Efficient water cleavage with visible light by a system mimicking photosystem II

Kaneko, Masao; Yao, Guang-Jun; Kira, Akira

doi:10.1039/c39890001338

Cited by 18 publications

(6 citation statements)

References 4 publications

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“…However, in practice, elemental sulfur or polysulfide are usually the oxidation products . By applying a Nafion film that adsorbs a Ru complex as the OER cocatalyst, photoinduced holes have been rapidly harvested at the CdS surface and passed on for O 2 evolution . The potentials of the VB edge of GaP (E g = 2.3 eV) is almost equal to the standard OER potential, but GaP can nevertheless function as a photoanode for water oxidation in neutral or basic water.…”

Section: Photoanodes For Water Splittingmentioning

confidence: 99%

Solar Water Splitting Cells

et al. 2010

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earned a B.S. degree in chemistry from the University of Dayton in 2001 and as an undergraduate worked on conductive polymer syntheses at the Air Force Research Laboratory at Wright Patterson Air Force Base. He completed an M.S. degree in 2004 and Ph.D. degree in 2008 at Portland State University and joined the Lewis group at Caltech in 2008. He is currently an NSF-ACCF postdoctoral fellow (2009) and has been studying the electrical characteristics of inorganic semiconductors in contact with conductive polymers. His research interests include molecular semiconductors for solar energy conversion, porphyrin macrocycles for optoelectronic applications, and catalyst materials for photoelectrolysis. Emily L. Warren received a B.S. in chemical engineering at Cornell University in 2005. She received an M.Phil in Engineering for Sustainable Development from Cambridge University in 2006. She is currently a graduate student in Chemical Engineering at the California Institute of Technology. Her research interests include semiconductor photoelectrochemistry, solar energy conversion, and semiconductor nanowires. She is currently a graduate student in Chemical Engineering at the California Institute of Technology, working under Nathan S. Lewis. James R. McKone is in his third year of graduate studies in the Division of Chemistry and Chemical Engineering at the California Institute of Technology, working under Nathan S. Lewis and Harry B. Gray. In 2008 he graduated from Saint Olaf College with a Bachelor of Arts degree, double-majoring in music and chemistry. His current research focuses on semiconductor-coupled heterogeneous catalysis of the hydrogen evolution reaction using mixtures of earth-abundant transition metals. Shannon W. Boettcher earned his B.A. degree in chemistry from the University of Oregon, Eugene (2003), and, working with Galen Stucky, his Ph.D. in Inorganic Chemistry from the University of California, Santa Barbara (2008). Following postdoctoral work with Nate Lewis and Harry Atwater at the California Institute of Technology (2008-2010), he returned to the University of Oregon to join the faculty as an Assistant Professor. His research interests span synthesis and physical measurement with the goal of designing and understanding solid-state inorganic material architectures for use in solar-energy conversion and storage.

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Section: Photoanodes For Water Splittingmentioning

confidence: 99%

Solar Water Splitting Cells

et al. 2010

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“…Although narrower gap semiconductors thus appear to be obvious candidates for absorption of more of the visible spectrum, common intermediate-gap semiconductors such as CdS and CdSe are unstable under water oxidation conditions because of the facile oxidation of sulfides or selenides. 25 Coating CdS or CdSe with conductive polymers, catalysts, or oxides can slow its degradation, [26][27][28][29][30] but to date a suitable solution to this challenge has not been established.…”

Section: Direct Photocatalytic Water Splittingmentioning

confidence: 99%

“…101 Whether with crystalline, amorphous, or molecular catalysts, photoanodes with greater absorption in the visible are needed, which should refocus efforts onto the development of composite structures designed to protect oxidatively less robust materials against degradation. [26][27][28][29][30] This general approach is modular and therefore conducive to stepwise evolution as photoanodes with greater light harvesting capabilities are developed, or better redox catalysts that can be interfaced with such anodes emerge.…”

Section: Composite Co-pi/semiconductor Photoanodes For Pec Solar Wate...mentioning

confidence: 99%

Composite photoanodes for photoelectrochemical solar water splitting

Sun

Zhong

Gamelin

2010

Energy Environ. Sci.

268

186

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Photoelectrochemical (PEC) water splitting is an attractive approach to capturing and storing the earth's abundant solar energy influx. The challenging four-electron water-oxidation half-cell reaction has hindered this technology, giving rise to slow water oxidation kinetics at the photoanode surfaces relative to competitive loss processes. In this perspective, we review recent efforts to improve PEC efficiencies by modification of semiconductor photoanode surfaces with water-oxidation catalysts that can operate at low overpotentials. This approach allows separation of the tasks of photon absorption, charge separation, and surface catalysis, allowing each to be optimized independently. In particular, composite photoanodes marrying nanocrystalline and molecular/non-crystalline components provide flexibility in adjusting the properties of each component, but raise new challenges in interfacial chemistries.

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“…The polymer-coated electrode [1] has been extensively studied because of its potential applications in sensors [2], electrocatalysts [3,4], electrosyntheses [5], molecular electronics [6], energy conversion systems [7,8] and immobilization of enzymes [9]. It has also been employed for studying the electron transfer mechanism of the redox moieties involved in supramolecular systems [10][11][12][13] relevant to biological electron transport as well as electric and photoelectric functional devices [14].…”

Section: Introductionmentioning

confidence: 99%

Electron transfer in the redox reaction of cobalt tetraphenylporphyrin incorporated in a Nafion film

Zhao

Zhang

Kaneko

2000

J. Porphyrins Phthalocyanines

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Potential step chronoamperospectrometry (PSCAS) was carried out to analyze electron transfer in the redox reaction processes of 5,10,15,20-tetraphenylporphyrinatocobalt(II) ( Co II TPP (-2)) incorporated in a Nafion film. The reactions of Co II TPP (-2) to [ Co III TPP (-2)]+ and of [ Co III TPP (-2)]+ to Co II TPP (-2) took place through a diffusion mechanism, as confirmed by the first-order initial reaction rate with respect to the complex concentration in the matrix. However, the reaction of [ Co III TPP (-2)]+ to [ Co III TPP (-1)]2+ occurred by an electron-hopping mechanism, as confirmed by the second-order initial reaction rate with respect to the complex concentration. The fraction of electroactive complex (Rct) increased with the sample time after the potential step until it reached saturation. In the reactions of Co II TPP (-2) to [ Co III TPP (-2)]+ and of [ Co III TPP (-2)]+ to Co II TPP (-2), Rct approached 1.0, while in the reaction of [ Co III TPP (-2)]+ to [ Co III TPP (-1)]2+, only about 0.3 was reached. The apparent diffusion coefficient (Dapp) decreased in the order of [ Co III TPP (-2)]+ to Co II TPP (-2) > Co II TPP (-2) to [ Co III TPP (-2)]+>[ Co III TPP (-2)]+ to [ Co III TPP (-1)]2+. The different behavior of these redox reactions was ascribed to the microenvironment of the redox species in the matrix, interaction of the redox centers, especially the product with the framework, and counter ion migration.

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Efficient water cleavage with visible light by a system mimicking photosystem II

Cited by 18 publications

References 4 publications

Solar Water Splitting Cells

Solar Water Splitting Cells

Composite photoanodes for photoelectrochemical solar water splitting

Electron transfer in the redox reaction of cobalt tetraphenylporphyrin incorporated in a Nafion film

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