Mg–Zr Cosubstituted Ta<sub>3</sub>N<sub>5</sub> Photoanode for Lower-Onset-Potential Solar-Driven Photoelectrochemical Water Splitting
Jeongsuk SeoDepartment of Chemical System Engineering, School of
Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, JapanTsuyoshi TakataGlobal Research Center for Environment and Energy Based
on Nano1materials Science (GREEN), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba-city, Ibaraki 305-0044, JapanMamiko NakabayashiInstitute of Engineering Innovation, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, JapanTakashi HisatomiDepartment of Chemical System Engineering, School of
Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, JapanNaoya ShibataInstitute of Engineering Innovation, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, JapanTsutomu MinegishiDepartment of Chemical System Engineering, School of
Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, JapanKazunari DomenDepartment of Chemical System Engineering, School of
Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
2015en
ABI
Annotatsiya
In p/n photoelectrochemical (PEC) cell systems, a low onset potential for the photoanode, as well as a high photocurrent, are critical for efficient water splitting. Here, we report a Mg-Zr cosubstituted Ta3N5 (Ta3N5:Mg+Zr) photoanode, designed to provide a more negative onset potential for PEC water splitting. The anodic photocurrent onset on Ta3N5:Mg+Zr was 0.55 V(RHE) under AM 1.5G-simulated sunlight, which represented a negative shift from the ca. 0.8 V(RHE) for pure Ta3N5. This negative shift in the onset potential of PEC water splitting was attributed to the change in the bandgap potential due to partial substitution by the foreign ions Mg(2+) and/or Zr(4+).
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