Activation of Nonoxide Photocatalyst Sheet Operable under Visible Light Irradiation up to 600 nm by Conductive Bilayer,ACS Energy Letters

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Activation of Nonoxide Photocatalyst Sheet Operable under Visible Light Irradiation up to 600 nm by Conductive Bilayer
ACS Energy Letters ( IF 19.3 ) Pub Date : 2024-09-03 , DOI: 10.1021/acsenergylett.4c01795
Swarnava Nandy ₁ , Hiroka Sandaiji ₂ , Shuji Sekimori ₂ , Junie Jhon M. Vequizo ₁ , Rhauane Almeida Galvão ₃ , Natsutogi Iwasa ₃ , Swapnil S. Karade ₁ , Mamiko Nakabayashi ₄ , Tsuyoshi Takata ₁ , Takashi Hisatomi _{1,

5} , Akira Yamakata ₆ , Kazunari Domen _{1,

7,

8,

9}

Affiliation

Particulate photocatalyst sheets allow for scalable sunlight-driven overall water splitting. Photocatalyst sheets composed of doped-La₅Ti₂Cu_0.9Ag_0.1O₇S₅ (LTCA), gallium zinc oxynitride (GaN:ZnO), and Au as the hydrogen evolution photocatalyst, oxygen evolution photocatalyst, and conductor layer, respectively, are promising candidates because of their long absorption edge wavelengths (700 and 600 nm, respectively). However, the actual performance of this sheet has been poor due to the large Schottky barrier at the GaN:ZnO/Au interface. Here, we developed a photocatalyst sheet incorporating conductive thin Au and thick Ti bilayer films having high and low work functions, respectively, which increased the activity by a factor of 6 compared with that of a single Au layer sheet. An optimized doped-LTCA/Au/Ti/CoO_x/GaN:ZnO sheet modified with CoO_x and Cr₂O₃/Rh cocatalysts exhibited a solar-to-hydrogen energy conversion efficiency of 0.3%. This work provides a key strategy based on the utilization of narrow bandgap oxynitride materials to construct efficient visible-light-driven nonoxide-based sheets.

中文翻译：

通过导电双层激活可在高达 600 nm 的可见光照射下操作的非氧化物光催化剂片

颗粒光催化剂片可实现可扩展的阳光驱动的整体水分解。由掺杂La ₅ Ti ₂ Cu _0.9 Ag _0.1 O ₇ S ₅ (LTCA)、镓锌氮氧化物(GaN:ZnO)和Au组成的光催化剂片分别作为析氢光催化剂、析氧光催化剂和导体层，由于其长吸收边波长（分别为 700 和 600 nm），因此成为有前途的候选者。然而，由于 GaN:ZnO/Au 界面处的肖特基势垒较大，该片材的实际性能较差。在这里，我们开发了一种包含分别具有高功函数和低功函数的导电薄Au和厚Ti双层膜的光催化剂片，与单层Au层片相比，其活性提高了6倍。用CoO _x和Cr ₂ O ₃ /Rh助催化剂改性的优化掺杂LTCA/Au/Ti/CoO _x /GaN:ZnO片材表现出0.3%的太阳能-氢能转换效率。这项工作提供了一种基于利用窄带隙氮氧化物材料构建高效可见光驱动的非氧化物基片材的关键策略。

更新日期：2024-09-03

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