Bifunctional electrolyte addition for longer life and higher capacity of aqueous zinc-ion hybrid supercapacitors  

作　　者：Fan Zhang Si-Qi Li Li-Nan Xia Chao Yang Lei Li Kai-Ming Wang Chen-Liang Xu Yuan-Yuan Feng Bin Zhao Fei Shen Xiao-Gang Han Ling-Yun Zhu 

机构地区：[1]School of Electric Power,Civil Engineering and Architecture,Shanxi University,Taiyuan 030006,China [2]State Key Laboratory of Electrical Insulation and Power Equipment,School of Electrical Engineering,Xi'an Jiaotong University,Xi'an 710049,China [3]Department of Science Materials and Engineering,National University of Singapore,Singapore 117576,Singapore [4]School of Materials Science and Engineering,Anhui University,Hefei230601,China

出　　处：《Rare Metals》2024年第10期5060-5069,共10页稀有金属（英文版）

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。

摘　　要：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.

关 键 词：Zn metal anode Zn dendrite Aqueous zincion hybrid supercapacitor Rubidium iodide Synergistic effects of anions and cations 

分 类 号：O646[理学—物理化学] TM912[理学—化学]