Multifunctional Conductive MOFs Enhance the Photocatalytic Hydrogen Evolution Efficiency of S-Type Ni3(HITP)2/TiO2 Heterojunctions

IF 3.7 2区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Langmuir Pub Date : 2024-10-29 DOI:10.1021/acs.langmuir.4c02651

Xiaotian Zhang, Zipeng Jin, Kunting Li, Yisheng Hu, Lei Xu, Baiyan Li

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Abstract

Despite their high surface area, remarkable porosity, and efficient charge transfer mechanisms, conductive MOFs have found limited utilization within the domain of photocatalysis. In this study, we synthesized a cutting-edge S-type Ni₃(HITP)₂/TiO₂ heterojunction photocatalyst exhibiting outstanding light harvesting and prolonged lifetime of photogenerated electrons through an in situ synthesis approach. Compared with TiO₂, the composite materials not only significantly increase the specific surface area by 4.07 times but also expand the visible light absorption edge from 400 to 1100 nm. The hydrogen production rate of Ti/Ni-3 reached 4.927 mmol·g^–1·h^–1, which is 4.51 times that of TiO₂. The S-type interface charge transfer pathway of the Ni₃(HITP)₂/TiO₂ composite material was inferred by band structure, in situ XPS, SPV, and free radical capture, which improves charge separation and extends the carrier lifetime to undergo directional migration driven by an IEF. This is the main reason for the improved photocatalytic performance of Ni₃(HITP)₂/TiO₂ composite materials.

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多功能导电 MOFs 提高了 S 型 Ni3(HITP)2/TiO2 异质结的光催化氢气转化效率

尽管导电 MOFs 具有高比表面积、显著的孔隙率和高效的电荷转移机制，但在光催化领域的应用却十分有限。在本研究中，我们通过原位合成方法合成了一种前沿的 S 型 Ni3(HITP)2/TiO2 异质结光催化剂，该催化剂具有出色的光收集能力，并能延长光生电子的寿命。与 TiO2 相比，复合材料不仅将比表面积显著提高了 4.07 倍，还将可见光吸收边沿从 400 纳米扩大到 1100 纳米。Ti/Ni-3 的产氢率达到 4.927 mmol-g-1-h-1，是 TiO2 的 4.51 倍。通过能带结构、原位 XPS、SPV 和自由基捕获推断出了 Ni3（HITP）2/TiO2 复合材料的 S 型界面电荷转移途径，它改善了电荷分离，延长了载流子寿命，使其在 IEF 的驱动下进行定向迁移。这是 Ni3(HITP)2/TiO2 复合材料光催化性能提高的主要原因。

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来源期刊

Langmuir 化学-材料科学：综合

CiteScore

6.50

自引率

10.30%

发文量

1464

审稿时长

2.1 months

期刊介绍： Langmuir is an interdisciplinary journal publishing articles in the following subject categories: Colloids: surfactants and self-assembly, dispersions, emulsions, foams Interfaces: adsorption, reactions, films, forces Biological Interfaces: biocolloids, biomolecular and biomimetic materials Materials: nano- and mesostructured materials, polymers, gels, liquid crystals Electrochemistry: interfacial charge transfer, charge transport, electrocatalysis, electrokinetic phenomena, bioelectrochemistry Devices and Applications: sensors, fluidics, patterning, catalysis, photonic crystals However, when high-impact, original work is submitted that does not fit within the above categories, decisions to accept or decline such papers will be based on one criteria: What Would Irving Do? Langmuir ranks #2 in citations out of 136 journals in the category of Physical Chemistry with 113,157 total citations. The journal received an Impact Factor of 4.384*. This journal is also indexed in the categories of Materials Science (ranked #1) and Multidisciplinary Chemistry (ranked #5).