热处理对甲醇氧化催化剂Nb2O5·nH2O-Pt/C的影响

Effects of Heat Treatment on Nb2O5·nH2O-Pt/C Electrocatalyst for Methanol Electro-oxidation

摘要:

采用沉淀法制备甲醇氧化电催化剂10%Nb2O5·nH2O-20%Pt/C，并在Ar气氛下对它进行热处理。用XRD和HRTEM研究热处理对10%Nb2O5·nH2O-20%Pt/C结构和形貌的影响，用循环伏安法和计时电流法研究热处理对10%Nb2O5·nH2O-20%Pt/C电化学性能的影响。结果表明：随着热处理温度的升高，催化剂Pt尺寸增大、活性提高；与无热处理的20%Pt/C相比较，700 ℃热处理的10%Nb2O5·nH2O-20%Pt/C对甲醇的催化氧化性能最好，它对甲醇氧化的起始电位降低了150 mV，对甲醇的氧化峰电流提高了2.48倍

关键词:热处理;甲醇;电催化剂;Nb2O5·nH2O-Pt/C

Abstract:

10%Nb2O5·nH2O-20%Pt/C electrocatalyst for methanol oxidation was prepared by a deposition method, and it was heat treated in Ar atmosphere. The effects of heat treatment on morphology, microstructure and electrochemical performances were characterized by XRD, HRTEM, cyclic voltammetry and chronoamperograms. The results show that with the increase of heat-treatment temperature, the size of Pt particles is increased, and the catalytic performance becomes higher. In comparison with the 20%Pt/C without heat treatment, the catalytic performance of 10%Nb2O5·nH2O-20%Pt/C with heat treatment at 700 oC for methanol oxidation is best. Its initial potential of methanol oxidation is reduced by 150 mV, and the peak current for methanol oxidation is increased by 2.48 times

Key words:heat treatment; methanol; electrocatalyst; Nb2O5·nH2O-Pt/C