Temperature dependences of the double layer capacitance of some solid/liquid and solid/solid electrified interfaces. An experimental study

• Published in: Electrochimica acta Vol. 391; p. 138969
• Main Authors: Watzele, Sebastian A., Katzenmeier, Leon, Sabawa, Jarek P., Garlyyev, Batyr, Bandarenka, Aliaksandr S.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 20.09.2021
• Subjects: All-solid-state battery; Electrical double layer capacitance; Fuel cells; Li-ion conductors; Platinum; Solid-state electrolyte; All-solid-state battery; Solid-state electrolyte; Platinum; Fuel cells; Electrical double layer capacitance; Li-ion conductors
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2021.138969

This study investigates the influence of the temperature on the electrical double layer capacitance (CDL) of various materials, which are essential for fuel cells and solid-state Li-ion batteries. Electrochemical impedance spectroscopy is utilized to measure the CDL of polycrystalline Pt/aqueous electrolytes interfaces, cathode catalyst layers of polymer electrolyte membrane fuel cells (PEMFC), and Au or Li electrodes in contact with a solid-state electrolyte (SSE), a prime example for solid-state ionics. Our results show that within the investigated temperature ranges, the CDL decreases with an increase in the temperature for Pt electrodes in an aqueous acidic electrolyte. However, for SSE and PEMFC cathode catalyst layers, the CDL increases with temperature. The CDL behavior with the temperature of herein presented systems is important for understanding and modeling of the interface processes for renewable energy conversion systems such as fuel cells, water electrolyzers, and batteries. [Display omitted]