Journal
APPLIED SURFACE SCIENCE
Volume 500, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2019.143985
Keywords
Isotype heterostructure; g-C3N4; Glucose-modified melamine; Photocatalytic hydrogen evolution
Categories
Funding
- National Science Foundation of China (NSFC) [51834009, 51801151]
- Hundred Talent Program of Shaanxi Province
- Key Laboratory Project of Shaanxi Education Department [18JS070, 18JK0560, 17JS081]
- Shaanxi Province Science Fund for Distinguished Young Scholars [2018JC-027]
- China Postdoctoral Science Foundation [2018M633643XB]
- Key Research and Development Project of Shaanxi Province [2017ZDXM-GY-033, 2017ZDXM-GY-028]
- Key Laboratory Project of Science and Technology Agency [13JS075]
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Constructing isotype heterostructure is an effective way to promote the separation of photogenerated charge carriers for graphitic carbon nitride (g-C3N4). However, the interface derived from different source precursors is not good enough for the charge separation of g-C3N4/g-C3N4 isotype heterojunctions, resulting in a limited improvement of photocatalytic performance. Here, we presented a rational design and synthesis of the gC(3)N(4)(bulk)/g-C3N4(nanosheet) (denoted as BCN/CNNS) isotype heterojunctions with tight interfaces for enhanced photocatalytic hydrogen evolution. Using glucose-modified melamine as the single-source precursor for the first time, an isotype heterojunction was in situ formed at the interface between bulk g-C3N4 and g-C3N4 nanosheet. Due to the enhanced visible light absorption and promoted charge carrier separation, the in situ formed BCN/CNNS isotype heterojunctions exhibited highly improved photocatalytic hydrogen evolution activity under visible light irradiation, which was 16.4 and 11.5 times than those of the bare BCN and CNNS, respectively. Such an in situ formed isotype heterojunction with tight interfaces originated from the thermal polymerization of single-source glucose-modified melamine would present a new avenue for developing efficient g-C3N4-based isotype heterojunction photocatalysts.
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