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MM: Fachverband Metall- und Materialphysik

MM 54: Materials for Storage and Conversion of Energy V

MM 54.2: Vortrag

Donnerstag, 21. März 2024, 10:30–10:45, C 264

chemically embedding cobalt nanospheres in N-doped carbon nanosheets for enhanced zinc-air batteries — •Ningxiang Wu¹, Huaping Zhao¹, Sheng Li², and Yong Lei¹ — ¹Fachgebiet Angewandte Nanophysik, Institut für Physik & IMN MacroNano, Technische Universität Ilmenau, 98693 Ilmenau, Germany — ²Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing, 211800, China

The next-generation oxygen electrochemical catalysts based on non-precious metals have been extensively studied for zinc-air batteries (ZABs). Among them, Co-N-C catalysts have attracted considerable attention due to their excellent oxygen catalytic performance. However, the synthesis of Co nanoparticles with uniform structure and distribution on conductive and stable substrates remains challenging. Herein, we have prepared cobalt nanoparticles chemically embedded in N-doped carbon nanosheets (Co@NCS) by a simple organic-inorganic hybrid molten salts method. Due to the multifunctional environment provided by the mixed salts, the Co@NCS can exhibit efficient oxygen reduction and evolution reaction (ORR/OER) performance, enabling them to be suitable in ZABs. The resulting ZABs have a considerable open-circuit voltage of 1.40 V, a good peak power density of 130.4 mW cm-2, and long cycle stability for 100 h at 10 mA cm-2.

Keywords: Co-N-C catalytic sites; hybrid molten salts; multifunctional environment; N-doped carbon nanosheets; Zinc-air batteries