Water–solid contact electrification and catalysis adjusted by surface functional groups  

作　　者：Yusen Su Andy Berbille Zhong Lin Wang Wei Tang 

机构地区：[1]CAS Center for Excellence in Nanoscience,Beijing Institute of Nanoenergy and Nanosystems,Chinese Academy of Sciences,Beijing,100083,China [2]School of Nanoscience and Technology,University of Chinese Academy of Sciences,Beijing,100049,China [3]Georgia Institute of Technology,Atlanta,GA 30332-0245,USA

出　　处：《Nano Research》2024年第4期3344-3351,共8页纳米研究（英文版）

基　　金：supported by the National Key R&D Project from Minister of Science and Technology(No.2021YFA1201601);National Natural Science Foundation of China(No.52192610);Youth Innovation Promotion Association(W.T.);CAS-TWAS President’s Fellowship(A.B.).

摘　　要：Chemical functional groups on solid surfaces greatly influence contact electrification(CE)at water–solid interfaces.Previous studies of their effects mainly swapped materials or bonded related molecules to a substrate,introducing other factors of influence.This work aims at unambiguously demonstrating the role of functional groups in water-polymer CE.We study the contribution of functional groups,by using ion coupled plasma etching to modify a high-density polyethylene(HDPE)film,a polymer with a naturally quasi-null charge transfer ability.Fluoride(HDPE–F)and hydroxyl(HDPE–OH)functional groups are generated and endowed HDPE with charge withdrawing ability.HDPE–F withdraws 2.5–2.7 times more charges than HDPE–OH.Concurrently,the surface charges accumulated generate electrostatic forces,altering the droplets motion.This phenomenon provides another approach to study CE,helping to evaluate the contribution of electrons to solid–liquid CE.Finally,employing HDPE–F to perform contact-electro-catalysis shows its activity is 2.4 times higher than that of commercial fluorinated films.

关 键 词：contact-electro-catalysis charge transfer solid–liquid interfaces contact electrification 

分 类 号：O643.3[理学—物理化学]