Journal
CHEMICAL ENGINEERING JOURNAL
Volume 439, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.135743
Keywords
Interface engineering; Electronic structure reconstruction; Core-shell heterostructure; Transition metal phosphide; Energy-saving electrolysis
Categories
Funding
- Natural Science Foundation of Jiangsu Province [BK20211602]
- National Natural Science Foundation of China [22102140]
- Six Talent Peaks Project in Jiangsu Province [2019-XCL-101]
- Specially-Appointed Professor Plan in Jiangsu Province
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The ion-exchange strategy to fabricate cobalt phosphide nanowire decorated with nickel phosphide nanosheets core@shell heterostructured arrays with sulfur doping at the interface (S-Co2P@Ni2P) has been demonstrated to be effective for both hydrogen evolution reaction (HER) and urea oxidation reaction (UOR), showing optimized absorption/desorption energies of reactants/products to accelerate the catalytic kinetics of HER and UOR.
Electrochemical hydrogen production is largely limited by the sluggish anodic oxygen evolution reaction (OER). Urea-assisted energy-saving alkaline hydrogen production has been promising alternative pathway. Herein, we demonstrate an ion-exchange strategy to fabricate cobalt phosphide nanowire decorated with nickel phosphide nanosheets core@shell heterostructured arrays with sulfur doping at the interface (S-Co2P@Ni2P) for both hydrogen evolution reaction (HER) and urea oxidation reaction (UOR). Interfacial S-doping induces charge transfer from S-Co2P to Ni2P in the heterostructure, generating electron-rich Ni centers and electron-deficient Co centers to be active sites for HER and UOR, respectively, with optimized absorption/desorption energies of reactants/products to accelerate the catalytic kinetics of HER and UOR. As a result, S-Co2P@Ni2P requires an overpotential of 103 mV and potential of 1.36 V (vs. RHE) to achieve 100 mA cm(-2) for HER and UOR, respectively, and drives the full urea electrolysis at 1.43 V to deliver current density of 10 mA cm(-2).
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