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Simultaneous nanostructure and heterojunction engineering of graphitic carbon nitride via in situ Ag doping for enhanced photoelectrochemical activity

Paper ID Volume ID Publish Year Pages File Format Full-Text
44915 46375 2015 12 PDF Available
Title
Simultaneous nanostructure and heterojunction engineering of graphitic carbon nitride via in situ Ag doping for enhanced photoelectrochemical activity
Abstract

•The use of AgNO3 as a multifunctional modifier in a simple one-pot fashion is demonstrated.•Mesoporous ternary photocatalyst consists of g-C3N4 nanosheets, metallic Ag and MoS2 nanosheets.•The ternary photocatalyst is embedded with nanoscale Mott–Schottky effect.•The ternary photocatalyst exhibits improved photoelectrochemical activity.

A novel mesoporous ternary photocatalyst consisting of g-C3N4 nanosheets, metallic silver and MoS2 nanosheets is prepared using AgNO3 as a multifunctional modifier during thermal polymerization of melamine and few-layer MoS2 in a simple one-pot process. The gas bubbles from AgNO3 form an extra soft templates to in situ alter the polymerization behavior of melamine, creating thin g-C3N4 nanosheets and large porous structure that exhibit enhanced light absorption. The solution-based, soft-chemical synthesis enables homogeneous inclusion of metallic silver in the g-C3N4 nanosheets and high dispersibility of ultrathin MoS2 nanosheets in the obtained nanocomposite. In situ coupling between metallic silver and g-C3N4 nanosheets produces nanoscale Mott–Schottky effect, provides an effective channel for charge separation and transfer, and tunes energy band of the latter. More importantly, modulated energy band of g-C3N4 nanosheets synergistically expedites the separation and transfer of photogenerated electron–hole pairs at the interface of two-dimensional g-C3N4/MoS2 heterojunction. As a result, the ternary nanocomposite exhibits improved photoelectrochemical performance and photocatalytic activity under simulated sunlight irradiation compared with other reference materials. Our results provide new insights into the design and large-scale production of semiconductor photocatalyst.

Graphical abstractA novel mesoporous ternary photocatalyst consisting of g-C3N4 nanosheets, metallic silver and MoS2 nanosheets is prepared using AgNO3 as a multifunctional modifier during polymerization of melamine in a simple one-pot process. The ternary photocatalyst integrate nanoscale Mott–Schottky effect and 2D g-C3N4/MoS2 heterojunction, thereby exhibiting improved photoelectrochemical performance and photocatalytic activity.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Photocatalysis; Heterojunction; Nanosheets; Graphite-like carbon nitride; Mott–Schottky effect
First Page Preview
Simultaneous nanostructure and heterojunction engineering of graphitic carbon nitride via in situ Ag doping for enhanced photoelectrochemical activity
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 163, February 2015, Pages 611–622
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis