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    A Stand-Alone Module for Solar-Driven H2 Production Coupled with Redox-Mediated Sulfide Remediation

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    Name:
    KO%20190702_EnergyTech%20Demo%20H2S.pdf
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    Description:
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    Type
    Article
    Authors
    Obata, Keisuke cc
    Shinohara, Yuuki
    Tanabe, Shinichi
    Waki, Ichitaro
    Kotsovos, Konstantinos
    Ohkawa, Kazuhiro cc
    Takanabe, Kazuhiro cc
    KAUST Department
    Catalysis for Energy Conversion (CatEC)
    Chemical Science Program
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Electrical Engineering Program
    KAUST Catalysis Center (KCC)
    Physical Science and Engineering (PSE) Division
    Date
    2019-08-08
    Embargo End Date
    2020-08-08
    Permanent link to this record
    http://hdl.handle.net/10754/662420
    
    Metadata
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    Abstract
    Efficient electrochemical devices are required to convert electric power by intermittent renewable energy sources into a chemical form. The choice of combination in reduction–oxidation reactions can vary depending on the target, which provides different thermodynamics and kinetics. A promising approach for H2 production coupled with sulfide remediation is demonstrated to utilize the intermediate redox media. H2 is produced on the cathode, and soluble redox ions in a reduced form are oxidized on the anode. The ions are then transferred to a separate reactor to oxidize the sulfide ions via a homogeneous reaction, and the reduced redox ions are recirculated. A solar-driven redox photovoltaic-electrochemical (PV-EC) system is operated as a stand-alone module and is composed of Cu(In,Ga)(S,Se)2 (CIGS) PVs and EC cells in series and operated under natural solar irradiation. A unique EC cell is established in an aqueous-phase membraneless configuration at ambient temperature, and a cathode is decorated with a semipermeable CrOx-based nanomembrane. This allows for selective H2 evolution without causing Fe redox reduction. Remaining issues associated with the stability of the CrOx permselective layer on the cathode are also discussed, which are associated with the formation constant of a soluble metal complex in the presence of ligand counterions.
    Citation
    Obata, K., Shinohara, Y., Tanabe, S., Waki, I., Kotsovos, K., Ohkawa, K., & Takanabe, K. (2019). A Stand-Alone Module for Solar-Driven H2 Production Coupled with Redox-Mediated Sulfide Remediation. Energy Technology, 7(10), 1900575. doi:10.1002/ente.201900575
    Sponsors
    The research reported in this work was supported by the King Abdullah University of Science and Technology and Japan Cooperation Center Petroleum under “Technical collaboration for H2 production by splitting H2S with sunlight”. CIGS-PV module was provided by Solar Frontier K.K.
    Publisher
    Wiley
    Journal
    Energy Technology
    DOI
    10.1002/ente.201900575
    Additional Links
    https://onlinelibrary.wiley.com/doi/abs/10.1002/ente.201900575
    ae974a485f413a2113503eed53cd6c53
    10.1002/ente.201900575
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Electrical and Computer Engineering Program; Chemical Science Program; KAUST Catalysis Center (KCC); Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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