Exposing Single Ni Atoms in Hollow S/N-Doped Carbon Macroporous Fibers for Highly Efficient Electrochemical Oxygen Evolution.
Yafei Zhao, Yan Guo, Xue Feng Lu, Deyan Luan, Xiaojun Gu, Xiong Wen David Lou
Author Information
Yafei Zhao: School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore.
Yan Guo: School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, 010021, China.
Xue Feng Lu: School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore.
Deyan Luan: School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore.
Xiaojun Gu: School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, 010021, China.
Xiong Wen David Lou: School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore. ORCID
The development of efficient and cost-effective electrocatalysts toward the Oxygen evolution reaction (OER) is highly desirable for clean energy and fuel conversion. Herein, the facile preparation of Ni single atoms embedded hollow S/N-doped carbon macroporous fibers (Ni SAs@S/N-CMF) as efficient catalysts for OER through pyrolysis of designed CdS-NiS /polyacrylonitrile composite fibers is reported. Specifically, CdS provides the sulfur source for the doping of polyacrylonitrile-derived carbon matrix and simultaneously creates the hollow macroporous structure, while NiS is first reduced to nanoparticles and finally evolves into single Ni atoms through the atom migration-trapping strategy. Benefiting from the abundantly exposed single Ni atoms and hollow macroporous structure, the resultant Ni SAs@S/N-CMF electrocatalysts deliver outstanding activity and stability for OER. Specifically, it needs an overpotential of 285 mV to achieve the benchmark current density of 10 mA cm with a small Tafel slope of 50.8 mV dec .
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Grants
MOE2019-T2-2-049/Ministry of Education of Singapore
22162019/National Natural Science Foundation of China
2021GG0195/Science and Technology Projects of Inner Mongolia Autonomous Region