在 g-C3N4 纳米片上合理构建 p-n 异质结 Ni(OH)2/NiS2，提高电荷载流子分离效率以促进光催化氢气进化

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology Pub Date : 2024-09-26 DOI:10.1016/j.seppur.2024.129905

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引用次数: 0

摘要

通过溶热和冷凝回流法，成功设计并合成了具有三明治结构的Ni(OH)2/NiS2/g-C3N4杂化物。此外，值得注意的是，p 型 Ni(OH)2 是在 n 型 NiS2 表面原位生成的，因为 Ni(OH)2 中的 Ni2+ 来自 NiS2。因此，在杂化物中 Ni（OH）2 和 NiS2 的界面之间构建了 p-n 异质结。此外，研究结果表明，与 g-C3N4、NiS2/g-C3N4 和 Ni(OH)2/g-C3N4 相比，经过优化的 Ni(OH)2/NiS2/g-C3N4 杂化物在可见光或模拟太阳光照射下具有更优越的 H2 演化性能。在 360、380 和 400 纳米波长下，Ni(OH)2/NiS2/g-C3N4-6 % 的表观量子产率（AQY）分别为 1.65 %、1.31 % 和 1.05 %。此外，所得到的 Ni(OH)2/NiS2/g-C3N4-6 % 混合物都显示出令人满意的光化学耐久性。此外，根据微观结构和光电特性表征、理论计算和原位 XPS 测试，三元催化剂促进 H2 演化的特性得益于特殊的三明治状结构和 p-n 异质结的协同作用。因为它们能显著提高载流子的分离效率，并为 H2 的产生提供丰富的活性位点。

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Rational construction p-n heterojunction Ni(OH)2/NiS2 on g-C3N4 nanosheet to promote the charge carriers separation efficiency for boosting photocatalytic hydrogen evolution

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Rational construction p-n heterojunction Ni(OH)2/NiS2 on g-C3N4 nanosheet to promote the charge carriers separation efficiency for boosting photocatalytic hydrogen evolution

The Ni(OH)₂/NiS₂/g-C₃N₄ hybrid with sandwich-like structure was successfully designed and synthesized through a solvothermal and condensation reflux method. Furthermore, it should be noted that the p-type Ni(OH)₂ was in situ generated on the surface of the n-type NiS₂, because the Ni²⁺ of the Ni(OH)₂ came from the NiS₂. Therefore, the p-n heterojunction was constructed between the interface of the Ni(OH)₂ and NiS₂ in the hybrid. Furthermore, the results revealed the optimized Ni(OH)₂/NiS₂/g-C₃N₄ hybrid displayed superior H₂ evolution property than that of the g-C₃N₄, NiS₂/g-C₃N₄, and Ni(OH)₂/g-C₃N₄ illuminating with visible-light or simulated-sunlight. The apparent quantum yield (AQY) of Ni(OH)₂/NiS₂/g-C₃N₄-6 % at 360, 380 and 400 nm were 1.65 %, 1.31 % and 1.05 %, respectively. Moreover, the resultant Ni(OH)₂/NiS₂/g-C₃N₄-6 % hybrid both displayed satisfactory photochemistry durability. Besides this, according to the microstructure and photoelectric property characterizations, theoretical calculation, and in situ XPS test, the promoted H₂ evolution property of the ternary catalyst was profit from the synergy impact of the particular sandwich-like structure, and p-n heterojunction. Because they could memorably boost the carriers’ separation efficiency, and offer abundant active sites for H₂ production.

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来源期刊

Separation and Purification Technology 工程技术-工程：化工

CiteScore

14.00

自引率

12.80%

发文量

2347

审稿时长

43 days

期刊介绍： Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.