Supported single-atom catalysts(SACs)demonstrate exceptional catalytic performance,atom efficiency,and selectivity,as a result,they are the potential candidates used in oxygen evolution reaction(OER).However,stabilizi...Supported single-atom catalysts(SACs)demonstrate exceptional catalytic performance,atom efficiency,and selectivity,as a result,they are the potential candidates used in oxygen evolution reaction(OER).However,stabilizing monodispersed noblemetal atoms is challenging.This is especially true for two-dimensional(2D)layered double hydroxide(LDH)nanostructures.Here,we report the successful stabilization of ruthenium(Ru)single atoms(SAs).These SAs are located within a defective NiFe LDH nanosheet grown on the nickel foam(NF).This material is named Ru SAs/D-NiFe LDH@NF and formed through the*OOH hydrothermal reaction followed by etching.The resulting catalyst exhibits outstanding OER performance in alkaline media,achieving an exceedingly low overpotential(206 mV)at 50 mA·cm^(-2),which remarkably decreases relative to the overpotential in pristine NiFe LDH(311 mV).Ru SAs regulate the electron distribution near defects,optimizing the Ru-NiFe hydroxide interaction and diminishing energy barrier for forming intermediates,as revealed by density functional theory(DFT)calculations.Moreover,the catalyst demonstrates remarkable stability in Zn-air batteries(ZABs),delivering the maximal power density(170 mW·cm^(-2)).Furthermore,it maintains stable operation for 350 h,highlighting its practical viability.This work provides a versatile strategy for integrating single-atom sites into NiFe LDH,paving the way for the design of next-generation SACs for energy conversion applications.展开更多
基金supported by the National Natural Science Foundation of China(Nos.22309023,52301011,and 52231008)the China Postdoctoral Science Foundation(No.2022M720593)+2 种基金the project of Natural Science Foundation of Chongqing(No.CSTB2022NSCQ-MSX0270)the youth project of science and technology research program of Chongqing Municipal Education Commission of China(No.KJQN202501114)the special funding for research projects of Chongqing Human Resources and Social Security Bureau(No.2022CQBSHTB1023).
文摘Supported single-atom catalysts(SACs)demonstrate exceptional catalytic performance,atom efficiency,and selectivity,as a result,they are the potential candidates used in oxygen evolution reaction(OER).However,stabilizing monodispersed noblemetal atoms is challenging.This is especially true for two-dimensional(2D)layered double hydroxide(LDH)nanostructures.Here,we report the successful stabilization of ruthenium(Ru)single atoms(SAs).These SAs are located within a defective NiFe LDH nanosheet grown on the nickel foam(NF).This material is named Ru SAs/D-NiFe LDH@NF and formed through the*OOH hydrothermal reaction followed by etching.The resulting catalyst exhibits outstanding OER performance in alkaline media,achieving an exceedingly low overpotential(206 mV)at 50 mA·cm^(-2),which remarkably decreases relative to the overpotential in pristine NiFe LDH(311 mV).Ru SAs regulate the electron distribution near defects,optimizing the Ru-NiFe hydroxide interaction and diminishing energy barrier for forming intermediates,as revealed by density functional theory(DFT)calculations.Moreover,the catalyst demonstrates remarkable stability in Zn-air batteries(ZABs),delivering the maximal power density(170 mW·cm^(-2)).Furthermore,it maintains stable operation for 350 h,highlighting its practical viability.This work provides a versatile strategy for integrating single-atom sites into NiFe LDH,paving the way for the design of next-generation SACs for energy conversion applications.
