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Efficient Noble-Metal-Free Co-NG/TiO2 Photocatalyst for H2 Evolution: Synergistic Effect between Single-Atom Co and N-Doped Graphene for Enhanced Photocatalytic Activity
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-09-10 00:00:00 , DOI: 10.1021/acssuschemeng.8b02001
Lanhua Yi , Fujun Lan , Jinge Li , Caixian Zhao

Photocatalytic water splitting for H2 evolution is appealing for transforming solar energy into clean chemical fuel. This technique generally requires noble metals as H2 evolution cocatalysts to facilitate efficient cleavage of water. Herein, we report a noble-metal-free TiO2 nanobelts composite photocatalyst, in which TiO2 nanobelts are supported by nitrogen-doped graphene coordinated with a single Co atom (Co-NG). The results show that Co-NG is an efficient cocatalytst for the photocatalytic H2 production over TiO2. The optimal amount of Co-NG loading is found to be 3.5 wt %, showing a H2 evolution rate of 677.44 μmol h–1 g–1 under illumination of AM 1.5 G simulated sunlight, which is close to that of platinized TiO2 nanobelts and 2.6 and 31.2 times greater than that of 3.5 wt % NG/TiO2 nanobelts composite and pure TiO2 nanobelts, respectively. The significantly improved photocatalytic activity is ascribed to the remarkable synergistic effect between single-atom Co and N-doped graphene, which serve as effective H+ reduction sites and efficient electron acceptors, respectively. Besides, the Co-NG cocatalyst also effectively retards the recombination of photoinduced charge carriers and leads to a prolonged lifetime of charge pairs. This study reveals that Co-NG is an up-and-coming candidate as cocatalyst for development of cost-effective photocatalysts for efficient solar-driven H2 evolution.

中文翻译:

用于H 2释放的高效无贵金属Co-NG / TiO 2光催化剂:单原子Co和N掺杂石墨烯之间的协同效应,以增强光催化活性

用于分解H 2的光催化水分解技术很有吸引力,可以将太阳能转化为清洁的化学燃料。该技术通常需要贵金属作为H 2析出助催化剂,以促进水的有效裂解。本文中,我们报道了一种不含贵金属的TiO 2纳米带复合光催化剂,其中TiO 2纳米带由掺有单个Co原子(Co-NG)的氮掺杂石墨烯支撑。结果表明,Co-NG是在TiO 2上光催化生产H 2的有效助催化剂。发现最佳的Co-NG负载量为3.5 wt%,表明H 2的析出速率为677.44μmolh –1 g在AM 1.5 G模拟阳光的照射下–1接近于镀铂的TiO 2纳米带,分别是3.5 wt%NG / TiO 2纳米复合带和纯TiO 2纳米带的2.6和31.2倍。显着改善的光催化活性归因于单原子Co和N掺杂石墨烯之间的显着协同作用,这可作为有效的H +还原位点和有效电子受体。此外,Co-NG助催化剂还有效地阻止了光诱导电荷载体的重组,并延长了电荷对的寿命。这项研究表明,Co-NG有望成为开发高效太阳能驱动H 2的经济有效光催化剂的助催化剂。
更新日期:2018-09-10
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