title: Biobased Nano Porous Active Carbon Fibers for High-Performance Supercapacitors.
abstract: Activated carbon fibers (ACFs) with different pore structure have been prepared from wood sawdust using the KOH activation method. A study was conducted to examine the influence of the activation parameters (temperature, alkali/carbon ratio, and time) on the morphology and structure of the as-prepared ACFs developed in the process of pore generation and evolution. Activation temperature was very essential for the formation of utramicropores (<0.6 nm), which greatly contributed to the electric double layer capacitance. The significance of metallic potassium vapor evolved when the temperature was above 800 °C, since the generation of 0.8- and 1.1 nm micropores cannot be ignored. When the the KOH/fiber ratio was increased and the activation time was prolonged, to some extent, the micropores were enlarged to small mesopores within 2-5 nm. The sample with the optimal condition exhibited the highest specific capacitance (225 F g(-1) at a current density of 0.5 A g(-1)). Its ability to retain capacitance corresponding to 10 A g(-1) and 6 M KOH was 85.3%, demonstrating a good rate capability. With 10 000 charge-discharge cycles at 3 A g(-1), the supercapacitor kept 94.2% capacity, showing outstanding electrochemical performance as promising electrode material.
authors.affiliation: College of Materials Science and Technology, Beijing Forestry University , Tsinghua East Road 35, Haidian 100083, Beijing, China.|School of Human Ecology, The University of Texas at Austin , Austin, Texas 78712, United States.
authors.forename: Yuxiang
authors.initials: Y
authors.lastname: Huang
authors.affiliation: Materials Science and Engineering Program and Department of Mechanical Engineering, The University of Texas at Austin , Austin, Texas 78712, United States.
authors.forename: Lele
authors.initials: L
authors.lastname: Peng
authors.affiliation: School of Human Ecology, The University of Texas at Austin , Austin, Texas 78712, United States.
authors.forename: Yue
authors.initials: Y
authors.lastname: Liu
authors.affiliation: College of Materials Science and Technology, Beijing Forestry University , Tsinghua East Road 35, Haidian 100083, Beijing, China.
authors.forename: Guangjie
authors.initials: G
authors.lastname: Zhao
authors.affiliation: School of Human Ecology, The University of Texas at Austin , Austin, Texas 78712, United States.
authors.forename: Jonathan Y
authors.initials: JY
authors.lastname: Chen
authors.affiliation: Materials Science and Engineering Program and Department of Mechanical Engineering, The University of Texas at Austin , Austin, Texas 78712, United States.
authors.forename: Guihua
authors.initials: G
authors.lastname: Yu
keywords: activated carbon fibers; capacitance; electric double layer capacitor; lignocellulose biomass; pore evolution; wood sawdust