Abstract:
Hydrothermal method was optimized to produce highly efficient, novel MnNiO3/Mn3O4
nanocomposites for water electrolysis process. The predominant peak observed at 36.6o corresponds to
the X-ray crystal plane orientation of (1-10) and confirmed Rhombohedral phase MnNiO3 and other well
resolved peaks attributed to the MnNiO3/Mn3O4 nanocomposites. Vibrational properties and metal oxygen
vibration present in Fourier transform infrared profile around ~570-620 cm-1. The oxygen vacancies and
electron trapping mechanism were revealed from photoluminescence spectra. The combined morphology
of nanorods and distinguished nanopetals was achieved for highly active MnNiO3 nanocatalyst. The band
structure and modification was thoroughly studied by UV visible diffuse reflection spectroscopy and the
observed band gap was 2.8 eV for MnNiO3/Mn3O4 nanocomposites. Cyclic voltammogram and linear sweep
voltammogram studies investigated the redox behaviour and water oxidation nature of the novel
MnNiO3/Mn3O4 nanocomposites. The excellent conductivity and ionic mobility were confirmed by
electrochemical impedance spectroscopy. Long-time durability of 24 h stability test was carried out and
reported for the optimized electrocatalyst. Hence, the present study completely dealt with the preparation
of novel combination of MnNiO3/Mn3O4 nanocomposites using controlled synthesis technique and the
exploration of optimized candidate for efficient water electrolysis process
