Wenlong Guo , Yu He , Xinlin Tang , Shanshan Wang , Meng Li , Guangyong Gao , Peng Xiao , Xin Lian
{"title":"Insights into electrochemically anodic H2O2 synthesis on titanium dioxide in carbonate-based electrolytes","authors":"Wenlong Guo , Yu He , Xinlin Tang , Shanshan Wang , Meng Li , Guangyong Gao , Peng Xiao , Xin Lian","doi":"10.1016/j.apsusc.2025.162669","DOIUrl":null,"url":null,"abstract":"<div><div>For electrochemically anodic H<sub>2</sub>O<sub>2</sub> synthesis, which one of bicarbonate (HCO<sub>3</sub><sup>−</sup>) and carbonate (CO<sub>3</sub><sup>2−</sup>) species plays a more important surface-mediating role in the formation of H<sub>2</sub>O<sub>2</sub> is still in debate. In this study, titanium dioxide (TiO<sub>2</sub>) was utilized as a representative anode to evaluate the performance tendencies for H<sub>2</sub>O<sub>2</sub> production in electrolytes with varying pH levels at different potentials. The findings support the mechanism that the formation of H<sub>2</sub>O<sub>2</sub> is more favorable when HCO<sub>3</sub><sup>−</sup> predominates in the vicinity of the anode. When considering the effects of both electro-decomposition and self-decomposition of H<sub>2</sub>O<sub>2</sub>, the findings are consistent. Interestingly, under the conditions more conducive to the H<sub>2</sub>O<sub>2</sub> generation, the electro-decomposition of H<sub>2</sub>O<sub>2</sub> likely could be more effectively inhibited. The adsorption of HCO<sub>3</sub><sup>−</sup> and CO<sub>3</sub><sup>2−</sup> species on TiO<sub>2</sub> are explored by performing an attenuated total reflection Fourier transform infrared spectroscopy. The ratio of the absorption peak area for HCO<sub>3</sub><sup>−</sup> to CO<sub>3</sub><sup>2−</sup> species on TiO<sub>2</sub>, 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 H<sub>2</sub>O<sub>2</sub>.</div></div>","PeriodicalId":247,"journal":{"name":"Applied Surface Science","volume":"691 ","pages":"Article 162669"},"PeriodicalIF":6.3000,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied Surface Science","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0169433225003836","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
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.
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.