High-performance pseudocapacitors enabled by H+/OH− mixed ion conductors in perovskite electrodes

Abstract

Oxygen-ion intercalation perovskites in pseudocapacitors suffer from slow ion transport and instability. Here, we propose a SrZr_0.8Y_0.2O₃-based perovskite, a H⁺/OH⁻ mixed ion conductor, achieving 1164.9 F g⁻¹ at 2 A g⁻¹. The Mo doping strategy enhances the capacitance to 1467.7 F g⁻¹ at 2 A g⁻¹, demonstrating superior performance and stability for advanced supercapacitors.