A crumpled sphere-like NiMn metal-organic phosphate as electrode material for electrochemical supercapacitor

We synthesized NixMny-MOPhs with varying proportions of Ni and Mn, and through a comprehensive set of characterizations and electrochemical testing techniques, we have confirmed that the morphology and electrochemical supercapacitor performance of NixMny-MOPhs are significantly influenced by the proportions of Ni and Mn. [Display omitted] •The crumpled sphere-like Ni10Mn1-MOPh was fabricated using a simple one-step preparation process.•This study represents the utilization of the crumpled sphere-like Ni10Mn1-MOPh as an electrode material in supercapacitor.•The varying proportions of Ni and Mn lead to diverse morphology and performance of NixMny-MOPhs in the supercapacitor. The present study investigates a crumpled sphere-like binary Ni Mn metal–organic phosphate (Ni10Mn1-MOPh) sample for its potential application in electrochemical supercapacitors. Additionally, control samples of NixMny-MOPhs with varying proportions of Ni and Mn were also prepared. It is noteworthy that NixMny-MOPh samples with different molar ratios of Ni:Mn display different morphologies and electrochemical supercapacitor properties. Compared with other as-prepared NixMny-MOPhs, Ni10Mn1-MOPh modified electrode showed more complete sphere, bigger active surface area, and faster electrical conduction, applying for the hydrothermal condition is pivotal factor for the practical applications of NixMny-MOPhs. The synthesized Ni10Mn1-MOPh demonstrates a remarkable specific capacitance value of 986.8F/g at 2 A/g and exhibits exceptional reversible charge/discharge capability with an approximate retention rate of 81.9 % after 5000 cycles at 6 A/g. As a proof-of-concept, we synthesized bare Ni-MOPh and MnO2, thereby further confirming that the optimization electrochemical performance is associated with the synergistic effect of diverse active metals, their respective ratios, and the appropriate morphology of the NiMn-MOPh samples.