Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 38, Pages 42850-42858Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c11847
Keywords
water splitting; layered double hydroxide; plasma magnetron sputtering; heterojunctions; oxygen vacancies
Funding
- City University of Hong Kong Strategic Research Grant (SRG) [7005105]
- Hong Kong Research Grants Council (RGC) General Research Fund (GRF) [CityU 11205617]
- National Natural Science Foundation of China [51774261]
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The development of earth-abundant transition-metal-based electrocatalysts with bifunctional properties (oxygen evolution reaction (OER) and hydrogen evolution reaction (HER)) is crucial to commercial hydrogen production. In this work, layered double hydroxide (LDH)-zinc oxide (ZnO) heterostructures and oxygen vacancies are constructed synchronously by plasma magnetron sputtering of NiFe-LDH. Using the optimal conditions, ZnO nanoparticles are uniformly distributed on the NiFe-LDH nano-flowers, which are prepared uniformly on the three-dimensional porous Ni foam. In the LDH-ZnO heterostructures and oxygen vacancies, electrons are depleted at the Ni cations on the NiFe-LDH surface and the active sites change from Fe cations to Ni cations during OER. Our theoretical assessment confirms the change of active sites after the deposition of ZnO and reveals the charge-transfer mechanism. Owing to the significant improvement in the OER dynamics, overall water splitting can be achieved at only 1.603 V in 1 M KOH when the Ni/LDH-ZnO and Ni/LDH are used as the anode and cathode, respectively. The work reveals a novel design of self-supported catalytic electrodes for efficient water splitting and also provides insights into the surface modification of catalytic materials.
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