Multi-component nanoporous platinum-ruthenium-copper-osmium-iridium alloy with enhanced electrocatalytic activity towards methanol oxidation and oxygen reduction
Multi-component nanoporous platinum-ruthenium-copper-osmium-iridium alloy with enhanced electrocatalytic activity towards methanol oxidation and oxygen reduction
复制标题
多组分纳米孔铂钌铜锇铱合金，对甲醇氧化和氧还原具有增强的电催化活性
DOI：
10.1016/j.jpowsour.2014.09.076
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发表时间：
2015-01-01
影响因子：
9.2
通讯作者：
Zhang, Zhonghua
中科院分区：
文献类型：
--
作者：
Chen, Xiaoting;Si, Conghui;Zhang, Zhonghua
通过机械合金化AlCuPtRuOsIr前驱体的化学脱合金化，制备了多组分纳米孔铂-Ru-铜-Os-Ir(NP-PtRuCuOsIr)电催化剂。NP-PtRuCuOsIr催化剂呈现典型的三维双连续互穿韧带/沟道结构，其长度尺度接近2.5 nm。Np-PtRuCuOsIr催化剂对甲醇氧化的质量活性(857.5 mA mg(Pt)-1)和比活性(3.0mA cm-2)均高于商用催化剂(分别为229.5 mA mg(Pt)-1和0.5mA cm(-2))。此外，NP-PtRuCuOsIr的CO溶出峰为0.54V(vs.SCE)，与商用PTC(0.67V vs.SCE)相比，负移130 mV。NP-PtRuCuOsIr的半波电位为0.900 V比RHE，与商品化的PtPtRuCuOsIr(0.864 V比RHE)相比为正36 mV。NP-PtRuCuOsIr催化剂的氧还原质量和比活性分别是商用PTC的1.8倍和3.8倍。此外，Np-PtRuCuOsIr合金在15K循环后仍表现出优异的氧还原活性，表明其具有良好的长期稳定性。Np-PtRuCuOsIr有望成为直接甲醇燃料电池(DMFC)电催化剂的候选材料。(C)2014爱思唯尔B.V.保留所有权利。
Multi-component nanoporous platinum-ruthenium-copper-osmium-iridium (np-PtRuCuOsIr) electro-catalyst 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 similar to 2.5 nm. The np-PtRuCuOsIr catalyst reaches a higher level in the mass activity (857.5 mA mg(pt)(-1)) and specific activity (3.0 mA cm(-2)) towards methanol oxidation compared to the commercial PtC catalyst (229.5 mA mg(pt)(-1) and 0.5 mA cm(-2) respectively). Moreover, the CO stripping peak of np-PtRuCuOsIr is 0.54 V (vs. SCE), 130 mV negative shift in comparison with the commercial PtC (0.67 V vs. SCE). The half-wave potential of np-PtRuCuOsIr is 0.900 V vs. RHE, 36 mV positive compared with that of the commercial PtC (0.864 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 15 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). (C) 2014 Elsevier B.V. All rights reserved.