Journal
CATALYSIS SCIENCE & TECHNOLOGY
Volume 11, Issue 5, Pages 1874-1880Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0cy02094j
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Funding
- National Natural Science Foundation of China [51672047, 21707173]
- Youth Talent Support Program of Fujian Province [00387077]
- Natural Science Foundation of Fujian Province [2019J01648]
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In this study, a highly efficient metal-free photocatalyst was prepared using a UV reduction method, which combined reduced graphene oxide with covalent triazine-based frameworks to enhance visible light absorption, reductive ability, and separation rate of photoinduced carriers. The modification of reduced graphene oxide improved the photocatalyst's performance, providing a low-cost and high-efficient material for clean energy production.
Photocatalytic H-2 production via water splitting has emerged as an eco-friendly and green technology to efficiently utilize solar energy. Developing visible light active photocatalysts, especially the metal-free ones, is crucial to access this technology considering their economic and environmental benefits. Hence, a facile UV reduction method was adopted to fabricate a highly active metal-free photocatalyst by modifying covalent triazine-based frameworks (CTFs) with reduced graphene oxide (rGO). The optimized CTF composite with 2 wt% rGO exhibited a 4.3-fold activity enhancement compared with pristine CTFs, showing a prime H-2 evolution efficiency of 894 mu mol g(-1) h(-1). The contributions of rGO to the photocatalytic system and the interaction between rGO and CTFs were thoroughly studied. The modification of rGO endowed the photocatalyst with improved visible-light absorption, stronger reductive ability, and faster separation rate of photoinduced carriers. Moreover, the covalent C-O-C bond formed in the two components facilitates the directional transfer of photoinduced electrons. A low-cost and robust photocatalyst for clean energy production is constructed in this work, providing inspirations for the design and fabrication of metal-free photocatalytic materials with superior performance.
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