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电化学(中英文) ›› 2009, Vol. 15 ›› Issue (4): 371-376.  doi: 10.61558/2993-074X.2010

• 研究论文 • 上一篇    下一篇

表面富Pd的Ni-Pd/C催化剂的合成及电化学性质研究

陈玉梅;梁志修;陈胜利;   

  1. 武汉大学湖北省化学电源重点实验室化学与分子科学学院;河南理工大学物理化学学院;
  • 收稿日期:2009-11-28 修回日期:2009-11-28 出版日期:2009-11-28 发布日期:2009-11-28

Synthesis and Electrocatalytic Properties of Ni-Pd/C Catalysts with Pd-enriched Surface

CHEN Yu-mei1,2,LIANG Zhi-xiu1,CHEN Sheng-li1*   

  1. (1.Hubei Electrochemical Power Sources Key Laboratory,College of Chemistry and Molecular Science,Wuhan University,Wuhan 430072,China;2.College of Physics and Chemistry,Henan Polytechnic University,Jiaozuo 454000,Henan,China
  • Received:2009-11-28 Revised:2009-11-28 Published:2009-11-28 Online:2009-11-28

摘要: 应用改进的多元醇法,分步还原制备表面富Pd的N iPd双元合金催化剂.研究表明:由于Pd较容易还原成核,且与N i的合金化程度低,Pd难以在N i颗粒表面实现单层包覆形成N i@Pd核壳结构,而是近似以单相的低合金化形式存在于N i颗粒表面,即形成N i@Pd(N i)的结构.与Pd/C相比,制备的N i@Pd(N i)/C催化剂,其Pd表面的氢吸附峰与吸收峰分辨清晰,含氧化物的脱附峰向正电势移动,氧还原活性显著提高.另外,N i的存在使Pd的抗甲醇性能明显增强,从而有望作为直接甲醇燃料电池的阴极催化剂.

关键词: NiPd合金, 核壳结构, 氧还原, 电催化

Abstract: The Ni-Pd alloy catalysts with Pd-enriched surface were synthesized through a modified polyol process.The synthesized materials were investigated by XRD and electrochemical methods,and tested as electrocatalysts for CH3OH-tolerant oxygen reduction.The results indicated that the synthesized Ni-Pd nanoparticles possess multiple phases containing Pd-Ni alloy and pure Ni.Comparing with Pd/C,the prepared Ni-Pd/C nanoparticles exhibited better resolved voltammetric peaks between the hydrogen absorption and adsorption,and positively shifted current peaks for the reduction of Pd oxide.The prepared Ni-Pd alloys with Pd-enriched surface have significantly enhanced ORR activity and improved CH3OH tolerance as comparing with Pd/C catalysts.

Key words: NiPd alloy, core-shell nanoparticles, oxygen reduction reaction, electocatalysis

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