Electrocatalysis of Pd-Co supported on carbon black or ball-milled carbon nanotubes towards methanol oxidation in alkaline media
Electrocatalysis of Pd-Co supported on carbon black or ball-milled carbon nanotubes towards methanol oxidation in alkaline media
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DOI：
10.1016/j.apcatb.2010.06.024
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发表时间：
2010-08-31
影响因子：
22.1
通讯作者：
Li, Chang Ming
中科院分区：
文献类型：
--
作者：
Wang, Yi;Wang, Xin;Li, Chang Ming
通过与硼氢化钠在水溶液中的简单同时还原反应，制备了Pd/C和Pd-Co/C催化剂，并考察了其在碱性溶液中对甲醇氧化的电催化性能。用X射线衍射仪(XRD)、能谱仪(EDX)和透射电子显微镜(TEM)对催化剂的结构和形貌进行了表征。循环伏安(CV)和CO溶出结果表明，Pd-Co(8：1)/C比Pd/C具有更好的电催化活性和更高的抗CO中毒能力，这可以用双功能机理解释。基于Pd-Co(8：1)/C良好的电催化性能，合成了球磨碳纳米管负载Pd-Co(8：1)催化剂，表现出更好的催化活性。具有大量介孔和缺陷的球磨碳纳米管具有较高的比表面积，这可能有助于提高Pd-Co的利用率，从而获得更好的电催化活性。(C)2010爱思唯尔B.V.保留所有权利。
Pd/C and Pd-Co/C catalysts were synthesized through a simple simultaneous reduction reaction with sodium borohydride in aqueous solution, and the electrocatalytic performance for methanol oxidation in alkaline solutions was investigated. The structure and morphology of these catalysts were characterized by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX) and transmission electron microscopy (TEM). The cyclic voltammetry (CV) and CO stripping results show that Pd-Co(8:1)/C has better electrocatalytic activity and higher resistance to CO poisoning over Pd/C, which can be explained by a bifunctional mechanism. Based on the good electrocatalytic performance of Pd-Co(8:1)/C, the ball-milled CNTs-supported Pd-Co(8:1) catalyst was synthesized, demonstrating even better catalytic activity. The high specific surface area of ball-milled CNTs with plenty of mesopores and defects may contribute to the high Pd-Co utilization and consequently to the better electrocatalytic activity. (C) 2010 Elsevier B.V. All rights reserved.