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Enhanced Catalytic Performance of Bimetallic Nickel–Cobalt Loaded Low-Content Au Catalyst Toward Ethanol Electro-Oxidation

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Abstract

Low-content Au nanoparticles loaded over nickel–cobalt bimetallic nanoflakes on a FTO substrate electrode (Au/NiCo) were obtained by an electrodeposition-replacement precipitation method. The as-prepared catalysts were characterized by scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDS), and their catalytic performances for ethanol electro-oxidation were investigated by multi-cyclic voltammetry, current-time curve, Tafel curve, and electrochemical impedance spectroscopy (EIS). The result showed that Au/NiCo catalysts exhibited higher electrocatalytic activity toward ethanol electro-oxidation compared to Au nanoparticles loaded on nickel (Au/Ni) and cobalt (Au/Co), respectively, due to the enhanced anti-poisoning tolerance by Co, and the bifunctional effect of NiCo and Au. Moreover, the ratio of Ni and Co had a great effect on the activity of the nanocomposite catalyst; Au/Ni0.04 prepared from the electrolyte of 0.04 mol/L Ni(NO3)2 + 0.005 mol/L Co(NO3)2 showed the highest performance for ethanol electro-oxidation. The result from this work suggests a new route for rational design of low-cost and high-performance electrocatalysts in direct ethanol fuel cells.

Au/Ni0.04 with porous spherical flower-like structure showed higher electrocatalyitc activity toward ethanol electro-oxidation

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Acknowledgments

This work was partially supported by NSFC (21307038 and 21577046), Physical Chemistry Experiment Reform in Colleges and Universities (xfg2015c25), Key Project of Chinese Ministry of Education (212115), PSFC (2012M521482 and 2013T60754), and Outstanding Young Science and Technology Innovation Team Program of Hubei Provincial Universities (T201514).

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Authors and Affiliations

  1. Hubei Key Laboratory for Processing and Application of Catalytic Materials, Huanggang Normal University, Huanggang, 438000, People’s Republic of China

    Cheng Yu, Zhaoxiong Yan, Lihong Zhu, Juan Wen, Hongqiang Wang & Zhihua Xu

  2. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, People’s Republic of China

    Zhaoxiong Yan

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  1. Cheng Yu
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  2. Zhaoxiong Yan
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  3. Lihong Zhu
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  4. Juan Wen
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Correspondence to Zhaoxiong Yan or Zhihua Xu.

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Yu, C., Yan, Z., Zhu, L. et al. Enhanced Catalytic Performance of Bimetallic Nickel–Cobalt Loaded Low-Content Au Catalyst Toward Ethanol Electro-Oxidation. Electrocatalysis 7, 193–200 (2016). https://doi.org/10.1007/s12678-016-0303-4

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