Journal
SCIENCE CHINA-MATERIALS
Volume 65, Issue 5, Pages 1225-1236Publisher
SCIENCE PRESS
DOI: 10.1007/s40843-021-1894-4
Keywords
heterojunction; modulating electronic structure; electrocatalytic hydrogen evolution; metal phosphides; polyoxometalates
Categories
Funding
- National Key R&D Program of China [2018YFB1502401]
- National Natural Science Foundation of China [91961111, 22171074, 21601055, U20A20250, 21805073, 22005161]
- Natural Science Foundation of Heilongjiang Province [ZD2021B003]
- China Postdoctoral Science Foundation [2017M611406]
- Postdoctoral Science Foundation of Heilongjiang Province [LBH-Z16175]
- Scientific Research Funds of University Affiliated to Heilongjiang Province [KJCX201913]
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Multi-interface engineering is an effective strategy to boost catalytic activity, but it is challenging due to phase separation. In this study, CoP-WP heterojunctions with multi-touch interfaces were designed using Co8W18 as a precursor. The CoP-WP/rGO catalyst exhibited remarkable hydrogen evolution reaction (HER) activity and long-term durability.
Multi-interface engineering is deemed as an effective strategy to boost catalytic activity via electronic structure modulation. However, it is still a big challenge due to the phase-separation tendency. Herein, we designed CoP-WP heterojunctions with multi-touch interfaces using Co8W18, a definite structure polyoxometalate-based polynuclear cobalt molecular cluster, as a precursor. The CoP-WP heterojunctions anchored on reduced graphene oxide (CoP-WP/rGO) were obtained by growing Co8W18 on GO followed by phosphorization. The intrinsic {Co-O-W} coordination modes in Co8W18 are conducive to the formation of the multiple interfaces between CoP and WP. The abundant intimate interfaces in CoP-WP heterojunctions promote the electron transfer from WP to CoP, thus regulating the interfacial electronic structure and optimizing the hydrogen adsorption free energy (Delta G(H*)), as verified by X-ray photoelectron spectroscopy analysis and theoretical calculations. Furthermore, the integration of rGO provides CoP-WP/rGO with a large surface area and high conductivity, aiding mass transport and charge transfer. CoP-WP/rGO exhibits remarkable hydrogen evolution reaction (HER) activity with low overpotentials of 96, 130, and 138 mV at 10 mA cm(-2) in alkaline, acidic and neutral media, respectively, and has long-term durability. Our discovery provides an opportunity to design heterojunction materials with multi-coupled interfaces at low-cost and efficient HER catalysts.
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