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Physical adsorption of OH- causes anomalous charging at oxide-water interfaces
Yingchun Zhang1, Yong-Bin Zhuang2, Xiandong Liu1
1State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, Jiangsu 210023, P. R. China. xiandongliu@nju.edu.cn.
Abstract:
This study reveals a charging mechanism at oxide-water interfaces, solving the puzzle that challenges the traditional electrical double layer (EDL) model. We found that the experimentally measured zeta potential is caused by physically adsorbed OH-, instead of acidic dissociation of surface OHs and the first-layer water. This mechanism should apply for a wide range of material interfaces and could find applications in future.
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