scholarly journals KOH activated carbon/graphene nanosheets composites as high performance electrode materials in supercapacitors

RSC Advances ◽  
2014 ◽  
Vol 4 (90) ◽  
pp. 48758-48764 ◽  
Author(s):  
Shengming Yu ◽  
Yueming Li ◽  
Ning Pan
Keyword(s):  
Activated Carbon ◽  
High Performance ◽  
Electrode Materials ◽  
Graphene Nanosheets

Porous Activity of Biomass-Activated Carbon Enhanced by Nitrogen-Dopant Towards High-Performance Lithium Ion Hybrid Battery-Supercapacitor

2021 ◽  
Author(s):  
Juan Yu ◽  
Xuyang Wang ◽  
Jiaxin Peng ◽  
Xuefeng Jia ◽  
Linbo Li ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Energy Storage ◽  
Pore Structure ◽  
High Performance ◽  
Electrode Materials ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Utilization Efficiency ◽  
Energy Storage Devices ◽  
Storage Devices

Abstract Biomass-activated carbon materials are promising electrode materials for lithium-ion hybrid capacitors (LiCs) because of their natural hierarchical pore structure. The efficient utilization of structural pores in activated carbon is very important for their electrochemical performance. Herein, porous biomass-activated carbon (PAC) with large specific surface area was prepared using a one-step activation method with biomass waste as the carbon source and ZnCl2 as the activator. To further improve its pore structure utilization efficiency, the PAC was doped with nitrogen using urea as the nitrogen source. The experimental results confirmed that PAC-1 with a high nitrogen doping level of 4.66% exhibited the most efficient pore utilization among all the samples investigated in this study. PAC-1 exhibited 92% capacity retention after 8000 cycles, showing good cycling stability. Then, to maximize the utilization of high-efficiency energy storage devices, LiNi0.8Co0.15Al0.05O2 (NCA), a promising cathode material for lithium-ion batteries with high specific capacity, was compounded with PAC-1 in different ratios to obtain NCA@PC composites. The NCA@PC-9 composite exhibited excellent capacitance in LiCs and an energy density of 210.9 Wh kg-1 at a high power density of 13.3 kW kg-1. These results provide guidelines for the design of high-performance and low-cost energy storage devices.

Layer-Stacking Activated Carbon Derived from Sunflower Stalk as Electrode Materials for High-Performance Supercapacitors

2018 ◽  
Vol 6 (9) ◽  
pp. 11397-11407 ◽  
Author(s):  
Xiaodong Wang ◽  
Sining Yun ◽  
Wen Fang ◽  
Chen Zhang ◽  
Xu Liang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
High Performance ◽  
Electrode Materials ◽  
Layer Stacking

scholarly journals Supercapacitor Electrodes from Viscose-Based Activated Carbon Fibers: Significant Yield and Performance Improvement Using Diammonium Hydrogen Phosphate as Impregnating Agent

2020 ◽  
Vol 6 (2) ◽  
pp. 17
Author(s):  
Stefan Breitenbach ◽  
Alexander Lumetzberger ◽  
Mathias Andreas Hobisch ◽  
Christoph Unterweger ◽  
Stefan Spirk ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Carbon Fibers ◽  
High Performance ◽  
Electrode Materials ◽  
High Energy ◽  
Activated Carbon Fibers ◽  
Hydrogen Phosphate ◽  
Diammonium Hydrogen Phosphate ◽  
Viscose Fibers ◽  
Diammonium Hydrogen

Viscose fibers were impregnated with different concentrations of diammonium hydrogen phosphate (DAHP), carbonized, activated, and tested as high-performance electrode materials for supercapacitors. The yield of these activated carbon fibers (ACFs) could be increased by a factor of 14 by using DAHP compared to ACF without impregnation. These specific activation procedures yielded a high specific surface area of more than 2700 m2·g−1 with a pore size distribution (PSD) suitable for use as a supercapacitor electrode. The electrode materials were implemented in symmetric supercapacitors using TEMA BF4 as electrolyte and cyclic voltammetry measurements showed high specific capacitances of up to 167 F·g−1. Furthermore, the devices showed high energy densities of up to 21.4 W·h·kg−1 and high-power densities of up to 8.7 kW·kg−1. The supercapacitors featured high capacity retention (96%) after 10,000 cycles. These results show that ACFs made of viscose fibers, previously impregnated with DAHP, can be used as high-performance electrodes in supercapacitors for energy storage applications.

High performance aqueous supercapacitor based on nitrogen-doped coal-based activated carbon electrode materials

2020 ◽  
Vol 580 ◽  
pp. 77-87 ◽  
Author(s):  
Duo Dong ◽  
Yongsheng Zhang ◽  
Yi Xiao ◽  
Tao Wang ◽  
Jiawei Wang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
High Performance ◽  
Electrode Materials ◽  
Carbon Electrode ◽  
Nitrogen Doped
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