Graphene nanosheets (GS) and carbon nanotubes have been considered as good catalysts candidates for applications in energy conversion and storage. However, hybrids of GS and carbon nanotubes are always formed in transition metal-based nitrogen-doped system, making the system quite complex for exploring the structure-activity relationship. To prepare the catalysts with desired species controllably, we try to adjust the outcomes with the effect of nitrogen on the growth of carbon nanotubes. In this work, a series of Fe-N co-doped carbon hybrid catalysts containing N-doped GS or hybrids of GS/bamboo carbon nanotubes (BCNTs) or BCNTs were obtained with one-step pyrolyzed method. To evaluate the effect of carbon morphology on performance of catalysts, oxygen reduction reaction (ORR) and CO2 reduction reaction (CO2RR) were used as model reactions. Electrochemical studies revealed that the catalysts containing only BCNTs showed the best performance of ORR (Eonset, 1.02 VRHE) and CO2RR (FECO, 91.1% at -0.6 VRHE) among the tested samples. Further investigations displayed that the remarkable activity is closely related to the defects, large specific surface area and high content of pyridinic N, and existence of FeNx in the unique BCNTs. Such work deepens fundamental understanding in the morphology-dependent catalysis for both ORR and CO2RR processes.
morphology tuning, graphene nanosheet, bamboo carbon nanotube, electrochemical reduction reaction
Online Available Date
Er-ling LI, Fa YANG, Ming-bo RUAN, Ping SONG, Wei-lin XU.
Effect of Morphology of Fe-N Codoped Carbon Nanomaterial on Electrochemical Reduction Reactions[J]. Journal of Electrochemistry,
Available at: https://jelectrochem.xmu.edu.cn/journal/vol25/iss4/8
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