Qi Shi1, Yingde Wang1 (*), Zhongmin Wang2, Yongpeng Lei3 (*), Bing Wang1, Nan Wu1, Cheng Han1, Song Xie1, and Yanzi Gou1
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1 Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Changsha 410073, China 2 Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, China 3 College of Basic Education, National University of Defense Technology, Changsha 410073, China
The strategy of combining highly conductive frameworks with abundant active
sites is desirable in the preparation of alternative catalysts to commercial Pt/C
for the oxygen reduction reaction (ORR). In this study, N-doped graphene (NG)
and carbon nanotubes (CNT) were grown in-situ on Co-containing carbon
nanofibers (CNF) to form three-dimensional (3D) interconnected networks.
The NG and CNT bound the interlaced CNF together, facilitating electron
transfer and providing additional active sites. The 3D interconnected fiber
networks exhibited excellent ORR catalytic behavior with an onset potential of
0.924 V (vs. reversible hydrogen electrode) and a higher current density than Pt/C
beyond 0.720 V. In addition, the hybrid system exhibited superior stability and
methanol tolerance to Pt/C in alkaline media. This method can be extended to
the design of other 3D interconnected network architectures for energy storage
and conversion applications.