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    A miniature solar device for overall water splitting consisting of series-connected spherical silicon solar cells

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    Type
    Article
    Authors
    Kageshima, Yosuke
    Shinagawa, Tatsuya cc
    Kuwata, Takaaki
    Nakata, Josuke
    Minegishi, Tsutomu
    Takanabe, Kazuhiro cc
    Domen, Kazunari
    KAUST Department
    Catalysis for Energy Conversion (CatEC)
    Chemical Science Program
    KAUST Catalysis Center (KCC)
    Physical Science and Engineering (PSE) Division
    Date
    2016-04-18
    Online Publication Date
    2016-04-18
    Print Publication Date
    2016-07
    Permanent link to this record
    http://hdl.handle.net/10754/605858
    
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    Abstract
    A novel “photovoltaics (PV) + electrolyzer” concept is presented using a simple, small, and completely stand-alone non-biased device for solar-driven overall water splitting. Three or four spherical-shaped p-n junction silicon balls were successfully connected in series, named “SPHELAR.” SPHELAR possessed small projected areas of 0.20 (3PVs) and 0.26 cm2 (4PVs) and exhibited working voltages sufficient for water electrolysis. Impacts of the configuration on the PV module performance were carefully analyzed, revealing that a drastic increase in the photocurrent (≈20%) was attained by the effective utilization of a reflective sheet. Separate investigations on the electrocatalyst performance showed that non-noble metal based materials with reasonably small sizes (<0.80 cm2) exhibited substantial currents at the PV working voltage. By combining the observations of the PV characteristics, light management and electrocatalyst performance, solar-driven overall water splitting was readily achieved, reaching solar-to-hydrogen efficiencies of 7.4% (3PVs) and 6.4% (4PVs).
    Citation
    A miniature solar device for overall water splitting consisting of series-connected spherical silicon solar cells 2016, 6:24633 Scientific Reports
    Sponsors
    This work was financially supported by Grants-in-Aid for Specially Promoted Research (No. 23000009) of Japan Society for the Promotion of Science (JSPS).
    Publisher
    Springer Nature
    Journal
    Scientific Reports
    DOI
    10.1038/srep24633
    PubMed ID
    27087266
    Additional Links
    http://www.nature.com/articles/srep24633
    ae974a485f413a2113503eed53cd6c53
    10.1038/srep24633
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Chemical Science Program; KAUST Catalysis Center (KCC)

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