation reaction (MOR) and oxygen reduction reaction (ORR) in comparison to the commercial benchmark Pt/C catalyst. Moreover, the np-PtPdCuAl alloy with the best MOR and ORR properties as well as excellent CO tolerance could be obtained by firstly dealloying in the 2 M NaOH solution and then in the 1 M HNO3solution (T3 alloy). This facile synthesis and easy control route is promising for the development of high performance electrocatalysts in DMFCs, and can be extended to fabricate other multi-component Pt-based catalysts with enhanced activities.
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