Monolithic metal-based/porous carbon nanocomposites made from dissolved cellulose for use in electrochemical capacitor  

作　　者：Madhav P.Chavhan Arjeta Kryeziu Somenath Ganguly Julien Parmentier 

机构地区：[1]University of Ostrava,Faculty of Science,30.dubna 22,Ostrava 70103,Czech Republic [2]Universitéde Strasbourg,Universitéde Haute-Alsace,Institut de Science des Matériaux de Mulhouse(IS2M),UMR 7361 CNRS-UHA,15 rue Jean Starcky,BP 2488,68057 Mulhouse Cedex,France [3]Indian Institute of Technology Kharagpur,Department of Chemical Engineering,Kharagpur,India

出　　处：《Green Carbon》2024年第1期109-117,共9页绿碳（英文）

摘　　要：Porous metal-based carbon nanocomposites,with a monolithic shape,were prepared by a one-pot synthesis from dissolved cellulose and metallic salts using a simple,cheap,and environmentally friendly route.Their potential performances as electrochemical capacitors were tested with three metal precursors(M=Cu,Mn,and Fe)with two loadings and in an asymmetric cell for the Fe-based carbon material.Interestingly,here soluble metal precursors were not deposited on a hard cellulose template but mixed in a precooled concentrated NaOH solution where cellulose was previously dissolved,allowing for a good dispersion of the metallic species.After a freezing step where concomitant cellulose regeneration and pore ice-templating phenomena took place,followed by a carbonization step,the mixture led to a porous carbon monolith embedding well-dispersed metal-based nanoparticles having a diameter below 20 nm and present as metallic,oxide,or carbide phase(s)according to the element M.These materials were characterized by different physicochemical techniques and electrochemical tests.Their performances as supercapacitors are discussed in light of the specific behaviour of the metal-based phase and its influence on the carbon matrix properties such as mesopore formation and carbon graphitization.An asymmetric energy storage cell assembled with a Fe-based carbon electrode against a carbon xerogel electrode derived from a phenolic resin shows specific energy and power of 18.3 Wh kg^(−1)at 5 mA cm^(−2)and 1.6 kW kg^(−1)at 25 mA cm^(−2),respectively.

关 键 词：CELLULOSE Metal-based carbon nanocomposite Nanoparticles MONOLITH Supercapacitor 

分 类 号：TM53[电气工程—电器] O646[理学—物理化学]