β-TaON Oxynitride Synthesis Using (C6N9H3)n and its Photoelectrochemical Properties

Koichiro Ueda^a, Yoshiyuki Inaguma^a, Yusuke Asakura^b, Shu Yin^b, Ken-ichi Katsumata^c

^aDepartment of Chemistry, Faculty of Science, Gakushuin University, 1-5-1 Mejiro, Toshima-ku, Tokyo 171-8588, Japan

^bInstitute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan

^cTokyo University of Science, Japan, Tokyo, Japan

Materials for Sustainable Development Conference (MATSUS)
Proceedings of nanoGe Fall Meeting 2018 (NFM18)

S1 Solar Fuel 18

Torremolinos, Spain, 2018 October 22nd - 26th

Organizers: Shannon Boettcher and Kevin Sivula

Poster, Koichiro Ueda, 309
Publication date: 6th July 2018

β-TaON is one of the famous oxynitride photocatalytic materials for water splitting and CO₂ reduction reactions under visible light irradiation^[1-3]. It is difficult to obtain β-TaON single phaseis difficult to obtain because TaON has three polytypes (β-TaON, γ-TaON, and δ-TaON) under ambient pressure, and is an intermediate phase between Ta₂O₅ and Ta₃N₅. This year, we have reported a new method for the β-TaON synthesis using (C₆N₉H₃)_n (melon) as a solid nitrogen source^[4]. In this study we investigated the photoelectrochemical properties of β-TaON particles prepared by our new method.β-TaON single phase powders were prepared from Ta₂O₅ with melon, solid nitrogen source, heating in a quartz glass tube at 1123 K for 3 hours. Before electrode preparation, β-TaON powders were annealed at 573 K for 72 hours to remove organic compounds from β-TaON particles surface. TaON/Ti electrodes were prepared by particle transfer method^[5,6] using Ti layers as contact and conductor layers by vacuum evaporation method. Co-Pi^[7] modified TaON/Ti photoanodes showed photocurrent under simulated sunlight.

References:

[1] Abe, R.; Takata, T.; Sugihara. H.; Domen. K. Photocatalytic overall water splitting under visible light by TaON and WO3 with an IO3−/I− shuttle redox mediator. Chem. Commun. 2005, 0, 3829-3831. In text citation [1]. Citation number: [1]

[2] Maeda, K.; Lu. D.; Domen, K. Direct Water Splitting into Hydrogen and Oxygen under Visible Light by using Modified TaON Photocatalysts with d0 Electronic Configuration. Chem. Eur. J. 2013, 19, 4986-4991. In text citation [2]. Citation number: [2]

[3] Sekizawa, K.; Maeda, K.; Domen, K.; Koike, K.; Ishitani, O. Artificial Z-Scheme Constructed with a Supramolecular Metal Complex and Semiconductor for the Photocatalytic Reduction of CO2J. Am. Chem. Soc. 2013, 135, 4596-4599. In text citation [3]. Citation number: [3]

[4] Ueda, K.; Inaguma, Y.; Asakura, Y.; Yin, S. New Method for the Synthesis of β-TaON Oxynitride Using (C6N9H3)n. Chem. Lett. 2018, 47, 840–842. In text citation [4]. Citation number: [4]

[5] Minegishi, T.; Nishimura, N.; Kubota, J.; Domen, K. Photoelectrochemical properties of LaTiO2N electrodes prepared by particle transfer for sunlight-driven water splitting. Chem. Sci. 2013, 4, 1120-1124.

[6] Ueda, K.; Minegishi, T.; Clune, J.; Nakabayashi, M.; Hisatomi, T.; Nishiyama, H.; Katayama, M.; Shibata, N.; Kubota, J.; Yamada, T.; Domen, K. Photoelectrochemical Oxidation of Water Using BaTaO2N Photoanodes Prepared by Particle Transfer Method. J. Am. Chem. Soc. 2015, 137, 2227–2230.

[7] Kanan, M.; Nocera, D. In situ formation of an oxygen-evolving catalyst in neutral water containing phosphate and Co2+. Science. 2008, 321, 1072-1075.

Acknowledgements:

This work was supported by a Japan Society for the Promotion of Science (JSPS) Grant-in-Aid for Scientific Research (B) (no. 15H04128), for Scientific Research on the Innovative Area “Mixed anion” (no. JP16H06439), and for the Strategic Research Foundation at Private Universities, 2015 2019, supported by the Minister of Education, Culture, Sports, Science and Technology (MEXT), Japan, and supported by the Joint Usage/Research Program of “the Photocatalysis International Research Center”, Research Institute for Science and Technology, Tokyo University of Science.

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