Zheng, J.; Zhao, H.; Guo, X.; Jin, X.; Wang, L.; Dong, S.; Chen, J. Enhanced Electrochemical Performance of LaMnO3 Nanoparticles by Ca/Sr Doping. Coatings2024, 14, 20.
Zheng, J.; Zhao, H.; Guo, X.; Jin, X.; Wang, L.; Dong, S.; Chen, J. Enhanced Electrochemical Performance of LaMnO3 Nanoparticles by Ca/Sr Doping. Coatings 2024, 14, 20.
Zheng, J.; Zhao, H.; Guo, X.; Jin, X.; Wang, L.; Dong, S.; Chen, J. Enhanced Electrochemical Performance of LaMnO3 Nanoparticles by Ca/Sr Doping. Coatings2024, 14, 20.
Zheng, J.; Zhao, H.; Guo, X.; Jin, X.; Wang, L.; Dong, S.; Chen, J. Enhanced Electrochemical Performance of LaMnO3 Nanoparticles by Ca/Sr Doping. Coatings 2024, 14, 20.
Abstract
In this paper, the sol−gel method was used to synthesize powders of LaMnO3 (LMO), La0.85Ca0.15MnO3 (LCM), and La0.85Sr0.15MnO3 (LSM). We investigated the impact of substituting Ca and Sr at the A−site on the perovskite crystal structure and electrochemical capabilities of LMO. LCM retained its orthogonal structure in comparison to the parent LMO components, whereas LSM transitioned to a rhombic structure. At 0.5 A/g, the specific capacitance of LCM and LSM electrodes is 185.5 F/g and 248 F/g, respectively.The specific capacitance of LCM was more three times than that of the LMO electrode. Among the three samples (LMO, 22.25 m2 g−1; LSM, 31.56 m2 g−1), the LCM sample exhibited the highest specific surface area of 38.79 m2 g−1. The charge transfer resistances of the LMO, LCM, and LSM are 0.48 Ω, 0.36 Ω, and 0.38 Ω, correspondingly. The LCM electrode exhibits the greatest capacitance performance due to its more refined morphology, increased concentration of oxygen vacancy, and more complete utilization of the perovskite bulk structure. The above results demonstrate that Ca or Sr substitution of A−site compounds has great potential for supercapacitor applications.
Chemistry and Materials Science, Materials Science and Technology
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
