Han Zhu1,2, Danni Yu1, Songge Zhang1, Jiawei Chen1, Wenbo Wu3, Meng Wan1, Lina Wang1, Ming Zhang1, Mingliang Du1,2
1College of Materials and Textiles, Key Laboratory of Advanced Textile Materials and Manufacturing Technology of the Ministry of Education, Zhejiang Sci-Tech University, Hangzhou, 310018 P. R. China
2Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, P. R. China
3Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, 117585, Singapore
Tóm tắt
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 CoMn2O4/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 CoMn2O4/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.
