文献类型：期刊文献

英文题名：Three-dimensional graphene oxide cross-linked by benzidine as an efficient metal-free photocatalyst for hydrogen evolution

作者：Zhou, Xin[1];Cui, Shi-Cong[1];Liu, Jin-Gang[1]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, Shanghai 200237, Peoples R China

年份：2020

卷号：10

期号：25

起止页码：14725

外文期刊名：RSC ADVANCES

收录：;EI(收录号：20201708533513);WOS:【SCI-EXPANDED(收录号:WOS:000528740900031)】；

基金：This study was financially supported by the NSF of China (No. 21571063 to SCC, 21571062 to JGL), the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning to JGL.

语种：英文

外文关键词：Photocatalytic activity - Solar energy - Graphene - Hydrogen production

摘要：The use of low-cost photocatalysts to split water into H-2 fuel via solar energy is highly desirable for the production of clean energy and a sustainable society. Here three-dimensional graphene oxide (3DG) porous materials were prepared by cross-linking graphene oxide (GO) sheets using aromatic diamines (benzidine, 2,2 '-dimethyl-4,4 '-biphenyldiamine, 4,4 '-diaminodiphenylmethane) that reacted with the carboxyl groups of the GO sheets at room temperature. The prepared 3DG porous materials were used as efficient metal-free photocatalysts for the production of H(2)via water splitting under full-spectrum light, where the photocatalytic activity was highly dependent on the cross-linker and the 3DG reduction level. It was also found that the 3DG prepared with benzidine as the linker demonstrated a significantly higher H-2 evolution rate than the 3DGs prepared using 2,2 '-dimethyl-4,4 '-biphenyldiamine and 4,4 '-diaminodiphenylmethane as the cross-linkers. The photoactivity was further tuned by varying the mass ratio of GO to benzidine. Among the prepared 3DG materials, 3DG-3, with an intermediate C/O ratio of 1.84, exhibited the highest H-2 production rate (690 mu mol g(-1) h(-1)), which was significantly higher than the two-dimensional GO (45 mu mol g(-1) h(-1)) and the noncovalent 3DG synthesized by a hydrothermal method (128 mu mol g(-1) h(-1)). Moreover, this study revealed that the 3DG photocatalytic performance was favored by effective charge separation, while it could be further tuned by changing the reduction level. In addition, these results could prompt the preparation of other 3D materials and the application of new types of photocatalysts for H-2 evolution.