Two-dimensional Mg-doped MnO2@ carbon cloth nanosheets for high performance typical flexible solid supercapacitor

Metal doping MnO2 has better electrochemical performance than pure MnO2. We have demonstrated a facile approach for synthesizing Mg-doped MnO2@ carbon cloth via a typical hydrothermal reaction. The intercalation of Mg2+ rapidly increases the operating window to 1.2 V. Compared to other metal ions (Co2+, Fe3+, Bi2+, Al3+, Cr2+) doping, Mg2+ doping further increases the lattice defects of MnO2, achieving more vacancies, and effectively improving the performance of MnO2. As a flexible symmetric solid supercapacitor (FSSSC), the voltage window can be extended to 2.2 V, and the energy density of FSSSC reaches 2.06 mW h/cm(3) at 43.94 mW/cm(3). The device can illuminate a 2.2 V LED successfully, showing its huge actual application value. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

Metal-doped MnO2, especially with Mg2+, shows improved electrochemical performance. Intercalation of Mg2+ increases lattice defects in MnO2, leading to enhanced performance. The flexible symmetric solid supercapacitor demonstrates a high energy density and successfully powers an LED, indicating significant practical applications.