Simultaneous Realization of Direct Photoinduced Deposition and Improved H2-Evolution Performance of Sn-Nanoparticle-Modified TiO2 Photocatalyst
Simultaneous Realization of Direct Photoinduced Deposition and Improved H2-Evolution Performance of Sn-Nanoparticle-Modified TiO2 Photocatalyst
复制标题
同时实现 Sn 纳米颗粒改性 TiO2 光催化剂的直接光诱导沉积和改进的 H-2 析出性能
DOI：
10.1021/acssuschemeng.9b01516
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发表时间：
2019-06-03
影响因子：
8.4
通讯作者：
Yu, Jiaguo
中科院分区：
文献类型：
--
作者：
Gao, Duoduo;Wu, Xinhe;Yu, Jiaguo
新型非贵金属助催化剂的开发和制备对开发高活性的光催化制氢材料尤为关键。在本研究中，金属锡纳米粒子作为一种新型的制氢助催化剂，与传统的TiO2光催化剂进行了有效的结合，通过直接光诱导的方法大大提高了制氢反应的效率。因此，在乙二醇-乙醇体系中，直接光诱导合成纳米锡纳米TiO2光催化剂并提高其产氢活性可以很容易地同时实现。锡纳米粒子非常细小(约2 nm)，均匀地沉积在二氧化钛表面，通过形成锡(II)-乙二醇乙二醇络合物分子及其随后的原位光还原方法合成了高效的锡/二氧化钛光催化剂。光催化结果表明，金属锡助催化剂能显著提高TiO2光催化剂的产氢活性，其中以3wt%的锡/TiO2光催化剂的产氢速率最高，为553.1 mU/h(-1)g-1，是纯TiO2光催化剂(12.6mU/h-1)的43.9倍。在此基础上，提出了电子助催化剂促进TiO2光催化剂产氢效率的机理，即金属锡助催化剂可以作为电子受体快速俘获光激发电子，并作为界面产氢中心来提高产氢速率。金属锡助催化剂具有合成路线简单、稀土丰度高、催化活性高等特点，在开发高效光催化剂方面具有广阔的应用前景。
The exploitation and preparation of novel non noble-metal cocatalysts are particularly crucial to develop high activity photocatalytic hydrogen-generation materials. In this study, metallic Sn nanoparticle, a new hydrogen-generation cocatalyst, was effectively integrated with the conventional TiO2 photocatalyst to greatly boost the hydrogen-production reaction via a direct photoinduced method. Herein, the direct photoinduced synthesis of Sn nanoparticle-deposited TiO2 photocatalysts and their enhanced H-2-generation activity can be easily and simultaneously realized in an ethylene glycol-ethanol system. The Sn nano particles were very small (ca. 2 nm) and uniformly deposited onto the TiO2 surface to synthesize highly efficient Sn/TiO2 photo catalysts via the, formation of Sn(II)-EG complex molecules and their following in situ photoreduction method. Photocatalytic results indicated that metallic Sn cocatalyst could dramatically promote the H-2-generation activity of TiO2 photocatalyst, and the resultant Sn/TiO2(3 wt %) presented the highest H-2-production rate with a value of 553.1 mu mol h(-1) g(-1), which is 43.9 times as that of pure TiO2 (12.6 mu mol h(-1) g(-1)). Thus, an electron-cocatalyst-mediated mechanism is raised to explain the promoted H-2 generation efficiency of TiO2 photocatalyst, namely, the metallic Sn cocatalyst can act as the electron receiver to quickly capture photoexcited electrons and serve as the interfacial hydrogen-generation site to enhance the hydrogen-generation rate. Considering the facile synthetic route, earth abundance, and high activity, the metallic Sn cocatalyst would have enormous prospect for the development of efficient photocatalysts applied in different fields.