期刊
CHEMICAL ENGINEERING JOURNAL
卷 394, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.124964
关键词
Bridging effect; Superficial potential trap; Co atom bridge; g-C3N4; Photocatalytic hydrogen evolution
资金
- National Natural Science Foundation of China [51802255]
- Natural Science Foundation of Shaanxi Province [2020JZ-02]
- National Key Research and Development Program of China [2017YFE0193900]
- China Postdoctoral Science Foundation [2017M623161]
- China Fundamental Research Funds for the Central Universities
- project of Innovative Team of Shaanxi Province
- World-Class Universities (Disciplines)
- Characteristic Development Guidance Funds for the Central Universities
To achieve a highly efficient charge transfer and separation for photocatalysis, we propose a bridging effect to construct a direct charge transfer path in g-C3N4 via introducing Co atoms into the nitride pores of g-C3N4 to trigger a superficial potential trap. By utilizing such superficial potential trap, the Co atom can bridge the ultrafine Pt NPs and g-C3N4 as catalyst for hydrogen evolution reaction. The bridging effect of Co heteroatom in g-C3N4(Co)/Pt can rapidly transfer the photo-generated electrons on g-C3N4 to Pt NP surface, thus significantly improving the charge separation efficiency. Moreover, the water molecule is more easily dissociated by Co atom bridge, enabling its kinetics favorable for photocatalytic hydrogen reaction. As a consequence, the photocatalytic H-2 evolution rate of g-C3N4(Co)/Pt reaches 7.145 mmol g(-1) h(-1) with an excellent apparent quantum efficiency of 19.0% at 420 nm, which is 145.8 times than that of pristine g-C3N4.
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