Polyoxometalate-based flexible conductive materials with superionic conductivity  

作　　者：Yuxin Wang Shuping Xue Jun Geng Ying Lu Teng Li Xiaozheng Duan Xue Bai Yanli Yang Jingqi Yang Shuxia Liu 

机构地区：[1]Key Laboratory of Polyoxometalate and Reticular Material Chemistry of Ministry of Education,College of Chemistry,Northeast Normal University,Changchun 130024,China [2]State Key Laboratory of Polymer Physics and Chemistry,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China

出　　处：《Science China Chemistry》2024年第10期3299-3309,共11页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China (22071019, 21872021, 21671033);financially supported by the National Natural Science Foundation of China (9237210012, 22073094);the Science and Technology Development Program of Jilin Province (20240602003RC, 20210402059GH);the Program for Young Scholars in Regional Development of Chinese Academy of Sciences (CAS);the essential support of the Network and Computing Center at Changchun Institute of Applied Chemistry, CAS;the Computing Center of Jilin Province。

摘　　要：Flexible ion-conductive materials exhibit intriguing advantages for applications in flexible electronic devices.Currently,the further enhancement of their conductivity within environmental limitations is an urgent demand for the development of flexible electronic devices,yet remains as a great challenge.Herein,we report a“dual-acid”strategy,via the encapsulation of two acids,H_(3)PW_(12)O_(40)(HPW) and NH_(2)SO_(3)H(SA),with synergistic interaction into poly(vinyl alcohol)-glycerol(PVA-Gly) hydrogel,to achieve polyoxometalate(POM)-based flexible materials with superionic conductivity under various environmental conditions.As a representative example,the prepared PVA-Gly/HPW-SA-20% hydrogel presents an ultrahigh proton conductivity ranging from -30℃(3.33×10^(-2)S cm^(-1)) to room temperature(2.78×10^(-1)S cm^(-1)) under ambient humidity.Moreover,the PVA-Gly/HPW-SA-20% hydrogel exhibits remarkable advantages in anti-freezing,mechanical flexibility and self-adhesiveness,making it a promising multifunctional electrolyte for flexible electronic devices.Both experimental results and molecular dynamics(MD) simulations jointly demonstrate that SA bridges HPW clusters to form a dense proton transport pathway induced by multiple electrostatic and hydrogen bonding interactions between SA and HPW counterparts,which contributes to the high-level proton conductivity of the PVA-Gly/HPW-SA-20% hydrogel.This work provides new insights into the design of POM-based flexible materials with superionic conductivity.

关 键 词：POLYOXOMETALATES proton conduction dual-acid effect HYDROGEL molecular dynamics simulation 

分 类 号：TB34[一般工业技术—材料科学与工程]