MgxCo1−x(OH)2@C as an electrode for supercapacitors: effect of doping level on energy storage capability

, and excellent cycling stability, with only slight fluctuations around 100% capacitance retention after 30 000 cycles of continuous charge and discharge. This research not only offers guidance on the optimal doping level of the redox-active metal hydroxides for improving supercapacitor performance but also presents a novel method for preparing various metal hydroxides/oxides and their composite forms.