Different Supercapacitive Behavior of Two Glucose-derived Microporous Carbons: Direct Pyrolysis versus Hydrothermal Carbonization
نویسندگان
چکیده
This work compares for the first time the physical and chemical characteristics of activated carbons produced from glucose and hydrothermally carbonized glucose, as well as their performance as electrodes in supercapacitors in aqueous electrolyte (H2SO4). Both KOH-activated carbons exhibit similar textural properties, with BET surface areas of ~ 1400-1500 m/g and a pore volume of ~ 0.70 cm/g, the pore size distribution being centered in the micropore range. When tested as supercapacitor electrodes, the activated carbon produced from hydrothermally carbonized glucose exhibits a superior rate capability due to lower EDR (being able to work at an ultra-high discharge current of 90 A/g), as well as higher specific capacitance (~ 240 F/g vs. ~ 220 F/g for glucose-derived activated carbon at 0.1 A/g). Both supercapacitors have excellent robustness, even for a large voltage cell of 1.2 V in 1 M H2SO4.
منابع مشابه
Facile fabrication of novel highly microporous carbons with superior size-selective adsorption and supercapacitance properties.
A facile approach to fabricate novel highly microporous carbons has been developed by direct carbonization of lowly cross-linked polystyrene. The as-prepared highly microporous carbons demonstrate unusually high micropore rate (97%), high surface area (1108 m(2) g(-1)) and uniform pore size distribution, and thus exhibit excellent size-selective adsorption and electrochemical properties.
متن کاملHCl-Catalyzed Polymerization of Benzoxazine and Chemical Transformations along Pyrolysis to Microporous Carbons in Advanced and Emerging Polybenzoxazine Science and Technology
HCl-Catalyzed Polymerization of Benzoxazine and Chemical Transformations along Pyrolysis to Microporous Carbons in Advanced and Emerging Polybenzoxazine Science and Technology Report Title This chapter describes a room-temperature HCl-catalyzed synthesis of polybenzoxazine aerogels from bisphenol A, formaldehyde and aniline that cuts the typical multi-day high-temperature (?130 oC) route to a f...
متن کاملHydrothermal carbons from hemicellulose-derived aqueous hydrolysis products as electrode materials for supercapacitors.
Acid pretreatment of lignocellulosic biomass, required for bioethanol production, generates large amounts of by-products, such as lignin and hydrolyzed hemicellulose fractions, which have found so far very limited applications. In this work, we demonstrate how the recovered hemicellulose hydrolysis products can be effectively utilized as a precursor for the synthesis of functional carbon materi...
متن کاملDifferent Pathways to Integrate Anaerobic Digestion and Thermochemical Processes: Moving Toward the Circular Economy Concept
As one of the most environmentally friendly and cost-effective method, anaerobic digestion (AD) has been widely studied and developed as a conventional technology to degrade biodegradable materials and produce biogas simultaneously. Various substrate sources are used in this process such as organic fraction of municipal solid waste (MSW), waste activated sludge (WAS), animal manures, agro-indus...
متن کامل