Insights into electrochemically anodic H2O2 synthesis on titanium dioxide in carbonate-based electrolytes

IF 6.3 2区 材料科学 Q2 CHEMISTRY, PHYSICAL Applied Surface Science Pub Date : 2025-02-12 DOI:10.1016/j.apsusc.2025.162669
Wenlong Guo , Yu He , Xinlin Tang , Shanshan Wang , Meng Li , Guangyong Gao , Peng Xiao , Xin Lian
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Abstract

For electrochemically anodic H2O2 synthesis, which one of bicarbonate (HCO3) and carbonate (CO32−) species plays a more important surface-mediating role in the formation of H2O2 is still in debate. In this study, titanium dioxide (TiO2) was utilized as a representative anode to evaluate the performance tendencies for H2O2 production in electrolytes with varying pH levels at different potentials. The findings support the mechanism that the formation of H2O2 is more favorable when HCO3 predominates in the vicinity of the anode. When considering the effects of both electro-decomposition and self-decomposition of H2O2, the findings are consistent. Interestingly, under the conditions more conducive to the H2O2 generation, the electro-decomposition of H2O2 likely could be more effectively inhibited. The adsorption of HCO3 and CO32− species on TiO2 are explored by performing an attenuated total reflection Fourier transform infrared spectroscopy. The ratio of the absorption peak area for HCO3 to CO32− species on TiO2, following an anodic reaction in carbonate-based electrolytes at varying pH levels, generally escalates with the heightened application of potentials. These results likely suggest that a local acidification took place near the anode, thereby further substantiating the pivotal impact of the equilibrium shift between carbonate species in the generation of H2O2.

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来源期刊
Applied Surface Science
Applied Surface Science 工程技术-材料科学:膜
CiteScore
12.50
自引率
7.50%
发文量
3393
审稿时长
67 days
期刊介绍: Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.
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