Novel S-scheme RP/NiCo-LDH composite with remarkably enhanced photocatalytic activity for H2 evolution under visible-light irradiation,New Journal of Chemistry

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Novel S-scheme RP/NiCo-LDH composite with remarkably enhanced photocatalytic activity for H2 evolution under visible-light irradiation
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2021-08-20 , DOI: 10.1039/d1nj03004c
Linying Hu ₁ , Jing Xu _{1,

2,

3} , Yin Liu ₁ , Sheng Zhao ₁

Affiliation

A novel red phosphorus/nickel cobalt layered double hydroxide (RP/NiCo-LDH) heterojunction was successfully prepared and exhibited an excellent photocatalytic performance for hydrogen evolution. The formation of an S-scheme between purified RP and the NiCo–LDH effectively promoted the generation of an electric field at the interface between RP and the NiCo-LDH. The existence of an internal electric field can promote the migration of photoexcited carriers from the conduction band of pure RP to the valence band of the NiCo-LDH, thus effectively inhibiting the recombination efficiency of electron/hole pairs. Under simulated visible-light irradiation, the hydrogen evolution activity of the 70 wt% NiCo-LDH composite catalyst RP/NiCo-LDH reached 32.8 mmol g⁻¹ at 5 h, which was 6.41 times that of pure NiCo-LDH. The RP/NiCo-LDH composite photocatalyst was characterized using a series of characterization techniques. Among them, UV absorption spectra, fluorescence and photoelectrochemical experiments showed that the absorption rate and the electron-transfer rate of the RP/NiCo-LDH composite catalyst were significantly higher than that of the pure RP and NiCo-LDH. Therefore, RP/NiCo-LDH composite photocatalysts open up a new route for the development of non-noble metal photocatalysts.

中文翻译：

新型 S 型 RP/NiCo-LDH 复合材料在可见光照射下具有显着增强的 H2 析出光催化活性

成功制备了一种新型的红磷/镍钴层状双氢氧化物（RP/NiCo-LDH）异质结，并表现出优异的析氢光催化性能。纯化的 RP 和 NiCo-LDH 之间形成 S 型有效地促进了 RP 和 NiCo-LDH 之间界面处电场的产生。内电场的存在可以促进光激发载流子从纯RP的导带迁移到NiCo-LDH的价带，从而有效抑制电子/空穴对的复合效率。在模拟可见光照射下，70 wt% NiCo-LDH复合催化剂RP/NiCo-LDH的析氢活性达到32.8 mmol g ^-15 h，是纯 NiCo-LDH 的 6.41 倍。使用一系列表征技术对 RP/NiCo-LDH 复合光催化剂进行了表征。其中，紫外吸收光谱、荧光和光电化学实验表明，RP/NiCo-LDH复合催化剂的吸收率和电子转移率明显高于纯RP和NiCo-LDH。因此，RP/NiCo-LDH复合光催化剂为非贵金属光催化剂的发展开辟了新途径。

更新日期：2021-09-13

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