In situ polymerization of poly(3,4-ethylenedioxythiophene)protective layer towards stable zinc anode  

作　　者：Debin Luo Peng Zhou Xiaowei Lv Panpan Sun Xiaohua Sun Hewei Zhao 

机构地区：[1]College of Materials and Chemical Engineering,Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials,China Three Gorges University,Yichang 443002,China [2]Hubei Three Gorges Laboratory,Yichang 443007,China [3]School of Chemistry,Beihang University,Beijing 100191,China

出　　处：《Nano Research》2025年第1期382-394,共13页纳米研究（英文版）

基　　金：the research fund of the National Natural Science Foundation of China(Nos.21902084,52222203 and 52073008);the Natural Science Foundation of Hubei Province(No.2022CFB354);the 111 Project of Hubei Province(No.2018-19-1)for financial support.

摘　　要：Aqueous zinc-ion devices are considered promising candidates for energy storage due to their high safety,low cost and relatively high energy density.However,the dendrite growth,hydrogen evolution reaction(HER)and corrosion of the zinc anode significantly limit the development of Zn-ion devices.Here,an inexpensive poly(3,4-ethylenedioxythiophene)(PEDOT)protective layer was constructed in situ on the Zn surface using electropolymerization to suppress dendrite growth and side reactions,thereby enhancing the reversibility of Zn.Experimental and theoretical calculations revealed that this hydrophilic protective layer promotes the desolvation process of hydrated Zn^(2+)and facilitates the transport of zinc ions,thus improving the thermodynamic and kinetic properties of Zn^(2+)deposition and inhibiting interfacial side reactions.Consequently,the optimized PEDOT@Zn symmetric battery exhibited a cycling stability exceeding 1250 h at 0.5 mA·cm^(-2)and 0.25 mAh·cm^(-2),with a significantly reduced overpotential(from 91.8 to 35 mV).With the assistance of the PEDOT protective layer,the PEDOT@Zn//Cu battery maintained approximately 99.5%Coulombic efficiency after 450 cycles.Ex-situ scanning electron microscopy(SEM)and in situ optical microscopy characterizations further confirmed that the PEDOT protective layer can effectively suppress the growth of zinc dendrites.Additionally,the Zn-ion capacitors assembled by the PEDOT@Zn and activated carbon also demonstrated outstanding cycling stability.

关 键 词：zinc-ion devices zinc anode poly(3 4-ethylenedioxythiophene)(PEDOT) DENDRITE desolvation process 

分 类 号：TM91[电气工程—电力电子与电力传动]