A ceramic NiO/ZrO2 separator for high-temperature supercapacitor up to 140 °C.

Abstract High-temperature supercapacitors with enhanced charge transportation and capacitances are promising to meet specific requirements for underhood automotive component, oil drilling, military and space applications. However, state-of-the-art supercapacitors are always operated at room temperature due to the thermal instability of the hydrous electrolytes and organic separators. Herein, we present the fabrication of a high-temperature supercapacitor tailored by a ceramic NiO/ZrO 2 separator. This supercapacitor has a working temperature up to 140 °C, a capacitance of 342 F g-1 at current density of 2 A g−1 and good cycling stability over 2000 cycles. The experimental realization of physical proof-of-concept high-temperature supercapacitors may provide new opportunities for markedly improving the capacity of energy storage systems. Graphical abstract Image 1 Highlights • The ceramic NiO/ZrO 2 membranes are made to replace polymer separators. • The ceramic membranes are applied for high-temperature supercapacitors. • A KOH glycerin solution is utilized as a high-temperature electrolyte. • The device yields a maximized capacitance up to 342 F g-1 at 140 °C. • The high-temperature supercapacitors are stable at 140 °C over 2000 cycles. [ABSTRACT FROM AUTHOR]