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Ta3N5/Co(OH)x composites as photocatalysts for photoelectrochemical water splitting

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Abstract

Ta3N5 nanotubes (NTs) were obtained from nitridation of Ta2O5 NTs, which were grown directly on Ta foil through a 2-step anodization procedure. With Co(OH)x decoration, a photocurrent density as high as 2.3 mA cm−2 (1.23 V vs. NHE) was reached under AM1.5G simulated solar light; however, the electrode suffered from photocorrosion. More stable photoelectrochemical (PEC) performance was achieved by first loading Co(OH)x, followed by loading cobalt phosphate (Co–Pi) as double co-catalysts. The Co(OH)x/Co–Pi double co-catalysts may act as a hole storage layer that slows down the photocorrosion caused by the accumulated holes on the surface of the electrode. A “waggling” appearance close to the “mouth” of Ta2O5 NTs was observed, and may indicate structural instability of the “mouth” region, which breaks into segments after nitridation and forms a top layer of broken Ta3N5 NTs. A unique mesoporous structure of the walls of the Ta3N5 NTs, which is reported here the first time, is also a result of the nitridation process. We believe that the mesoporous structure makes it difficult for the nanotubes to be fully covered by the co-catalyst layer, hence rationalizing the remaining degradation by photocorrosion.

Graphical abstract: Ta3N5/Co(OH)x composites as photocatalysts for photoelectrochemical water splitting

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Publication details

The article was received on 15 Jul 2018, accepted on 21 Oct 2018 and first published on 25 Oct 2018


Article type: Paper
DOI: 10.1039/C8PP00312B
Citation: Photochem. Photobiol. Sci., 2019, Advance Article
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    Ta3N5/Co(OH)x composites as photocatalysts for photoelectrochemical water splitting

    K. Xu, A. Chatzitakis, I. J. T. Jensen, M. Grandcolas and T. Norby, Photochem. Photobiol. Sci., 2019, Advance Article , DOI: 10.1039/C8PP00312B

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