Seeking highly active,stable and low-cost electrocatalysts used as both cathode and anode in overall water splitting is very crucial for the sustainable utilization of resources.Herein,a highly efficient and long-term...Seeking highly active,stable and low-cost electrocatalysts used as both cathode and anode in overall water splitting is very crucial for the sustainable utilization of resources.Herein,a highly efficient and long-term stable oxygen evolution reaction(OER)electrocatalyst Mn-doped CoP on foam Ni(MnCoP/NF)is synthesized by the one-step electrodeposition method.Owing to the synergetic effect among the Sepaktakraw-like morphology,the doped Mn element and the binder-free synthesis method,MnCoP/NF displays superior electrocatalytic activity and electrochemical stability toward OER.MnCoP/NF only requires an overpotential of 266 mV to deliver the current density of 10 mA·cm^(-2),demonstrating an excellent electrocatalytic activity even better than that of commercial catalysts of IrO_(2)/NF.And the retention rate of potential can still be maintained at 99.57%after the durability test as long as 240 h,indicating the prominent electrochemical stability of MnCoP/NF.Simultaneously,MnCoP/NF could be directly used as both cathode and anode in the two-electrode system for overall water splitting,exhibiting a low potential of 1.97 V for reaching 100 mA·cm^(-2).Impressive long-term stability of MnCoP/NF is also observed by limited activity decay after 240-h durability tests at 10 and 100 mA·cm^(-2).Thus,this study illustrates a feasible approach to the rational design of highly active and stable electrocatalyst and also provides valuable insights on the improved electrocatalytic performance of water splitting by Mn doping.展开更多
Two-dimensional(2D)carbon nanostructures play a critical role in energy-related applications,but developing facile and efficient strategies to synthesize these kinds of nanostructures is extremely rare.Herein,ultrathi...Two-dimensional(2D)carbon nanostructures play a critical role in energy-related applications,but developing facile and efficient strategies to synthesize these kinds of nanostructures is extremely rare.Herein,ultrathin carbon nanoribbons(CNRibs),with a thickness of 2–6 nm and length over 100 nm,have been strategically fabricated via a one-step pyrolysis of one-dimensional(1D)metal–organic framework nanorods(MOF NRods).Manipulating the diameters of MOF NRods will result in the formation of porous carbon nanostructures in 1D or 2D morphologies.Functional CNRibs with N doping or metal active site immobilization have also been studied.The CNRibs decorated with iron nanoclusters and single atoms have been used as excellent catalysts for the oxygen reduction reaction under both alkaline and acidic conditions,as well as zinc–air batteries.This work gives deep insights into the structural evolution from 1D to 2D morphology,providing an efficient approach to fabricate low-dimensional nanomaterials with controllable morphologies and functionalities for electrochemical applications.展开更多
基金This work was financially supported by the National Institute of Advanced Industrial Science and Technology(AIST),Jiangsu University(4023000046)Shenzhen Key Laboratory of Micro/Nano-Porous Functional Materials(SKLPM)(ZDSYS20210709112802010)+2 种基金China Postdoctoral Science Foundation(2022TQ0126 and 2022M721375)Guangdong Grants(2021ZT09C064)the National Key Research and Development Project(2022YFA1503900).
基金financially supported by the National Natural Science Foundation of China(Nos.21606115 and 21776119)the Postgraduate Research&Practice Innovation Program of Jiangsu Province(No.2021XKT1225)+1 种基金Xuzhou Science and Technology Plan Project(No.KC20195)the 100 innovative talent introduction projects in Hunan Province。
文摘Seeking highly active,stable and low-cost electrocatalysts used as both cathode and anode in overall water splitting is very crucial for the sustainable utilization of resources.Herein,a highly efficient and long-term stable oxygen evolution reaction(OER)electrocatalyst Mn-doped CoP on foam Ni(MnCoP/NF)is synthesized by the one-step electrodeposition method.Owing to the synergetic effect among the Sepaktakraw-like morphology,the doped Mn element and the binder-free synthesis method,MnCoP/NF displays superior electrocatalytic activity and electrochemical stability toward OER.MnCoP/NF only requires an overpotential of 266 mV to deliver the current density of 10 mA·cm^(-2),demonstrating an excellent electrocatalytic activity even better than that of commercial catalysts of IrO_(2)/NF.And the retention rate of potential can still be maintained at 99.57%after the durability test as long as 240 h,indicating the prominent electrochemical stability of MnCoP/NF.Simultaneously,MnCoP/NF could be directly used as both cathode and anode in the two-electrode system for overall water splitting,exhibiting a low potential of 1.97 V for reaching 100 mA·cm^(-2).Impressive long-term stability of MnCoP/NF is also observed by limited activity decay after 240-h durability tests at 10 and 100 mA·cm^(-2).Thus,this study illustrates a feasible approach to the rational design of highly active and stable electrocatalyst and also provides valuable insights on the improved electrocatalytic performance of water splitting by Mn doping.
基金The authors are thankful to Dr.Takeyuki Uchida for microscopic measurements,and AIST and Guangdong-Hong Kong-Macao Joint Laboratory(grant no.2019B121205001)for financial support.
文摘Two-dimensional(2D)carbon nanostructures play a critical role in energy-related applications,but developing facile and efficient strategies to synthesize these kinds of nanostructures is extremely rare.Herein,ultrathin carbon nanoribbons(CNRibs),with a thickness of 2–6 nm and length over 100 nm,have been strategically fabricated via a one-step pyrolysis of one-dimensional(1D)metal–organic framework nanorods(MOF NRods).Manipulating the diameters of MOF NRods will result in the formation of porous carbon nanostructures in 1D or 2D morphologies.Functional CNRibs with N doping or metal active site immobilization have also been studied.The CNRibs decorated with iron nanoclusters and single atoms have been used as excellent catalysts for the oxygen reduction reaction under both alkaline and acidic conditions,as well as zinc–air batteries.This work gives deep insights into the structural evolution from 1D to 2D morphology,providing an efficient approach to fabricate low-dimensional nanomaterials with controllable morphologies and functionalities for electrochemical applications.
