Ion–Electron Coupling Enables Ionic Thermoelectric Material with New Operation Mode and High Energy Density  

作　　者：Yongjie He Shaowei Li Rui Chen Xu Liu George Omololu Odunmbaku Wei Fang Xiaoxue Lin Zeping Ou Qianzhi Gou Jiacheng Wang Nabonswende Aida Nadege Ouedraogo Jing Li Meng Li Chen Li Yujie Zheng Shanshan Chen Yongli Zhou Kuan Sun 

机构地区：[1]MOE Key Laboratory of Low-grade Energy Utilization Technologies and Systems,CQU-NUS Renewable Energy Materials and Devices Joint Laboratory,School of Energy and Power Engineering,Chongqing University,Chongqing 400044,People’s Republic of China

出　　处：《Nano-Micro Letters》2023年第7期193-203,共11页纳微快报（英文版）

基　　金：financially supported by research grants from the Natural Science Foundation of China [Grant No. 62074022 (K.S.), 12004057 (Y.J.Z.), 52173235 (M.L.)];the Natural Science Foundation of Chongqing [cstc2021jcyj-jqX0015 (K.S.)];Chongqing Talent Plan [cstc2021ycjh-bgzxm0334 (S.S.C.), CQYC2021059206 (K.S.)];Fundamental Research Funds for the Central Universities [No. 2020CDJQY-A055 (K.S.)];the Key Laboratory of Low-grade Energy Utilization Technologies and Systems [Grant No. LLEUTS-201901 (K.S.)];support from Chongqing Postgraduate Research and Innovation Project (CYS22032)。

摘　　要：Ionic thermoelectrics(i-TE) possesses great potential in powering distributed electronics because it can generate thermopower up to tens of millivolts per Kelvin. However,as ions cannot enter external circuit, the utilization of i-TE is currently based on capacitive charge/discharge, which results in discontinuous working mode and low energy density. Here,we introduce an ion–electron thermoelectric synergistic(IETS)effect by utilizing an ion–electron conductor. Electrons/holes can drift under the electric field generated by thermodiffusion of ions, thus converting the ionic current into electrical current that can pass through the external circuit. Due to the IETS effect, i-TE is able to operate continuously for over 3000 min.Moreover, our i-TE exhibits a thermopower of 32.7 mV K^(-1) and an energy density of 553.9 J m^(-2), which is more than 6.9 times of the highest reported value. Consequently, direct powering of electronics is achieved with i-TE. This work provides a novel strategy for the design of high-performance i-TE materials.

关 键 词：Ionic thermoelectric Ion–electron coupling Ionic conductivity THERMOPOWER 

分 类 号：TB34[一般工业技术—材料科学与工程]