Effect of Annealing on the Photocatalytic and Photoelectrochemical Properties for TaON Oxynitride Prepared by (C6N9H3)n

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

^dTokyo University of Science, Japan, Tokyo, Japan

Materials for Sustainable Development Conference (MATSUS)
Proceedings of nanoGe Fall Meeting19 (NFM19)

#SolFuel19. Solar Fuel Synthesis: From Bio-inspired Catalysis to Devices

Berlin, Germany, 2019 November 3rd - 8th

Organizers: Roel van de Krol and Erwin Reisner

Poster, Koichiro Ueda, 406
Publication date: 18th July 2019

Hydrogen production using photocatalytic materials is attracting attention as a clean fuel production method. TaON is one of the famous photocatalysts that are able to decompose water into H₂and O₂ under visible light irradiation without any sacrificial reagent[1, 2]. Last year we reported on a new synthesis and photoelectrochemical properties of TaON using (C₆N₉H₃)_n, melon, as a solid nitrogen source[3]. In this study, we investigated the effect of annealing on the photocatalytic and photoelectrochemical properties of TaON prepared by our method. TaON powder was prepared from Ta₂O₅powder by heating with melon in quartz glass tube at 1123 K for 3 hours. Prepared TaON powder was annealed at 773 K to remove some organic species present on the surface. TaON/Ta/Ti photoanodes were prepared by a particle transfer method[4]. using Ta and Ti as contact and conductor layers, respectively. CoO_x-modified[5, 6]TaON/Ta/Ti photoelectrodes produced a photocurrent of 0.6 mA・cm^-2at 1.23 V_RHEunder simulated sunlight irradiation. The annealed TaON powder showed photocatalytic activity of O₂generation reaction from AgNO₃solution under visible light irradiation, whereas unannealed TaON had no photocatalytic activity.

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.

[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.

[3] 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.

[4] 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.

[5] 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.

[6] 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:

We thank Prof. Kazunari Domen of the University of Tokyo permitting for use of facilities. This study was partly supported by the Joint Usage/Research Program of “the Photocatalysis International Research Center”, Research Institute for Science and Technology, Tokyo University of Science. This work was supported by a Japan Society 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.

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