Integrating CoOx cocatalyst on hexagonal α-Fe2O3 for effective photocatalytic oxygen evolution
Integrating CoOx cocatalyst on hexagonal α-Fe2O3 for effective photocatalytic oxygen evolution
复制标题
将 CoOx 助催化剂集成到六方 α-Fe2O3 上以实现有效的光催化析氧
DOI：
10.1016/j.apsusc.2018.11.014
复制
发表时间：
2019-03-01
影响因子：
6.7
通讯作者：
Li, Huaming
中科院分区：
文献类型：
--
作者：
Li, Li;She, Xiaojie;Li, Huaming
对于水的氧化反应，它涉及多电子反应，这是光催化水裂解的速率控制步骤，意味着光催化水裂解反应动力学受到水氧化反应的限制。在这里，我们证明，O-2的进化反应（OER）助催化剂（CoOx）可以显着提高OER性能的六方α-Fe 2 O3光收获机。虽然纯的六方α-Fe_2 O_3对水的氧化是惰性的，但5%CoOx/α-Fe_2 O_3的光催化O-2释放速率高达195.19 μ mol/g/h。光催化水氧化性能的提高归因于α-Fe 2 O3光生电子-空穴对的有效分离和空穴的高转移动力学。ESR结果表明，CoOx的引入提高了α-Fe 2 O3光生载流子的传输和分离效率.此外，还对光催化机理进行了详细的研究.
For water oxidation reaction, it involves multi-electron reaction, which is the rate-determining step for the photocatalytic water splitting, meaning the photocatalytic water splitting reaction kinetic is limited by water oxidation reaction. Here, we demonstrate that the O-2 evolution reaction (OER) cocatalyst (CoOx) can dramatically improve the OER performance of the hexagonal alpha-Fe2O3 photoharvester. Although the pure hexagonal alpha-Fe2O3 is inert for water oxidation, the photocatalytic O-2 evolution rate of 5% CoOx /alpha-Fe2O3 is up to similar to 195.19 mu mol/g/h. The enhanced photocatalytic water oxidation performance can be ascribed to the effective separation of the photogenerated electron-hole pairs of alpha-Fe2O3 and the high transfer kinetics of the holes. The ESR results show that the introduction of CoO x does enhance the transfer and separation efficiency of the photogenerated carriers of the hexagonal alpha-Fe2O3. Additionally, the photocatalytic mechanism was also researched in detail.