Regulating Thermogalvanic Effect and Mechanical Robustness via Redox Ions for Flexible Quasi‑Solid‑State Thermocells

作     者：Peng Peng Jiaqian Zhou Lirong Liang Xuan Huang Haicai Lv Zhuoxin Liu Guangming Chen Peng Peng;Jiaqian Zhou;Lirong Liang;Xuan Huang;Haicai Lv;Zhuoxin Liu;Guangming Chen

作者机构：College of Materials Science and EngineeringShenzhen UniversityShenzhen 518055People’s Republic of China College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060People’s Republic of China 

出 版 物：《Nano-Micro Letters》 (纳微快报（英文版）)

年 卷 期：2022年第14卷第5期

页      面：153-167页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：The authors acknowledge the financial support by the National Natural Science Foundation of China(52103089) Foundation for Distinguished Young Talents in Higher Education of Guangdong,China(Project No.2020KQNCX061) the financial support by Shenzhen Fundamental Research Program(No.JCYJ20200109105604088) Open access funding provided by Shanghai Jiao Tong University 

主　　题：Thermocells Thermoelectric Flexible energy devices Wearable applications Hydrogel electrolytes 

摘      要：The design of power supply systems for wearable applications requires both flexibility and durability.Thermoelectrochemical cells(TECs)with large Seebeck coefficient can efficiently convert lowgrade heat into electricity,thus having attracted considerable attention in recent years.Utilizing hydrogel electrolyte essentially addresses the electrolyte leakage and complicated packaging issues existing in conventional liquid-based TECs,which well satisfies the need for flexibility.Whereas,the concern of mechanical robustness to ensure stable energy output remains yet to be addressed.Herein,a flexible quasisolid-state TEC is proposed based on the rational design of a hydrogel electrolyte,of which the thermogalvanic effect and mechanical robustness are simultaneously regulated via the multivalent ions of a redox couple.The introduced redox ions not only endow the hydrogel with excellent heat-to-electricity conversion capability,but also act as ionic crosslinks to afford a dual-crosslinked structure,resulting in reversible bonds for effective energy dissipation.The optimized TEC exhibits a high Seebeck coefficient of 1.43 mV K−1 and a significantly improved fracture toughness of 3555 J m^(−2),thereby can maintain a stable thermoelectrochemical performance against various harsh mechanical stimuli.This study reveals the high potential of the quasi-solid-state TEC as a flexible and durable energy supply system for wearable applications.