Nanoclay‐Modulated Interfacial Chemical Bond and Internal Electric Field at the Co3O4/TiO2 p‐n Junction for Efficient Charge Separation

Author:

Zhang Shilin12,Wang Qingjie1,Zhang Peng3,Wang Jie4,Li Yue1,Lu Chang4,Sarwar Muhammad Tariq2,Dong Xiongbo2,Zhao Qihang2,Tang Aidong12ORCID,Fu Liangjie24,Yang Huaming24

Affiliation:

1. College of Chemistry and Chemical Engineering Central South University Changsha 410083 China

2. Engineering Research Center of Nano‐Geomaterials of Ministry of Education China University of Geosciences Wuhan 430074 China

3. College of Materials Science and Engineering Zhengzhou University Zhengzhou 450001 China

4. College of Minerals Processing and Bioengineering Central South University Changsha 410083 China

Abstract

AbstractTo achieve a high separation efficiency of photogenerated carriers in semiconductors, constructing high‐quality heterogeneous interfaces as charge flow highways is critical and challenging. This study successfully demonstrates an interfacial chemical bond and internal electric field (IEF) simultaneously modulated 0D/0D/1D‐Co3O4/TiO2/sepiolite composite catalyst by exploiting sepiolite surface‐interfacial interactions to adjust the Co2+/Co3+ ratio at the Co3O4/TiO2 heterointerface. In situ irradiation X‐ray photoelectron spectroscopy and density functional theory (DFT) calculations reveal that the interfacial Co2+OTi bond (compared to the Co3+OTi bond) plays a major role as an atomic‐level charge transport channel at the p‐n junction. Co2+/Co3+ ratio increase also enhances the IEF intensity. Therefore, the enhanced IEF cooperates with the interfacial Co2+OTi bond to enhance the photoelectron separation and migration efficiency. A coupled photocatalysis‐peroxymonosulfate activation system is used to evaluate the catalytic activity of Co3O4/TiO2/sepiolite. Furthermore, this work demonstrates how efficiently separated photoelectrons facilitate the synergy between photocatalysis and peroxymonosulfate activation to achieve deep pollutant degradation and reduce its ecotoxicity. This study presents a new strategy for constructing high‐quality heterogeneous interfaces by consciously modulating interfacial chemical bonds and IEF, and the strategy is expected to extend to this class of spinel‐structured semiconductors.

Funder

National Natural Science Foundation of China

Publisher

Wiley

Subject

Biomaterials,Biotechnology,General Materials Science,General Chemistry

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