{"title":"Bi4O5Br2/COF S-Scheme Heterojunctions for Boosting H2O2 Photoproduction under Air and Pure Water","authors":"Jie-Yu Yue, Zi-Xian Pan, Peng Yang, Bo Tang","doi":"10.1021/acsmaterialslett.4c01273","DOIUrl":null,"url":null,"abstract":"Photosynthesizing H<sub>2</sub>O<sub>2</sub> by the oxygen reduction reaction (ORR) and the water oxidation reaction (WOR) is a promising green avenue for H<sub>2</sub>O<sub>2</sub> generation but is limited by the charge carrier recombination rate and sluggish reaction kinetics. Herein, the Bi<sub>4</sub>O<sub>5</sub>Br<sub>2</sub>/COF step-scheme (S-scheme) heterojunction (named BIT) is created for the first time by covalent organic frameworks (TTD-COF) and Bi<sub>4</sub>O<sub>5</sub>Br<sub>2</sub>, with an increased charge carrier separation efficiency and H<sub>2</sub>O<sub>2</sub> photosynthetic activity. Under air and pure water, BIT6 exhibits the highest H<sub>2</sub>O<sub>2</sub> production rate of 5221 μmol g<sup>–1</sup> h<sup>–1</sup>, which is 20 and 1.7 times greater than that of the individual Bi<sub>4</sub>O<sub>5</sub>Br<sub>2</sub> and TTD-COF. Subsequent mechanism analysis reveals that BIT6 photosynthesizes H<sub>2</sub>O<sub>2</sub> through overpowering indirect 2e<sup>–</sup> ORR paths (O<sub>2</sub>–O<sub>2</sub><sup>• –</sup>–H<sub>2</sub>O<sub>2</sub> and O<sub>2</sub>–O<sub>2</sub><sup>• –</sup>–O<sub>2</sub><sup>1</sup>–H<sub>2</sub>O<sub>2</sub>) and weak direct 2e<sup>–</sup> WOR pathways. Moreover, the in situ H<sub>2</sub>O<sub>2</sub> photogeneration process can be accompanied by the degradation of antibiotics. This study offers in-depth insights into the COF-based S-scheme heterojunctions for enhanced H<sub>2</sub>O<sub>2</sub> photoproduction.","PeriodicalId":19,"journal":{"name":"ACS Materials Letters","volume":null,"pages":null},"PeriodicalIF":9.6000,"publicationDate":"2024-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS Materials Letters","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1021/acsmaterialslett.4c01273","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Photosynthesizing H2O2 by the oxygen reduction reaction (ORR) and the water oxidation reaction (WOR) is a promising green avenue for H2O2 generation but is limited by the charge carrier recombination rate and sluggish reaction kinetics. Herein, the Bi4O5Br2/COF step-scheme (S-scheme) heterojunction (named BIT) is created for the first time by covalent organic frameworks (TTD-COF) and Bi4O5Br2, with an increased charge carrier separation efficiency and H2O2 photosynthetic activity. Under air and pure water, BIT6 exhibits the highest H2O2 production rate of 5221 μmol g–1 h–1, which is 20 and 1.7 times greater than that of the individual Bi4O5Br2 and TTD-COF. Subsequent mechanism analysis reveals that BIT6 photosynthesizes H2O2 through overpowering indirect 2e– ORR paths (O2–O2• ––H2O2 and O2–O2• ––O21–H2O2) and weak direct 2e– WOR pathways. Moreover, the in situ H2O2 photogeneration process can be accompanied by the degradation of antibiotics. This study offers in-depth insights into the COF-based S-scheme heterojunctions for enhanced H2O2 photoproduction.
期刊介绍:
ACS Materials Letters is a journal that publishes high-quality and urgent papers at the forefront of fundamental and applied research in the field of materials science. It aims to bridge the gap between materials and other disciplines such as chemistry, engineering, and biology. The journal encourages multidisciplinary and innovative research that addresses global challenges. Papers submitted to ACS Materials Letters should clearly demonstrate the need for rapid disclosure of key results. The journal is interested in various areas including the design, synthesis, characterization, and evaluation of emerging materials, understanding the relationships between structure, property, and performance, as well as developing materials for applications in energy, environment, biomedical, electronics, and catalysis. The journal has a 2-year impact factor of 11.4 and is dedicated to publishing transformative materials research with fast processing times. The editors and staff of ACS Materials Letters actively participate in major scientific conferences and engage closely with readers and authors. The journal also maintains an active presence on social media to provide authors with greater visibility.