Probing Contact‐Electrification‐Induced Electron and Ion Transfers at a Liquid–Solid Interface. Issue 2 (29th November 2019)

• Record Type: Journal Article
• Authors: Nie, Jinhui; Ren, Zewei; Xu, Liang; Lin, Shiquan; Zhan, Fei; Chen, Xiangyu; Wang, Zhong Lin
• Is Part Of: Advanced materials. Volume 32:Issue 2(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-11-29
• Subjects: contact electrification -- electron transfer -- ion transfer -- liquid–solid interfaces; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.201905696
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: As a well‐known phenomenon, contact electrification (CE) has been studied for decades. Although recent studies have proven that CE between two solids is primarily due to electron transfer, the mechanism for CE between liquid and solid remains controversial. The CE process between different liquids and polytetrafluoroethylene (PTFE) film is systematically studied to clarify the electrification mechanism of the solid–liquid interface. The CE between deionized water and PTFE can produce a surface charges density in the scale of 1 nC cm −2, which is ten times higher than the calculation based on the pure ion‐transfer model. Hence, electron transfer is likely the dominating effect for this liquid–solid electrification process. Meanwhile, as ion concentration increases, the ion adsorption on the PTFE hinders electron transfer and results in the suppression of the transferred charge amount. Furthermore, there is an obvious charge transfer between oil and PTFE, which further confirms the presence of electron transfer between liquid and solid, simply because there are no ions in oil droplets. It is demonstrated that electron transfer plays the dominant role during CE between liquids and solids, which directly impacts the traditional understanding of the formation of an electric double layer (EDL) at a liquid–solid interface in physical chemistry. Abstract : The mechanism behind the contact electrification between liquid and solid remains controversial. According to experimental results and theoretical calculations, the contact electrification of ionic liquids and solids is caused by both electron transfer and ion transfer. Furthermore, the contact electrification between nonionic liquids and solids is mainly due to electron transfer.