Improving electrochemical performance of Co-MOF via Cr-doping: Characterization and electrochemical interpretation for supercapacitor applications

Amid the prevailing energy shortage, it is imperative to develop an efficient and environmentally friendly electrode material through simple and cost-effective methods. This investigation emphasizes the significance of the simple solvothermal technique and an ideal elemental ratio in the development of metal-organic frameworks (MOF), which greatly improves the electrochemical performance. MOF received significant interest in the energy storage sector, due to their promising characteristics such as remarkable surface area and porous properties. In this work, a series of Cr-doped Co-MOF were synthesized using an efficient one-step solvothermal method. The experimental results (XRD, FTIR, and XPS) validated that Cr-doping strongly impacts the electronic structure of pristine Co-MOF/NF, markedly improving the electrochemical performance. The Cr1Co-MOF/NF electrode demonstrates ultra-high specific capacitance of 2390 F g⁻¹, and the ASC device (Cr1Co-MOF/NF//AC) achieves an impressive energy density of 43 Wh kg⁻¹ and a power density of 795 W kg⁻¹ at 1 A g⁻¹, with an 88 % capacitance retention after 10,000 charge-discharge cycles.