Hydrogen evolution from water using semiconductor nanoparticle/graphene composite photocatalysts without noble metals

Autor:	Haixin Chang, Wen-Fu Fu, Gui Ju Zhang, Jin Sheng Cheng, Hao Zhang, Jinghong Li, Chun Yan Hu, Yang Song, Xiao-Jun Lv
Rok vydání:	2012
Předmět:	Photocurrent Materials science Graphene business.industry Composite number chemistry.chemical_element Nanotechnology General Chemistry law.invention Semiconductor chemistry law Reagent Excited state Materials Chemistry Photocatalysis Platinum business
Zdroj:	J. Mater. Chem.. 22:1539-1546
ISSN:	1364-5501 0959-9428
Popis:	Semiconductor nanoparticle/graphene composite photocatalysts containing semiconductor CdS or TiO2 nanoparticles are fabricated by one-pot solution methods and their structures are characterized. The photocatalytic hydrogen-generating capabilities of the composite photocatalysts are investigated in the presence of sacrificial reagent and compared with those of the same semiconductor materials with platinum as a co-catalyst under the same conditions. The results obtained by the measurements of time-resolved emission spectra, photocurrent generated response and electrochemical impedance spectra revealed that graphene attached to semiconductor surfaces can efficiently accept and transport electrons from the excited semiconductor, suppressing charge recombination and improving interfacial charge transfer processes. The semiconductor nanoparticle/graphene photocatalysts displayed higher activity for photocatalytic hydrogen evolution, which can be compared with the hydrogen-generating efficiency of systems containing the well-known Pt co-catalyst. This work provides an inexpensive means of harnessing solar energy to achieve highly efficient hydrogen evolution without noble metals.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::61b390f87bd6125afd9f8daae65e05a8 https://doi.org/10.1039/c1jm14502a Zobrazit plný text záznamu