Mg–Zr Cosubstituted Ta3N5 Photoanode for Lower-Onset-Potential Solar-Driven Photoelectrochemical Water Splitting

Mg–Zr Cosubstituted Ta3N5 Photoanode for Lower-Onset-Potential Solar-Driven Photoelectrochemical Water Splitting

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 wate...

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Veröffentlicht in:Journal of the American Chemical Society 2015-10, Vol.137 (40), p.12780-12783
Hauptverfasser: Seo, Jeongsuk, Takata, Tsuyoshi, Nakabayashi, Mamiko, Hisatomi, Takashi, Shibata, Naoya, Minegishi, Tsutomu, Domen, Kazunari
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container_end_page 12783
container_issue 40
container_start_page 12780
container_title Journal of the American Chemical Society
container_volume 137
creator Seo, Jeongsuk
Takata, Tsuyoshi
Nakabayashi, Mamiko
Hisatomi, Takashi
Shibata, Naoya
Minegishi, Tsutomu
Domen, Kazunari
description 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 VRHE under AM 1.5G-simulated sunlight, which represented a negative shift from the ca. 0.8 VRHE 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 Mg2+ and/or Zr4+.
doi_str_mv 10.1021/jacs.5b08329
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title Mg–Zr Cosubstituted Ta3N5 Photoanode for Lower-Onset-Potential Solar-Driven Photoelectrochemical Water Splitting
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