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MM: Fachverband Metall- und Materialphysik

MM 7: Materials for Storage and Conversion of Energy II (joint session MM/KFM)

MM 7.5: Talk

Monday, March 18, 2024, 12:45–13:00, C 264

Multiscale defective FeCu interfaces for sodiophilic and catalytic-enhanced Na-CO2 batteries — •Changfan XU, Tzuchin Huang, Huaping Zhao, and Yong Lei — Fachgebiet Angewandte Nanophysik, Institut für Physik & IMN MacroNano, Technische Universität Ilmenau, 98693 Ilmenau, Germany

Sodium-carbon dioxide (Na-CO2) batteries are hindered by challenges such as unmanageable sodium deposition/ volume changes at anode and sluggish CO2 reduction/ evolution reaction (CO2RR/ CO2ER) kinetics at CO2 cathode upon cycling. Here, we propose a dual-functional electrode with multiscale defective FeCu interfaces (CP@FeCu) that acts as Na metal hosts and CO2 cathode simultaneously. Microstructural, electrochemical reaction, and theoretical calculations investigations collectively reveal that multiscale defective FeCu interfaces are responsible for the enhancement of sodiophilicity for Na plating/stripping at anode and catalytic activity for CO2RR/ CO2ER at CO2 cathode. Consequently, the CP@FeCu anode enables the uniform deposition of dendrite-free sodium, and the CP@FeCu cathode exhibited low overpotentials and exceptional long-term cycling stability. Significantly, implementation of a symmetrical Na-CO2 battery with CP@FeCu@Na anode and CP@FeCu cathode demonstrates significantly improved electrochemical properties. The introduction of multiscale defective FeCu interfaces with sodiophilic and catalytic dual centers offers an effective method for the tailoring and optimization of sodium metal batteries with high energy density.

Keywords: CO2 batteries; Na metal anode; CO2 cathode; dendrite-resistant; CO2 conversion