Photophysics and electrochemistry relevant to photocatalytic water splitting involved at solid–electrolyte interfaces

Handle URI:
http://hdl.handle.net/10754/622328
Title:
Photophysics and electrochemistry relevant to photocatalytic water splitting involved at solid–electrolyte interfaces
Authors:
Shinagawa, Tatsuya ( 0000-0002-5240-7342 ) ; Cao, Zhen; Cavallo, Luigi ( 0000-0002-1398-338X ) ; Takanabe, Kazuhiro ( 0000-0001-5374-9451 )
Abstract:
Direct photon to chemical energy conversion using semiconductor-electrocatalyst-electrolyte interfaces has been extensively investigated for more than a half century. Many studies have focused on screening materials for efficient photocatalysis. Photocatalytic efficiency has been improved during this period but is not sufficient for industrial commercialization. Detailed elucidation on the photocatalytic water splitting process leads to consecutive six reaction steps with the fundamental parameters involved: The photocatalysis is initiated involving photophysics derived from various semiconductor properties (1: photon absorption, 2: exciton separation). The generated charge carriers need to be transferred to surfaces effectively utilizing the interfaces (3: carrier diffusion, 4: carrier transport). Consequently, electrocatalysis finishes the process by producing products on the surface (5: catalytic efficiency, 6: mass transfer of reactants and products). Successful photocatalytic water splitting requires the enhancement of efficiency at each stage. Most critically, a fundamental understanding of the interfacial phenomena is highly desired for establishing "photocatalysis by design" concepts, where the kinetic bottleneck within a process is identified by further improving the specific properties of photocatalytic materials as opposed to blind material screening. Theoretical modeling using the identified quantitative parameters can effectively predict the theoretically attainable photon-conversion yields. This article provides an overview of the state-of-the-art theoretical understanding of interfacial problems mainly developed in our laboratory. Photocatalytic water splitting (especially hydrogen evolution on metal surfaces) was selected as a topic, and the photophysical and electrochemical processes that occur at semiconductor-metal, semiconductor-electrolyte and metal-electrolyte interfaces are discussed.
KAUST Department:
KAUST Catalysis Center (KCC); Physical Sciences and Engineering (PSE) Division
Citation:
Shinagawa T, Cao Z, Cavallo L, Takanabe K (2016) Photophysics and electrochemistry relevant to photocatalytic water splitting involved at solid–electrolyte interfaces. Journal of Energy Chemistry. Available: http://dx.doi.org/10.1016/j.jechem.2016.07.007.
Publisher:
Elsevier BV
Journal:
Journal of Energy Chemistry
Issue Date:
4-Aug-2016
DOI:
10.1016/j.jechem.2016.07.007
Type:
Article
ISSN:
2095-4956
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.authorCao, Zhenen
dc.contributor.authorCavallo, Luigien
dc.contributor.authorTakanabe, Kazuhiroen
dc.date.accessioned2017-01-02T09:08:26Z-
dc.date.available2017-01-02T09:08:26Z-
dc.date.issued2016-08-04en
dc.identifier.citationShinagawa T, Cao Z, Cavallo L, Takanabe K (2016) Photophysics and electrochemistry relevant to photocatalytic water splitting involved at solid–electrolyte interfaces. Journal of Energy Chemistry. Available: http://dx.doi.org/10.1016/j.jechem.2016.07.007.en
dc.identifier.issn2095-4956en
dc.identifier.doi10.1016/j.jechem.2016.07.007en
dc.identifier.urihttp://hdl.handle.net/10754/622328-
dc.description.abstractDirect photon to chemical energy conversion using semiconductor-electrocatalyst-electrolyte interfaces has been extensively investigated for more than a half century. Many studies have focused on screening materials for efficient photocatalysis. Photocatalytic efficiency has been improved during this period but is not sufficient for industrial commercialization. Detailed elucidation on the photocatalytic water splitting process leads to consecutive six reaction steps with the fundamental parameters involved: The photocatalysis is initiated involving photophysics derived from various semiconductor properties (1: photon absorption, 2: exciton separation). The generated charge carriers need to be transferred to surfaces effectively utilizing the interfaces (3: carrier diffusion, 4: carrier transport). Consequently, electrocatalysis finishes the process by producing products on the surface (5: catalytic efficiency, 6: mass transfer of reactants and products). Successful photocatalytic water splitting requires the enhancement of efficiency at each stage. Most critically, a fundamental understanding of the interfacial phenomena is highly desired for establishing "photocatalysis by design" concepts, where the kinetic bottleneck within a process is identified by further improving the specific properties of photocatalytic materials as opposed to blind material screening. Theoretical modeling using the identified quantitative parameters can effectively predict the theoretically attainable photon-conversion yields. This article provides an overview of the state-of-the-art theoretical understanding of interfacial problems mainly developed in our laboratory. Photocatalytic water splitting (especially hydrogen evolution on metal surfaces) was selected as a topic, and the photophysical and electrochemical processes that occur at semiconductor-metal, semiconductor-electrolyte and metal-electrolyte interfaces are discussed.en
dc.publisherElsevier BVen
dc.subjectElectrocatalysisen
dc.subjectHydrogen evolutionen
dc.subjectInterfaceen
dc.subjectModelingen
dc.subjectPhotocatalysisen
dc.subjectWater splittingen
dc.titlePhotophysics and electrochemistry relevant to photocatalytic water splitting involved at solid–electrolyte interfacesen
dc.typeArticleen
dc.contributor.departmentKAUST Catalysis Center (KCC)en
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalJournal of Energy Chemistryen
kaust.authorShinagawa, Tatsuyaen
kaust.authorCao, Zhenen
kaust.authorCavallo, Luigien
kaust.authorTakanabe, Kazuhiroen
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