您的浏览器目前处于缩放状态,页面可能会出现错位现象,建议100%大小显示。(快捷键:Ctrl+0)

当前位置:首页 > 图像设计 > 发表快报

J. Mater. Chem. A[转正封] - 大连理工郭新闻教授、大连理工/美国宾夕法尼亚州立大学宋春山教授、伦敦大学学院唐军旺教授

发布时间: 2019-7-30 来源: RSC

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

Abstract: Mimicking natural thylakoid vesicles is an effective approach for facilitating photoabsorption and charge separation over photocatalysts. However, bulk materials cannot function well with a short photocarrier transport distance while thin-layers suffer from preparation difficulty due to the ease of structural collapse. Herein, inspired by natural thylakoid vesicles, a solid-state thermolysis templating method using the shape selectivity of MCM-41 and melamine precursor has been developed to assemble 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, and Ni) as evidenced by TEM. A 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 for 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 metals and metal oxides in g-C3N4.

客服:400-070-3060