Hydrogen production via electrocatalytic water splitting is an efficient strategy to achieve carbon neutrality.However,the slow reaction kinetics of the oxygen evolution reaction(OER)hinders its large-scale industrial...Hydrogen production via electrocatalytic water splitting is an efficient strategy to achieve carbon neutrality.However,the slow reaction kinetics of the oxygen evolution reaction(OER)hinders its large-scale industrial application.Therefore,it is crucial to construct efficient,stable,and scalable OER electrocatalysts.This work used a two-step hydrothermal method to prepare cobalt and iron dual-doped NiS_(2) nanosheet arrays(Co,Fe–NiS_(2))on nickel foam.Theoretical and experimental studies demonstrate that the introduction of Co and Fe can modify the space charge redistribution of NiS_(2),optimizing the Gibbs free energy of the OER intermediate and accelerating water splitting kinetics.The catalyst Co,Fe–NiS_(2) exhibits excellent OER performance in alkaline media,achieving a large current density of 500 mA cm^(−2) at an overpotential of only 242 mV due to the synergistic effect of the two dopants.It can maintain its durability for 100 hours at 700 mA cm^(−2) without significant degradation.This study offers valuable insights into the impact of cation dual-doping modulation on catalytic activity and presents a possible pathway for effective industrial water splitting.展开更多
基金supported by the National Natural Science Foundation of China(21873018)the Education Department of Jilin Province(JJKH20221154KJ).
文摘Hydrogen production via electrocatalytic water splitting is an efficient strategy to achieve carbon neutrality.However,the slow reaction kinetics of the oxygen evolution reaction(OER)hinders its large-scale industrial application.Therefore,it is crucial to construct efficient,stable,and scalable OER electrocatalysts.This work used a two-step hydrothermal method to prepare cobalt and iron dual-doped NiS_(2) nanosheet arrays(Co,Fe–NiS_(2))on nickel foam.Theoretical and experimental studies demonstrate that the introduction of Co and Fe can modify the space charge redistribution of NiS_(2),optimizing the Gibbs free energy of the OER intermediate and accelerating water splitting kinetics.The catalyst Co,Fe–NiS_(2) exhibits excellent OER performance in alkaline media,achieving a large current density of 500 mA cm^(−2) at an overpotential of only 242 mV due to the synergistic effect of the two dopants.It can maintain its durability for 100 hours at 700 mA cm^(−2) without significant degradation.This study offers valuable insights into the impact of cation dual-doping modulation on catalytic activity and presents a possible pathway for effective industrial water splitting.
