Owing to uncontrolled and uneven electrodeposition and side reactions,Zn metal anodes inevitably suffer from issues such as dendrite growth,hydrogen evolution reactions,and surface passivation.This paper proposes an e...Owing to uncontrolled and uneven electrodeposition and side reactions,Zn metal anodes inevitably suffer from issues such as dendrite growth,hydrogen evolution reactions,and surface passivation.This paper proposes an efficient strategy to address these critical issues for realizing long-life and high-capacity aqueous zinc-ion hybrid supercapacitors(ZHSCs)by incorporating low-concentration(0.05 mol·L^(-1))redox RbI electrolyte additives.Specifically,rubidium cations have the ability to influence the negative Zn electrode surface via an electrostatic shielding mechanism,effectively protecting the electrode and minimizing undesired side reactions.In an aqueous solution,iodide anions actively solvate Zn^(2+)ions by stabilizing and modulating the solvation shell surrounding Zn^(2+).Moreover,the presence of iodide ions promotes the uniform deposition of Zn^(2+)species by selective adsorption onto the electrode surface.The synergistic effect of the electrostatic shielding and halogen ions enables the realization of aqueous symmetric Zn||Zn cells with a substantial cycle life of more than 2000 h Additionally,when applied to commercial activated carbon(AC),the proposed strategy facilitates the development of aqueous ZHSCs,exhibiting high specific capacitances(148.8 F·g^(-1)at 4 A·g^(-1))and ultra-long cycling stability.展开更多
Zinc-ion batteries(ZIBs)have been extensively investigated and discussed as promising energy storage devices in recent years owing to their low cost,high energy density,inherent safety,and low environmental impact.Nev...Zinc-ion batteries(ZIBs)have been extensively investigated and discussed as promising energy storage devices in recent years owing to their low cost,high energy density,inherent safety,and low environmental impact.Nevertheless,several challenges remain that need to be prioritized before realizing the wide-spread application of ZIBs.In particular,the development of zinc anodes has been hindered by many challenges,such as inevitable zinc dendrites,corrosion passivation,and the hydrogen evolution reaction(HER),which have severely limited the practical application of high-performance ZIBs.This review starts with a systematic discussion of the origins of zinc dendrites,corrosion passiv-ation,and the HER,as well as their effects on battery performance.Subse-quently,we discuss solutions to the above problems to protect the zinc anode,including the improvement of zinc anode materials,modification of the anode–electrolyte interface,and optimization of the electrolyte.In particular,this review emphasizes design strategies to protect zinc anodes from an inte-grated perspective with broad interest rather than a view with limited focus.In the final section,comments and perspectives are provided for the future design of high-performance zinc anodes.展开更多
The aqueous solution-based zinc-ion hybrid supercapacitors(ZHSCs)have attracted immense attention as they are characterized by high power and energy densities.Electrode materials with high performance should be develo...The aqueous solution-based zinc-ion hybrid supercapacitors(ZHSCs)have attracted immense attention as they are characterized by high power and energy densities.Electrode materials with high performance should be developed for ZHSCs to resolve power imbalances between capacitor-and battery-type electrode materials.To address this issue,Nb_(2)O_(5) microspheres(with the structure like sweet dumplings with exposed stuffing)were produced following a hydrothermal process which was followed by a high-temperature calcination process.The specific capacity of the as-synthesized Nb_(2)O_(5) microspheres was up to 324 F·g^(-1) when the current density was 0.1 A·g^(-1),and the long-term capacity retention was 85%at the end of 5000 cycles.The results revealed that the nanospheres could be used as battery-type electrode materials for the fabrication of ZHSCs.Nb_(2)O_(5)//AC ZHSCs were fabricated with Nb_(2)O_(5) microspheres as the negative electrode materials,and activated carbon(AC)was used as the positive electrode material.As a result,a specific capacity of 108 F·g^(-1) was achieved when the current density was 0.1 A·g^(-1).The power density was high(8020 W·kg^(-1))at 28 Wh·kg^(-1),and the energy density was high(60 Wh·kg^(-1))at 100 W·kg^(-1).The structurally novel Nb_(2)O_(5) microspheres can be potentially used for the development of the next-generation ZHSCs that exhibit excellent performance.展开更多
基金financially supported by the National Natural Science Foundation of China(No.22209101)National Key R&D Program of China(No.2020YFA0710500)the Key Research and Development Program of Shaanxi(No.2022GXLH-01-23)for financial support。
文摘Owing to uncontrolled and uneven electrodeposition and side reactions,Zn metal anodes inevitably suffer from issues such as dendrite growth,hydrogen evolution reactions,and surface passivation.This paper proposes an efficient strategy to address these critical issues for realizing long-life and high-capacity aqueous zinc-ion hybrid supercapacitors(ZHSCs)by incorporating low-concentration(0.05 mol·L^(-1))redox RbI electrolyte additives.Specifically,rubidium cations have the ability to influence the negative Zn electrode surface via an electrostatic shielding mechanism,effectively protecting the electrode and minimizing undesired side reactions.In an aqueous solution,iodide anions actively solvate Zn^(2+)ions by stabilizing and modulating the solvation shell surrounding Zn^(2+).Moreover,the presence of iodide ions promotes the uniform deposition of Zn^(2+)species by selective adsorption onto the electrode surface.The synergistic effect of the electrostatic shielding and halogen ions enables the realization of aqueous symmetric Zn||Zn cells with a substantial cycle life of more than 2000 h Additionally,when applied to commercial activated carbon(AC),the proposed strategy facilitates the development of aqueous ZHSCs,exhibiting high specific capacitances(148.8 F·g^(-1)at 4 A·g^(-1))and ultra-long cycling stability.
基金Distinguished Youth Foundation of Hunan Province,Grant/Award Number:2019JJ20010National Natural Science Foundation of China,Grant/Award Numbers:51772093,52103053+3 种基金Postdoctoral Science Foundation of China,Grant/Award Number:2021M690980Projects of International Cooperation and Exchanges,Grant/Award Number:BZ2018010the“1515”Talent Cultivation Plan of Hunan Agricultural Universitythe National Key R&D Program of the Ministry of Science and Technology of China,Grant/Award Number:2021YFB2400403。
文摘Zinc-ion batteries(ZIBs)have been extensively investigated and discussed as promising energy storage devices in recent years owing to their low cost,high energy density,inherent safety,and low environmental impact.Nevertheless,several challenges remain that need to be prioritized before realizing the wide-spread application of ZIBs.In particular,the development of zinc anodes has been hindered by many challenges,such as inevitable zinc dendrites,corrosion passivation,and the hydrogen evolution reaction(HER),which have severely limited the practical application of high-performance ZIBs.This review starts with a systematic discussion of the origins of zinc dendrites,corrosion passiv-ation,and the HER,as well as their effects on battery performance.Subse-quently,we discuss solutions to the above problems to protect the zinc anode,including the improvement of zinc anode materials,modification of the anode–electrolyte interface,and optimization of the electrolyte.In particular,this review emphasizes design strategies to protect zinc anodes from an inte-grated perspective with broad interest rather than a view with limited focus.In the final section,comments and perspectives are provided for the future design of high-performance zinc anodes.
基金financially supported by the National Natural Science Foundation of China(Nos.51972108 and 51772090)China Postdoctoral Science Foundation(No.2021M693777)+1 种基金the Natural Science Foundation of Hunan Province(No.2020JJ4272)the Education Department of Hunan Province(No.19C0576)。
文摘The aqueous solution-based zinc-ion hybrid supercapacitors(ZHSCs)have attracted immense attention as they are characterized by high power and energy densities.Electrode materials with high performance should be developed for ZHSCs to resolve power imbalances between capacitor-and battery-type electrode materials.To address this issue,Nb_(2)O_(5) microspheres(with the structure like sweet dumplings with exposed stuffing)were produced following a hydrothermal process which was followed by a high-temperature calcination process.The specific capacity of the as-synthesized Nb_(2)O_(5) microspheres was up to 324 F·g^(-1) when the current density was 0.1 A·g^(-1),and the long-term capacity retention was 85%at the end of 5000 cycles.The results revealed that the nanospheres could be used as battery-type electrode materials for the fabrication of ZHSCs.Nb_(2)O_(5)//AC ZHSCs were fabricated with Nb_(2)O_(5) microspheres as the negative electrode materials,and activated carbon(AC)was used as the positive electrode material.As a result,a specific capacity of 108 F·g^(-1) was achieved when the current density was 0.1 A·g^(-1).The power density was high(8020 W·kg^(-1))at 28 Wh·kg^(-1),and the energy density was high(60 Wh·kg^(-1))at 100 W·kg^(-1).The structurally novel Nb_(2)O_(5) microspheres can be potentially used for the development of the next-generation ZHSCs that exhibit excellent performance.
