Potassium ions and cyano group modified g-C3N4 for effective generation of H2O2 through two-electron oxygen reduction

IF 10.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Science China Chemistry Pub Date : 2024-10-22 DOI:10.1007/s11426-024-2200-1

Dongying Wang, Shulan Pu, Yongmin Chen, Ke Lei, Yujie Duan, Linjiao Mao, Xuhui Zeng, Xi Luo, Yuntao Zhang, Yuqin Dong, Jin Zhong Zhang, Yan Sun

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引用次数: 0

Abstract

Potassium ions (K⁺) doped graphitic carbon nitride (g-C₃N₄) was prepared by a thermal etching method using potassium hydroxide (KOH) as an ion source. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) results showed that the generation of the cyano group was detected while introducing K⁺. Under simulated sunlight irradiation, the sample with a K⁺ doping amount of 10% showed the highest hydrogen peroxide (H₂O₂) generation rate of 2,140.2 µmol h⁻¹ g⁻¹. The apparent quantum yield (AQY) at 400 nm and the solar-to-chemical conversion (SCC) are 4.35% and 1.23%, respectively. K⁺ acted as a bridge between g-C₃N₄ layers, which enhanced charge transfer efficiency. Meanwhile, the cyano group enhanced the adsorption capacity of protons (H⁺) and promoted the yield of H₂O₂. The catalyst exhibited excellent photocatalytic stability based on four-cycle experiments. In addition, a mechanism study showed that superoxide radicals (·O₂⁻) were the most important active species in the reaction system. Photocatalytic production of H₂O₂ was achieved through consecutive single-electron steps. This study deepens the understanding of the oxygen reduction reaction process and opens up a new venue for improving H₂O₂ generation.

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来源期刊

Science China Chemistry CHEMISTRY, MULTIDISCIPLINARY-

CiteScore

14.40

自引率

7.30%

发文量

3787

审稿时长

2.2 months

期刊介绍： Science China Chemistry, co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China and published by Science China Press, publishes high-quality original research in both basic and applied chemistry. Indexed by Science Citation Index, it is a premier academic journal in the field. Categories of articles include: Highlights. Brief summaries and scholarly comments on recent research achievements in any field of chemistry. Perspectives. Concise reports on thelatest chemistry trends of interest to scientists worldwide, including discussions of research breakthroughs and interpretations of important science and funding policies. Reviews. In-depth summaries of representative results and achievements of the past 5–10 years in selected topics based on or closely related to the research expertise of the authors, providing a thorough assessment of the significance, current status, and future research directions of the field.