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Molten salt-assisted a-axis oriented growth of Ta3N5 nanorod array with enhanced charge transport for efficient photoelectrochemical water oxidation

Abstract

Efficiently harvesting light and transporting charge are the main challenges for solar water oxidation by Ta3N5 photoanodes. Here, we discovered a facile KI molten salt route to fabricate highly oriented Ta3N5 nanorod array along [100] crystallographic direction. The size of the nanorod can be finely tuned by controlling the amount of KI flux, due to its bottom-up growth mechanism. The array structure enhances the light scattering, which is beneficial to harvest more light to make up for the light absorption anisotropy of Ta3N5. The preferred [100] growth orientation guarantees the electron migration to the substrate, and the enlarged space charge layer facilitates the hole migration to the semiconductor-liquid interface. As a result, under AM 1.5 irradiation, the onset potential of the Ta3N5 nanorod array photoanode reached 0.65 V versus reversible hydrogen electrode, and the current density reached 4.65 mA cm-2. The design concept that rationally combines the advantages of charge transport and light utilization may offer a new strategy for efficient solar energy conversion.

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Publication details

The article was received on 19 Jun 2018, accepted on 08 Aug 2018 and first published on 08 Aug 2018


Article type: Paper
DOI: 10.1039/C8CE01016A
Citation: CrystEngComm, 2018, Accepted Manuscript
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    Molten salt-assisted a-axis oriented growth of Ta3N5 nanorod array with enhanced charge transport for efficient photoelectrochemical water oxidation

    Z. Shi, Z. xu, J. Feng, H. Huang, Q. Qian, S. C. Yan and Z. Zou, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C8CE01016A

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