Petal-like and cube-like manganese silicates derived from natural reed leaves for high-performance supercapacitors

Abstract

Different morphologies of 3D N, P, S-doped C–(Mn₂O₃)₃MnSiO₃ (petal-like C–MnSi-0.5 and cube-like C–MnSi-2.0) are derived from natural reed leaves and used in electrochemical supercapacitors. The as-obtained C–MnSi materials have an architecture with huge BET surface area and large number of pore structures and exhibit outstanding electrochemical performance. C–MnSi-0.5 gives 376 F g⁻¹ and C–MnSi-2.0 gives 391 F g⁻¹ at the current density of 0.5 A g⁻¹. Both C–MnSi materials maintain high retention (above 99%) after 10 000 cycles. The SC devices with C–MnSi and activated carbon (C–MnSi-0.5‖AC and C–MnSi-2.0‖AC) achieve high capacities (378 and 458 mF cm⁻² at a current density of 2 mA cm⁻², respectively) and good cycle stabilities (70.2% and 73.8% capacity after 6000 cycles, respectively). The results presented in this study indicate that the N, P, S-doped C–MnSi architectures from natural reed leaves are promising and efficient materials for manufacturing high performance supercapacitors.