Berlin 2024 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 14: Materials for Storage and Conversion of Energy IV
MM 14.5: Talk
Monday, March 18, 2024, 17:45–18:00, C 264
A direct observation of the influence of nitrogen-doping on ion dynamics for electric double layer capacitor performance — •Henry R. N. B. Enninful1, 3, Marius Hermesdorf2, Desirée Leistenschneider2, Martin Oschatz2, Alex Forse3, and Rustem Valiullin1 — 1Universität Leipzig — 2Friedrich-Schiller-Universität Jena — 3University of Cambridge, UK
Substantial improvements in the design of Electric Double Layer Capacitors (EDLC) have led to increased performance in both power and energy densities. To obtain comparable energy densities to those of batteries, electrode materials functionalized with nitrogen have been produced to yield very high specific capacitances and energy densities.
The mechanisms that underlie the improved capacitances due to electrode-electrolyte surface interactions is still rarely understood. This work sheds light on ion transport and mobility at the pore surface and within the pore interior. We show that for carbon electrodes synthesized from cellulose and potassium carbonate, increased melamine content leads to a sacrifice of the pore surface area and volume, resulting in reduced specific capacitances. Furthermore, the substitution of melamine with urea in the same ratio produces reduced nitrogen content in the resulting material. The effect thereof, is an attendant reduction in specific capacitance regardless of the comparable surface area. Lastly, we show that electrodes with a certain threshold of nitrogen content are able to store ions from a pure water *electrolyte*. The phenomena resulting in the produced performances are explained and future prospects in this work are shown.
Keywords: Electrochemistry; Electrochemical Energy Storage; Supercapacitors; Ion mobility; Nitrogen-doped carbon materials