Electroreductions on silver-based electrocatalysts : the use of Ag Nanoparticles for CHCl3to CH4Conversion
2009
A preliminary investigation on a new class on electrocatalytic
materials for the electroreduction of organic halides is
presented and discussed. The electrocatalysts are based on
silver nanoparticles (Ag_NP), ad hoc synthesised by chemical
reduction of an aqueous silver salt in the presence of six different
stabilising agents. The colloids are then supported on
carbon powder (10% loading) for further characterisation
and use. The electrocatalytic properties of the Ag_NP/carbon
composites towards the dehalogenation of halocompounds
are tested by cyclic voltammetry and by preparative
electrolysis. The hydrodehalogenation of trichloromethane,
extensively studied by this group, is selected as a model
reaction, because of its relevance for the detoxification of
wastes. The voltammetric characterisation is performed in
an aqueous solution, supporting the composites on cavity
microelectrodes. Gas-diffusion electrodes (GDE) based on
the most promising Ag_NP composite – and, for reference,
on a commercial Ag/C oxygen reduction electrocatalyst –
are then tested in an electrolytic process for the progressive
conversion of gaseous trichloromethane to less chlorinated
compounds, and ultimately to methane.
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