期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 46, 期 43, 页码 22463-22477出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2021.04.071
关键词
Ternary hydroxides; Layered double hydroxide; Oxygen evolution reaction; Hydrogen evolution reaction; Water electrolysis
资金
- Human Resources Program in Energy Technology of the Korea Institute of Energy Technology Evaluation and Planning from the Ministry of Trade, Industry AMP
- Energy, Republic of Korea [20204010600100]
- Basic Science Research Program through the National Research Foundation of Korea - Ministry of Education, Republic of Korea [NRF-2019R1I1A3A01046928]
3D hierarchical ternary NiCoMo-layered double hydroxide (NiCoMo-LDH) spheres were fabricated via a one-pot hydrothermal method and showed high efficiency as electrocatalysts for the OER and HER. The NiCoMo-LDH exhibited remarkable electrocatalytic activity for overall water splitting with long-term stability, making it a promising candidate for use in industrial applications such as rechargeable metal-air batteries.
Flowers-like 3D hierarchical ternary NiCoMo-layered double hydroxide (NiCoMo-LDH) spheres have been fabricated in substrate-free route via a one-pot hydrothermal method and utilized as efficient electrocatalysts for the OER and HER. The well-structured 3D hierarchical flowers were composed of numerous two-dimensional nanosheets, which inherently possess considerable electrochemical active sites, thereby enhancing catalytic activity. NiMo and CoMo binary LDHs, with similar morphology, were also prepared to illustrate the efficiency of the ternary LDH. The results indicate higher electrocatalytic activity for the ternary LDH as compared to binary LDHs under alkaline conditions. The NiCoMo-LDH required an overpotential as low as 202 and 93 mV to deliver a constant anodic and cathodic current density of 10 mA cm(-2) for the OER and HER, respectively. Furthermore, the NiCoMo-LDH exhibited remarkable HER activity, affording a low over potential of 198 mV at a current density of -100 mA cm(-2). Moreover, it could offer a stable current density of 10 mA cm(-2) for overall water splitting at 1.62 V in 1 M KOH with long-term stability for 20 h. The double-layer capacitance (C-dl) value indicated that the NiCoMo-LDH significantly influenced interface conductivity and the electrochemical active surface area. The ternary NiCoMo-LDH electrode yielded low Tafel slope values of 54 and 51 mVdec(-1) for the OER and HER. Owing to the efficient incorporation of Ni, Co, and Mo in a layered structure, synergetic effect, and high electrochemical surface area, the NiCoMoLDH exhibited remarkable electrocatalytic activity. Such eco-friendly ternary LDHs can be used in rechargeable metal-air batteries for industrial applications. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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