Ta3N5 photoanodes for water splitting prepared by sputtering

Yokoyama, Daisuke; Hashiguchi, Hiroshi; Maeda, Kazuhiko; Minegishi, Tsutomu; Takata, Tsuyoshi; Abe, Ryu; Kubota, Jun; Domen, Kazunari

doi:10.1016/j.tsf.2010.10.055

Cited by 136 publications

(139 citation statements)

References 26 publications

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“…To solve this problem, non-oxides such as nitrides and sulfides have been proposed, since their VB position is usually higher in energy. Unfortunately, nitrides usually suffer from poor aqueous stability [17], and cannot maintain photocatalytic activity in water over a long period of time.…”

Section: Introductionmentioning

confidence: 99%

First principles high throughput screening of oxynitrides for water-splitting photocatalysts

Lazić

Hautier

et al. 2013

Energy Environ. Sci.

335

276

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In this paper, we present a first principles high throughput screening system to search for new water-splitting photocatalysts. We use the approach to screen through nitrides and oxynitrides.Most of the known photocatalysts materials in the screened chemical space are reproduced. In addition, sixteen new materials are suggested by the screening approach as promising photocatalysts, including three binary nitrides, two ternary oxynitrides and eleven quaternary oxynitrides.

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Section: Introductionmentioning

confidence: 99%

First principles high throughput screening of oxynitrides for water-splitting photocatalysts

Lazić

Hautier

et al. 2013

Energy Environ. Sci.

335

276

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“…Various types of oxide-and (oxy)nitride-based n-type semiconductor materials, such as hematite [6][7][8], vanadate [9,10], the GaN:ZnO solid solution [11], nitrides [12,13], and oxynitirides [14,15] have been reported as photoanode materials. In the case of the photoanode, self-oxidation makes it difficult to utilize non-oxide materials.…”

Section: Introductionmentioning

confidence: 99%

Chalcopyrite Thin Film Materials for Photoelectrochemical Hydrogen Evolution from Water under Sunlight

2015

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Abstract:Copper chalcopyrite is a promising candidate for a photocathode material for photoelectrochemical (PEC) water splitting because of its high half-cell solar-to-hydrogen conversion efficiency (HC-STH), relatively simple and low-cost preparation process, and chemical stability. This paper reviews recent advances in copper chalcopyrite photocathodes. The PEC properties of copper chalcopyrite photocathodes have improved fairly rapidly: HC-STH values of 0.25% and 8.5% in 2012 and 2015, respectively. On the other hand, the onset potential remains insufficient, owing to the shallow valence band maximum mainly consisting of Cu 3d orbitals. In order to improve the onset potential, we explored substituting Cu for Ag and investigate the PEC properties of silver gallium selenide (AGSe) thin film photocathodes for varying compositions, film growth atmospheres, and surfaces. The modified AGSe photocathodes showed a higher onset potential than copper chalcopyrite photocathodes. It was demonstrated that element substitution of copper chalcopyrite can help to achieve more efficient PEC water splitting.

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“…The energy bands of Ta 3 N 5 straddle the water redox potentials 19 21)), having a conduction band too positive for H 2 evolution. Ta 3 N 5 has been widely used for both photocatalytic and PEC water splitting [22][23][24][25][26][27][28] . Various attempts have been made to increase the activity of Ta 3 N 5 by doping with foreign elements, mostly with group IA alkali metals [29][30][31] .…”

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confidence: 99%

Cobalt phosphate-modified barium-doped tantalum nitride nanorod photoanode with 1.5% solar energy conversion efficiency

et al. 2013

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Spurred by the decreased availability of fossil fuels and global warming, the idea of converting solar energy into clean fuels has been widely recognized. Hydrogen produced by photoelectrochemical water splitting using sunlight could provide a carbon dioxide lean fuel as an alternative to fossil fuels. A major challenge in photoelectrochemical water splitting is to develop an efficient photoanode that can stably oxidize water into oxygen. Here we report an efficient and stable photoanode that couples an active barium-doped tantalum nitride nanostructure with a stable cobalt phosphate co-catalyst. The effect of barium doping on the photoelectrochemical activity of the photoanode is investigated. The photoanode yields a maximum solar energy conversion efficiency of 1.5%, which is more than three times higher than that of state-of-the-art single-photon photoanodes. Further, stoichiometric oxygen and hydrogen are stably produced on the photoanode and the counter electrode with Faraday efficiency of almost unity for 100 min.

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Ta3N5 photoanodes for water splitting prepared by sputtering

Cited by 136 publications

References 26 publications

First principles high throughput screening of oxynitrides for water-splitting photocatalysts

First principles high throughput screening of oxynitrides for water-splitting photocatalysts

Chalcopyrite Thin Film Materials for Photoelectrochemical Hydrogen Evolution from Water under Sunlight

Cobalt phosphate-modified barium-doped tantalum nitride nanorod photoanode with 1.5% solar energy conversion efficiency

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