Abstract
Zn-air batteries (ZABs) offer a high specific energy density, cost-effectiveness, and eco-friendliness. Hence, they are attractive candidates for use as sustainable energy-storage devices. However, their practical applications are limited by their high bifunctional oxygen evolution reaction/oxygen reduction reaction (OER/ORR) overpotential and sluggish kinetics. To address these limitations, in this study, a highly active bifunctional oxygen catalyst, TNPs@N-CNT, is developed, in which Ni-Co-Fe trimetallic nanoparticles are anchored on N-doped carbon networks. TNPs@N-CNT is synthesized via the thermally driven combustion of collodion fuel. The carbonization of melamine foam containing pyridinic N in TNPs@N-CNT enhances the ORR and affords a high catalytic surface area and high electrical conductivity. Morphological studies and chemical characterization aid in finely tuning the thermal processing conditions, affording a TNPs@N-CNT suitable for charge transfer. TNPs@N-CNT shows enhanced ORR activity (half-wave potential = 0.62 V and onset potential = 1.49 V) in alkaline media. A ZAB with TNPs@N-CNT as the air cathode exhibits an output power density of 90 mW cm−2 and excellent cycling stability for over 200 h, outperforming previously reported carbon-supported precious-metal catalysts. This tunable and scalable fabrication strategy could promote the development of novel mesoporous structures combined with high-efficiency multi-metallic catalysts for applications in energy-storage systems.
Original language | English |
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Article number | 118859 |
Journal | Carbon |
Volume | 220 |
DOIs | |
Publication status | Published - 2024 Feb 20 |
Bibliographical note
Publisher Copyright:© 2024 Elsevier Ltd
Keywords
- Carbon nanotube
- Electrocatalyst
- Oxygen evolution reaction
- Oxygen reduction reaction
- Trimetallic nanostructure
- Zinc-air batteries
ASJC Scopus subject areas
- General Chemistry
- General Materials Science