Post-synthetically modified metal-porphyrin framework GaTCPP for carbon dioxide adsorption and energy storage in Li-S batteries

• Published in: RSC advances 2022-08, Vol.12 (37), p.23989-24002
• Main Authors: Király, Nikolas, Capková, Dominika, Almáši, Miroslav, Kazda, Tomáš, Čech, Ondej, Čudek, Pavel, Fedorková, Andrea Straková, Lisnichuk, Maxim, Meynen, Vera, Zeleňák, Vladimír
• Format: Article
• Language: English
• Subjects: Adsorption; Carbon dioxide; Chemistry; Cobalt; Discharge; Doping; Electrochemical analysis; Electrode materials; Energy storage; Lithium sulfur batteries; Metal-organic frameworks; Porphyrins; Storage batteries; Storage capacity; Sulfur; Transition metals
• ISSN: 2046-2069; 2046-2069
• DOI: 10.1039/d2ra03301a

Lithium-sulphur batteries attract increasing interest due to their high theoretical specific capacity, advantageous economy, and "eco-friendliness". In this study, a metal-organic framework (MOF) GaTCPP containing a porphyrinic base ligand was used as a conductive additive for sulphur. GaTCPP was synthesized, characterized, and post-synthetically modified by the transition metal ions (Co /Ni ). The doping of GaTCPP ensured an increase in the carbon dioxide adsorption capacities, which were measured under different conditions. Post-synthetic modification of GaTCPP with Co /Ni ions has been shown to increase carbon dioxide storage capacity from 22.8 wt% for unmodified material to 23.1 wt% and 26.5 wt% at 0 °C and 1 bar for Co and Ni -doped analogues, respectively. As a conductive part of cathode material, MOFs displayed successful sulphur capture and encapsulation proven by stable charge/discharge cycle performances, high-capacity retention, and coulombic efficiency. The electrodes with pristine GaTCPP showed a discharge capacity of 699 mA h g at 0.2C in the fiftieth cycle. However, the doping of GaTCPP by Ni has a positive impact on the electrochemical properties, the capacity increased to 778 mA h g in the fiftieth cycle at 0.2C.