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一种用于增强光催化析氢性能的碳点修饰g-CN的简便水热合成方法。

A facile hydrothermal synthesis of carbon dots modified g-CN for enhanced photocatalytic H-evolution performance.

作者信息

Wang Xuefei, Cheng Jingjing, Yu Huogen, Yu Jiaguo

机构信息

School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan 430070, PR China.

出版信息

Dalton Trans. 2017 May 16;46(19):6417-6424. doi: 10.1039/c7dt00773f.

Abstract

Carbon dots (CDs)/g-CN is a promising photocatalyst to split water for H production; however, the synthesis of CDs/g-CN is usually rigorous and involves multiple steps, which limits its practical application. In this study, a facile hydrothermal approach was developed to prepare CDs/g-CN photocatalysts using l-ascorbic acid and g-CN as the precursors. Upon in situ thermal polymerization of l-ascorbic acid on the g-CN surface, the carbon dots were homogeneously and solidly modified on the g-CN surface. The CDs/g-CN photocatalysts showed higher photocatalytic performance for H production than g-CN under UV light irradiation using lactic acid as the sacrificial agent. The improved photocatalytic performance of CDs/g-CN was mainly attributed to rapid interfacial charge transfer. After a Pt co-catalyst was loaded, the Pt-CDs/g-CN catalyst formed exhibited a further improved photocatalytic performance for H production and could even split pure water to produce H. Considering our present economic and facile synthetic approach for the modification of carbon dots on the surface of g-CN photocatalysts, the as-prepared CDs/g-CN photocatalysts will be promising for practical use in water splitting.

摘要

碳点(CDs)/石墨相氮化碳(g-CN)是一种很有前景的用于光解水制氢的光催化剂;然而,CDs/g-CN的合成通常较为苛刻且涉及多个步骤,这限制了其实际应用。在本研究中,开发了一种简便的水热法,以l-抗坏血酸和g-CN为前驱体制备CDs/g-CN光催化剂。通过l-抗坏血酸在g-CN表面原位热聚合,碳点均匀且牢固地修饰在g-CN表面。在以乳酸为牺牲剂的紫外光照射下,CDs/g-CN光催化剂比g-CN表现出更高的光催化产氢性能。CDs/g-CN光催化性能的提高主要归因于快速的界面电荷转移。负载Pt助催化剂后,形成的Pt-CDs/g-CN催化剂对产氢表现出进一步提高的光催化性能,甚至可以光解纯水制氢。考虑到我们目前用于在g-CN光催化剂表面修饰碳点的经济且简便的合成方法,所制备的CDs/g-CN光催化剂在水分解的实际应用中具有广阔前景。

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