Metal‐organic framework‐derived Cu@Co۴N nanoparticles anchored on N-doped carbon nanotubes for efficient and stable ORR activity
Publish place: Iranian Journal of Hydrogen & Fuel، Vol: 10، Issue: 4
Publish Year: 1402
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_IJHFC-10-4_003
تاریخ نمایه سازی: 22 فروردین 1403
Abstract:
Developing highly efficient, durable, and low-cost electrocatalysts for oxygen reduction reaction (ORR) is very important for energy conversion technologies. Electrocatalysts with porous structures, numerous active sites, and earth-abundant are exceedingly favorable for ORR reaction. In this work, the ۳D nano hollow-shell Cu@Co۴N anchored on N-doped carbon nanotubes (Cu@Co-N-C) was synthesized using pyrolyzed Cu@ZnCoZIF. The synthesized Cu@Co-N-C with bimetallic active sites, high specific surface area, high porosity structure, and nitrogen doping level demonstrates superior ORR activity. The physical characteristics of the cathode electrocatalysts were assessed through X-ray powder diffraction (XRD), scanning electron microscopy (FESEM), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET), Raman, and energy dispersive X-ray analysis (EDX) for elemental mapping. The electrocatalyst illustrates a higher half-wave potential of ۰.۸۸ V vs. RHE than that of the Pt/C electrocatalyst in an alkaline electrolyte. Moreover, it also has great ORR stability, making it one of the best Pt-free electrocatalysts. The current density of the Cu@Co-N-C is approximately -۵.۴۶ mA cm-۲, which is higher than that of Co-N-C (-۴.۲۰ mA cm-۲), and NCNTs (-۱.۹ mA cm-۲). Moreover, higher stability was obtained for Cu@Co-N-C in comparison with Pt/C. So, this material is an excellent choice as a cathodic catalyst for application in metal-air fuel cells.
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Authors
Parisa Akbarian
Hydrogen and Fuel Cell Research Laboratory, Department of Chemistry, Yasouj University, Yasouj, Iran
Mehdi Kheirmand
Department of Chemistry, School of basic sciences, Yasouj University, Yasouj, Iran
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