期刊
ELECTROCHIMICA ACTA
卷 386, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2021.138458
关键词
Alkaline water electrolysis; Raney Ni; DC and RF sputtering; Hydrogen evolution reaction; Full cell test station
资金
- Hydrogen Energy Innovation Technology Development Program of the National Research Foundation (NRF) of Korea - Ministry of Science and ICT [NRF-2019M3E6A1064020, 2019M3E6A1064699]
- Soonchunhyang University Research Fund
- National Research Foundation of Korea [2019M3E6A1064699] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
In this study, Ni electrodes were prepared using various methods for alkaline water electrolysis. The DC-sputtered Ni electrode showed the best electrochemical performance, with the lowest overpotential and Tafel slope, indicating the fastest charge transfer reaction in the HER process. Single-cell tests also confirmed its highly stable electrochemical activity under harsh operational conditions, opening up new possibilities for CO2-free, cost-effective, and scalable hydrogen production for industrial applications.
Hydrogen is regarded as a highly clean and renewable future energy resource. Water electrolysis (WE) is the most promising technology to produce hydrogen at large scale without carbon dioxide generation. In this study, we prepared Ni electrodes for alkaline water electrolysis purpose using various methods, including direct sputtering (DC and RF operational modes) and the Raney Ni process, and investigated their morphologies and electrochemical activities in the hydrogen evolution reaction (HER). The DC-sputtered Ni electrode showed well-controlled surface morphology with around 40-fold roughness enhancement, compared to the Ni substrate. Half-cell HER test showed that DC-sputtered Ni electrode provides the best electrochemical performance, including the lowest overpotential of 100 mV at a current density of 50 mA/cm(2), and provides the lowest Tafel slope, representing the fastest charge transfer reaction and kinetics of HER. More importantly, for practical application purposes, single-cell test was also conducted to confirm the on/off durability and long-term stability, which showed highly stable electrochemical activity under harsh operational conditions. We expect that our approach will launch a new trajectory for realizing CO2-free, cost-effective, and scalable hydrogen production for industrial application purpose, even in combination with renewable power sources, including solar, wind, and hydro energy. (C) 2021 Elsevier Ltd. All rights reserved.
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