文献类型：期刊文献

英文题名：Understanding contact electrification via direct covalent bond cleavage of polymer chains for ultrahigh electrostatic charge density

作者：Fu, Haiyan[1,2];Gong, Jianliang[1];Cao, Junhao[1];Zhang, Zehua[5];Long, Zuchang[1];Yang, Bao[4];Chen, Jianzhuang[6];Chen, Yiwang[1,3];Tao, Xiaoming[4]

机构：[1]Jiangxi Normal Univ, Coll Chem & Chem Engn, Key Lab Fluorine & Silicon Energy Mat & Chem, Minist Educ, Nanchang 330022, Peoples R China;[2]Xinyu Univ, Jiangxi Key Lab Adv Mat & Applicat Solar Cells, Xinyu 338004, Peoples R China;[3]Nanchang Univ, Film Energy Chem Jiangxi Prov Key Lab FEC, 999 Xuefu Ave, Nanchang 330031, Peoples R China;[4]Hong Kong Polytech Univ, Inst Text & Clothing, Res Ctr Smart Wearable Technol, Hong Kong 999077, Peoples R China;[5]Univ Erlangen Nurnberg, Helmholtz Inst Erlangen Nurnberg Renewable Energy, Dept Chem & Biol Engn, D-91058 Erlangen, Germany;[6]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat, Shanghai 200237, Peoples R China

年份：2024

卷号：17

期号：11

起止页码：3776

外文期刊名：ENERGY & ENVIRONMENTAL SCIENCE

收录：;EI(收录号：20241916066018);WOS:【SCI-EXPANDED(收录号:WOS:001214951000001)】；

基金：J. Gong acknowledges the National Natural Science Foundation of China (no. 52103278), the High-Level and Urgently Needed Overseas Talents Program of Jiangxi Province (no. 2021BCJ25001), and the High-Level Talents (Youth) Program in Innovation and Entrepreneurship of Jiangxi Province (no. jxsq2023101108) for funding support. H. Fu acknowledges the Education Department of Jiangxi Province (GJJ2202201) for support. The authors thank the Helmholtz Institute Erlangen-Nuernberg for simulated calculation support.

语种：英文

外文关键词：Adhesives - Electrets - Electric utilities - Electrostatic generators - Electrostatics - Energy harvesting - Triboelectricity

摘要：The ancient and pervasively observed phenomenon of contact electrification (CE) is generally recognized to involve the transfer of electrons, ions, and materials between surfaces. However, compared to the mechanisms of electron and ion transfer, the understanding of how material transfer specifically contributes to this process remains less thoroughly developed. Herein a triboelectric material with an adhesive surface, namely a viscoelastic polyacrylate adhesive, was used to amplify the CE effect for better mechanism investigation to achieve a higher electrostatic charge density, which is widely accepted as the paramount factor influencing the electricity generation performance of mechanical energy harvesters that operate on the principle of electrostatic induction. A direct covalent bond cleavage mode of polymer chains was inspired and proposed based on the visible fiber drawing phenomenon during the CE process. The formation of mechaoradicals can be well explained via homolytic bond cleavage and generation of electrostatic charges by heterolytic bond cleavage within polymer chains, respectively. They were theoretically and energetically plausible based on systematic analysis of combining entangled polymer chain dynamics and the energy minimization principle with the assistance of polar substances (such as water), and experimentally demonstrated by adjusting the influential factors of relative humidity and interfacial adhesion force. A record charge density exceeding 90 nC cm(-2) was achieved using polytetrafluoroethylene to CE with adhesive surfaces, which is much higher than those generated by CE under ambient conditions in the reported literature. As a proof-of-concept demonstration, adhesive surface-enabled biomechanical energy harvesters with unique frequency-insensitive and high-performance characteristics were further developed to sustainably power a wearable tracking insole system without the anxiety of battery exhaustion and the burden of carrying additional accessories.