Fast One-Pot Synthesis of MoS2/Crumpled Graphene p鈥搉 Nanonjunctions for Enhanced Photoelectrochemical Hydrogen Production

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• 作者：Francesco Carraro ; Laura Calvillo ; Mattia Cattelan ; Marco Favaro ; Marcello Righetto ; Silvia Nappini ; Igor P铆拧 ; Ver贸nica Celorrio ; David J. Ferm铆n ; Alessandro Martucci ; Stefano Agnoli ; Gaetano Granozzi
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：November 25, 2015
• 年：2015
• 卷：7
• 期：46
• 页码：25685-25692
• 全文大小：515K
• ISSN：1944-8252

文摘

Aerosol processing enables the preparation of hierarchical graphene nanocomposites with special crumpled morphology in high yield and in a short time. Using modular insertion of suitable precursors in the starting solution, it is possible to synthesize different types of graphene-based materials ranging from heteroatom-doped graphene nanoballs to hierarchical nanohybrids made up by nitrogen-doped crumpled graphene nanosacks that wrap finely dispersed MoS₂ nanoparticles. These materials are carefully investigated by microscopic (SEM, standard and HR TEM), diffraction (grazing incidence X-ray diffraction (GIXRD)) and spectroscopic (high resolution photoemission, Raman and UV鈭抳isible spectroscopy) techniques, evidencing that nitrogen dopants provide anchoring sites for MoS₂ nanoparticles, whereas crumpling of graphene sheets drastically limits aggregation. The activity of these materials is tested toward the photoelectrochemical production of hydrogen, obtaining that N-doped graphene/MoS₂ nanohybrids are seven times more efficient with respect to single MoS₂ because of the formation of local p鈥搉 MoS₂/N-doped graphene nanojunctions, which allow an efficient charge carrier separation.