A Stand-Alone Module for Solar-Driven H2 Production Coupled with Redox-Mediated Sulfide Remediation
Type
ArticleAuthors
Obata, Keisuke
Shinohara, Yuuki
Tanabe, Shinichi
Waki, Ichitaro
Kotsovos, Konstantinos
Ohkawa, Kazuhiro

Takanabe, Kazuhiro

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
2019-08-08Embargo End Date
2020-08-08Permanent link to this record
http://hdl.handle.net/10754/662420
Metadata
Show full item recordAbstract
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.201900575Sponsors
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
WileyJournal
Energy TechnologyAdditional Links
https://onlinelibrary.wiley.com/doi/abs/10.1002/ente.201900575ae974a485f413a2113503eed53cd6c53
10.1002/ente.201900575