Regensburg 2022 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 25: Poster

KFM 25.19: Poster

Donnerstag, 8. September 2022, 15:00–18:00, P2

Dense binary Fe-Cu sites promoting CO2 utilization to enable highly-reversible hybrid Na-CO2 battery — •Changfan Xu — Fachgebiet Angewandte Nanophysik, Institut für Physik & IMN MacroNano, Technische Universität Ilmenau, 98693 Ilmenau, Germany — School of Metallurgy and Environment, Central South University, Changsha 410083, China — Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China

A well-defined morphology of nitrogen-rich graphitic carbon framework with dense bimetallic active sites (Fe-Cu-N-C) was facilely prepared by introducing Fe3+ and Cu2+ to regulate in-situ grown carbon nanotubes as an advanced catalyst toward hybrid Na-CO2 batteries. Through metal content-tuning and carbon architecture-altering, the Fe-Cu-N-C was proved to be dramatically more effective than Cu-N-C and Fe-N-C. As the cathodic catalyst of a hybrid Na-CO2 battery, Fe-Cu-N-C can facilitate the fast evolution and degradation of flocculent discharge products and achieve an excellent long-term cyclability up to 1550 cycles (over 600 h). The outstanding performance is attributed to the cross-linked conductive framework affording a highway for accelerating electron transport and Na+/CO2 diffusion. Besides, the synergistic effects among defect-rich interfaces, Fe/Fe3C nanocrystals, Fe-Nx, and Cu-Nx sites derived from nitrogen doping enhance the catalytic activity. The possible growth and decomposition mechanisms of NaHCO3 products were also presented and discussed.