Show simple item record

dc.contributor.authorNurlaela, Ela
dc.contributor.authorShinagawa, Tatsuya
dc.contributor.authorQureshi, Muhammad
dc.contributor.authorDhawale, Dattatray Sadashiv
dc.contributor.authorTakanabe, Kazuhiro
dc.date.accessioned2016-02-01T13:56:38Z
dc.date.available2016-02-01T13:56:38Z
dc.date.issued2016-02-10
dc.identifier.citationTemperature dependence of electrocatalytic and photocatalytic oxygen evolution reaction rates using NiFe oxide 2016 ACS Catalysis
dc.identifier.issn2155-5435
dc.identifier.issn2155-5435
dc.identifier.doi10.1021/acscatal.5b02804
dc.identifier.urihttp://hdl.handle.net/10754/595375
dc.description.abstractThe present work compares oxygen evolution reaction (OER) in electrocatalysis and photocatalysis in aqueous solutions using nanostructured NiFeOx as catalysts. The impacts of pH and reaction temperature on the electrocatalytic and photocatalytic OER kinetics were investigated. For electrocatalysis, a NiFeOx catalyst was hydrothermally decorated on Ni foam. In 1 M KOH solution, the NiFeOx electrocatalyst achieved 10 mA cm-2 at an overpotential of 260 mV. The same catalyst was decorated on the surface of Ta3N5 photocatalyst powder. The reaction was conducted in the presence of 0.1 M Na2S2O8 as a strong electron scavenger, thus likely leading to the OER being kinetically relevant. When compared with the bare Ta3N5, NiFeOx/Ta3N5 demonstrated a 5-fold improvement in photocatalytic activity in the OER under visible light irradiation, achieving a quantum efficiency of 24 % at 480 nm. Under the conditions investigated, a strong correlation between the electrocatalytic and photocatalytic performances was identified: an improvement in electrocatalysis corresponded with an improvement in photocatalysis without altering the identity of the materials. The rate change at different pH was likely associated with electrocatalytic kinetics that accordingly influenced the photocatalytic rates. The sensitivity of the reaction rates with respective to the reaction temperature resulted in an apparent activation energy of 25 kJ mol-1 in electrocatalysis, whereas that in photocatalysis was 16 kJ mol-1. The origin of the difference in these activation energy values is likely attributed to the possible effects of temperature on the individual thermodynamic and kinetic parameters of the reaction process. The work described herein demonstrates a method of “transferring the knowledge of electrocatalysis to photocatalysis” as a strong tool to rationally and quantitatively understand the complex reaction schemes involved in photocatalytic reactions.
dc.language.isoen
dc.publisherAmerican Chemical Society (ACS)
dc.relation.urlhttp://pubs.acs.org/doi/abs/10.1021/acscatal.5b02804
dc.rightsThis document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Catalysis, 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/acscatal.5b02804.
dc.titleTemperature dependence of electrocatalytic and photocatalytic oxygen evolution reaction rates using NiFe oxide
dc.typeArticle
dc.contributor.departmentCatalysis for Energy Conversion (CatEC)
dc.contributor.departmentChemical Engineering Program
dc.contributor.departmentChemical Science Program
dc.contributor.departmentKAUST Catalysis Center (KCC)
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalACS Catalysis
dc.eprint.versionPost-print
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)
kaust.personNurlaela, Ela
kaust.personShinagawa, Tatsuya
kaust.personQureshi, Muhammad
kaust.personDhawale, Dattatray Sadashiv
kaust.personTakanabe, Kazuhiro
refterms.dateFOA2017-01-25T00:00:00Z
dc.date.published-online2016-02-10
dc.date.published-print2016-03-04


Files in this item

Thumbnail
Name:
acscatal2E5b02804.pdf
Size:
1.249Mb
Format:
PDF
Description:
Accepted Manuscript

This item appears in the following Collection(s)

Show simple item record