Abstract
Replacing precious metals with low-cost metals is the best solution for large scale production. Copper is known for its excellent conductivity and thermal management applications. When it comes to hydrogen evolution reaction, it is highly unstable, especially in KOH solution. In this paper, we approached a simple method to reduce corrosion and improve the performance by depositing nickel-molybdenum oxide and nickel on copper substrates and the achieved tafel slopes of 115 mV/dec and 117 mV/dec at 10 mA/cm2. While at first, molybdenum oxide coated samples showed better performance after 100 cycles of stability tests, the onset potential rapidly changed. Cu-Ni, which was deposited using the electron gun evaporation (e-gun), has shown better performance with 0.28 V at 10 mA/cm2 and led to stability after 100 cycles. Our results show that when copper is alloyed with nickel, it acts as a promising hydrogen evolution reaction (HER) catalyst.
Highlights
A Nickel Coated Copper Substrate as a HydrogenInternational College of Semiconductor Technology, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
Water electrolysis is one of the best alternative methods to solve future energy storage problems in green industries [1]
The preceding reports inspired us to investigate the influence of Ni and Ni-MoO3 on copper foil, and we present a simple method to reduce fabrication costs by using electron gun evaporation (e-gun), and the prepared samples have shown higher catalytic activity for hydrogen evolution reaction (HER) application than oxygen evolution reactions (OER)
Summary
International College of Semiconductor Technology, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
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