Graphene: Large scale chemical functionalization by cathodic means

Abstract : Large amounts of graphene were electrochemically functionalized in an adapted frit-separated two-compartment electrolysis cell. The employed technique corresponds to that of a fluidized bed with a dynamic suspension of graphene maintained by an efficient stirring system. A large collector electrode (e.g. a mercury pool or a glassy carbon plate) polarized at a potential adapted to the chemical modification is placed at the center of the cathodic compartment. Modifications are based on two different types of electrochemical reactions: either i) generation of free radicals in situ adding to graphene or ii) the cathodic charge of graphene at the potentials < − 1.8 V vs. Ag/AgCl leading to poly-nucleophilic graphene reactive towards electrophilic reagents present in the solution. Several selected examples underline the interest of this method for building modified graphene materials for further use as deposits on different substrates. The mass modification ratio of graphene could be estimated to be quite high, e.g. one \COOH\ group per 100 graphene carbon atoms (ca 35 phenyl units).
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Viatcheslav Jouikov, Jacques Simonet. Graphene: Large scale chemical functionalization by cathodic means. Electrochemistry Communications, Elsevier, 2014, 46, pp.132 - 136. ⟨10.1016/j.elecom.2014.06.022⟩. ⟨hal-01072461⟩

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