石墨氮化碳
材料科学
空位缺陷
煅烧
吸收边
氮化物
氮化碳
光电子学
电子结构
碳纤维
吸收(声学)
带隙
光催化
光化学
纳米技术
化学工程
化学
图层(电子)
结晶学
催化作用
计算化学
复合材料
工程类
复合数
生物化学
作者
Lianlian Liu,Fei Chen,Jing‐Hang Wu,Ming‐Kun Ke,Chao Cui,Jie‐Jie Chen,Han‐Qing Yu
标识
DOI:10.1016/j.apcatb.2021.120845
摘要
The utilization of solar energy for hydrogen peroxide (H2O2) production using graphitic carbon nitride (g-C3N4) under visible light irradiation has attracted increasing interests due to its high efficiency and cost-effectiveness. However, this process is still limited by slow charge carrier migration. In this work, continuous regulation of band structure inside g-C3N4 is obtained by defect engineering through gradient calcination. The H2O2 production rate (4980 μmol g−1 h−1) of nitrogen-defective g-C3N4 is 18 times higher than that of pristine g-C3N4. The π*CN-C signals in X-ray absorption near-edge structure spectrum decline, indicating an increased N-defects. The N-defects with the electronic vacancies in the heptazine intensifies its light-harvesting on g-C3N4 and also improve the selectivity of 2-electron O2 reduction. A quantitative structure-activity relationship between N-defects and band structure is unveiled. This work offers an accessible strategy to design photocatalysts with desirable defect structures for energy conservation.
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