Constructing iron-group doped metal–organic framework films on hematite photoanodes for efficient solar water splitting

IF 23.2 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Advanced Composites and Hybrid Materials Pub Date : 2023-10-21 DOI:10.1007/s42114-023-00777-3

Xiu-Shuang Xing, Xuyang Zeng, Zhongyuan Zhou, Zeinhom M. El-Bahy, Mohamed H. Helal, Qianyu Gao, Hassan Algadi, Peilin Song, Xuzhao Liu, Xinru Zhang, Jimin Du

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Abstract

Hematite (α-Fe₂O₃) is considered a highly promising candidate material for photoelectrochemical water splitting (PEC-WS) due to its suitable band gap and band edge location. Nevertheless, enhancing PEC-WS performance through the surface construction of low-cost, highly efficient, and stable electrocatalysts still remains a challenge. This work presents a facile strategy to fabricate α-Fe₂O₃ photoanodes modified with the metal–organic framework films doped with iron-group elements (Fe, Co, and Ni), which forms abundant active sites and leverage bimetallic synergistic effects. The optimal photocurrent density of FTO/Sn@α-Fe₂O₃/MIL-125/Co photoanode achieves 1.97 mA/cm² at 1.23 V_RHE, which is 2.3 times that of the pure α-Fe₂O₃ photoanode. The on-set potential exhibits a cathodic shift of 0.1 V. The MIL-125 catalyst with Co doping exhibits the most excellent PEC-WS performance among the three dopants (Fe, Co, and Ni), which can be primarily attributed to more abundant active sites, the lower photogenerated carrier recombination, and the enhanced charge separation and transfer efficiency.

Graphical Abstract

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在赤铁矿光阳极上构建铁基掺杂金属有机骨架膜用于高效太阳能水分解

赤铁矿（α-Fe2O3）由于其合适的带隙和带边位置，被认为是一种非常有前途的光电化学水分解（PEC-WS）候选材料。然而，通过低成本、高效和稳定的电催化剂的表面构建来增强PEC-WS性能仍然是一个挑战。这项工作提出了一种简单的策略来制备用掺杂有铁族元素（Fe、Co和Ni）的金属-有机框架膜修饰的α-Fe2O3光阳极，该膜形成丰富的活性位点并利用双金属协同效应。FTO/Sn@α-Fe2O3/MIL-125/Co光阳极的最佳光电流密度在1.23VRHE下达到1.97mA/cm2，是纯α-Fe2O3光阳极的2.3倍。在三种掺杂剂（Fe、Co和Ni）中，具有Co掺杂的MIL-125催化剂表现出最优异的PEC-WS性能，这主要归因于更丰富的活性位点、更低的光生载流子复合以及增强的电荷分离和转移效率。图形摘要

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来源期刊

Advanced Composites and Hybrid Materials Multiple-

CiteScore

26.00

自引率

21.40%

发文量

185

期刊介绍： Advanced Composites and Hybrid Materials is a leading international journal that promotes interdisciplinary collaboration among materials scientists, engineers, chemists, biologists, and physicists working on composites, including nanocomposites. Our aim is to facilitate rapid scientific communication in this field. The journal publishes high-quality research on various aspects of composite materials, including materials design, surface and interface science/engineering, manufacturing, structure control, property design, device fabrication, and other applications. We also welcome simulation and modeling studies that are relevant to composites. Additionally, papers focusing on the relationship between fillers and the matrix are of particular interest. Our scope includes polymer, metal, and ceramic matrices, with a special emphasis on reviews and meta-analyses related to materials selection. We cover a wide range of topics, including transport properties, strategies for controlling interfaces and composition distribution, bottom-up assembly of nanocomposites, highly porous and high-density composites, electronic structure design, materials synergisms, and thermoelectric materials. Advanced Composites and Hybrid Materials follows a rigorous single-blind peer-review process to ensure the quality and integrity of the published work.