光催化
X射线吸收精细结构
催化作用
可见光谱
制氢
光谱学
纳米片
吸收(声学)
材料科学
光催化分解水
氢
分解水
吸收光谱法
漫反射红外傅里叶变换
量子效率
金属
光化学
化学
纳米技术
光电子学
光学
冶金
有机化学
复合材料
物理
量子力学
作者
Chenjie Wang,Juan Xie,Ning Chen,Weifeng Chen,Penghui Bai,Hu Wang
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2021-12-10
卷期号:4 (12): 13796-13802
被引量:20
标识
DOI:10.1021/acsaem.1c02551
摘要
Developing high-efficiency, stable, and low-cost catalysts is essential for water splitting to generate hydrogen. Herein, an abundant material, g-C3N4 nanosheet, modified with a moderate amount of Cu atoms to form a special Cu-N3 structure exhibits excellent performance of photocatalytic hydrogen generation under visible light illumination. The structure of Cu-N3 is formed through Cu-atom-substituted C atoms in g-C3N4. X-ray absorption fine structure spectroscopy (XAFS) was employed to confirm the Cu coordination and the special structure of Cu-N3. Doping of Cu atoms not only regulates the energy band structure but also enhances the visible light absorption of g-C3N4 as confirmed by the UV–vis diffuse reflectance spectroscopy and Mott–Schottky test, and significantly improves the separation and transfer of photogenerated charges confirmed by the electrochemical test. Therefore, the catalyst exhibits a superior photocatalytic hydrogen production rate of 3774.35 μmol·g–1·h–1 and an apparent quantum efficiency (AQE) of 1.34% under visible light illumination (at 427 nm), which are both more than 3 times those of pure g-C3N4 nanosheets (1116.07 μmol·g–1·h–1 and 0.40%, respectively).
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