期刊
SMALL
卷 14, 期 16, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201704073
关键词
bifunctional promoters; electrocatalysts; nickel oxide; ruthenium dioxide; water splitting
类别
资金
- Australian Research Council (ARC) [DP160104866, DP170104464, LP160100927, FL170100154]
- National Natural Science Foundation of China [21576202]
Conventional development of nanomaterials for efficient electrocatalysis is largely based on performance-oriented trial-and-error/iterative approaches, while a rational design approach at the atomic/molecular level is yet to be found. Here, inspired by a fundamental understanding of the mechanism for both oxygen and hydrogen evolution half reactions (OER/HER), a unique strategy is presented to engineer RuO2 for superior alkaline water electrolysis through coupling with NiO as an efficient bifunctional promoter. Benefitting from desired potential-induced interfacial synergies, NiO-derived NiOOH improves the oxygen binding energy of RuO2 for enhanced OER, and NiO also promotes water dissociation for enhanced HER on RuO2-derived Ru. The resulting hybrid material exhibits remarkable bifunctional activities, affording 2.6 times higher OER activity than that of RuO2 and an HER activity comparable to Pt/C. As a result, the simple system requires only 1.5 V to deliver 10 mA cm(-2) for overall alkaline water splitting, outperforming the benchmark PtC/NF parallel to IrO2/NF couple with high mass loading. Comprehensive electrochemical investigation reveals the unique and critical role of NiO on the optimized RuO2/NiO interface for synergistically enhanced activities, which may be extended to broader (electro)catalytic systems.
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