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Present study reports the electrochemical behavior of BiNi _0.6 Mn _0.4 O _3 nanostructures synthesized via citric acid and ethylene glycol assisted hydrothermal process at low temperature calcination of 400 ^o C. Raman spectroscopy and Rietveld refinement have confirmed BiNi _0.6 Mn _0.4 O _3 to crystallize in tetragonal phase with $P\mathop{4}\limits^{\unicode{x00305}}$ 2 _1 c space group symmetry. X-ray photoelectron spectroscopic analysis showed the presence of ‘B’ cations, Ni and Mn in (+2) and (+4) oxidation states, respectively, which mainly contributed to faradaic reactions as observed in CV curves. The specific capacitance of BiNi _0.6 Mn _0.4 O _3 electrodes has been found to be ∼243 F g ^−1 at the current density of 1 A g ^−1 in a 6 M KOH aqueous solution. The nanostructured electrodes showed a cyclic stability of ∼70% after 4000 charge–discharge cycles at the current density of 6 A g ^−1 .