Electrocatalytic hydrogen evolution under densely buffered neutral pH conditions

Handle URI:
http://hdl.handle.net/10754/575505
Title:
Electrocatalytic hydrogen evolution under densely buffered neutral pH conditions
Authors:
Shinagawa, Tatsuya ( 0000-0002-5240-7342 ) ; Takanabe, Kazuhiro ( 0000-0001-5374-9451 )
Abstract:
Under buffered neutral pH conditions, solute concentrations drastically influence the hydrogen evolution reaction (HER). The iR-free HER performance as a function of solute concentration was found to exhibit a volcano-shaped trend in sodium phosphate solution at pH 5, with the maximum occurring at 2 M. A detailed microkinetic model that includes calculated activity coefficients, solution resistance, and mass-transport parameters accurately describes the measured values, clarifying that the overall HER performance is predominantly governed by mass-transport of slow phosphate ions (weak acid). In the HER at the optimum concentration of approximately 2 M sodium phosphate at pH 5, our theoretical model predicts that the concentration overpotential accounts for more than half of the required overpotential. The substantial concentration overpotential would originate from the electrolyte property, suggesting that the proper electrolyte engineering will result in an improved apparent HER performances. The significance of concentration overpotential shown in the study is critical in the advancement of electrocatalysis, biocatalysis, and photocatalysis.
KAUST Department:
Physical Sciences and Engineering (PSE) Division; KAUST Catalysis Center (KCC)
Citation:
Electrocatalytic hydrogen evolution under densely buffered neutral pH conditions 2015:150818150957008 The Journal of Physical Chemistry C
Publisher:
American Chemical Society (ACS)
Journal:
The Journal of Physical Chemistry C
Issue Date:
18-Aug-2015
DOI:
10.1021/acs.jpcc.5b05295
Type:
Article
ISSN:
1932-7447; 1932-7455
Additional Links:
http://pubs.acs.org/doi/abs/10.1021/acs.jpcc.5b05295
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.authorTakanabe, Kazuhiroen
dc.date.accessioned2015-08-23T10:32:40Zen
dc.date.available2015-08-23T10:32:40Zen
dc.date.issued2015-08-18en
dc.identifier.citationElectrocatalytic hydrogen evolution under densely buffered neutral pH conditions 2015:150818150957008 The Journal of Physical Chemistry Cen
dc.identifier.issn1932-7447en
dc.identifier.issn1932-7455en
dc.identifier.doi10.1021/acs.jpcc.5b05295en
dc.identifier.urihttp://hdl.handle.net/10754/575505en
dc.description.abstractUnder buffered neutral pH conditions, solute concentrations drastically influence the hydrogen evolution reaction (HER). The iR-free HER performance as a function of solute concentration was found to exhibit a volcano-shaped trend in sodium phosphate solution at pH 5, with the maximum occurring at 2 M. A detailed microkinetic model that includes calculated activity coefficients, solution resistance, and mass-transport parameters accurately describes the measured values, clarifying that the overall HER performance is predominantly governed by mass-transport of slow phosphate ions (weak acid). In the HER at the optimum concentration of approximately 2 M sodium phosphate at pH 5, our theoretical model predicts that the concentration overpotential accounts for more than half of the required overpotential. The substantial concentration overpotential would originate from the electrolyte property, suggesting that the proper electrolyte engineering will result in an improved apparent HER performances. The significance of concentration overpotential shown in the study is critical in the advancement of electrocatalysis, biocatalysis, and photocatalysis.en
dc.language.isoenen
dc.publisherAmerican Chemical Society (ACS)en
dc.relation.urlhttp://pubs.acs.org/doi/abs/10.1021/acs.jpcc.5b05295en
dc.rightsThis document is the Accepted Manuscript version of a Published Work that appeared in final form in The Journal of Physical Chemistry C, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://pubs.acs.org/doi/abs/10.1021/acs.jpcc.5b05295.en
dc.titleElectrocatalytic hydrogen evolution under densely buffered neutral pH conditionsen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentKAUST Catalysis Center (KCC)en
dc.identifier.journalThe Journal of Physical Chemistry Cen
dc.eprint.versionPost-printen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorTakanabe, Kazuhiroen
kaust.authorShinagawa, Tatsuyaen
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