MnO1.88/R-MnO2/Ti3C2(OH/F)x composite electrodes for high-performance pseudo-supercapacitors prepared from reduced MXenes†
Abstract
MnO1.88/MnO2/Ti3C2Tx composites on Ti3C2Tx (MXenes) were synthesized for potential applications as supercapacitor electrodes. A composite with a cotton candy-like morphology was formed on nanometer-sized Ti3C2Tx flakes by redox reaction using KMnO4 at room temperature, where Ti3C2Tx acts both as a molecular template and as a reducing agent. MnO1.88/MnO2/Ti3C2Tx has a high specific capacity of 312 F g−1 at 1 A g−1, and the capacity retention was over 91% after 5000 charge–discharge cycles. As such, the facile preparation of MnO1.88/MnO2/Ti3C2Tx composites promotes the highly specific pseudo-capacitance of MXenes, which have emerged as highly promising electrode materials.