Construction of Ni(CN)<sub>2</sub> /NiSe<sub>2</sub> Heterostructures by Stepwise Topochemical Pathways for Efficient Electrocatalytic Oxygen Evolution.
basic_science · Level V
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- Record sourced from PubMed, PMID 34726305.
- Also identified by DOI 10.1002/adma.202104405.
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Abstract
Exploiting effective electrocatalysts based on elaborate heterostructures for the oxygen evolution reaction (OER) has been considered as a promising strategy for boosting water splitting efficiency to produce the clean energy-hydrogen. However, constructing catalytically active heterostructures with novel composition and architecture remains poorly developed due to the synthetic challenge. In this work, it is demonstrated that unique Ni(CN)<sub>2</sub> /NiSe<sub>2</sub> heterostructures, composed of single-crystalline Ni(CN)<sub>2</sub> nanoplates surrounded by crystallographically aligned NiSe<sub>2</sub> nanosatellites, can be created from nickel-based Hofmann-type coordination polymers through stepwise topochemical pathways. When employed as the OER electrocatalyst, the Ni(CN)<sub>2</sub> /NiSe<sub>2</sub> heterostructures show enhanced performance, which could be attributed to optimized geometric and electronic structures of the catalytic sites endowed by the synergy between the two components. This work demonstrates a rational synthetic route for creating a novel Ni-based OER electrocatalyst that possesses nanoscale heterostructure, whose composition, spatial organization, and interface configuration can be finely manipulated.