Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.203
Publication date: 18th December 2023
Carbon materials, such as graphene and carbon nanotubes (CNTs), are frequently incorporated to develop multifunctional electrocatalysts for energy conversion reactions, such as water oxidation and reduction, and oxygen reduction reactions, etc. Many studies have reported that the enhanced catalytic performance resulting from the introduction of carbon materials is primarily attributed to their conductivity, which improves charge transfer kinetics compared to pristine electrocatalysts. In this presentation, we synthesized nanosheet-shaped Ni-based catalysts on CNTs and achieved comparable or even superior catalytic performance to those of the well-develpoed noble catalysts for the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). Through systematic analyses and DFT calculations, we discovered that the distortion of Ni active sites induced by the CNT support is the main factor contributing to improved OER and ORR performance. Utilizing this bifunctional catalyst, we also successfully achieved Zn-air batteries with high capacity and extended cyclability. The local structural distortion induced by interfacial charge transfer contributes to tunable catalytic activity that opens an avenue for design of low-cost and multifunctional catalysts and extends its applications in the fields of clean and renewable energy.
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