高性能PtNi合金催化剂构筑及其对甲醇电催化

Construction of high-performance PtNi alloy catalyst and its electrocatalysis of methanol

摘要:

以多壁碳纳米管（CNTs）为载体，H2PtCl6·6H2O为铂源、Ni(NO3)2·6H2O为镍源，硼氢化钠和乙二醇为还原剂，采用一锅法制备了一种PtNi/CNTs合金电催化剂。采用XRD、SEM、TEM、HR-TEM、XPS、ICP-OES和Raman对催化剂结构进行表征。采用循环伏安法（CV）、计时安培法（i-t）和CO溶出曲线法评价了催化剂的电化学活性与稳定性。结果表明，PtNi/CNTs对甲醇电催化氧化（MOR）反应具有优异的电催化性能，峰值电流和稳态电流分别是商业Pt/C的5.89倍和38.97倍，同时，PtNi/CNTs还表现出良好的稳定性，主要归因于碳纳米管独特的结构与双金属合金的协同效应。

Abstract:

A PtNi/CNTs alloy electrocatalyst was prepared by one-pot method using multi-walled carbon nanotubes (CNTs) as the carrier, H2PtCl6·6H2O as the platinum source, Ni(NO3)2·6H2O as the nickel source, sodium borohydride and ethylene glycol as reducing agents. The catalyst was structurally characterized by XRD, SEM, TEM, HR-TEM, XPS, ICP-OES and Raman. The electrochemical activity and stability of the catalyst were evaluated by cyclic voltammetry (CV), time-amperometric method (i-t) and CO-stripping method. The results show that PtNi/CNTs have excellent electrocatalytic properties for methanol oxidation (MOR), and the peak current and steady-state current are 5.89 times and 38.97 times than that of commercial Pt/C, respectively, and PtNi/CNTs also show good stability, mainly due to the unique structure of carbon nanotubes and the synergistic effect of bimetallic alloys.