Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
Publication date: 18th December 2023
The Zn-air battery has known as an efficiency energy storage device because of its high theoretical energy density, low manufacturing cost, environmentally friendly and stability. In the Zn-air battery, two catalytic reactions occur at the surface of a positive air-electrode: oxygen evolution reaction (OER) during charging and oxygen reduction reaction (ORR) during discharging. Until now, the expensive noble metal of Pt and Ru – based catalysts were still used as the efficient catalysts for OER and ORR reactions, respectively, which requires the development of new bifunctional catalysts to replace Pt and Ru-based catalysts. Herein, we successfully synthesized the N-doped carbon nanotube (CNT) growth on the composite of Ni and C (Ni/C) through the pyrolysis the mixture of Ni metal-organic framework and melanine with different ratios and at different temperatures, then applied them as bifunctional catalysts for both OER and ORR. The optimal samples synthesized at ratio of 1 : 2 between Ni metal-organic framwork and melanine and at 800 oC has shown the best catalytic performance with the overpotential of 328 mV at the current density of 10 mA cm-2 for OER and the saturated current density of -11.3 mA cm-2 for ORR in alkaline solution. These promise results open the new approach on the synthesis bifunctional catalysts of metal-carbon based composites for air electrode in Zn-air battery.
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