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dc.contributor.authorKageshima, Yosuke
dc.contributor.authorShinagawa, Tatsuya
dc.contributor.authorKuwata, Takaaki
dc.contributor.authorNakata, Josuke
dc.contributor.authorMinegishi, Tsutomu
dc.contributor.authorTakanabe, Kazuhiro
dc.contributor.authorDomen, Kazunari
dc.date.accessioned2016-04-19T08:51:43Z
dc.date.available2016-04-19T08:51:43Z
dc.date.issued2016-04-18
dc.identifier.citationA miniature solar device for overall water splitting consisting of series-connected spherical silicon solar cells 2016, 6:24633 Scientific Reports
dc.identifier.issn2045-2322
dc.identifier.pmid27087266
dc.identifier.doi10.1038/srep24633
dc.identifier.urihttp://hdl.handle.net/10754/605858
dc.description.abstractA 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).
dc.description.sponsorshipThis work was financially supported by Grants-in-Aid for Specially Promoted Research (No. 23000009) of Japan Society for the Promotion of Science (JSPS).
dc.language.isoen
dc.publisherSpringer Nature
dc.relation.urlhttp://www.nature.com/articles/srep24633
dc.rightsThis work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
dc.titleA miniature solar device for overall water splitting consisting of series-connected spherical silicon solar cells
dc.typeArticle
dc.contributor.departmentChemical Science Program
dc.contributor.departmentKAUST Catalysis Center (KCC)
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Division
dc.identifier.journalScientific Reports
dc.eprint.versionPublisher's Version/PDF
dc.contributor.institutionDepartment of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
dc.contributor.institutionKyosemi Corporation, 949-2 Ebisu-cho, Fushimi-ku, Kyoto, 612-8201, Japan
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)
kaust.personShinagawa, Tatsuya
kaust.personTakanabe, Kazuhiro
refterms.dateFOA2018-06-13T10:24:11Z
dc.date.published-online2016-04-18
dc.date.published-print2016-07


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