期刊
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
卷 46, 期 11, 页码 14979-14993出版社
WILEY
DOI: 10.1002/er.8198
关键词
hydrogen evolution reaction; multi-valent iron oxide; nickel boride; ternary composite; water splitting kinetics
资金
- National Research Foundation of Korea [2020R1A4A4079954, 2021R1A6A1A03038858]
- Regional Innovation Strategy [2021RIS-003]
- National Research Foundation of Korea [2021R1A6A1A03038858, 2020R1A4A4079954] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
In this study, a ternary composite material was synthesized as an electrode material for water reduction under alkaline conditions. The study showed that the material has selective reactive sites, requires a significant overpotential to achieve the desired current density, and exhibits good reaction rate and stability.
The presence of multiple active sites and hetero-junction on a multi-component hetero-structured catalyst would exhibit modest hydrogen binding strength and charge transfer, as well as redistribution during interaction with the intermediates during the water reduction process. In this study, we synthesized a ternary iron oxide/nickel boride/graphitic carbon nitride (Fe3O4/NixB/g-CN) composite as the electrode material for the reduction of water under alkaline environment. Preformed NixB seed and Fe3O4 phases were codeposited on a g-CN layer. Post-catalytic characterization studies indicated facet selective reactive sites for NixB and Fe3O4 during the reduction of water. The composite required 130 mV overpotential for 10 mA cm(-2) current density. The Tafel slope value of 99 mV dec(-1) indicated that the adsorption step might determine the rate of reaction. The long-term chronoamperometric study showed almost unaltered current density over similar to 50 h at 150 mV, only similar to 7.0% current loss over 50 h. The reactivity and stability can be attributed to the synergistic interaction within metal centers and the carbon support with a large surface area.
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