Engineering active sites on hierarchical transition bimetal oxides/sulfides heterostructure array enabling robust overall water splitting

Panlong Zhai, Yanxue Zhang, Yunzhen Wu, Junfeng Gao, Bo Zhang, Shuyan Cao, Yanting Zhang, Zhuwei Li, Licheng Sun and Jungang Hou ()
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Panlong Zhai: School of Chemical Engineering, Dalian University of Technology
Yanxue Zhang: Ion and Electron Beams, Dalian University of Technology, Ministry of Education
Yunzhen Wu: School of Chemical Engineering, Dalian University of Technology
Junfeng Gao: Ion and Electron Beams, Dalian University of Technology, Ministry of Education
Bo Zhang: School of Chemical Engineering, Dalian University of Technology
Shuyan Cao: School of Chemical Engineering, Dalian University of Technology
Yanting Zhang: School of Chemical Engineering, Dalian University of Technology
Zhuwei Li: School of Chemical Engineering, Dalian University of Technology
Licheng Sun: School of Chemical Engineering, Dalian University of Technology
Jungang Hou: School of Chemical Engineering, Dalian University of Technology

Nature Communications, 2020, vol. 11, issue 1, 1-12

Abstract: Abstract Rational design of the catalysts is impressive for sustainable energy conversion. However, there is a grand challenge to engineer active sites at the interface. Herein, hierarchical transition bimetal oxides/sulfides heterostructure arrays interacting two-dimensional MoOx/MoS2 nanosheets attached to one-dimensional NiOx/Ni3S2 nanorods were fabricated by oxidation/hydrogenation-induced surface reconfiguration strategy. The NiMoOx/NiMoS heterostructure array exhibits the overpotentials of 38 mV for hydrogen evolution and 186 mV for oxygen evolution at 10 mA cm−2, even surviving at a large current density of 500 mA cm−2 with long-term stability. Due to optimized adsorption energies and accelerated water splitting kinetics by theory calculations, the assembled two-electrode cell delivers the industrially relevant current densities of 500 and 1000 mA cm−2 at record low cell voltages of 1.60 and 1.66 V with excellent durability. This research provides a promising avenue to enhance the electrocatalytic performance of the catalysts by engineering interfacial active sites toward large-scale water splitting.

Date: 2020
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DOI: 10.1038/s41467-020-19214-w

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