Chen Kaihong, Xiao Jiadong, Vequizo Junie Jhon M, Hisatomi Takashi, Ma Yiwen, Nakabayashi Mamiko, Takata Tsuyoshi, Yamakata Akira, Shibata Naoya, Domen Kazunari
Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Nagano-shi, Nagano 380-8553, Japan.
PRESTO, JST, 4-17-1 Wakasato, Nagano-shi, Nagano 380-8553, Japan.
J Am Chem Soc. 2023 Feb 22;145(7):3839-3843. doi: 10.1021/jacs.2c11025. Epub 2023 Jan 20.
The development of narrow-bandgap photocatalysts for one-step-excitation overall water splitting (OWS) remains a critical challenge in the field of solar hydrogen production. SrTaON is a photocatalytic material having a band structure suitable for OWS under visible light (λ ≤ 600 nm). However, the presence of defects in the oxynitride and the lack of cocatalysts to promote simultaneous hydrogen and oxygen evolution make it challenging to realize OWS using this material. The present work demonstrates a SrTaON-based particulate photocatalyst for OWS. This photocatalyst, which was composed of single crystals, was obtained by nitriding SrCl and TaO together with NaOH, with the latter added to control the formation of defects. The subsequent loading of bimetallic RuIrO nanoparticles accelerated charge separation and allowed the SrTaON photocatalyst to exhibit superior OWS activity. This research presenting the strategies of controlling the oxygen sources and promoting the cocatalyst function is expected to expand the range of potential OWS-active oxynitride photocatalysts and permit the design of efficient cocatalysts for photocatalytic OWS.
开发用于一步激发全水分解（OWS）的窄带隙光催化剂仍然是太阳能制氢领域的一项关键挑战。SrTaON是一种光催化材料，其能带结构适合在可见光（λ≤600 nm）下进行OWS。然而，氮氧化物中存在缺陷以及缺乏促进氢和氧同时析出的助催化剂，使得使用这种材料实现OWS具有挑战性。目前的工作展示了一种用于OWS的基于SrTaON的颗粒光催化剂。这种由单晶组成的光催化剂是通过将SrCl和TaO与NaOH一起氮化得到的，加入NaOH以控制缺陷的形成。随后负载双金属RuIrO纳米颗粒加速了电荷分离，并使SrTaON光催化剂表现出优异的OWS活性。这项提出控制氧源和促进助催化剂功能策略的研究，有望扩大潜在的具有OWS活性的氮氧化物光催化剂的范围，并允许设计用于光催化OWS的高效助催化剂。
