Template-free synthesis of porous graphitic carbon nitride microspheres for enhanced photocatalytic hydrogen generation with high stability
Template-free synthesis of porous graphitic carbon nitride microspheres for enhanced photocatalytic hydrogen generation with high stability
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DOI：
10.1016/j.apcatb.2014.10.045
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发表时间：
2015-04-01
影响因子：
22.1
通讯作者：
Xue, Can
中科院分区：
文献类型：
--
作者：
Gu, Quan;Liao, Yusen;Xue, Can
采用无模板溶剂热法和后热处理法制备了石墨化氮化碳微球光催化剂。结构表征结果表明，所制备的样品具有与块体g-C3N4相同的组成，但呈现出具有纳米孔表面的分级微球。与块体g-C3N4相比，这些多孔微球具有更窄的禁带宽度和更低的电阻，从而可以更有效地捕获可见光，更有效地传输和分离光生电荷载流子。因此，我们观察到在可见光照射下，光催化产生H-2的速率很高，光电流响应也更强。此外，长期的光催化测试表明，所制备的纳米多孔微球对H-2的生成具有很高的稳定性。(C)2014爱思唯尔B.V.保留所有权利。
Graphitic carbon nitride microsphere photocatalysts were prepared through a template-free solvothermal approach with post-heating treatment. Structural characterization results reveal that the as-prepared sample has the same composition as bulk g-C3N4, but appears as hierarchical microspheres with nanoporous surfaces. Comparing to the bulk g-C3N4, these porous microspheres exhibit narrowed bandgap and lower resistance, which allows more effective visible-light harvesting and more efficient transport and separation of photogenerated charge carriers. Consequently, we observed high rate of photocatalytic H-2 production and stronger photocurrent responses under visible light irradiation. Further, the long-term photocatalytic test proved high stability of the prepared nanoporous microsphere for H-2 generation. (C) 2014 Elsevier B.V. All rights reserved.