Binder-free Ni-doped In/Mn oxalate electrode for next-generation supercapacitors

The worth of electrochemical energy storage systems is significantly influenced by the nature of the electrode material. In this work, metal oxalates have emerged as cost-effective and robust candidates for application in supercapacitors. In this context, a binder-free electrode composed of in-situ Ni-doped In/Mn oxalate was synthesized. The nickel foam served a dual function, acting both as a structural framework and as a source of nickel. X-ray diffraction (XRD) analysis verified the crystalline nature of the in-situ Ni-doped In/Mn oxalate. Morphological assessment using scanning electron microscopy (SEM) and transmission electron microscopy (TEM) revealed the presence of a hybrid one-dimensional/two-dimensional morphology within the in-situ Ni-doped In/Mn oxalate. Electrochemical evaluations indicated that the in-situ Ni-doped In/Mn oxalate electrode exhibits characteristics akin to those of a battery, maintaining 88.8 % of its initial capacity. Furthermore, it demonstrated a superior specific capacity, amounting to 1238.3 F g⁻¹ at a current density of 1 A g⁻¹. The inclusion of nickel during the material's synthesis process is posited to significantly augment its overall electrochemical performance and properties. © 2024 Hydrogen Energy Publications LLC.