Electrochemical performance of SrMoO4 as electrode material for energy storage systems

Abstract

In this work, strontium molybdenum oxide (SrMoO4) is reported as electrode material for supercapacitors (SCs). The physico-chemical properties of SrMoO4 were investigated and tested for capacity performance by employing cyclic voltammetry (CV), chronopotentiometry (CP), and electrochemical impedance spectroscopy (EIS). SrMoO4 showed significant specific capacity of 384 C g−1 at 5 mVs−1 with good cyclic stability and capacity retention of 91.1% upto 3000 GCD cycles at current density 1 Ag−1. Also, the as-fabricated SrMoO4 showed the coulombic efficiency and energy efficiency of 81.2% and 82.6% respectively over 5000 GCD cycles. The substantial by active surface area and increased abundance of reactive sites, revealed by the morphological analysis contributed for the higher specific capacity. The lowest values of Rs and Rct exhibited by SrMoO4 such as 2.21 Ω and 1.31 Ω, respectively predicted the faster reaction kinetics. Furthermore, symmetric supercapacitor device (SSD) was also assembled and it exhibited a wide operating voltage window of 1.6 V, with an energy density of 67.3 Wh kg−1 at a power density of 3150 Wkg−1. The pseudocapacitive performance of SrMoO4 was attributed to its unique structure, which enabled fast ion /electron transport and low solution resistance. The electrochemical results demonstrated that SrMoO4 could be utilized as electro-active material for SCs.