Encapsulated RuP 2 -RuS 2 nanoheterostructure with regulated interfacial charge redistribution for synergistically boosting hydrogen evolution electrocatalysis.
Ping LiWenqin LiYuqi HuangJixin LiQuhua HuangShien ZhaoShuanghong TianPublished in: Nanoscale (2022)
Exploring cost-effective electrocatalysts with suitable hydrogen binding strength and rational micro/nano-architecture towards the hydrogen evolution reaction (HER) is crucial for energy technologies, yet remains a tough challenge. Herein we present the first instance of a nanoscale RuP 2 -RuS 2 heterostructure encapsulated in N, P, and S co-doped porous carbon nanosheets (RuP 2 -RuS 2 /NPS-C) for boosting the HER. The synthesis involves the construction of a 2D core-shell structured precursor in which Ru 3+ -functionalized g-C 3 N 4 is wrapped by poly(cyclotriphosphazene- co -4,4'-sulfonyldiphenol) followed by pyrolysis. In this nanocomposite, the unique architecture with a highly dispersed embedded RuP 2 -RuS 2 nanoheterostructure guarantees not only full exposure of the active sites with enhanced robustness but also smooth mass/charge transfer. More significantly, the experimental results and theoretical calculations reveal that coupling RuP 2 with RuS 2 to construct a heterointerface can induce charge redistribution, giving rise to optimized hydrogen adsorption energy for substantially accelerating the HER. This work provides a novel strategy to engineer high-performance Ru-based electrocatalysts by elegantly modulating the micro-/nano-architecture and interface coupling effect.
Keyphrases
- quantum dots
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- energy transfer
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