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Enhanced oxygen evolution catalyzed by in situ formed Fe-doped Ni oxyhydroxides in carbon nanotubes

Chen, Dandan and Sun, Qiuhong and Han, Cheng and Guo, Yuanyuan and Huang, Qi and Goddard, William A., III and Qian, Jinjie (2022) Enhanced oxygen evolution catalyzed by in situ formed Fe-doped Ni oxyhydroxides in carbon nanotubes. Journal of Materials Chemistry A, 10 (30). pp. 16007-16015. ISSN 2050-7488. doi:10.1039/d2ta04042e.

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The rational design and preparation of cost-effective, efficient and durable metal carbon nanomaterials for the oxygen evolution reaction (OER) is of great urgency. Herein, we report a high-performance OER electrocatalyst consisting of bimetallic FeNi₃ nanoparticles encapsulated in hierarchical carbon nanomaterial, denoted as FeNi3@NCNT. Through a stepwise strategy, hollow carbon nanorods with abundant carbon nanotubes can be successfully calcined from rod-like NiOF-1-Fe, which are hydrolyzed to the initial NiOF-1 by Fe(III) ions. The optimal FeNi₃@NCNT catalyst exhibits an excellent electrochemical performance with a low overpotential of 264 mV at 10 mA cm⁻², a Tafel slope of 58.5 mV dec⁻¹, and a robust stability over 10 hours compared to the control samples. This enhanced OER arises from the unique hollow nanorod modified with a nanotube structure, a large surface area, a rich nitrogen content, and the synergistic effect between Ni and Fe species. Indeed, it is catalyzed by in situ generated Fe coupling with NiOOH in carbon nanotubes, which is validated by the subsequent theoretical calculations. This work enables insights into the mechanism of Fe-doped Ni oxyhydroxides for efficient OER and adds to the increasing understanding of the design and synthesis of novel catalysts for efficient energy conversion and storage.

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Goddard, William A., III0000-0003-0097-5716
Qian, Jinjie0000-0002-9996-7929
Additional Information:© The Royal Society of Chemistry 2022. Received 20th May 2022. Accepted 4th July 2022. This article is part of the themed collection: Journal of Materials Chemistry A HOT Papers. This work was financially supported by the National Natural Science Foundation of China (21601137), the Natural Science Foundation of Zhejiang Province (LQ16B010003), the Basic Science and Technology Research Project of Wenzhou, Zhejiang Province (G20190007) and the Special Basic Cooperative Research Programs of the Yunnan Provincial Undergraduate Universities Association (202101BA070001-042 and 202101BA070001-031). WAG acknowledges the US National Science Foundation for support (NSF CBET-2005250). Author contributions. All authors contributed extensively to this work. J. Q. and W. A. G. conceived the research project. D. C. conducted the experiments and performed the characterization studies. D. C., Q. S., C. H., Y. G. and Q. H. wrote the manuscript with input from the other authors. All authors have given approval to the final version of the manuscript. There are no conflicts of interest to declare.
Funding AgencyGrant Number
National Natural Science Foundation of China21601137
Natural Science Foundation of Zhejiang ProvinceLQ16B010003
Basic Science and Technology Research Project of Wenzhou, Zhejiang ProvinceG20190007
Yunnan Provincial Undergraduate Universities Association202101BA070001-042
Yunnan Provincial Undergraduate Universities Association202101BA070001-031
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Issue or Number:30
Record Number:CaltechAUTHORS:20220720-918335000
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:115706
Deposited By: George Porter
Deposited On:21 Jul 2022 22:45
Last Modified:15 Aug 2022 22:16

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