Electrochemical catalytic activities of nanoporous palladium rods for methanol electro-oxidation
Electrochemical catalytic activities of nanoporous palladium rods for methanol electro-oxidation
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纳米孔钯棒对甲醇电氧化的电化学催化活性
DOI：
10.1016/j.jpowsour.2010.03.098
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发表时间：
2010-10
期刊：
影响因子：
--
通讯作者：
Zhang, Zhonghua
中科院分区：
文献类型：
--
作者：
Wang, Xiaoguang;Wang, Weimin;Qi, Zhen;Zhao, Changchun;Ji, Hong;Zhang, Zhonghua
以Al_（80）Pd_（20）合金为原料，在5 wt.%的Pd_（20）溶液中脱合金，制备出纳米多孔钯（npPd）棒。HCl水溶液中自由腐蚀条件下。这些纳米多孔钯棒的微观结构，其特征在于使用扫描电子显微镜和透射电子显微镜。结果表明，每个Pd棒的长度为几微米，直径为几百纳米。此外，所有的棒显示出典型的三维双连续互穿韧带通道结构，长度尺度为15- 20 nm。电化学实验表明，这些独特的纳米多孔钯棒（与Vulcan XC-72碳粉混合形成npPd/C催化剂）显示出对甲醇在碱性介质中氧化的上级电催化性能。此外，催化剂的电催化活性与金属负载量有关，当金属负载量为0.4mgcm-2时，催化剂的电催化活性达到最高值（223.52mAmg-1）。此外，甲醇在npPd棒表面氧化时存在竞争吸附机制，电氧化反应为扩散控制的电化学过程.由于npPd棒具有制备简单、批量生产效率高等优点，因此有望成为直接甲醇燃料电池（DMFC）阳极催化剂的候选材料。
A novel electrocatalyst, nanoporous palladium (npPd) rods can be facilely fabricated by dealloying a binary Al80Pd20alloy in a 5wt.% HCl aqueous solution under free corrosion conditions. The microstructure of these nanoporous palladium rods has been characterized using scanning electron microscopy and transmission electron microscopy. The results show that each Pd rod is several microns in length and several hundred nanometers in diameter. Moreover, all the rods exhibit a typical three-dimensional bicontinuous interpenetrating ligament-channel structure with length scale of 15–20nm. The electrochemical experiments demonstrate that these peculiar nanoporous palladium rods (mixed with Vulcan XC-72 carbon powders to form a npPd/C catalyst) reveal a superior electrocatalytic performance toward methanol oxidation in the alkaline media. In addition, the electrocatalytic activity obviously depends on the metal loading on the electrode and will reach to the highest level (223.52mAmg−1) when applying 0.4mgcm−2metal loading on the electrode. Moreover, a competing adsorption mechanism should exist when performing methanol oxidation on the surface of npPd rods, and the electro-oxidation reaction is a diffusion-controlled electrochemical process. Due to the advantages of simplicity and high efficiency in the mass production, the npPd rods can act as a promising candidate for the anode catalyst for direct methanol fuel cells (DMFCs).
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