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

Xiao Jun Lv, Wen Fu Fu, Hai Xin Chang, Hao Zhang, Jin Sheng Cheng, Gui Ju Zhang, Yang Song, Chun Yan Hu, Jing Hong Li

    Research output: Contribution to journalArticlepeer-review

    172 Citations (Scopus)

    Abstract

    Semiconductor nanoparticle/graphene composite photocatalysts containing semiconductor CdS or TiO 2 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.

    Original languageEnglish
    Pages (from-to)1539-1546
    Number of pages8
    JournalJournal of Materials Chemistry
    Volume22
    Issue number4
    DOIs
    Publication statusPublished - 2012 Jan 28

    ASJC Scopus subject areas

    • Chemistry(all)
    • Materials Chemistry

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