光催化
异质结
非阻塞I/O
材料科学
氮气
X射线光电子能谱
光化学
制氢
化学工程
载流子
石墨氮化碳
氮化物
化学
光电子学
纳米技术
催化作用
图层(电子)
有机化学
工程类
生物化学
作者
Youmei Li,Jiasong Zhong,Jianzhang Li
标识
DOI:10.1016/j.optmat.2022.113296
摘要
In view of limited light response capacity and fast recombination of photon-excited charge pairs (e−/h+), photocatalytic efficiency of graphite carbon nitride (g-C3N4) is inferior, giving rise to the confined utility of the single g-C3N4 (GCN). In this paper, S-scheme NiO/g-C3N4 (NiO/CN) heterojunction photocatalysts were acquired via a facile impregnating approach and characterized through a sequence of measurements. Based on the characterization results of XPS and ESR, abundant nitrogen defects exist in the prepared NiO/g-C3N4 sample. Nitrogen vacancies (NVs) serve as the electron trapping site, effectively inhibiting the recombination of photo-induced charge pairs, dramatically boosting the photocatalytic hydrogen production efficiency. Under solar light irradiation, 2% NiO/CN composite presents the highest photocatalytic H2 generation performance (169.5 μmol h−1 g−1) without any co-catalyst, realizing 140.3 folds higher than that of GCN (1.2 μmol h−1 g−1). S-scheme NiO/g-C3N4 heterojunctions and the defect level formed by nitrogen vacancies (NVs) accelerate the photo-induced carrier separation and transfer. This approach is demonstrated to be a potential measure to remarkably ameliorate the photocatalytic H2 production behavior of g-C3N4 via utilizing the transition metal oxides to effectively separate and migrate photo-excited charge pairs under solar light irradiation.
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