title: Room-temperature carbide-derived carbon synthesis by electrochemical etching of MAX phases.
abstract: Porous carbons are widely used in energy storage and gas separation applications, but their synthesis always involves high temperatures. Herein we electrochemically selectively extract, at ambient temperature, the metal atoms from the ternary layered carbides, Ti3 AlC2 , Ti2 AlC and Ti3 SiC2 (MAX phases). The result is a predominantly amorphous carbide-derived carbon, with a narrow distribution of micropores. The latter is produced by placing the carbides in HF, HCl or NaCl solutions and applying anodic potentials. The pores that form when Ti3 AlC2 is etched in dilute HF are around 0.5 nm in diameter. This approach forgoes energy-intensive thermal treatments and presents a novel method for developing carbons with finely tuned pores for a variety of applications, such as supercapacitor, battery electrodes or CO2 capture.
authors.affiliation: A. J. Drexel Nanomaterials Institute, and Materials Science and Engineering Department, Drexel University, 3141 Chestnut Street, Philadelphia, PA 19104 (USA).
authors.forename: Maria R
authors.initials: MR
authors.lastname: Lukatskaya
authors.forename: Joseph
authors.initials: J
authors.lastname: Halim
authors.forename: Boris
authors.initials: B
authors.lastname: Dyatkin
authors.forename: Michael
authors.initials: M
authors.lastname: Naguib
authors.forename: Yulia S
authors.initials: YS
authors.lastname: Buranova
authors.forename: Michel W
authors.initials: MW
authors.lastname: Barsoum
authors.forename: Yury
authors.initials: Y
authors.lastname: Gogotsi
keywords: carbides; carbon; cyclic voltammetry; electrochemistry; oxidation