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New Insights into the Electrocatalytic Mechanism of Methanol Oxidation on Amorphous Ni-B-Co Nanoparticles in Alkaline Media

1
Department of Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2
School of Science, North University of China, Taiyuan 030051, China
3
The State Key Laboratory of Hydroscience and Engineering of Tsinghua University, Beijing 100084, China
4
Sanjiangyuan Collaborative Innovation Center, Tsinghua University, Beijing 100084, China
*
Authors to whom correspondence should be addressed.
Catalysts 2019, 9(9), 749; https://doi.org/10.3390/catal9090749
Received: 18 August 2019 / Revised: 1 September 2019 / Accepted: 2 September 2019 / Published: 5 September 2019
(This article belongs to the Section Electrocatalysis)
Despite an increased interest in sustainable energy conversion systems, there have been limited studies investigating the electrocatalytic reaction mechanism of methanol oxidation on Ni-based amorphous materials in alkaline media. A thorough understanding of such mechanisms would aid in the development of amorphous catalytic materials for methanol oxidation reactions. In the present work, amorphous Ni-B and Ni-B-Co nanoparticles were prepared by a simple chemical reduction, and their electrocatalytic properties were investigated by cyclic voltammetry measurements. The diffusion coefficients (D0) for Ni-B, Ni-B-Co0.02, Ni-B-Co0.05, and Ni-B-Co0.1 nanoparticles were calculated to be 1.28 × 10−9, 2.35 × 10−9, 4.48 × 10−9 and 2.67 × 10−9 cm2 s−1, respectively. The reaction order of methanol in the studied transformation was approximately 0.5 for all studied catalysts, whereas the reaction order of the hydroxide ion was nearly 1. The activation energy (Ea) values of the reaction were also calculated for the Ni-B and Ni-B-Co nanoparticle systems. Based on our kinetic studies, a mechanism for the methanol oxidation reaction was proposed which involved formation of an electrocatalytic layer on the surface of amorphous Ni–B and Ni-B-Co nanoparticles. And methanol and hydroxide ions could diffuse freely through this three-dimensional porous conductive layer. View Full-Text
Keywords: methanol electrooxidation; amorphous Ni-B nanoparticle; cobalt doping; reaction mechanism; kinetics methanol electrooxidation; amorphous Ni-B nanoparticle; cobalt doping; reaction mechanism; kinetics
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MDPI and ACS Style

Wu, F.; Zhang, Z.; Zhang, F.; Duan, D.; Li, Y.; Wei, G.; Liu, S.; Yuan, Q.; Wang, E.; Hao, X. New Insights into the Electrocatalytic Mechanism of Methanol Oxidation on Amorphous Ni-B-Co Nanoparticles in Alkaline Media. Catalysts 2019, 9, 749.

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