Pt supported self-assembled nest-like-porous WO3 hierarchical microspheres as electrocatalyst for methanol oxidation
Pt supported self-assembled nest-like-porous WO3 hierarchical microspheres as electrocatalyst for methanol oxidation
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DOI：
10.1016/j.electacta.2012.10.060
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发表时间：
2013-01
影响因子：
6.6
通讯作者：
Jing Zhang;J. Tu;G. Du;Zimin Dong;Qingmei Su;D. Xie;Xiuli Wang
中科院分区：
文献类型：
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作者：
Jing Zhang;J. Tu;G. Du;Zimin Dong;Qingmei Su;D. Xie;Xiuli Wang
采用水热法合成了具有巢状孔结构的六方三氧化钨（hex-WO 3）分级微球。巢状多孔（NLP）WO 3分级微球由单晶纳米线自组装而成，直径为5-6μm。纳米线的长度为数百纳米，直径为5- 30纳米，纳米线的长轴取向为0.001纳米。Hex-WO 3微球的比表面积为62 m2 g-1。20重量%采用微波辅助乙二醇（EG）法在WO 3微球上负载了直径约为7 nm的Pt纳米粒子。采用循环伏安法和计时电流法研究了Pt/NLP-WO 3微球对甲醇氧化的电催化活性。由于六方结构的大孔道和高多孔表面形貌，实现了电化学性能的极大增强。Pt/NLP-WO 3微球是一种很有前途的直接甲醇燃料电池（DMFC）阳极材料。
Hexagonal tungsten trioxide (hex-WO3) hierarchical microspheres with nest-like pores are synthesized by a facile hydrothermal method. The nest-like-porous (NLP) WO3hierarchical microspheres with 5–6μm in diameters are self-assembled of single-crystal nanowires. The nanowires have lengths of several hundred nanometers and diameters of 5–30nm; the long axis of nanowire is oriented toward 〈001〉 direction. The specific surface area of hex-WO3microspheres is 62m2g−1. 20wt.% Pt nanoparticles with ∼7nm are loaded onto the WO3microspheres using a conventional microwave-assisted ethylene glycol (EG) method. The electrocatalytic activity for methanol oxidation of Pt/NLP-WO3microspheres is investigated by cyclic voltammetry and chronoamperometry. Due to the large tunnels of hexagonal structure and high porous surface morphology, great enhancement of electrochemical performance is achieved. The Pt/NLP-WO3microspheres are demonstrated to be a promising anode material for direct methanol fuel cells (DMFC).