Controllable preparation of nickel cobalt manganese ternary metal-organic frameworks for high-performance supercapacitor

• Published in: Journal of energy storage 2023-02, Vol.58, p.106395, Article 106395
• Main Authors: Wang, Yu, Xu, Fen, Sun, Lixian, Fang, Songwen, Lao, Jianhao, Zhang, Chenchen, Wei, Siyue, Liao, Lumin, Guan, Yanxun, Xia, Yongpeng, Luo, Yumei, Sun, Yujia, Zou, Yongjin, Yu, Zhaozhe, Shao, Qiwei, Zhu, Yanling, Luo, Yong
• Format: Article
• Language: English
• Subjects: Nanorods; Supercapacitor; Ternary metal MOFs
• ISSN: 2352-152X; 2352-1538
• DOI: 10.1016/j.est.2022.106395

In this study, Ni, Co and Mn metal-organic frameworks (MOFs, Ni2Co1-XMnX-MOFs-S, X = 0, 0.25, 0.5) nanorods are successfully obtained by a one-step hydrothermal method under the aid of C12H25SO4Na (SDS). The morphology and the size of the nanorods can be controlled by changing the doping method and content of Mn, resulting in the different electrochemical performances. The study proves that SDS has a great influence on the capacitance of the ternary metal NiCoMn-MOFs. Research results show that the optimized Ni2Co0.75Mn0.25-MOFs-S displays a capacitance of 1428 F·g−1 at current density of 1 A·g−1. Meanwhile, controlling partial substitution of Mn is beneficial to improve the stability of MOFs, such as the charge-discharge cycle stability of Ni2Co0.75Mn0.25-MOFs-S is high to 83.5 % after 3000 cycles. The energy density of the asymmetric supercapacitor (Ni2Co0.75Mn0.25-MOFs-S//AC) is 38.10 Wh·kg−1 at a power density of 884.38 W·kg−1. In addition, the act of Mn on improving material stability is studied. •The electrochemical performances of Ni2Co1-MOFs-S were optimized by changing the doping method and content of Mn.•C12H25SO4Na (SDS) had a great influence on the capacitance of MOFs.•Partial substitution of Mn is beneficial to improve the stability of MOFs