Water–solid contact electrification causes hydrogen peroxide production from hydroxyl radical recombination in sprayed microdroplets
Abstract
Contact electrification between water and a solid surface is crucial for physicochemical processes at water–solid interfaces. However, the nature of the involved processes remains poorly understood, especially in the initial stage of the interface formation. Here we report that H2O2is spontaneously produced from the hydroxyl groups on the solid surface when contact occurred. The density of hydroxyl groups affects the H2O2yield. The participation of hydroxyl groups in H2O2generation is confirmed by mass spectrometric detection of18O in the product of the reaction between 4-carboxyphenylboronic acid and18O–labeled H2O2resulting from18O2plasma treatment of the surface. We propose a model for H2O2generation based on recombination of the hydroxyl radicals produced from the surface hydroxyl groups in the water–solid contact process. Our observations show that the spontaneous generation of H2O2is universal on the surfaces of soil and atmospheric fine particles in a humid environment.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Aug 01, 2022
- Source ID
- 10.1073/pnas.2209056119
Entities
People
- Bolei Chen
- Guibin Jiang
- Hongqian Sang
- Juan Li
- Ligang Hu
- Lufeng Chen
- Maoyong Song
- Pu Wang
- Richard Zare
- Rongxiang He
- Shishang Guo
- Wenchang Zhang
- Yawei Wang
- Yong Liang
- Yongguang Yin
- Yu Xia
Organizations
- Air Force Office of Scientific Research
- Chinese Academy of Sciences
- Jianghan University
- National Natural Science Foundation of China
- Stanford University
- Wuhan University