Photocatalytic water splitting: Quantitative approaches toward photocatalysis by design

Handle URI:
http://hdl.handle.net/10754/625908
Title:
Photocatalytic water splitting: Quantitative approaches toward photocatalysis by design
Authors:
Takanabe, Kazuhiro ( 0000-0001-5374-9451 )
Abstract:
A widely used term, “photocatalysis”, generally addresses photocatalytic (energetically down-hill) and photosynthetic (energetically up-hill) reactions and refers to the use of photonic energy as a driving force for chemical transformations, i.e., electron reorganization to form/break chemical bonds. Although there are many such important reactions, this contribution focuses on the fundamental aspects of photocatalytic water splitting into hydrogen and oxygen by using light from the solar spectrum, which is one of the most investigated photosynthetic reactions. Photocatalytic water splitting using solar energy is considered to be artificial photosynthesis that produces a solar fuel because the reaction mimics nature’s photosynthesis not only in its redox reaction type but also in its thermodynamics (water splitting: 1.23 eV vs. glucose formation: 1.24 eV). To achieve efficient photocatalytic water splitting, all of the parameters, though involved at different timescales and spatial resolutions, should be optimized because the overall efficiency is obtained as the multiplication of all these fundamental efficiencies. The purpose of this review article is to provide the guidelines of a concept, “photocatalysis by design”, which is the opposite of “black box screening”; this concept refers to making quantitative descriptions of the associated physical and chemical properties to determine which events/parameters have the most impact on improving the overall photocatalytic performance, in contrast to arbitrarily ranking different photocatalyst materials. First, the properties that can be quantitatively measured or calculated are identified. Second, the quantities of these identified properties are determined by performing adequate measurements and/or calculations. Third, the obtained values of these properties are integrated into equations so that the kinetic/energetic bottlenecks of specific properties/processes can be determined, and the properties can then be altered to further improve the process. Accumulation of knowledge ranging in fields from solid-state physics to electrochemistry and the use of a multidisciplinary approach to conduct measurements and modeling in a quantitative manner are required to fully understand and improve the efficiency of photocatalysis.
KAUST Department:
KAUST Catalysis Center (KCC); Physical Sciences and Engineering (PSE) Division
Citation:
Takanabe K (2017) Photocatalytic water splitting: Quantitative approaches toward photocatalysis by design. ACS Catalysis. Available: http://dx.doi.org/10.1021/acscatal.7b02662.
Publisher:
American Chemical Society (ACS)
Journal:
ACS Catalysis
Issue Date:
11-Oct-2017
DOI:
10.1021/acscatal.7b02662
Type:
Article
ISSN:
2155-5435; 2155-5435
Sponsors:
The research reported in this publication was supported by King Abdullah University of Science and Technology (KAUST). The author appreciates Dr. Angel T. Garcia-Esparza for thorough discussion on simulation data related to Figure 7.
Additional Links:
http://pubs.acs.org/doi/10.1021/acscatal.7b02662
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; KAUST Catalysis Center (KCC)

Full metadata record

DC FieldValue Language
dc.contributor.authorTakanabe, Kazuhiroen
dc.date.accessioned2017-10-19T07:10:41Z-
dc.date.available2017-10-19T07:10:41Z-
dc.date.issued2017-10-11en
dc.identifier.citationTakanabe K (2017) Photocatalytic water splitting: Quantitative approaches toward photocatalysis by design. ACS Catalysis. Available: http://dx.doi.org/10.1021/acscatal.7b02662.en
dc.identifier.issn2155-5435en
dc.identifier.issn2155-5435en
dc.identifier.doi10.1021/acscatal.7b02662en
dc.identifier.urihttp://hdl.handle.net/10754/625908-
dc.description.abstractA widely used term, “photocatalysis”, generally addresses photocatalytic (energetically down-hill) and photosynthetic (energetically up-hill) reactions and refers to the use of photonic energy as a driving force for chemical transformations, i.e., electron reorganization to form/break chemical bonds. Although there are many such important reactions, this contribution focuses on the fundamental aspects of photocatalytic water splitting into hydrogen and oxygen by using light from the solar spectrum, which is one of the most investigated photosynthetic reactions. Photocatalytic water splitting using solar energy is considered to be artificial photosynthesis that produces a solar fuel because the reaction mimics nature’s photosynthesis not only in its redox reaction type but also in its thermodynamics (water splitting: 1.23 eV vs. glucose formation: 1.24 eV). To achieve efficient photocatalytic water splitting, all of the parameters, though involved at different timescales and spatial resolutions, should be optimized because the overall efficiency is obtained as the multiplication of all these fundamental efficiencies. The purpose of this review article is to provide the guidelines of a concept, “photocatalysis by design”, which is the opposite of “black box screening”; this concept refers to making quantitative descriptions of the associated physical and chemical properties to determine which events/parameters have the most impact on improving the overall photocatalytic performance, in contrast to arbitrarily ranking different photocatalyst materials. First, the properties that can be quantitatively measured or calculated are identified. Second, the quantities of these identified properties are determined by performing adequate measurements and/or calculations. Third, the obtained values of these properties are integrated into equations so that the kinetic/energetic bottlenecks of specific properties/processes can be determined, and the properties can then be altered to further improve the process. Accumulation of knowledge ranging in fields from solid-state physics to electrochemistry and the use of a multidisciplinary approach to conduct measurements and modeling in a quantitative manner are required to fully understand and improve the efficiency of photocatalysis.en
dc.description.sponsorshipThe research reported in this publication was supported by King Abdullah University of Science and Technology (KAUST). The author appreciates Dr. Angel T. Garcia-Esparza for thorough discussion on simulation data related to Figure 7.en
dc.publisherAmerican Chemical Society (ACS)en
dc.relation.urlhttp://pubs.acs.org/doi/10.1021/acscatal.7b02662en
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/10.1021/acscatal.7b02662.en
dc.titlePhotocatalytic water splitting: Quantitative approaches toward photocatalysis by designen
dc.typeArticleen
dc.contributor.departmentKAUST Catalysis Center (KCC)en
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalACS Catalysisen
dc.eprint.versionPost-printen
kaust.authorTakanabe, Kazuhiroen
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