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Morphology and Structure Engineering in Nanofiber Reactor: Tubular Hierarchical Integrated Networks Composed of Dual Phase Octahedral CoMn 2 O 4 /Carbon Nanofibers for Water Oxidation
Author(s) -
Zhu Han,
Yu Danni,
Zhang Songge,
Chen Jiawei,
Wu Wenbo,
Wan Meng,
Wang Lina,
Zhang Ming,
Du Mingliang
Publication year - 2017
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201700468
Subject(s) - materials science , nanofiber , carbon nanofiber , chemical engineering , tafel equation , oxygen evolution , electrolyte , nanotechnology , ostwald ripening , porosity , composite material , carbon nanotube , electrode , electrochemistry , chemistry , engineering
1D hollow nanostructures combine the advantages of enhanced surface‐to‐volume ratio, short transport lengths, and efficient 1D electron transport, which can provide more design ideas for the preparation of highly active oxygen evolution (OER) electrocatalysts. A unique architecture of dual‐phase octahedral CoMn 2 O 4 /carbon hollow nanofibers has been prepared via a two‐step heat‐treatment process including preoxidation treatment and Ostwald ripening process. The hollow and porous structures provide interior void spaces, large exposed surfaces, and high contact areas between the nanofibers and electrolyte and the morphology can be engineered by adjusting the heating conditions. Due to the intimate electrical and chemical coupling between the oxide nanocrystals and integrated carbon, the dual‐phase octahedral CoMn 2 O 4 /carbon hollow nanofibers exhibit excellent OER activity with overpotentials of 337 mV at current density of 10 mA cm −2 and Tafel slope of 82 mV dec −1 . This approach will lead to the new perception of design issue for the nanoarchitecture with fine morphology, structures, and excellent electrocatalytic activity.