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MnOxHy-modified CoMoP/NF nanosheet arrays as hydrogen evolution reaction and oxygen evolution reaction bifunctional catalysts under alkaline conditions.
- Source :
- Dalton Transactions: An International Journal of Inorganic Chemistry; 11/7/2023, Vol. 52 Issue 41, p15091-15100, 10p
- Publication Year :
- 2023
-
Abstract
- It is widely acknowledged that interface engineering strategies can significantly enhance the activity of catalysts. In this study, we developed a CoMoP nanoarray directly grown in situ on a nickel foam (NF) substrate, with the interface structure formed through the electrodeposition of MnO<subscript>x</subscript>H<subscript>y</subscript>. The resulting heterostructure MnO<subscript>x</subscript>H<subscript>y</subscript>/CoMoP/NF exhibited remarkable hydrogen evolution reaction (HER) activity, achieving overpotentials as low as 61 and 138 mV at 10 and 100 mA cm<superscript>−2</superscript>, respectively. Moreover, MnO<subscript>x</subscript>H<subscript>y</subscript>/CoMoP/NF demonstrated efficient oxygen evolution reaction (OER) activity with an overpotential of 330 mV at 100 mA cm<superscript>−2</superscript>. Remarkably, MnO<subscript>x</subscript>H<subscript>y</subscript>/CoMoP/NF maintained its catalytic properties and structural integrity even after working continuously for 20 h facilitating the HER at 10 mA cm<superscript>−2</superscript> and the OER at 100 mA cm<superscript>−2</superscript>. The Tafel slopes of the HER and OER were determined to be as small as 14 and 55 mV dec<superscript>−1</superscript>, respectively, confirming that the coupled interface conferred fast reaction kinetics on the catalyst. When applied in overall water splitting, MnO<subscript>x</subscript>H<subscript>y</subscript>/CoMoP/NF delivered a voltage of 1.91 V at 100 mA cm<superscript>−2</superscript> with excellent stability. This study demonstrated the feasibility of utilizing a simple electrodeposition technique to fabricate a heterogeneous structure with bifunctional catalytic activity, establishing a solid foundation for diverse industrial applications. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14779226
- Volume :
- 52
- Issue :
- 41
- Database :
- Complementary Index
- Journal :
- Dalton Transactions: An International Journal of Inorganic Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 173147082
- Full Text :
- https://doi.org/10.1039/d3dt02467a