title: Electrochemical Reduction of CO2 at Metal Electrodes in a Distillable Ionic Liquid.
abstract: The electroreduction of CO2 in the distillable ionic liquid dimethylammonium dimethylcarbamate (dimcarb) has been investigated with 17 metal electrodes. Analysis of the electrolysis products reveals that aluminum, bismuth, lead, copper, nickel, palladium, platinum, iron, molybdenum, titanium and zirconium electroreduce the available protons in dimcarb to hydrogen rather than reducing CO2 . Conversely, indium, tin, zinc, silver and gold are able to catalyze the reduction of CO2 to predominantly carbon monoxide (CO) and to a lesser extent, formate ([HCOO](-) ). In all cases, the applied potential was found to have a minimal influence on the distribution of the reduction products. Overall, indium was found to be the best electrocatalyst for CO2 reduction in dimcarb, with faradaic efficiencies of approximately 45 % and 40 % for the generation of CO and [HCOO](-) , respectively, at a potential of -1.34 V versus Cc(+/0) (Cc(+) =cobaltocenium) employing a dimethylamine to CO2 ratio of less than 1.8:1.
authors.affiliation: ARC Centre of Excellence for Electromaterials Science and School of Chemistry, Monash University, Clayton, Vic 3800, Australia.
authors.forename: Lu
authors.initials: L
authors.lastname: Chen
authors.affiliation: ARC Centre of Excellence for Electromaterials Science and School of Chemistry, Monash University, Clayton, Vic 3800, Australia.
authors.forename: Si-Xuan
authors.initials: SX
authors.lastname: Guo
authors.affiliation: ARC Centre of Excellence for Electromaterials Science and School of Chemistry, Monash University, Clayton, Vic 3800, Australia.
authors.forename: Fengwang
authors.initials: F
authors.lastname: Li
authors.affiliation: ARC Centre of Excellence for Electromaterials Science and School of Chemistry, Monash University, Clayton, Vic 3800, Australia.
authors.forename: Cameron
authors.initials: C
authors.lastname: Bentley
authors.affiliation: CSIRO Minerals Resources Flagship, Clayton, Vic 3168, Australia.
authors.forename: Mike
authors.initials: M
authors.lastname: Horne
authors.affiliation: ARC Centre of Excellence for Electromaterials Science and School of Chemistry, Monash University, Clayton, Vic 3800, Australia.
authors.forename: Alan M
authors.initials: AM
authors.lastname: Bond
authors.affiliation: ARC Centre of Excellence for Electromaterials Science and School of Chemistry, Monash University, Clayton, Vic 3800, Australia. jie.zhang@monash.edu.
authors.forename: Jie
authors.initials: J
authors.lastname: Zhang
mesh_terms: D002219:Carbamates / Q000737:chemistry; D002245:Carbon Dioxide / Q000737:chemistry*; D002384:Catalysis; D004563:Electrochemistry; D004566:Electrodes; D052578:Ionic Liquids / Q000737:chemistry*; D008670:Metals / Q000737:chemistry*; D010084:Oxidation-Reduction
chemical_list: D002219:Carbamates; D052578:Ionic Liquids; D008670:Metals; D002245:Carbon Dioxide
keywords: carbon dioxide; catalysts; electrocatalysis; electrochemical reduction; metals