Electrolyte engineering toward efficient water splitting at mild pH

Handle URI:
http://hdl.handle.net/10754/625422
Title:
Electrolyte engineering toward efficient water splitting at mild pH
Authors:
Shinagawa, Tatsuya ( 0000-0002-5240-7342 ) ; Ng, Marcus Tze-Kiat; Takanabe, Kazuhiro ( 0000-0001-5374-9451 )
Abstract:
The development of processes for the conversion of H2O/CO2 driven by electricity generated in renewable manners is essential to achieve sustainable energy and chemical cycles, in which the electrocatalytic oxygen evolution reaction (OER) is one of the bottlenecks. In this contribution, the influences of the electrolyte molarity and identity on OER at alkaline to neutral pH were investigated at an appreciable current density of ~10 mA cm-2, revealing (1) the clear boundary of reactant switching between H2O/OH- due to the diffusion limitation of OH- and (2) the substantial contribution of the mass transport of the buffered species in buffered mild pH conditions. These findings propose a strategy of electrolyte engineering: tuning the electrolyte properties to maximize the mass-transport flux. The concept was successfully demonstrated for OER as well as overall water electrolysis in buffered mild pH conditions, shedding light on the development of practical solar fuel production systems.
KAUST Department:
KAUST Catalysis Center (KCC); Physical Sciences and Engineering (PSE) Division
Citation:
Shinagawa T, Ng MT-K, Takanabe K (2017) Electrolyte engineering toward efficient water splitting at mild pH. ChemSusChem. Available: http://dx.doi.org/10.1002/cssc.201701266.
Publisher:
Wiley-Blackwell
Journal:
ChemSusChem
Issue Date:
28-Aug-2017
DOI:
10.1002/cssc.201701266
Type:
Article
ISSN:
1864-5631
Sponsors:
The research reported in this publication was supported by King Abdullah University of Science and Technology (KAUST). Dr. Ahmed Ziani and Liga Stegenburga are acknowledged for the preparation of the CoOx RDE, and the NiMo/NF and Co/NF electrodes, respectively. The authors appreciate the kind assistance of Prof. Nikos Hadjichristidis and Keisuke Obata for the viscosity measurements.
Additional Links:
http://onlinelibrary.wiley.com/doi/10.1002/cssc.201701266/abstract
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; KAUST Catalysis Center (KCC)

Full metadata record

DC FieldValue Language
dc.contributor.authorShinagawa, Tatsuyaen
dc.contributor.authorNg, Marcus Tze-Kiaten
dc.contributor.authorTakanabe, Kazuhiroen
dc.date.accessioned2017-08-30T11:40:25Z-
dc.date.available2017-08-30T11:40:25Z-
dc.date.issued2017-08-28en
dc.identifier.citationShinagawa T, Ng MT-K, Takanabe K (2017) Electrolyte engineering toward efficient water splitting at mild pH. ChemSusChem. Available: http://dx.doi.org/10.1002/cssc.201701266.en
dc.identifier.issn1864-5631en
dc.identifier.doi10.1002/cssc.201701266en
dc.identifier.urihttp://hdl.handle.net/10754/625422-
dc.description.abstractThe development of processes for the conversion of H2O/CO2 driven by electricity generated in renewable manners is essential to achieve sustainable energy and chemical cycles, in which the electrocatalytic oxygen evolution reaction (OER) is one of the bottlenecks. In this contribution, the influences of the electrolyte molarity and identity on OER at alkaline to neutral pH were investigated at an appreciable current density of ~10 mA cm-2, revealing (1) the clear boundary of reactant switching between H2O/OH- due to the diffusion limitation of OH- and (2) the substantial contribution of the mass transport of the buffered species in buffered mild pH conditions. These findings propose a strategy of electrolyte engineering: tuning the electrolyte properties to maximize the mass-transport flux. The concept was successfully demonstrated for OER as well as overall water electrolysis in buffered mild pH conditions, shedding light on the development of practical solar fuel production systems.en
dc.description.sponsorshipThe research reported in this publication was supported by King Abdullah University of Science and Technology (KAUST). Dr. Ahmed Ziani and Liga Stegenburga are acknowledged for the preparation of the CoOx RDE, and the NiMo/NF and Co/NF electrodes, respectively. The authors appreciate the kind assistance of Prof. Nikos Hadjichristidis and Keisuke Obata for the viscosity measurements.en
dc.publisherWiley-Blackwellen
dc.relation.urlhttp://onlinelibrary.wiley.com/doi/10.1002/cssc.201701266/abstracten
dc.rightsThis is the peer reviewed version of the following article: Electrolyte engineering toward efficient water splitting at mild pH, which has been published in final form at http://doi.org/10.1002/cssc.201701266. This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.en
dc.subjectEnergy conversionen
dc.subjectOxygen evolutionen
dc.subjectElectrocatalysisen
dc.subjectHeterogeneous Catalysisen
dc.subjectElectrolyte Engineeringen
dc.titleElectrolyte engineering toward efficient water splitting at mild pHen
dc.typeArticleen
dc.contributor.departmentKAUST Catalysis Center (KCC)en
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalChemSusChemen
dc.eprint.versionPost-printen
kaust.authorShinagawa, Tatsuyaen
kaust.authorNg, Marcus Tze-Kiaten
kaust.authorTakanabe, Kazuhiroen
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