Electrochemical properties and kinetic studies of sulphur-induced oxygen vacancies in hydrothermally synthesized manganese molybdenum oxide

Abstract

Manganese molybdenum oxide (MnMoO4) has recently garnered significant attention as a promising electrode material for advanced energy storage systems. It is found that the incorporation of oxygen vacancies due to the sulphur doping in MnMoO4led to a larger interlayer spacing, facilitated charge storage kinetics, and maintained structural durability throughout the electrochemical processes. Hence, this work is focused on the hydrothermal synthesis of MnMoO4with the sulphur-induced oxygen vacancies (S-MnMoO4) by secondary thermal heating processes. Structural and morphological characterizations confirmed the successful inclusion of oxygen vacancies in MnMoO4.Further drop casting S-MnMoO4on nickel foam revealed significant improvements in electrochemical performance. It showed a specific capacitance of about 1131F g−1at 1 A/g, which is six-fold that of pristine MnMoO4. S-MnMoO4demonstrated excellent cyclic stability with 90% of capacitive retention across 5000 cycles and a coulombic efficiency of 98%. These results highlight the potential of S-MnMoO4as an efficient electrode material for advanced energy storage applications.