Alkaline hydrogen evolution reaction(HER)is suppressed by the water dissociation,leading to more sluggish kinetics than acidic HER.Developing multifunction catalysts via constructing heterogeneous interfaces is a feas...Alkaline hydrogen evolution reaction(HER)is suppressed by the water dissociation,leading to more sluggish kinetics than acidic HER.Developing multifunction catalysts via constructing heterogeneous interfaces is a feasible tactic to accelerate the alkaline HER.Herein,NiO coupled with Ni and MoxN(NMN)nanorods were prepared via a hydro-thermal synthesis combined with a thermal decomposition under ammonia atmosphere.The low crystalline NMN nanorods are rich in heterointerfaces,and have sufficient high active sites for HER.The synergistic effect between NiO and Ni-MoxN promotes the water dissociation the hydrogen adsorption,and the charge transfer,contributing to excellent alkaline HER activity.The overpotential on NMN is only 36 and 150 mV for the current density of 10 and 300 mA cm^(-2),respectively,and the Tafel slope is 48 mV/dec,demonstrating a superior performance for alkaline HER,which is even comparable to the commercial electrocatalysts.展开更多
Developing a cost-effective and stable electrocatalyst is the key to achieve the large-scale applications of water electrolysis to produce green hydrogen.Herein;an in situ hydrothermal growth strategy was put forward ...Developing a cost-effective and stable electrocatalyst is the key to achieve the large-scale applications of water electrolysis to produce green hydrogen.Herein;an in situ hydrothermal growth strategy was put forward to prepare a novel self-supporting electrode;that is;Ni-based hydrogen phosphate polyhedrons supported on 3D Ni foam.This electrode was composed of crystalline(Ni(H2PO4)2⋅2H2O;Ni(H3P2O7)2⋅2H2O);and amorphous phase in which NiO nanoparticles formed.The amorphous phase connected polyhedrons to the Ni foam substrate;forming multifarious heterogeneous interfaces.Such a structure possessed large number of active sites;favored the fast reaction kinetics and electron transport rate;synergistically resulting in a superior alkaline HER per-formance.In alkaline electrolyte;the electrode only needed a small overpotential of 69 mV to reach the current density of 10 mA cm-2 with a small Tafel slope of 56 mV dec-1;and exhibited a good stability at the current density of 100 mA cm-2 for 50 h.This in situ hydrothermal growth strategy opened up a new route to green synthesis of cost-effective and stable 3D heterostructured self-supporting electrode for water-splitting.展开更多
基金financially supported by National Key R&D Program of China(2022YFF0705104)National Natural Science Foundation of China(51402199,U21A20316)+2 种基金Liaoning Revitalization Talents Program(XLYC2007193)Natural Science Foundation of Liaoning Province(2022-MS-289,2021NLTS1210)Scientific Research Foundation of Education Department of Liaoning Province(LJKZ0457).
文摘Alkaline hydrogen evolution reaction(HER)is suppressed by the water dissociation,leading to more sluggish kinetics than acidic HER.Developing multifunction catalysts via constructing heterogeneous interfaces is a feasible tactic to accelerate the alkaline HER.Herein,NiO coupled with Ni and MoxN(NMN)nanorods were prepared via a hydro-thermal synthesis combined with a thermal decomposition under ammonia atmosphere.The low crystalline NMN nanorods are rich in heterointerfaces,and have sufficient high active sites for HER.The synergistic effect between NiO and Ni-MoxN promotes the water dissociation the hydrogen adsorption,and the charge transfer,contributing to excellent alkaline HER activity.The overpotential on NMN is only 36 and 150 mV for the current density of 10 and 300 mA cm^(-2),respectively,and the Tafel slope is 48 mV/dec,demonstrating a superior performance for alkaline HER,which is even comparable to the commercial electrocatalysts.
基金financially supported by National Key R&D Program of China(2022YFF0705104)National Natural Science Foundation of China(51402199,U21A20316)+2 种基金Liaoning Revitalization Talents Pro-gram(XLYC2007193)Natural Science Foundation of Liaoning Province(2022-MS-289,2021NLTS1210)Scientific Research Foundation of Education Department of Liaoning Province(LJKZ0457).
文摘Developing a cost-effective and stable electrocatalyst is the key to achieve the large-scale applications of water electrolysis to produce green hydrogen.Herein;an in situ hydrothermal growth strategy was put forward to prepare a novel self-supporting electrode;that is;Ni-based hydrogen phosphate polyhedrons supported on 3D Ni foam.This electrode was composed of crystalline(Ni(H2PO4)2⋅2H2O;Ni(H3P2O7)2⋅2H2O);and amorphous phase in which NiO nanoparticles formed.The amorphous phase connected polyhedrons to the Ni foam substrate;forming multifarious heterogeneous interfaces.Such a structure possessed large number of active sites;favored the fast reaction kinetics and electron transport rate;synergistically resulting in a superior alkaline HER per-formance.In alkaline electrolyte;the electrode only needed a small overpotential of 69 mV to reach the current density of 10 mA cm-2 with a small Tafel slope of 56 mV dec-1;and exhibited a good stability at the current density of 100 mA cm-2 for 50 h.This in situ hydrothermal growth strategy opened up a new route to green synthesis of cost-effective and stable 3D heterostructured self-supporting electrode for water-splitting.
