Abstract Loading of cocatalysts can effectively inhibit the recombination of photogenerated carriers in photocatalysts and greatly improve the photocatalytic hydrogen production rate. Cocatalysts can be deposited at the outlet points of electrons using a photochemical method, which is beneficial for the following photocatalytic hydrogen production reaction. H2PO2– has been used in the photochemical reduction of transition metals because of its special properties. However, the particles formed in the presence of H2PO2–are very large and highly crystalline, which may inhibit the activity of photocatalysts. In this study, we designed a new method for synthesizing photocatalysts by photodeposition using some other phosphates, aiming to prepare controllable weakly crystalline and small-size cocatalysts to improve the hydrogen production activity. The cocatalyst prepared using H2PO3– as an inorganic sacrificial agent has an amorphous structure and an average size of about 10 nm. The optimal photocatalytic hydrogen production rate of the obtained Ni(OH)2/g-C3N4 (4.36 wt%) is 13707.86 μmol·g−1·h−1, which is even higher than the activity of Pt-4.36 wt%/g-C3N4 (11210.93 μmol·g−1·h−1). Mechanistic studies show that loading of Ni(OH)2 can efficiently accelerate the separation and transfer efficiency of photogenerated charge carriers.

中文翻译：

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以无机亚磷酸为牺牲剂可控光化学合成无定形Ni(OH)2作为制氢助催化剂

摘要 负载助催化剂可以有效抑制光催化剂中光生载流子的复合，大大提高光催化产氢速率。助催化剂可以通过光化学方法沉积在电子的出口点，有利于后续的光催化制氢反应。H2PO2– 由于其特殊性能，已被用于过渡金属的光化学还原。然而，在 H2PO2 存在下形成的颗粒非常大且结晶度高，这可能会抑制光催化剂的活性。在本研究中，我们设计了一种使用其他磷酸盐通过光沉积合成光催化剂的新方法，旨在制备可控的弱结晶和小尺寸助催化剂以提高制氢活性。使用 H2PO3– 作为无机牺牲剂制备的助催化剂具有无定形结构，平均尺寸约为 10 nm。所得Ni(OH)2/g-C3N4（4.36 wt%）的最佳光催化产氢率为13707.86 μmol·g-1·h-1，甚至高于Pt-4.36 wt%/g的活性-C3N4 (11210.93 μmol·g-1·h-1)。机理研究表明，Ni(OH)2 的负载可以有效地加速光生载流子的分离和转移效率。