配位自还原法制备纳米银及其电催化活性

doi:10.3724/SP.J.1095.2014.40040

摘要/Abstract

摘要： Pt是质子交换膜燃料电池(PEMFC)阴极氧还原最好的催化剂，但价格昂贵，且易被渗透到阴极的燃料分子及中间体毒化，导致电池性能降低。本文以乙二胺四甲叉膦酸(EDTMP)为配位剂和还原剂，采用配位自还原法快速合成银纳米粒子(Ag NPs)，并研究了其对氧还原的电催化性能。透射电子显微镜(TEM)、X射线衍射(XRD)等测试结果表明，Ag NPs分散性好且粒径均一，还原反应6 h所得Ag NPs的平均粒径约6 nm；循环伏安法(CV)等电化学测试发现，在碱性条件下此种合成方法制得的银作为电催化氧还原反应(ORR)的催化剂具有良好的催化活性，通过EDTMP配位自还原得到的Ag NPs对氧还原的半波电位(E1/2)比传统的NaBH4直接还原所制得Ag NPs的E1/2正移60 mV。

关键词: 质子交换膜燃料电池, 氧还原, 银纳米粒子, 乙二胺四甲叉膦酸

Abstract: Pt is the best electrocatalyst for the oxygen reduction reactions(ORR). However, there are several major drawbacks, such as high cost and intolerance to the presence of intermediate species. In this paper, we use ethylene diamine tetramethylene phosphonic acid(EDTMP) as complexing-reducing agent to synthesize Ag nanoparticles. The silver nanoparticles obtained after 6 h of reduction reaction and characterized by X-ray diffraction(XRD) and transmission electron microscopy(TEM), show uniform dispersion with the particle size about 6 nm. The electrochemical tests indicated that the Ag nanoparticles exhibit superior ORR activity under alkaline conditions than that of Ag nanoparticles prepared by the conventional NaBH4 reduction. The half-wave potential(E1/2) of ORR for previous catalysis has a positive shift of 60 mV.

Key words: proton exchange membrane fuel cell, oxygen reduction, silver nanoparticle, ethylene diamine tetramethylene phosphonic acid

中图分类号:

O646

马娟, 隋琪, 陆天虹. 配位自还原法制备纳米银及其电催化活性[J]. 应用化学, DOI: 10.3724/SP.J.1095.2014.40040.

MA Juan1,3, SUI Qi2, LU Tianhong2*. Complexing Self-reduction Synthesis of Silver Nanoparticles and Their Electrocatalytic Performance[J]. Chinese Journal of Applied Chemistry, DOI: 10.3724/SP.J.1095.2014.40040.

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