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首页> 外文期刊>Catalysis science & technology >Dual role of a g-C3N4/carbon intra-Schottky junction in charge carrier generation and separation for efficient solar H-2 production
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Dual role of a g-C3N4/carbon intra-Schottky junction in charge carrier generation and separation for efficient solar H-2 production

机译：g-C3N4 /碳intra-Schottky的双重角色结负责生成和载体高效的太阳能2生产分离

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摘要

Graphitic carbon nitride (g-C3N4) has been considered as a prominent metal-free visible light-driven photocatalyst for solar water splitting. However, the rapid recombination of photogenerated charge carriers massively limits its photocatalytic performance. Herein, we have constructed an intra-Schottky junction in g-C3N4 by enriching it with carbon via a solid-state calcination method to improve the charge carrier separation efficiency for solar photocatalytic H-2 production. Enriching of carbon in g-C3N4 led to the effective overlapping between 2p orbitals of both nitrogen and carbon, thereby inducing an intra-Schottky junction by increasing the C/N ratio as confirmed by XPS analysis. Importantly, compared to bare g-C3N4, similar to 6-fold enhancement on the photocatalytic H-2 production rate was achieved with 5 wt% carbon enriched g-C3N4 photocatalyst. The enhanced photocatalytic activity was mainly attributed to efficient charge carrier generation and separation through an intra-Schottky junction as revealed by photoluminescence, photocurrent and impedance studies. Moreover, the C-enriched g-C3N4 photocatalyst has shown higher photostability and photocatalytic H-2 production activity compared to that in previous reports. Thus, we trust that the present study may provide an insight into the fabrication of an intra-heterojunction for enhanced photocatalysis.
机译：石墨碳氮化(g-C3N4)不含金属的可见视为突出light-driven光催化剂对太阳能的水分裂。photogenerated充电运营商大规模限制其光催化性能。构造了一个在g-C3N4 intra-Schottky结通过丰富通过固态碳煅烧方法提高电荷载体太阳能光催化分离效率2生产。2 p轨道之间的有效重叠氮和碳,从而诱发了通过提高C / N intra-Schottky结比通过XPS分析确认。与裸g-C3N4相比,3年来,类似于增强光催化氢生产率达到了5 wt %碳富集g-C3N4光催化剂。活动主要是归因于有效电荷载体通过生成和分离intra-Schottky结了光致发光,光电流和阻抗研究。光催化剂表现出了更高的耐光性和光催化氢生产活动相比在以前的报告。目前的研究可能提供一个深入的了解制造的intra-heterojunction增强光催化。

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