首页|In situ regulating intimately connected heterostructure by decomposition of solid solution oxides toward high-efficient water oxidation
In situ regulating intimately connected heterostructure by decomposition of solid solution oxides toward high-efficient water oxidation
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Heterogeneous interfaces produced by inter-domain interactions on a nanoscale performs a crucial role in boosting the properties of an electrocatalyst toward oxygen evolution reaction(OER)process.Herein,a series of dual-phase electrodes with intimately connected heterointerfaces are prepared by in situ decomposing solid solution oxide of NixCoyFe100-x-yO,which grew on Ni foam massively via an ultrafast combustion approach.Particularly,with high-reaction kinetics caused by the reduction treatment at 450 ℃,the less electronegative Fe and Co are more oxyphilic than Ni,which facilitated their co-exsolution and formation of CoFe2O4/NiO oxide with enriched oxygen vacancies.Benefiting from the nanopor-ous framework,heterojunction structure,and oxygen defects,the self-supporting electrodes present rapid char-ge/mass transmission and provide abundant active sites for OER.The optimized sample(R-SNCF4.5)shows low overpotentials of 226 and 324 mV at 10 and 100 mA·cm-2,a small Tafel slope(46.7 mV·dec-1),and excellent stability.The assembled R-SNCF4.5//Pt/C/NF electrolyzer demonstrates continuous electrolysis over 50 h at a current density of 10 mA·cm-2,under 1.51 V.Density functional theory(DFT)calculations verify that the strong electronic modulation plays a critical part in the CoFe2O4/NiO hybrid by lowering the energy barriers for the rate-determining steps,and Fe sites are the most active OER sites.
Rapid combustionDecomposition of solid solution oxideDual-phase heterostructureOxygen evolution reactionTheoretical calculation
Hebei Key Laboratory of Flexible Functional Materials/Hebei Key Laboratory of Material Near-Net Forming Technology, School of Materials Science and Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,China
Key Laboratory of Advanced Ceramics and Machining Technology/Ministry of Education,School of Materials Science and Engineering,Tianjin University,Tianjin 300072,China
Electrochemical Engine Center,Department of Mechanical Engineering,Pennsylvania State University,University Park,PA 16802,USA
National Natural Science Foundation of ChinaNatural Science Foundation of Hebei ProvinceNatural Science Foundation of Hebei Province
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