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P: Fachverband Plasmaphysik

P 1: Low Pressure Plasmas and their Application I

P 1.3: Vortrag

Montag, 20. März 2023, 11:45–12:00, CHE/0089

Plasma-modified NiCo₂O₄ nanowires with abundant oxygen vacancies as electrocatalyst for the oxygen evolution reactions — •He Li¹, Sadegh Askari², and Jan Benedikt¹ — ¹Institute for Experimental and Applied Physics, Kiel University, Kiel, Germany — ²Department of Fiber and Polymer Technology, KTH Royal Institute of Technology, Stockholm, Sweden

The development of highly active and stable electrocatalysts for the oxygen evolution reaction (OER) is critical for the applications such as water splitting or production of rechargeable zinc-air batteries. Oxygen vacancy engineering has demonstrated great promises to regulate the OER performances of transition metal compounds. However, the facile and effective generation of oxygen vacancies is still a challenge. Herein, we fabricated a NiCo₂O₄ nanowire catalyst by the hydrothermal method and generated oxygen vacancies with various concentrations by Ar or H₂/Ar plasma treatment. The reactive radicals generated by plasma reduce the valence of metal ions in the oxides and create oxygen vacancy defects with high electrocatalytic activity. The H₂/Ar plasma-treated NiCo₂O₄ presents more surface oxygen vacancies and thus better electrocatalytic performance for OER. Our work offers a facile and efficient route to design efficient OER electrocatalysts for zinc-air batteries.