{"title":"A Post-modified Donor-Acceptor Covalent Organic Framework for Enhanced Photocatalytic H2 Production and High Proton Transport","authors":"Saiqi Yang, Wei Liu, Yining Zhang, Xiaohui Jia, Jingyan Sun, Chenxi Zhang, Mingguang Liu","doi":"10.1039/d4ta04952g","DOIUrl":null,"url":null,"abstract":"The production of both the fuel and membrane for proton exchange membrane fuel cells (PEMFCs) often involves disparate materials, therefore, exploring a bifunctional material that can integrate hydrogen source supply and proton conduction is of significant application value in terms of PEMFCs. Herein, we perform a simple post-modification on a donor-acceptor (D-A) COF (PyBT-COF) through converting the abundant cyano group in its pores into carboxyl group (named PyBT-COF-COOH). The minor alteration yields remarkable improvement for PyBT-COF-COOH in photocatalytic hydrogen production activity and endows it with high proton conductivity. With Pt serving as a cocatalyst, PyBT-COF-COOH exhibits significantly improved photocatalytic hydrogen production rate of 8.15 mmol g-1 h-1, over 2.8-fold higher than that of PyBT-COF (2.88 mmol g-1 h-1), and reaches an apparent quantum efficiency of 5.10 % at 420 nm, owing to its enhanced hydrophilicity, dispersion, and carrier separation. The rich proton carriers and exchange binding sites within PyBT-COF-COOH also give it a notable proton conductivity of 4.91 × 10-3 S cm-1 at 353 K and 98 % RH. This study will provide inspiration for developing and utilizing such bifunctional COF materials with both excellent photocatalytic and proton conduction properties in terms of solar-energy conversion.","PeriodicalId":82,"journal":{"name":"Journal of Materials Chemistry A","volume":null,"pages":null},"PeriodicalIF":10.7000,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Materials Chemistry A","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1039/d4ta04952g","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
The production of both the fuel and membrane for proton exchange membrane fuel cells (PEMFCs) often involves disparate materials, therefore, exploring a bifunctional material that can integrate hydrogen source supply and proton conduction is of significant application value in terms of PEMFCs. Herein, we perform a simple post-modification on a donor-acceptor (D-A) COF (PyBT-COF) through converting the abundant cyano group in its pores into carboxyl group (named PyBT-COF-COOH). The minor alteration yields remarkable improvement for PyBT-COF-COOH in photocatalytic hydrogen production activity and endows it with high proton conductivity. With Pt serving as a cocatalyst, PyBT-COF-COOH exhibits significantly improved photocatalytic hydrogen production rate of 8.15 mmol g-1 h-1, over 2.8-fold higher than that of PyBT-COF (2.88 mmol g-1 h-1), and reaches an apparent quantum efficiency of 5.10 % at 420 nm, owing to its enhanced hydrophilicity, dispersion, and carrier separation. The rich proton carriers and exchange binding sites within PyBT-COF-COOH also give it a notable proton conductivity of 4.91 × 10-3 S cm-1 at 353 K and 98 % RH. This study will provide inspiration for developing and utilizing such bifunctional COF materials with both excellent photocatalytic and proton conduction properties in terms of solar-energy conversion.
期刊介绍:
The Journal of Materials Chemistry A, B & C covers a wide range of high-quality studies in the field of materials chemistry, with each section focusing on specific applications of the materials studied. Journal of Materials Chemistry A emphasizes applications in energy and sustainability, including topics such as artificial photosynthesis, batteries, and fuel cells. Journal of Materials Chemistry B focuses on applications in biology and medicine, while Journal of Materials Chemistry C covers applications in optical, magnetic, and electronic devices. Example topic areas within the scope of Journal of Materials Chemistry A include catalysis, green/sustainable materials, sensors, and water treatment, among others.