Asymmetric Supercapacitor Based on Porous N-doped Carbon Derived from Pomelo Peel and NiO Arrays

Abstract

A three dimensional (3D) porous framework-like N-doped carbon (PFNC) with a high specific surface area was successfully fabricated through ammonia doping and graphitization based on pomelo peel. The obtained PFNC exhibits an enhanced specific capacitance (260 F g(-1) at 1 A g(-1)) and superior cycling performance (capacitance retention of 84.2% after 10000 cycles at 10 A g(-1)) on account of numerous voids and pores which supply sufficient pathways for ion diffusion during cycling. Furthermore, a fabricated asymmetric PFNC//PFN device based on PFNC and porous flake-like NiO (PFN) arrays achieves a specific capacitance of 88.8 F g(-1) at 0.4 A g(-1) and an energy density of 27.75 Wh kg(-1) at a power density of 300 W kg(-1) and still retains 44 F g(-1) at 10 A g(-1) and 13.75 Wh kg(-1) at power density of 7500 W kg(-1). It is important that the device is able to supply two light-emitting diodes for 25 min, which demonstrates great application potential.

Biomass‐Derived Carbon: A Value‐Added Journey Towards Constructing High‐Energy Supercapacitors in an Asymmetric Fashion

“…[150] The authors used the peel of pomelo fruit as ac arbon source, ammonia as ad opant,a nd KOH as an activating agent to produce porous framework-like N-doped carbon (PFNC) material. [150] The authors used the peel of pomelo fruit as ac arbon source, ammonia as ad opant,a nd KOH as an activating agent to produce porous framework-like N-doped carbon (PFNC) material.…”

3D Hierarchical structure Electrodes of MnO2 Nanosheets Decorated on Needle‐like NiCo2O4 Nanocones on Ni Foam as a cathode material for Asymmetric Supercapacitors

“…Figure (G) exhibits CV curves of PPC, BPC, BHC and AC at the scan rates of 5 mV⋅s −1 , in 6.0 M KOH solution. It can be seen that a nearly rectangular shaped loop is obtained at a sweep rate of 5 mV⋅s −1 , which indicates that the materials are typical and ideal capacitive behaviors . It is well known that the integral area in the cyclic voltammetry curve is proportional to the capacitance of the electrode material .…”

Approaching High‐Performance Supercapacitors via Enhancing Pseudocapacitive Nickel Oxide‐Based Materials

“…Qu and co‐worker76 first graphitized pomelo peel and then prepared a 3D porous framework of nitrogen‐doped carbon (PFNC) with a large SSA in ammonia ( Figure ). The resultant PFNC showed high capacitance of 260 F g −1 at 1000 mA g −1 and excellent cycling stability with an 84.2% retention rate after 10 000 cycles at 10 000 mA g −1 .…”

“…a) Schematic diagram of the preparation process for porous carbon framework (PFC) and PFNC materials; b) schematic diagram of the preparation process of PFN and IFN arrays; SEM images of c,d) PFN and e,f) IFN nanostructures. Reproduced with permission 76. Copyright 2016, American Chemical Society…”