The direct urea fuel cell(DUFC)with high energy efficiency and convenience is expected to have promising practical applications in green energy development,but it is severely hindered by the slow kinetics of the intri...The direct urea fuel cell(DUFC)with high energy efficiency and convenience is expected to have promising practical applications in green energy development,but it is severely hindered by the slow kinetics of the intrinsic urea oxidation reaction(UOR).Herein,a built-in electric field(BEF)strategy to obtain efficient heterogeneous Ni_(2)P/NiSe_(2) electrocatalysts as bifunctional electrocatalysts for both the hydrogen evolution reaction(HER)and the UOR is reported.XPS,energy band structure analysis and DFT calculations verify that the BEF in the heterojunction can induce electron transfer between Ni_(2)P and NiSe_(2).More importantly,the BEF-induced interfacial charge distributions endow the Ni_(2)P/NiSe_(2) heterogeneous electrocatalysts with optimized binding free energy of the H*and urea intermediates,thereby resulting in an intrinsic enhancement of the catalytic activity.Our work may explore a pathway to design efficient bifunctional electrocatalysts by precisely constructing and manipulating an interfacial BEF.展开更多
基金supported by National Natural Science Foundation of China(Grant No.52001136,52171179,12304020)project funded by China Postdoctoral Science Foundation(2021M701718)Fundamental Research Funds for the Central Universities of China(30923011013).
文摘The direct urea fuel cell(DUFC)with high energy efficiency and convenience is expected to have promising practical applications in green energy development,but it is severely hindered by the slow kinetics of the intrinsic urea oxidation reaction(UOR).Herein,a built-in electric field(BEF)strategy to obtain efficient heterogeneous Ni_(2)P/NiSe_(2) electrocatalysts as bifunctional electrocatalysts for both the hydrogen evolution reaction(HER)and the UOR is reported.XPS,energy band structure analysis and DFT calculations verify that the BEF in the heterojunction can induce electron transfer between Ni_(2)P and NiSe_(2).More importantly,the BEF-induced interfacial charge distributions endow the Ni_(2)P/NiSe_(2) heterogeneous electrocatalysts with optimized binding free energy of the H*and urea intermediates,thereby resulting in an intrinsic enhancement of the catalytic activity.Our work may explore a pathway to design efficient bifunctional electrocatalysts by precisely constructing and manipulating an interfacial BEF.
