Field-assisted thermionic emission toward quantitative modeling of charge-transfer mechanisms in contact electrification

作     者：Xin Xia Haoyu Wang Yunlong Zi 

作者机构：Department of Mechanical and Automation EngineeringThe Chinese University of Hong KongHong KongShatinN.T.China 

出 版 物：《SmartMat》 (智能材料（英文）)

年 卷 期：2022年第3卷第4期

页      面：619-631页

学科分类：07[理学] 070305[理学-高分子化学与物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：Research Grants Council University Grants Committee Grant/Award Numbers:14200120 14202121。 

主　　题：charge-transfer mechanism contact electrification field-assisted thermionic emission quantitative modeling triboelectric effect 

摘      要：Charge transfer mechanisms of contact electrification(CE)are essential for widening applications of the triboelectric nanogenerator,and thus are widely studied by scientists around the world.However,the quantitative modeling of CE,especially that between polymers,is still lacking.Herein,a model was proposed to describe the contributions from different mechanisms,including electron transfer and mass transfer in polymer/polymer CE through the fieldassisted thermionic emission,where three groups of charge transfer mechanisms were distinguished by the polarity of the charge transfer and the corresponding electric field.The results indicated that the total generated charge in CE is actually much larger than the measured net surface charge,confirming the bidirectional material-dependent charge transfer mechanisms between two surfaces,which is meaningful for understanding the millennium puzzle in triboelectrification and provides a new perspective for promoting the applications to tailor surface charge generation.