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Development of a Core–Shell Heterojunction Ta<sub>3</sub>N<sub>5</sub>-Nanorods/BaTaO<sub>2</sub>N Photoanode for Solar Water Splitting

Yuriy PihoshResearch Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904, JapanVikas NandalNanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, JapanTsutomu MinegishiResearch Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904, JapanMasao KatayamaDepartment of Chemical System Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, JapanTaro YamadaDepartment of Chemical System Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, JapanKazuhiko SekiNanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, JapanMasakazu SugiyamaResearch Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904, JapanKazunari DomenUniversity Professors Office, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
2020en
ABI

Annotatsiya

Heterostructure-based photoanodes have been investigated to enhance light absorption and promote the generation and extraction of charge carriers for efficient solar-to-hydrogen energy conversion. Oxy(nitride) semiconducting materials are promising candidates to harvest the visible solar spectrum; however, the realization of stable and efficient oxy(nitride) heterostructure-based photoanodes remains a challenge. Here, we demonstrate a core–shell heterojunction photoanode of Ta3N5-nanorods/BaTaO2N that is obtained by combining glancing angle deposition and dip coating techniques. The heterojunction photoanode homogeneously covered by a FeNiOx cocatalyst (Ta3N5-NRs/BaTaO2N/FeNiOx) generates a stable photocurrent of ∼4.5 mA cm–2 at 1.23 VRHE under simulated AM 1.5G sunlight. The stoichiometric evolution of O2 and H2 from water occurs steadily over an hour when the covered heterojunction photoanode is connected to a Pt counter electrode with faradaic efficiencies of 90%–95%. This work may open a new path to fabricating efficient and stable oxy(nitride) photoactive materials for solar energy conversion.

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DOI
10.1021/acsenergylett.0c00900

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