Improved H2O2 Photogeneration and Stability on Rational Tailored Polymeric Carbon Nitride Via Enhanced O2 Adsorption

Zehao Li, Tianxiang Chen, Yufei Chen, Xiaoyuan Chen, Le Li, Siya Kuang, Jing Gao, Yuxuan Guo, Tsz Woon Benedict Lo, Jimin Du

Research output: Journal article publicationJournal articleAcademic research

Abstract

H2O2 yield is substantially hindered by the four-electron competitive reaction and limited oxygen-capture ability of PCN. We herein demonstrated a Rb+-modified PCN photocatalyst (CNR-0.5) for high-efficient H2O2 production, in which the introduction of Rb+ ions creates abundant edge active sites within –C[triple bond, length as m-dash]N/–OH groups of the triazine ring. The hydrophilicity and O2 adsorption capacity of the PCN catalyst were significantly improved. As a result, CNR-0.5 achieved a relatively high H2O2 yield (2225.05 µmol g−1 h−1), which is 37.58 times higher than that of pristine PCN under white light-emitting diode (LED) light. Experimental and theoretical results demonstrated that CNR-0.5 followed a two-step single-electron O2 reduction reaction pathway in the H2O2 photogeneration reaction. Additionally, the AQE of CNR-0.5 was 24.52% at 385 nm in an ethanol system with O2 injection. The excellent photocatalytic H2O2 production performance of CNR-0.5 in a real water body broadens the path for practical applications of PCN materials in photocatalytic H2O2 production.
Original languageEnglish
Pages (from-to)15051-15061
JournalAvailable at SSRN 4066147
Volume10
Issue number28
DOIs
Publication statusPublished - 25 Mar 2022

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