铂钌铱纳米颗粒结晶度对电催化甲醇氧化的影响

The Effect of PtRuIr Nanoparticle Crystallinity in Electrocatalytic Methanol Oxidation.

作者信息

Ma Yanjiao, Wang Rongfang, Wang Hui, Liao Shijun, Key Julian, Linkov Vladimir, Ji Shan

机构信息

Key Laboratory of Eco-Environment-Related Polymer Materials of Ministry of Education of China, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China.

Key Laboratory of Fuel Cell Technology of Guangdong Province, South China University of Technology, Guangdong, Guangzhou 510640, China.

出版信息

Materials (Basel). 2013 Apr 29;6(5):1621-1631. doi: 10.3390/ma6051621.

DOI:10.3390/ma6051621

PMID:28809233

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5452513/

Abstract

Two structural forms of a ternary alloy PtRuIr/C catalyst, one amorphous and one highly crystalline, were synthesized and compared to determine the effect of their respective structures on their activity and stability as anodic catalysts in methanol oxidation. Characterization techniques included TEM, XRD, and EDX. Electrochemical analysis using a glassy carbon disk electrode for cyclic voltammogram and chronoamperometry were tested in a solution of 0.5 mol L CH₃OH and 0.5 mol L H₂SO₄. Amorphous PtRuIr/C catalyst was found to have a larger electrochemical surface area, while the crystalline PtRuIr/C catalyst had both a higher activity in methanol oxidation and increased CO poisoning rate. Crystallinity of the active alloy nanoparticles has a big impact on both methanol oxidation activity and in the CO poisoning rate.

摘要

合成并比较了三元合金PtRuIr/C催化剂的两种结构形式，一种为非晶态，另一种为高度结晶态，以确定它们各自的结构对其作为甲醇氧化阳极催化剂的活性和稳定性的影响。表征技术包括透射电子显微镜（TEM）、X射线衍射（XRD）和能量散射X射线光谱（EDX）。使用玻碳圆盘电极进行循环伏安法和计时电流法的电化学分析在0.5 mol/L CH₃OH和0.5 mol/L H₂SO₄溶液中进行测试。发现非晶态PtRuIr/C催化剂具有更大的电化学表面积，而结晶态PtRuIr/C催化剂在甲醇氧化中具有更高的活性且一氧化碳中毒速率增加。活性合金纳米颗粒的结晶度对甲醇氧化活性和一氧化碳中毒速率都有很大影响。