硼化镍修饰二氧化钛的光催化产氢性能研究

Nickel Boride Modified Titanium Dioxide for Photocatalytic Hydrogen Evolution

摘要: 过渡金属硼化物具有高电导、高硬度和高稳定性等特点，在光催化产氢方面获得了较高的关注。本文通过简单的一步法制备得到了硼化镍及硼化镍修饰的二氧化钛光催化剂，X射线衍射表明硼化镍为非晶态。与单纯的P25相比，引入硼化镍后的光催化剂表现出了明显增强的产氢活性，优化后的样品在4小时内的总产氢速率是2651 µmol g⁻¹ h⁻¹，约为单纯P25的110倍(P25在4小时内的总产氢速率为24 µmol g⁻¹ h⁻¹)。光电性能测试结果表明，硼化镍的引入抑制了电子和空穴复合，提高了载流子的分离效率及迁移能力，同时降低了产氢过电位，从而提升了材料的光催化产氢活性。24小时连续光催化产氢测试结果表明材料具有较好的稳定性。

Abstract: Owing to the advantages of high conductivity, high hardness and high stability, the transition metal borides have attracted much attention in photocatalytic hydrogen production. A nickel-boride modified titanium dioxide photocatalyst was prepared by a simple method in this work. X-ray dif-fraction showed that nickel boride was amorphous phase. Compared with pure P25, the photo-catalyst after introducing nickel boride exhibited a significantly enhanced hydrogen production activity, and the total hydrogen production rate of the NB-3 sample reached 4651 µmol g⁻¹ h⁻¹ in 4 hours, which is about 110 times than that of pure P25 (24 µmol g⁻¹ h⁻¹). The result of 24 hours con-tinuous photocatalytic hydrogen production test showed that the material has good stability. The photoelectric performance test results indicated that nickel boride could suppress the recombina-tion of electrons and holes, improve separation efficiency and migration ability of the carrier, and reduce the hydrogen production overpotential, thereby enhancing the photocatalytic hydrogen production activity of the material.