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Controllable assembly of single/double-thin-shell g-C3N4 vesicles via a shape-selective solid-state templating method for efficient photocatalysis

Abstract

Mimicking the natural thylakoid vesicles is an effective approach for facilitating photoabsorption and charge separation over photocatalysts. However, bulk materials cannot function well with the short distance of photocarrier transport while thin-layer suffers from the preparation difficulty due to the ease of structural collapse. Herein, inspired by the the natural thylakoid vesicles, a solid-state thermolysis templating method using shape selectivity of MCM-41 and melamine precursor has been developed to assemble the stable thin-shell g-C3N4 vesicles and their heterojunctions. The relatively narrow channel of MCM-41 allows the oligomerization of melamine inside the pore but inhibits its further polymerization into melon. With increasing temperature, oligomers begin to form and migrate out of the channel and polymerize selectively on the open-up outer surface into the vesicle structure. Single- and double-thin-shell g-C3N4 vesicles as well as their heterojunctions have successfully been fabricated through templating by MCM-41, hollow MCM-41 and MOx/MCM-41 (M = Ag, Fe, Co, Cu, Ni) as evidenced by TEM. Uniform shell thickness can be precisely controlled from 17.5 to 42.1 nm. The tailored g-C3N4 vesicles exhibit enhanced photocatalytic activity and stability in the hydrogen evolution reaction which results from the enhanced photoabsorption and suppressed charge recombination. This new method is versatile for encapsulation of the secondary component including metal and metal oxides in g-C3N4.

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Publication details

The article was received on 09 Feb 2019, accepted on 12 Apr 2019 and first published on 15 Apr 2019


Article type: Paper
DOI: 10.1039/C9TA01521C
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript

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    Controllable assembly of single/double-thin-shell g-C3N4 vesicles via a shape-selective solid-state templating method for efficient photocatalysis

    L. Luo, K. Li, A. Zhang, H. Shi, G. Zhang, J. Ma, W. zhang, J. Tang, C. Song and X. Guo, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA01521C

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