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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Fang, Xi -Ya
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (3/3 displayed)
- 2017Simple fabrication of zeolitic imidazolate framework ZIF-8/polymer composite beads by phase inversion method for efficient oil sorptioncitations
- 2016Solar water oxidation by multicomponent TaON photoanodes functionalized with nickel oxidecitations
- 2016Highly dispersed cobalt oxide on TaON as efficient photoanodes for long-term solar water splittingcitations
Places of action
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article
Highly dispersed cobalt oxide on TaON as efficient photoanodes for long-term solar water splitting
Abstract
<p>Photoelectrochemical water splitting into H<sub>2</sub> and O<sub>2</sub> over a semiconductor-based photocatalyst offers a promising way to achieve the sustainable harvesting and storage of solar energy. However, short diffusion lengths and inefficient separation of the charge carriers in the semiconductors following light absorption result in fast recombination of holes and electrons and eventually poor performance. Herein, we address this problem by integrating an efficient and robust water oxidation catalyst, cobalt oxide (CoO<sub>x</sub>), into screen-printed TaON photoanodes premodified with TiO<sub>2</sub> coatings for better stability. SEM, TEM, and ICP-MS analysis of the Co deposits and electrochemical techniques were used to demonstrate the advantages provided by the photoassisted CoO<sub>x</sub> electrodeposition method. Specifically, this method allows the selective and facile functionalization of the TiO<sub>2</sub>-TaON surface with a uniform layer of near-(hemi)spherical CoO<sub>x</sub> particles having a diameter of 5-15 nm. In comparison to the TiO<sub>2</sub>-TaON photoanodes, the optimized CoO<sub>x</sub>/TiO<sub>2</sub>-TaON configuration provides an enhancement in the photocurrent densities of up to 2 orders of magnitude and a substantial improvement in the long-term stability on testing in borate buffer solutions (pH 9.2). The highest oxidative photocurrent density of 0.7 mA cm<sup>-2</sup> was achieved with CoO<sub>x</sub>/TiO<sub>2</sub>-TaON under visible light irradiation (λ >400 nm; 100 mW cm<sup>-2</sup>) at 1.2 V vs reversible hydrogen electrode, and the system remained stable for at least 24 h. The Co loading in the best-performing photoanode is ca. 0.1 wt % with respect to TaON; higher and lower loadings result in poorer photocatalytic activity and stability. Comparisons of the performance of CoO<sub>x</sub>/TiO<sub>2</sub>-TaON with other representative inorganic water photoelectrooxidation systems are provided and discussed.</p>