A new straightforward uncalcined approach for morphology modulating to enhance the electrical capacity performance of Co-MOF. (1st September 2021)

• Record Type: Journal Article
• Authors: Zhang, Haiyang; Sun, Ying; Zhang, Xueqin; Yang, Hong; Lin, Baoping
• Is Part Of: Electrochimica acta. Volume 389(2021)
• Publication Date: 2021-09-01
• Subjects: Nano-sized MOF -- Supercapacitor -- Co-BTC nanoparticle -- Self-assemble MOF microspheres -- CNTs@Co-BTC microsphere; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2021.138684
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: Development of low-energy-consumption and low-cost process to prepare high-performance uncalcined MOF-based electrode materials is in line with the concept of green synthesis. We present here an uncalcined strategy of reorganizing the nano-sized MOF into a stable structure by anion intervention and doping with conductive substances to improve the conductivity. Three MOF electrode materials of Co-BTC nanoparticles (CBN), Co-BTC microspheres (CBM) and CNTs@Co-BTC microspheres (CCBM) have been prepared by a one-step approach of solvothermal. Results reveal that the introduction of phosphomolybdic acid (POM) can induce Co-BTC nanoparticles self-assemble into microspheres, which can provide CBM a superior specific capacitance compared to CBN. And doping with CNTs can further improve the electrochemical performance in term of the capacitance. Consequently, CCBM holds the highest specific capacitance as 553.3 F g −1 at 1 A g −1, and keeps an outstanding cyclic stability that retention of capacitance after 5000 cycles is around 90%.