title: Partially Hydrogenated Graphene Materials Exhibit High Electrocatalytic Activities Related to Unintentional Doping with Metallic Impurities.
abstract: Partially hydrogenated graphene materials, synthesized by the chemical reduction/hydrogenation of two different graphene oxides using zinc powder in acidic environment or aluminum powder in alkaline environment, exhibit high electrocatalytic activities, as well as electrochemical sensing properties. The starting graphene oxides and the resultant hydrogenated graphenes were characterized in detail. Their electrocatalytic activity was examined in the oxygen reduction reaction, whereas sensing properties towards explosives were tested by using picric acid as a redox probe. Findings indicate that the high electrocatalytic performance originates not only from the hydrogenation of graphene, but also from unintentional contamination of graphene with manganese and other metals during synthesis. A careful evaluation of the obtained data and a detailed chemical analysis are necessary to identify the origin of this anomalous electrocatalytic activity.
authors.affiliation: Department of Inorganic Chemistry, University of Chemistry and Technology Prague, 166 28, Prague 6, Czech Republic.
authors.forename: Ondřej
authors.initials: O
authors.lastname: Jankovský
authors.affiliation: Department of Inorganic Chemistry, University of Chemistry and Technology Prague, 166 28, Prague 6, Czech Republic.
authors.forename: Alena
authors.initials: A
authors.lastname: Libánská
authors.affiliation: Department of Inorganic Chemistry, University of Chemistry and Technology Prague, 166 28, Prague 6, Czech Republic.
authors.forename: Daniel
authors.initials: D
authors.lastname: Bouša
authors.affiliation: Department of Inorganic Chemistry, University of Chemistry and Technology Prague, 166 28, Prague 6, Czech Republic.
authors.forename: David
authors.initials: D
authors.lastname: Sedmidubský
authors.affiliation: Institute of Organic Chemistry and Biochemistry AS CR, v.v.i., Flemingovo nám. 542/2, 166 10, Prague 6, Czech Republic).
authors.forename: Stanislava
authors.initials: S
authors.lastname: Matějková
authors.affiliation: Department of Inorganic Chemistry, University of Chemistry and Technology Prague, 166 28, Prague 6, Czech Republic. zdenek.sofer@vscht.cz.
authors.forename: Zdeněk
authors.initials: Z
authors.lastname: Sofer
keywords: electrocatalysis; electrochemistry; graphene; hydrogenation; sensing