Huang Huijuan, Shen Jinni, Liu Xu, Zhong Yuhua, Zhang Zizhong, Wang Xuxu
State Key Laboratory of Photocatalysis on Energy and Environment, Research Institute of Photocatalysis, College of Chemistry, Fuzhou University, Fujian 350108, P. R. China.
Dalton Trans. 2022 Nov 29;51(46):17836-17843. doi: 10.1039/d2dt03003a.
The development of photocatalysts enabling stable and highly efficient water splitting hydrogen production remains an open challenge in the field of energy photocatalysis. Herein, NiP/γ-GaO nanosheets have been reported as excellent water splitting photocatalysts. NiP particles and γ-GaO nanosheets were synthesized by a facile hydrothermal process. The NiP/γ-GaO samples were prepared by an electrostatic self-assembly method with NiP particles and γ-GaO nanosheets as precursors. The 0.5 wt% NiP/γ-GaO sample shows a photocatalytic H-production activity as high as 2.7 mmol g h in pure water and 12 mmol g h in an aqueous methanol solution under a 125 W high pressure mercury lamp, respectively, which are much higher than those of pure γ-GaO and Pt/γ-GaO nanosheets modified with a comparable Pt content. The NiP component plays a role as an electron collector that promotes efficient separation of photogenerated electrons and holes, and thereby improves the efficiency of photocatalytic hydrogen production. The effects of inorganic and organic sacrificial reagents on the reaction efficiency and stability were observed and discussed. This work shows that NiP as a cocatalyst substituting noble metals can greatly improve the photocatalytic hydrogen production efficiency of γ-GaO compared to that in pure water and a methanol-water solution.
开发能够实现稳定且高效的光解水制氢的光催化剂，仍然是能量光催化领域中一个悬而未决的挑战。在此，NiP/γ-GaO纳米片已被报道为优异的光解水光催化剂。通过简便的水热法合成了NiP颗粒和γ-GaO纳米片。以NiP颗粒和γ-GaO纳米片为前驱体，采用静电自组装法制备了NiP/γ-GaO样品。在125W高压汞灯下，0.5wt%的NiP/γ-GaO样品在纯水中的光催化产氢活性高达2.7 mmol g⁻¹ h⁻¹，在甲醇水溶液中的光催化产氢活性高达12 mmol g⁻¹ h⁻¹，这远高于纯γ-GaO和具有相当Pt含量的Pt/γ-GaO纳米片的光催化产氢活性。NiP组分起到电子收集器的作用，促进光生电子和空穴的有效分离，从而提高光催化产氢效率。观察并讨论了无机和有机牺牲试剂对反应效率和稳定性的影响。这项工作表明，与在纯水和甲醇-水溶液中相比，NiP作为替代贵金属的助催化剂可以大大提高γ-GaO的光催化产氢效率。
