MXenes are a group of recently discovered 2D materials and have attracted extensive attention since their first report in 2011;they have shown excellent prospects for energy storage applications owing to their unique ...MXenes are a group of recently discovered 2D materials and have attracted extensive attention since their first report in 2011;they have shown excellent prospects for energy storage applications owing to their unique layered microstructure and tunable electrical properties.One major feature of MXenes is their tailorable surface terminations(e.g.,-F,-O,-OH).Numerous studies have indicated that the composition of the surface terminations can significantly impact the electrochemical properties of MXenes.Nonetheless,the underlying mechanisms are still poorly understood,mainly because of the difficulties in quantitative analysis and characterization.This review summarizes the latest research progress on MXene terminations.First,a systematic introduction to the approaches for preparing MXenes is presented,which generally dominates the surface terminations.Then,theoretical and experimental efforts regarding the surface terminations are discussed,and the influence of surface terminations on the electronic and electrochemical properties of MXenes are generalized.Finally,we present the significance and research prospects of MXene terminations.We expect this review to encourage research on MXenes and provide guidance for usingthese materials for batteries and supercapacitors.展开更多
Zinc-air batteries(ZABs)are regarded as promising next-generation energy storage devices but limited by their sluggish oxygen reduction/evolution reactions(ORR/OER).Herein,the bifunctional catalyst consisting of MXene...Zinc-air batteries(ZABs)are regarded as promising next-generation energy storage devices but limited by their sluggish oxygen reduction/evolution reactions(ORR/OER).Herein,the bifunctional catalyst consisting of MXene and metal compounds has been constructed via a controllable strategy.For demonstration,a 3D MXene framework with anchored heterostructure CoNi/CoNiP and nitrogen-doped carbon(NC)called H-CNP@M is constructed by metal-ion inducement and phosphorization.The bimetal-semiconductor heterostructure greatly enhances the catalytic performance.The H-CNP@M exhibits superior activities to-Ward ORR(E_(i/2)=0.833V)and OER(η_(10)=294 mV).Both aqueous and all-solid-state ZAB assembled with H-CNP@M demonstrate superior performance(peak power density of 166.5 mW/cm^(2)in aqueous case).This work provides a facile and general strategy to prepare MXene-supported bimetallic heterostructure for high-performance electrochemical energy devices.展开更多
基金funded by the National Natural Science Foundation of China(Nos.51731004 and 51902051)Natural Science Foundation of Jiangsu Province(No.BK20200386)。
文摘MXenes are a group of recently discovered 2D materials and have attracted extensive attention since their first report in 2011;they have shown excellent prospects for energy storage applications owing to their unique layered microstructure and tunable electrical properties.One major feature of MXenes is their tailorable surface terminations(e.g.,-F,-O,-OH).Numerous studies have indicated that the composition of the surface terminations can significantly impact the electrochemical properties of MXenes.Nonetheless,the underlying mechanisms are still poorly understood,mainly because of the difficulties in quantitative analysis and characterization.This review summarizes the latest research progress on MXene terminations.First,a systematic introduction to the approaches for preparing MXenes is presented,which generally dominates the surface terminations.Then,theoretical and experimental efforts regarding the surface terminations are discussed,and the influence of surface terminations on the electronic and electrochemical properties of MXenes are generalized.Finally,we present the significance and research prospects of MXene terminations.We expect this review to encourage research on MXenes and provide guidance for usingthese materials for batteries and supercapacitors.
基金supported by Natural Science Foundation of Jiangsu Province(No.BK20200406)National Natural Science Foundation of China(Nos.51731004,22075263,52002366)+2 种基金National Key R&D Program of China(No.2021YFA1501502)the Fundamental Research Funds for the Central Universities(No.WK2060000039)the Collaborative Research Fund(No.C5031-20G)from Research Grant Council,University Grants Committee,Hong Kong SAR,and Project of Strategic Importance Program of The Hong Kong Polytechnic University(No.P0035168).
文摘Zinc-air batteries(ZABs)are regarded as promising next-generation energy storage devices but limited by their sluggish oxygen reduction/evolution reactions(ORR/OER).Herein,the bifunctional catalyst consisting of MXene and metal compounds has been constructed via a controllable strategy.For demonstration,a 3D MXene framework with anchored heterostructure CoNi/CoNiP and nitrogen-doped carbon(NC)called H-CNP@M is constructed by metal-ion inducement and phosphorization.The bimetal-semiconductor heterostructure greatly enhances the catalytic performance.The H-CNP@M exhibits superior activities to-Ward ORR(E_(i/2)=0.833V)and OER(η_(10)=294 mV).Both aqueous and all-solid-state ZAB assembled with H-CNP@M demonstrate superior performance(peak power density of 166.5 mW/cm^(2)in aqueous case).This work provides a facile and general strategy to prepare MXene-supported bimetallic heterostructure for high-performance electrochemical energy devices.
