One-Step Synthesis of O-Self-Doped Honeycomb-Like Hierarchically Porous Carbons for Supercapacitors

Abstract

A facile and environmentally friendly approach to produce self-doped hierachically porous carbon as electrode material for high-performance supercapacitor was demonstrated. 3D honeycomb-like hierarchically porous carbon was successfully obtained by one-step carbonization and activation of sodium carboxymethyl cellulose (CMC) via K2CO3. With the optimized temperature of carbonization and activation, the porous carbon material achieved well-shaped hierarchically pores (micro-, meso and macropores) like a honeycomb, ultrahigh specific surface area (1666 m2·g-1), as well as highly O-self-doping (3.6 at.%), endowing an excellent electrochemical properties for the electrode in three-electrode system. The porous carbon electrode material delivered a high specific capacitance of 300.8 F·g-1 at 1 A·g-1, an eminent rate capability of 228.4 F·g-1 at the current density up to 20 A·g-1 and outstanding cycle stability of 94.3% retention after 10000 cycles. Therefore, the CMC derived hierarchical porous carbon activated by K2CO3 would have promising foreground in application of supercapacitors.

Efficient Two-Step Utilization of Organic Matter in Shengli Lignite for Producing Chemicals and Supercapacitor Electrode Materials

“…Carbon materials, such as graphene, , activated carbon, , carbon nanotubes, carbon nanofibers, , and carbon aerogel, are widely used as EDLCs because of their low cost, lightweight, high stability, and high plasticity . In addition, the properties of assembled supercapacitors are closely related to the type of carbon material . PCMs with a simple engraving process, well-developed pore structure, and wide range of feedstock play a dominant role in electrodes.…”

“…22 In addition, the properties of assembled supercapacitors are closely related to the type of carbon material. 23 PCMs with a simple engraving process, well-developed pore structure, and wide range of feedstock play a dominant role in electrodes. Lignite has a 3D macromolecular network structure, which consists of condensed aromatic rings with bridged linkages and aliphatic side chains.…”

Preparation of N/O-codoped quinoline pitch-based porous carbons for high-quality supercapacitor electrodes

“…These groups can significantly improve the hydrophilicity of carbon materials, thus ensuring the rapid migration of electrolyte ions and reducing the electrode/ electrolyte interfacial impedance. [32][33][34][35] However, when N and O heteroatoms are doped in the carbon skeleton network, they principally exist in the form of pyridinic-N (N-6), pyrrolic-N (N-5), graphitic-N (N-Q), pyridinic-N + -O À (N-O), and carbonyl, benzoquinonyl, and ether groups. 36,37 In most cases, this doping can facilitate electronic transfer, thereby reducing internal impedance.…”

Bio-Based Carbon Materials for High-Performance Supercapacitors

“…As technology advances and people’s living standards improve, energy is being consumed, fossil fuels are in short supply, and environmental problems are becoming more and more prominent. Based on this, it is essential to research and create new high-performance green energy storage and conversion devices [ 1 ]. It is well known that supercapacitors (SCs) and electrochemical double-layer capacitors (EDLCs) both have fantastic energy storage performance, and they can provide sufficient energy for high-power (10 kW/kg) applications with fast charging/discharging [ 2 ].…”