期刊
MATERIALS TODAY CHEMISTRY
卷 24, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.mtchem.2022.100994
关键词
Heterostructure catalyst; Electrodeposition; Electrochemical activation; Hydrogen production; Anion exchange membrane water electrolyzer
资金
- National Research Foundation of Korea (NRF) - Korean Ministry of Science and ICT [2021R1A2C2093358, 2021R1A4A3027878]
- Chung-Ang University
- National Research Foundation of Korea [2021R1A2C2093358] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study proposes a facile method of fabricating a Ni@Ni(OH)2 heterostructure catalyst on a Ti paper substrate, which significantly increases the exposed surface area and improves the activity of the hydrogen evolution reaction.
Efficient and cost-effective catalysts are vital for sustainable hydrogen production via water electrolysis. In this study, we propose a facile method of fabricating a Ni@Ni(OH)(2) heterostructure catalyst on a Ti paper substrate by combining electrodeposition and subsequent electrochemical activation. Detailed characterization and analysis revealed the formation of Ni (oxy)hydroxides. Ni@Ni(OH)(2) underwent surface reconstruction, resulting in the formation of abundant heterojunctions and electron modulation during electrochemical activation, which substantially increased the exposed surface area facilitating the adsorption of intermediates during the hydrogen evolution reaction (HER). Thus, the resulting activated Ni@Ni(OH)(2)/Ti electrode exhibited significantly improved HER activity in the half-cell test, reaching a current density of -10 mA/cm(2) at an overpotential of 58 mV with a Tafel slope of 83 mV/dec. When applied to anion exchange membrane water electrolysis, a single cell comprising an Ni@Ni(OH)(2/)Ti cathode and commercial IrO2/CP anode exhibited a maximum current density of 1.00 A/cm(2) at a potential of 2.0 V-cell, demonstrating superior performance to commercial Pt/C electrodes in the high-current-density region above 2.0 A/cm(2). (C) 2022 Elsevier Ltd. All rights reserved.
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