Preparation of Pt‐MoOx/CNT Electrode and Its Electrocatalytic Property for Ethanol Electrooxidation
Preparation of Pt‐MoOx/CNT Electrode and Its Electrocatalytic Property for Ethanol Electrooxidation
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DOI：
10.1002/cjoc.200690168
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发表时间：
2006-07
影响因子：
5.4
通讯作者：
Mingyong Wang;Jinhan Li;K. Cui
中科院分区：
文献类型：
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作者：
Mingyong Wang;Jinhan Li;K. Cui
将非贵金属副催化剂MoOx分散在碳纳米管（CNT）上，然后采用电位阶跃法将主催化剂Pt电沉积在MoOx/CNT/石墨电极上。所使用的CNT通过化学气相沉积直接生长在石墨盘上。通过扫描电子显微镜和能量色散X射线光谱对Pt-MoOx/CNT/石墨电极进行了表征。采用循环伏安法研究了Pt-MoOx/CNT/石墨电极在1.0mol/LCH 3CH 2 OH +0.1mol/LH 2SO 4溶液中对乙醇氧化的电催化性能和长期循环稳定性。另一方面，研究了MoOx负载量对Pt-MoOx/CNT/石墨电极比活性和乙醇氧化活化能的影响。Pt-MoOx/CNT/石墨电极显示出良好的长期循环稳定性。循环500次后，在0.69 V（vs. SCE）附近的氧化峰处的峰值电流密度保持在82%，高于Pt/CNT/石墨和Pt-Ru/CNT/石墨电极的相应值（分别为55%和72%）。
MoOx, a non-noble secondary catalyst instead of noble metal Ru, was dispersed on carbon nanotubes (CNT) and then the primary catalyst Pt was electrodeposited on MoOx/CNT/graphite electrode by potential-step method. CNT used was grown directly on graphite disk by chemical vapor deposition. The Pt-MoOx/CNT/graphite electrode was characterized by scanning electron microscopy and energy dispersive X-ray spectroscopy. The electrocatalytic property and the long-term cyclic stability of Pt-MoOx/CNT/graphite electrode for ethanol oxidation have been investigated in 1.0 mol/L CH3CH2OH+0.1 mol/L H2SO4 by cyclic voltammetry. On the other hand, the effect of the loading mass of MoOx on specific activity of Pt-MoOx/CNT/graphite electrode and the activation energy of ethanol oxidation were investigated. The Pt-MoOx/CNT/graphite electrode shows good long-term cyclic stability. 82% value of peak current density at the oxidation peak around 0.69 V (vs. SCE) remains after 500 cycles, which is higher than those of Pt/CNT/graphite and Pt-Ru/CNT/graphite electrodes with the corresponding values of 55% and 72%, respectively.