journal article·2021-07-21

Enhanced Electrochemical H2O2 Production via Two-Electron Oxygen Reduction Enabled by Surface-Derived Amorphous Oxygen-Deficient TiO2–x

Zhaoquan Xu, Jie Liang, Yuanyuan Wang, Kai Dong, Xifeng Shi, Qian Liu, Yonglan Luo, Tingshuai Li, Yu Jia, Abdullah M. Asiri, Zhesheng Feng, Yan Wang, Dongwei Ma, Xuping Sun

ACS Applied Materials & Interfaces· Volume 13· Issue 28
Publisher page

Abstract

The electrochemical oxygen reduction reaction (ORR) is regarded as an attractive alternative to the anthraquinone process for sustainable and on-site hydrogen peroxide (H2O2) production. It is however hindered by low selectivity due to strong competition from the four-electron ORR and needs efficient catalysts to drive the 2e– ORR. Here, an acid oxidation strategy is proposed as an effective strategy to boost the 2e– ORR activity of metallic TiC via in-site generation of a surface amorphous oxygen-deficient TiO2–x layer. The resulting a-TiO2–x/TiC exhibits a low overpotential and high H2O2 selectivity (94.1% at 0.5 V vs reversible hydrogen electrode (RHE)), and it also demonstrates robust stability with a remarkable productivity of 7.19 mol gcat.–1 h–1 at 0.30 V vs RHE. The electrocatalytic mechanism of a-TiO2–x/TiC is further revealed by density functional theory calculations.
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Research context

OpenAlex topics: Electrocatalysts for Energy Conversion · Advanced battery technologies research · Fuel Cells and Related Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054, Sichuan, China

Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, Sichuan, China

Key Laboratory for Special Functional Materials of Ministry of Education, and School of Materials Science and Engineeing, Henan University, Kaifeng 475004, Henan, China

College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, Shandong, China

Institute for Advanced Study, Chengdu University, Chengdu 610106, Sichuan, China

Chemistry Department, Faculty of Science & Center of Excellence for Advanced Materials Research, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia

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