Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 286, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2021.119909
Keywords
Multifunctional catalysis; Zn-air batteries; Water splitting; DFT calculations; Nickel-molybdenum oxyselenide nanosheets
Funding
- Basic Science Research Program through the National Research Foundation - Ministry of Science and ICT of Republic of Korea [2017R1A2B3004917]
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The development of 3D nickel molybdenum oxyselenide nanoarchitectures with numerous oxygen vacancies through a low-cost hydrothermal and selenium ion modulation approach has been shown to enhance catalytic activities and electrochemical performance. This strategy provides a general approach to explore efficient multifunctional catalysts with enhanced durability for applications such as flexible Zn-air batteries and water electrolyzers.
Rational design of 3D nickel molybdenum oxyselenide (Ni1-xMoxOSe) nanoarchitectures with numerous oxygen vacancies is developed through facile and low-cost hydrothermal and followed by selenium ion modulation approach. The experimental and theoretical studies reveal that the optimal Ni0.5Mo0.5OSe possesses ultrafast charge-transfer kinetics, which would boost the catalytic activities, enhance the accessibility of electroactive sites, and increase the diffusion networks for oxygen species. Most impressively, the optimal Ni0.5Mo0.5SSe affords superior trifunctional activities, outperforming benchmark Pt/C and IrO2 catalysts. When employed as an air-cathode in flexible Zn-air batteries, it achieves a peak power density of 166.7 mW cm(-2) and outstanding durability for 300 h in ambient air. Furthermore, the water electrolyzer realizes a current density of 10 mA cm(-2) at a cell voltage of 1.51 V, outperforming benchmark Pt/C parallel to IrO2 couple and reported state-of-the-art catalysts. This consequence provides a general strategy to explore highly efficient multifunctional catalysts with enhanced durability.
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