Electrochemical performance of two-dimensional Ti3C2-Mn3O4 nanocomposites and carbonized iron cations for hybrid supercapacitor electrodes

In this work, we present a simple two-step synthesis route to develop a cost effective high performance Ti3C2-Mn3O4 nanocomposite via a solvothermal process at 150 degrees C. The characterization of the composite material was obtained via various techniques. Electrochemical performance study of the material as a potential supercapacitor electrode demonstrated a maximum specific capacity of 128 mAh g(-1) at a specific current of 1 A g(-1) in a 6M KOH aqueous electrolyte. A capacity retention of 77.7% of the initial value was recorded after over 2000 galvanostatic cycles at 10 A gg(-1) for the single electrode. More so, the as-prepared nanocomposite sample electrode also showed a relatively stable property with an energy efficiency of 83.5% after cycling tests. Interestingly, an assembled hybrid supercapacitor device with carbonized iron cations (C-FP) and the Ti3C2-Mn3O4 composite delivered a specific capacity of 78.9 mAh g(-1). The device yielded a high energy of 28.3Wh kg(-1) with an equivalent 463.4Wkg(-1) power densityat 1 Ag-1. A good cycling stability performance with an energy efficiency of 90.2% in addition to a 92.6% capacity retention was observed for over 10,000 cycles at specific current of 3 A g(-1) over a voltage window of 1.5 V. (c) 2019 Elsevier Ltd. All rights reserved.