Rice-like and rose-like zinc silicates anchored on amorphous carbon derived from natural reed leaves for high-performance supercapacitors

3D N, S, P-doped rice-like C-Zn4Si2O7(OH)(2)center dot H2O (C-ZnSi-N-2) and rose-like C-Zn2SiO4 (C-ZnSi-CO2) are derived from reed leaves and used for application in supercapacitors. The as-prepared C-ZnSi architectures with a large number of hierarchical pores and high specific surface area from reed leaves have outstanding electrochemical performance. The obtained C-ZnSi-N-2 shows 341 F g(-1) at the current density of 0.5 A g(-1), while the C-ZnSi-CO2 exhibits 498 F g(-1), and both of the C-ZnSi materials significantly retain above 99% of their capacitance after 10 000 cycles. Furthermore, the flexible solid-state asymmetric supercapacitors (ASCs) synthesized from C-ZnSi and activated carbon (denoted as C-ZnSi-N-2//AC and C-ZnSi-CO2//AC) achieve a high capacitance (405 and 194 mF cm(-2) at the current density of 2 mA cm(-2), respectively). Besides, the ASC devices show good cycling stability for 7300 cycles with 73% and 77% capacitance retention. The results presented in this study indicate that the N, S, P-doped C-ZnSi architectures from natural reed leaves are promising and efficient materials for manufacturing high performance supercapacitors.

Automated summary

The N, S, P-doped C-ZnSi architectures derived from natural reed leaves show promising electrochemical performance for high performance supercapacitors, with exceptional capacitance retention and cycling stability. The as-prepared C-ZnSi materials exhibit a large number of hierarchical pores and high specific surface area, demonstrating outstanding potential for application in supercapacitors.