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NH3‑Assisted Chloride Flux-Coating Method for Direct Fabrication of Visible-Light-Responsive SrNbO2N Crystal Layers

Abstract

Perovskite-type SrNbO2N crystal layers were prepared on niobium substrates by using an NH3-assisted chloride flux-coating method. The optimization of synthesis parameters (holding temperature and strontium source:flux molar ratio) was performed using the NaCl-KCl flux. By choosing the optimal synthesis conditions, platelet SrNbO2N crystals were grown over the entire substrate surface, and each SrNbO2N platelet has a single-crystalline structure in a cubic symmetry. The optimal crystal layer possesses a well-adhered SrNbO¬2N/NbNx/Nb structure and absorbed photons with wavelengths up to 680 nm. In addition, the optimal SrNbO¬2N/NbNx photoelectrode was used for photoelectrochemical water oxidation (2H2O → 4H+ + 4e− + O2↑), as one half of the water splitting reaction. A photocurrent density of 113 μA·cm−2 at 1.23 VRHE was recorded on the SrNbO¬2N/NbNx electrode without any additional co-catalyst loading and treatment under simulated sunlight, due to the higher crystallinity of SrNbO¬2N and higher interface-adhesion of the SrNbO-2N/NbNx/Nb structure, which suppress the recombination of photogenerated electrons and holes at the defects and lead to an increase of the photogenerated electron collection efficiency in a niobium substrate, respectively. This study is the first to address the fabrication of quaternary oxynitride crystal layers on a conductive substrate using an NH3-assisted flux-coating method.

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Publication details

The article was received on 31 Mar 2017, accepted on 12 Jun 2017 and first published on 12 Jun 2017


Article type: Paper
DOI: 10.1039/C7CE00614D
Citation: CrystEngComm, 2017, Accepted Manuscript
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    NH3‑Assisted Chloride Flux-Coating Method for Direct Fabrication of Visible-Light-Responsive SrNbO2N Crystal Layers

    K. Kawashima, M. Hojamberdiev, O. Mabayoje, B. R. Wygant, K. Yubuta, C. Mullins, K. Domen and K. Teshima, CrystEngComm, 2017, Accepted Manuscript , DOI: 10.1039/C7CE00614D

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