材料科学
化学工程
碳纤维
析氧
塔菲尔方程
过电位
计时安培法
作者
Yan Zhang,Jianbing Zang,Shaopei Jia,Pengfei Tian,Chan Han,Yanhui Wang
标识
DOI:10.1016/j.apsusc.2017.03.284
摘要
Abstract Nickel and molybdenum carbide modified carbon black (Ni-MoC x /C) was synthesized by a two-step microwave-assisted deposition/carbonthermal reduction method and characterized by X-ray diffraction, transmission electron microscopy, energy dispersive spectroscopy and X-ray photoelectron spectroscopy. The as-prepared Ni-MoC x /C supported Pt (10 wt%) electrocatalyst (10Pt/Ni-MoC x /C) was synthesized through a microwave-assisted reduction method and 10Pt/Ni-MoC x /C exhibited high electrocatalytic activity for methanol oxidation, oxygen reduction and hydrogen evolution reactions. Results showed that 10Pt/Ni-MoC x /C electrocatalyst had better electrocatalytic activity and stability performance than 20 wt% Pt/C (20Pt/C) electrocatalyst. Among them, the electrochemical surface area of 10Pt/Ni-MoC x /C reached 68.4 m 2 g −1 , which was higher than that of 20Pt/C (63.2 m 2 g −1 ). The enhanced stability and activity of 10Pt/Ni-MoC x /C electrocatalyst were attributed to: (1) an anchoring effect of Ni and MoC x formed during carbonthermal reduction process; (2) a synergistic effect among Pt, Ni, MoO x and MoC x . These findings indicated that 10Pt/Ni-MoC x /C was a promising electrocatalyst for direct methanol fuel cells.
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