Synthesis, Structure and Electrochemical Properties of Ca Doped Lanthanum Manganite Powders As Supercapacitor Electrode Material

摘要

The rapidly increasing energy demand due to the depletion of fossil fuels and worsening environmental pollution have led to recent research interests on clean energy sources, energy conversion, and energy-storage systems. Therefore, supercapacitors also referred as electrochemical capacitors have gained a great deal of attention in industry as well as academia compared with the batteries and fuel cells because of the significant properties such as high power density produced by fast charge/discharge rate and long cycle life. Generally, conducting polymers, carbon-based materials and metal oxides have been extensively investigated to develop the most efficient electrode material for supercapacitors. Among the metal oxides, the perovskite oxides with ABO_3 crystal structure has drawn lots of interest owing to exhibiting reversible faradaic surface reactions, their high intrinsic capacity, excellent thermal stability and also low cost among pseudocapacitive materials. On the other hand, LaMnO_3 perovskite is a promising material in terms of accessibility, environmental friendliness, and also its capability to store charges through intercalation and reversible faradaic surface reactions in vacancies (both oxygen and cation).