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Mg-doped Ta3N5 nanorod coated with a conformal CoOOH layer for water oxidation: bulk and surface dual modification of photoanodes

Abstract

The charge separation/transfer and photocorrosion are two major factors limiting the photoelectrochemical (PEC) applications of Ta3N5 photocatalyst. Herein, we have fabricated Ta3N5 single-crystal nanorods with Mg doping by flux-assisted crystal growth, aiming to shorten the charge transport distance and increase the electrical conductivity. The optimized Mg-doped Ta3N5 photoanodes exhibit an unprecedented PEC water splitting activity with an AM 1.5G photocurrent of 1.5 mA cm-2 at 1.23 VRHE. The high performance is attributed to that the bulk modification, Mg doping, can induce oxygen-impurity surface states as an effective electron trap center, thus increasing the electrical conductivity of Ta3N5 and charge separation efficiency. After a conformal surface modification of CoOOH by a simple electrodeposition method as a water oxidation electrocatalyst to improve the hole extraction and reaction kinetics, the Mg-doped Ta3N5 photoanodes afford an over 4-fold increase in photocurrent (ca.6.5 mA cm -2 at 1.23 VRHE) and about 70% retention of the initial photocurrent after 70 min irradiation at 1.0 VRHE. Our results testify that the bulk and surface co-modification is an effective route to develop the high-performance PEC water splitting device.

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Publication details

The article was received on 17 Jul 2017, accepted on 31 Aug 2017 and first published on 31 Aug 2017


Article type: Paper
DOI: 10.1039/C7TA06227C
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Mg-doped Ta3N5 nanorod coated with a conformal CoOOH layer for water oxidation: bulk and surface dual modification of photoanodes

    L. Pei, Z. xu, Z. shi, H. Zhu, S. C. Yan and Z. Zou, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA06227C

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