Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 926, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.166746
Keywords
Fe/N-doping; Asphaltene; Cotton; Oxygen evolution reaction; Electrocatalyst
Categories
Funding
- National Natural Science Foundation of China [22002181]
- Development Projects of Shanxi Province [201903D121010, 2021-K80]
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In this study, asphaltene-derived carbon-coated Fe and N-doped porous carbon microtubes were successfully prepared using freeze-drying and carbonization/activation strategies. The optimized sample exhibited excellent OER activity and long-term durability under alkaline conditions, demonstrating the potential application of this catalyst. This work provides a new approach for the effective utilization of biomass and asphaltene resources.
The development of active nonprecious-metal and heteroatom-doped materials is critical for the oxygen evolution reaction (OER). Herein, asphaltene-derived carbon-coated Fe-and N-doped hierarchical hollow porous carbon microtubes were prepared through feasible freeze-drying and carbonization/activation strategies. Cotton with a fibrous morphology acted as a soft template and carbon precursor, while asphaltene with easy graphitization properties was utilized to stabilize the structure of microtubes and accelerate the charge conductivity. Meanwhile, Fe-and N-doping changed the electronic structure of carbon and increased the number of active sites. In particular, the optimum sample displayed excellent OER activity with a lower overpotential of 261.4 mV at 10 mA/cm(2) and Tafel slope of 94.60 mV/dec under alkaline conditions. Moreover, the catalyst demonstrated excellent long-term durability with a 10% attenuation rate after continuous operation for 50 h by the chronoamperometry method at a constant potential of 1.5 V. This work provides a strategy for the effective resource utilization of biomass and asphaltene to prepare highly efficient OER electrocatalysts. (C) 2022 Elsevier B.V. All rights reserved.
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