Regensburg 2025 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 10: Materials for the Storage and Conversion of Energy (joint session MM/KFM)

KFM 10.1: Vortrag

Dienstag, 18. März 2025, 14:00–14:15, H22

Multiscale defective interfaces for realizing Na-CO2 batteries with ultralong lifespan — •changfan xu, tzuchin huang, and yong lei — Fachgebiet Angewandte Nanophysik, Institut für Physik & IMN MacroNano, Technische Universität Ilmenau, 98693 Ilmenau, Germany

The cycling capability of Na-CO2 batteries has been impeded by limitations in the kinetics of cathodic CO2 reduction/evolution reaction (CO2RR/CO2ER) as well as the challenging process of depositing/stripping metallic Na during cycling.[1-3] Herein, a "two-in-one" electrode with multiscale defective FeCu interfaces (CP@FeCu) is presented, improving the kinetics of CO2RR/CO2ER and modulating sodium deposition behavior.[4] The enhancement of sodiophilicity and catalytic properties is attributed to multiscale defective FeCu interfaces, as revealed by experimental and theoretical investigations. The defect and valence oscillation effects originate in multiscale defective FeCu interfaces, effectively facilitating reactant adsorption and Na2CO3 decomposition during CO2RR/CO2ER processes, along with exceptional cycling stability of 2400 cycles (4800 h) at 5 μA cm*2. Meanwhile, the CP@FeCu with high sodium affinity creates a uniform electric field and strong Na adsorption, promoting favorable nucleation sites for dendrite-resistant and durable anodes. This work provides scientific insights into the design of "two-in-one" electrodes, which are crucial for addressing challenges in sodium anodes and CO2 cathodes. [1] Small 2023, 2206445 [2] Adv. Funct. Mater. 2023, 2300926 [3] Energy Environ. Mater. 2024, 7, e12626 [4] Adv. Mater. 2024, 2409533

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