Abstract
The fabrication of one-dimensional (1D) nanocatalysts with high active surface areas is very important to the development of high-performance catalysts but challenging. Through the phosphidation of metal-organic framework (MOF) nanofiber (NF) composites, bifunctional cobalt phosphide NFs (CoP NFs) which showed a diameter of about 100 nm and length of several micrometers as well as a large catalytic surface area were successfully fabricated and used as the electrocatalysts for water splitting. Taking the advantage of this MOF-derived strategy, a series of 1D nanostructures including Co3O4 NFs, and carbon NFs immobilized with CoP or Co nanoparticles were also synthesized and investigated. The density of active sites and catalytic performances of CoP NFs could be improved by the modulation of Cu-related species. The uniform Cu-doped CoP NFs showed the best catalytic performances for both oxygen and hydrogen evolutions with the overpotentials of 330 and 170 mV, respectively, which are comparable to those of commercial noble-metal catalysts. This work provides a facile process to fabricate 1D bifunctional electrocatalysts with desired functionalities for energy-related applications.
摘要
高性能催化剂的开发和利用是能源领域的研究热点, 其中制备具有高活性面积的一维纳米催化剂是目前的难点. 本研究以金属有机框架(MOF)复合纤维为前驱体, 通过热处理-磷化过程制备了具有氧析出(OER)和氢析出(HER)双功能特性的CoP纳米纤维. 该MOF衍生策略也可以用来制备其他一维纳米材料, 如Co3O4纳米纤维、Co/C纤维和CoP/C复合纤维. 研究表明, CoP纳米纤维的直径约100 nm, 长度可达几微米, 具有较高的活性面积. 通过Cu掺杂改性可以提高CoP纳米纤维的催化活性, 碱性条件下测得其对OER和HER的过电位分别为330和170 mV, 可与商业的贵金属催化剂相媲美. 该工作也为一维双功能电极催化剂的制备及功能化提供了研究基础.
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Acknowledgements
This work was financially supported by the National Institute of Advanced Industrial Science and Technology (AIST), Jiangsu University (4023000046), Shenzhen Key Laboratory of Micro/Nano-Porous Functional Materials (SKLPM) (ZDSYS20210709112802010), China Postdoctoral Science Foundation (2022TQ0126 and 2022M721375), Guangdong Grants (2021ZT09C064), and the National Key Research and Development Project (2022YFA1503900).
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Zou L, Wei YS, Xu Q and Kitagawa S conceived the project and designed the experiments. Zou L fabricated the samples, tested the physical and electrochemical performances of the nanocatalysts and wrote the manuscript. Wang Q performed the XPS analysis and revised the manuscript. Liu Z was responsible for the TEM analysis. All authors analyzed the data and contributed to the discussion.
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The authors declare that they have no conflict of interest.
Lianli Zou received his PhD degree in 2019 from Kobe University under the supervision of Prof. Qiang Xu. After working as a postdoctoral researcher at AIST-Kyoto University CHEM-OIL, he jointed Jiangsu University in 2021 and worked as an assistant professor. His research interests are focusing on the synthesis and application of low-dimensional nanomaterials for catalysis and energy storage.
Qiang Xu received his PhD degree from Osaka University in 1994. He worked as the director of AIST-Kyoto University CHEM-OIL, adjunct professor of Kobe University/Kyoto University, and is now chair professor of Southern University of Science and Technology. His research interests include the chemistry of nanostructured materials and their applications, especially for catalysis and energy.
Susumu Kitagawa obtained a PhD degree from Kyoto University. He is a distinguished professor and director of iCeMS, Kyoto University. He initiated the science and technology of gas with porous coordination polymers (PCPs) and metal-organic frameworks (MOFs). He pioneered the chemistry of flexible PCPs/MOFs and named soft porous crystals (SPCs), demonstrating various functions such as storage and separation. He classifies this material as Generations I to IV as it develops.
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Zou, L., Wei, YS., Wang, Q. et al. Cobalt phosphide nanofibers derived from metal-organic framework composites for oxygen and hydrogen evolutions. Sci. China Mater. 66, 3139–3145 (2023). https://doi.org/10.1007/s40843-023-2438-6
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DOI: https://doi.org/10.1007/s40843-023-2438-6