Promoted photoinduced charge separation and directional electron transfer over dispersible xanthene dyes sensitized graphene sheets for efficient solar H2 evolution
Promoted photoinduced charge separation and directional electron transfer over dispersible xanthene dyes sensitized graphene sheets for efficient solar H2 evolution
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DOI：
10.1016/j.ijhydene.2012.11.124
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发表时间：
2013-02-19
影响因子：
7.2
通讯作者：
Lu, Gongxuan
中科院分区：
文献类型：
--
作者：
Min, Shixiong;Lu, Gongxuan
石墨烯薄膜的定向电子转移和有效的电荷分离为提高光电转换和光催化效率提供了一条鼓舞人心的途径。在这里，我们论证了利用可分散的石墨烯薄膜作为高效的电子转移载体和催化剂支架构建高性能的染料敏化析氢体系的可行性。在所研究的X染料敏化析氢催化剂中，孟加拉玫瑰(RB)敏化石墨烯修饰铂的光催化剂活性最高，在550 nm波长处表现出最高的表观量子效率(AQE)18.5%，对析氢具有较高的长期稳定性。可分散的石墨烯薄膜不仅能有效地从被激发的染料中捕获电子，然后将它们转移到修饰的催化剂上，以较小的能量损失改善电荷分离，而且为高度分散的具有更多活性中心的催化剂纳米粒子提供了大的界面，从而显著提高了比氧化石墨(GO)和多壁碳纳米管(MWCNTs)更高的析氢效率。这项工作为开发高效的太阳能光催化体系提供了一种潜在的策略，并为通过将分散的石墨烯与高效的染料和放氢催化剂有效地协同结合来研究光致电子转移的机理提供了新的见解。版权所有(C)2012，氢能出版有限责任公司。爱思唯尔有限公司出版。保留所有权利。
Directional electron transfer and effective charge separation facilitated by graphene sheets have provided an inspiring approach to enhance the efficiencies of photoelectric conversion and photocatalysis. Herein, we demonstrated the feasibility of constructing a high-performance of the dye-sensitized H-2 evolution system using dispersible graphene sheets as both efficient electron transfer carrier and catalyst scaffold. Among the xanthene dyes sensitized H-2 evolution catalysts in this study, photocatalyst of Rose Bengal (RB) sensitized graphene decorated with Pt is the most active one and exhibits the highest apparent quantum efficiency (AQE) of 18.5% at wavelength of 550 nm and rather long-term stability for H-2 evolution. Dispersible graphene sheets can not only capture electrons from the excited dye and then transfer them to the decorated catalysts efficiently for improving charge separation with a small energy loss, but also afford large interfaces for highly dispersing catalyst nanoparticles with more active sites, thereby significantly enhancing the H-2 evolution efficiency than graphite oxide (GO) and multiwall carbon nanotubes (MWCNTs). This work proposes a potential strategy to develop efficient photocatalytic systems for solar-energy-conversion and provides a new insight into mechanistic study of photoinduced electron transfer by effective synergetic combination of dispersible graphene sheets with an efficient dye and a H-2 evolution catalyst. Copyright (C) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.