Mg鈥揨r Cosubstituted Ta3N5 Photoanode for Lower-Onset-Potential Solar-Driven Photoelectrochemical Water Splitting

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• 作者：Jeongsuk Seo ; Tsuyoshi Takata ; Mamiko Nakabayashi ; Takashi Hisatomi ; Naoya Shibata ; Tsutomu Minegishi ; Kazunari Domen
• 刊名：Journal of the American Chemical Society
• 出版年：2015
• 出版时间：October 14, 2015
• 年：2015
• 卷：137
• 期：40
• 页码：12780-12783
• 全文大小：289K
• ISSN：1520-5126

文摘

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鈥揨r 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 Mg²⁺ and/or Zr⁴⁺.