期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 31, 页码 27913-27923出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b08329
关键词
WO3 nanosheet; C3N4 nanosheet; 2D/2D hybrid nanomaterial; Z-scheme mechanism; photocatalytic H-2 generation
资金
- National Natural Science Foundation of China [21573166, 21271146, 20973128]
- Science & Technology Program of Science, Technology and Innovation Commission of Shenzhen Municipality [JCYJ20180302153921190]
- Funds for Creative Research Groups of Hubei Province [2014CFA007]
- Natural Science Foundation of Jiangsu Province [BK20151247]
Ultrathin two-dimensional (2D) nanomaterials can not only boost the interfacial charge migration and separation but also provide abundant reactive sites for the photocatalytic H-2 generation. Herein, a kind of direct Z-scheme 2D/2D hybrid nanomaterial is fabricated by post-annealing atomically ultrathin Pt-loaded g-C3N4 nanosheets (Pt-CN NSs) with a thickness of similar to 4.0 nm and hydrogen-treated WO3 nanosheets (HWO NSs) with a thickness of similar to 2.6 nm. The strong affinity existing between the two types of nanosheets with few-layer stacking results in the formation of atomically ultrathin 2D/2D hybrid nanomaterials (Pt-CN/HWO) with intimate interfacial contact in which the strong electronic interaction and efficient charge separation lead to a direct Z-scheme electron flowing from HWO NSs to CN NSs and then to the Pt cocatalyst for catalyzing the H-2 generation reaction. After optimizing the component ratio, the corresponding Pt-CN/HWO hybrid nanomaterial delivers a significantly boosted photocatalytic H-2 generation activity, up to 6.2 times as high as that of the Pt-CN/WO composite containing Pt-CN NSs and WO3 nanoplates (WO NPs) without hydrogen treatment. This result reveals that the atomically ultrathin nanosheets in the 2D/2D hybrid nanomaterials can not only deliver strong electronic interaction to promote the Z-scheme mechanism for maintaining the high reduction ability of g-C3N4 and high oxidation ability of WO3 but also alleviate the charge recombination, therefore resulting in the excellent photocatalytic H-2 generation performance.
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