Ni3FeN/Co,N-CNF Composites Applied to Reversible Zinc Air Battery
Reversible zinc air batteries have the advantages of low cost, environmental friendliness, and high energy density (1084 Wh kg-1), which have great potential for portable vehicles and energy storage devices. The core component of the battery is a dual-function catalyst that drives oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), but there are problems such as slow kinetics and poor cycling stability. Therefore, the development of cheap and efficient dual-function catalysts is of great significance for the practical application of reversible zinc-air batteries.
Nitrides, such as Ni3FeN, exhibit excellent performance in electrocatalytic oxygen reduction (OER) due to their unique electronic structure and semi-metallic properties. However, the use of Ni3FeN in a reversible zinc-air battery faces two problems. First, the ORR activity of nitrides is low. Second, nitrides tend to agglomerate in the synthesis process (calcining ammonia atmosphere), making it difficult to obtain smaller sizes and more. Exposed nitrides at multiple active sites hinder further improvement of their OER performance.
Recently, Zhang Tie-rui, a researcher of the supramolecular photochemistry research team of the Institute of Physics and Chemistry, Chinese Academy of Sciences, adopted the strategy of “one stone with two birds†and introduced a cobalt-nitrogen co-doped carbon carrier (Co, N-CNF) to effectively reduce Ni3FeN in the high-temperature synthesis process. Reunion problem, so as to reduce its size to 14nm; while Co, N-CNF itself has excellent ORR performance. Therefore, the OER performance of Ni3FeN/Co, N-CNF composites is significantly better than that of noble metal IrO2, and the ORR performance exceeds that of commercial Pt/C. This dual-function catalyst can be practically applied to reversible zinc-air batteries and at high current densities (50 mA Cm-2) work stably for a long time. This strategy provides new ideas for designing and synthesizing multifunctional catalysts and can be widely applied to metal-air batteries, rechargeable-discharge fuel cells, fully decomposed water, and other energy fields.
The results were published on Nano Energy under the title 3D Carbon Nanoframe Scaffold-immobilized Ni3FeN Nanoparticle Electrocatalysts for Rechargeable Zinc-Air Batteries' Cathodes.
The research work was supported by the National Key Basic Research Program of the Ministry of Science and Technology, the National Science Foundation of China's Outstanding Young Scientists Fund, the National "Millions Plan" - Youth Outstanding Talent Support Program, and the Chinese Academy of Sciences' Strategic Leading Science and Technology Project (Class B).
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