Particle size dependence of the electrochemical properties of SrMnO3 supercapacitor electrodes

In this letter, we report on the simple process of preparing perovskite oxide SrMnO3 and the studying of the size effect on electrochemical properties for high-performance supercapacitor electrode. The high-crystalline micro-sized and nano-sized perovskite oxide SrMnO3 particles were successfully synthesized by a simple solid-state reaction, followed by a simple size reduction using high-energy ball milling. The electrochemical properties of the SrMnO3 had intriguing results on both sizes of particle, especially when comparing between before and after cycles. After a size reduction, the specific capacitance of the particles increased approximately twofold. Interestingly, the micro-sized SrMnO3 gained similar to 500% its initial specific capacitance after 3000 successive cycles due to electrochemical nano-feature activation and oxygen-vacancy production, while the specific capacitance for the nano-sized SrMnO3 remained almost unchanged. Our work suggested a cost-effective and simple technique for high-performance perovskite-based supercapacitor electrodes by achieving the desired performance.

Automated summary

The study found that preparing SrMnO3 oxide particles through solid-state reaction followed by size reduction using high-energy ball milling can significantly enhance the electrochemical properties of supercapacitor electrodes. After successive cycles, the specific capacitance of micro-sized SrMnO3 increased by approximately 500%, while that of nano-sized SrMnO3 remained almost unchanged, providing a simple and effective technique for high-performance supercapacitor electrodes.