Recent advances in iron oxide/carbon composite electrodes for high-performance supercapacitors

The performance of supercapacitors largely depends on the characteristics of electrode materials. Among various electrode materials, iron oxide has been widely used as an electrode material for supercapacitors. However, iron oxide still has problems of low stability and poor conductivity, which seriously hinders its application as an electrode material for high-performance supercapacitors. To solve these problems, one approach is to use carbon materials with good mechanical and electrical conductivity as the carbon skeleton of composite electrode materials and combine them with iron oxide of different crystal structures to obtain composite supercapacitor electrode materials with excellent electrochemical performance. Based on the introduction of the structure and properties of ferrite compounds, this paper comprehensively reviews the preparation methods of iron-based/carbon composite electrode materials. In addition, based on different micro-space dimensional structures, the research progress of iron-based/carbon composite electrode materials in supercapacitors is summarized, and the problems in their application process are pointed out. This comprehensive summary will help promote the research and development of high-performance supercapacitors based on iron-based electrode materials.