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Facile urea-assisted precursor pre-treatment to fabricate porous g-C3N4 nanosheets for remarkably enhanced visible-light-driven hydrogen evolution

Author:
Bai, Jirong, Yin, Chaochuang, Xu, Haiyang, Chen, Gang, Ni, Zhijiang, Wang, Zhilei, Li, Yaguang, Kang, Shifei, Zheng, Zheng, Li, Xi
Source:
Journal of colloid and interface science 2018 v.532 pp. 280-286
ISSN:
0021-9797
Subject:
active sites, carbon nitride, energy, graphene, hydrogen production, nanosheets, surface area
Abstract:
Hydrogen generation photocatalyzed by low-cost graphite carbon nitride (g-C3N4) is a fascinating and effective route to solve energy crisis, but is mainly limited by the few reactive sites, low carrier separation efficiency and mediocre visible-light utilization. In this work, these limitations were tackled through a facile eco-friendly precursor pretreatment by tuning bulk g-C3N4 into porous structure. This pretreatment restricted agglomeration in the subsequent condensation and created more porous channels for charge carrier transfer and more surface active sites for reaction. The modified g-C3N4 has larger surface area, broader visible-light response, enhanced electron migration capacity and prolonged lifetime of photogenerated carriers. These well-amended g-C3N4 nanosheets possess an average hydrogen evolution rate 5.7 times that of bulk g-C3N4. This work affords a facile, eco-friendly and scalable strategy to design or synthesize other porous materials.
Agid:
6094773