Potassium-ion hybrid capacitors(PIHCs)tactfully combining capacitor-type cathode with battery-type anode have recently attracted increasing attentions due to their advantages of decent energy density,high power densit...Potassium-ion hybrid capacitors(PIHCs)tactfully combining capacitor-type cathode with battery-type anode have recently attracted increasing attentions due to their advantages of decent energy density,high power density,and low cost;the mismatches of capacity and kinetics between capacitor-type cathode and battery-type anode in PIHCs yet hinder their overall performance output.Herein,based on prediction of density functional theory calculations,we find Se/N co-doped porous carbon is a promising candidate for K+storage and thus develop a simple and universal self-sacrifice template method to fabricate Se and N co-doped three-dimensional(3D)macroporous carbon(Se/N-3DMpC),which features favorable properties of connective hier-archical pores,expanded interlayer structure,and rich activity site for boosting pseudocapacitive activity and kinetics toward K^(+)storage anode and enhancing capacitance performance for the reversible anion adsorption/desorption cath-ode.As expected,the as-assembled PIHCs full cell with a working voltage as high as 4.0 V delivers a high energy density of 186 Wh kg^(−1) and a power output of 8100 W kg^(−1) as well as excellent long service life.The proof-of-concept PIHCs with excellent performance open a new avenue for the development and application of high-performance hybrid capacitors.展开更多
Sodium-tellurium(Na-Te)battery,thanks to high theoretical capacity and abundant sodium source,has been envisaged as one promising battery technology,its practical application yet faces daunting challenges regarding ho...Sodium-tellurium(Na-Te)battery,thanks to high theoretical capacity and abundant sodium source,has been envisaged as one promising battery technology,its practical application yet faces daunting challenges regarding how to mitigate the critical issues of uncontrollable dendrites growth at Na anode and polytellurides shuttling effect at Te cathode.We here report an elaborative design for fabrication of microsphere skeleton nanohybrids with three-dimensional(3D)hierarchical porous carbon loading CeO_(2)quantum dots(CeO_(2)-QDs/HPC),which feature highly favorable properties of sodiophilic and catalysis for hosting sodium and tellurium,respectively.The systematic investigations coupling with first-principle calculations demonstrate the CeO_(2)-QDs/HPC not only offers favorable structure and abundant electrocatalytic sites for facilitating interconversion between Te and NaxTe as a cathode host,but also can function as dendrite inhibitor anode host for reversible sodium electro-plating/deposition.Such Na-Te battery exhibits admiring electrochemical performance with an impressive specific capacity of 392 mAh g1,a long cycling stability over 1000 cycles,as well as remarkably high energy density of 192 Wh kg1 based on the total mass of anode and cathode.Such proof-of-concept bifunctional host design for active electrode materials can render a new insight and direction to the development of high-performance Na-Te batteries.展开更多
基金This work was supported by the National Natural Science Foundation of China(Project No.21875253)CAS-Commonwealth Scientific and Industrial Research Organization(CSIRO)Joint Research Projects(121835KYSB20200039)Scientific Research and Equipment Development Project of CAS(YJKYYQ20190007).
文摘Potassium-ion hybrid capacitors(PIHCs)tactfully combining capacitor-type cathode with battery-type anode have recently attracted increasing attentions due to their advantages of decent energy density,high power density,and low cost;the mismatches of capacity and kinetics between capacitor-type cathode and battery-type anode in PIHCs yet hinder their overall performance output.Herein,based on prediction of density functional theory calculations,we find Se/N co-doped porous carbon is a promising candidate for K+storage and thus develop a simple and universal self-sacrifice template method to fabricate Se and N co-doped three-dimensional(3D)macroporous carbon(Se/N-3DMpC),which features favorable properties of connective hier-archical pores,expanded interlayer structure,and rich activity site for boosting pseudocapacitive activity and kinetics toward K^(+)storage anode and enhancing capacitance performance for the reversible anion adsorption/desorption cath-ode.As expected,the as-assembled PIHCs full cell with a working voltage as high as 4.0 V delivers a high energy density of 186 Wh kg^(−1) and a power output of 8100 W kg^(−1) as well as excellent long service life.The proof-of-concept PIHCs with excellent performance open a new avenue for the development and application of high-performance hybrid capacitors.
基金National Natural Science Foundation of China,Grant/Award Numbers:21875253,51872048,52073061Natural Science Foundation of Fujian Province,Grant/Award Numbers:2021J01430167,2021J02020+2 种基金CAS-Commonwealth Scientific and Industrial Research Organization(CSIRO)Joint Research Projects,Grant/Award Number:121835KYSB20200039Scientific Research and Equipment Development Project of CAS,Grant/Award Number:YJKYYQ20190007Joint Fund of the Yulin University and the Dalian National Laboratory for Clean Energy,Grant/Award Number:YLU-DNL Fund 2021011。
文摘Sodium-tellurium(Na-Te)battery,thanks to high theoretical capacity and abundant sodium source,has been envisaged as one promising battery technology,its practical application yet faces daunting challenges regarding how to mitigate the critical issues of uncontrollable dendrites growth at Na anode and polytellurides shuttling effect at Te cathode.We here report an elaborative design for fabrication of microsphere skeleton nanohybrids with three-dimensional(3D)hierarchical porous carbon loading CeO_(2)quantum dots(CeO_(2)-QDs/HPC),which feature highly favorable properties of sodiophilic and catalysis for hosting sodium and tellurium,respectively.The systematic investigations coupling with first-principle calculations demonstrate the CeO_(2)-QDs/HPC not only offers favorable structure and abundant electrocatalytic sites for facilitating interconversion between Te and NaxTe as a cathode host,but also can function as dendrite inhibitor anode host for reversible sodium electro-plating/deposition.Such Na-Te battery exhibits admiring electrochemical performance with an impressive specific capacity of 392 mAh g1,a long cycling stability over 1000 cycles,as well as remarkably high energy density of 192 Wh kg1 based on the total mass of anode and cathode.Such proof-of-concept bifunctional host design for active electrode materials can render a new insight and direction to the development of high-performance Na-Te batteries.
