Structurally distorted perovskite La0.8Sr0.2Mn0.5Co0.5O3-δ by graphene nanoplatelet and their composite for supercapacitors with enhanced stability

Bo-Min Kim; Hyo-Young Kim; Sung-Wan Hong; Won Ho Choi; Young-Wan Ju; Jeeyoung Shin

doi:10.1038/s41598-022-14324-5

Structurally distorted perovskite La_0.8Sr_0.2Mn_0.5Co_0.5O_3-δ by graphene nanoplatelet and their composite for supercapacitors with enhanced stability

Sci Rep. 2022 Jun 16;12(1):10043. doi: 10.1038/s41598-022-14324-5.

Authors

Bo-Min Kim^#¹, Hyo-Young Kim^#², Sung-Wan Hong³, Won Ho Choi⁴, Young-Wan Ju^{5

6}, Jeeyoung Shin^{7

8}

Affiliations

¹ Department of Mechanical Systems Engineering, Sookmyung Women's University, Seoul, 04310, Korea.
² Department of Chemical Engineering, College of Engineering, Wonkwang University, Iksan, 54538, Jeonbuk, Korea.
³ Department of Electronics Engineering, Sogang University, Seoul, 04107, Korea.
⁴ Institute of Advanced Materials and Systems, Sookmyung Women's University, Seoul, 04310, Korea. wonhochoi@sookmyung.ac.kr.
⁵ Department of Chemical Engineering, College of Engineering, Wonkwang University, Iksan, 54538, Jeonbuk, Korea. ywju1978@wku.ac.kr.
⁶ Nanoscale Sciences and Technology Institute, Wonkwang University, Iksan, 54538, Jeonbuk, Korea. ywju1978@wku.ac.kr.
⁷ Department of Mechanical Systems Engineering, Sookmyung Women's University, Seoul, 04310, Korea. jshin@sookmyung.ac.kr.
⁸ Institute of Advanced Materials and Systems, Sookmyung Women's University, Seoul, 04310, Korea. jshin@sookmyung.ac.kr.

^# Contributed equally.

Abstract

Supercapacitors are promising energy storage devices with high charging/discharging speeds and power densities. To improve their poor stability, we fabricated electrodes by integrating perovskite materials (La_0.8Sr_0.2Mn_0.5Co_0.5O_3-δ, LSMCO) possessing redox reaction ability with graphene nanoplatelets exhibiting good electronic properties. One of the resultant composites (L25G70) demonstrated high capacitance and excellent capacitance retention (95% after 5000 cycles). These results are superior to other electrodes (L50G45 and L75G20) containing a larger ratio of LSMCO, even L75G20 did not exhibit supercapacitor behavior after 3000 cycles. GN can induce structural distortion in LSMCO, thereby the high amount of adsorbed oxygen per lattice oxygen can explain the best electrochemical performance of L25G70, while structural collapse rationalized the failure of L75G20. The findings of this study demonstrated that the use of LSMCO can improve the cycling stability of supercapacitors.

Abstract

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