Chemistry Reference
In-Depth Information
6.12 Electrosynthesis Using
Specific Electrode Materials
6.12.1 Electrochemical Synthesis Using
Hydrophobic Electrodes
6.12.1.1 Hydrophobic Composite-Plated
Electrodes
Most electrodes are hydrophilic, but
hydrophobic electrodes can be prepared by
composite-plating electrodes like Ni, Zn, Pb etc.
in the corresponding metal
salt-poly(tetrafluoroethylene) (PTFE)
dispersion plating bath. Graphite fluoride and
fluorinated pitch other than PTFE are also used
as hydrophobic composite materials. During
plating, the fine hydrophobic particles are
incorporated into the plated layer. The
electrodes thus prepared have good
electroconductivity and their plated layer
surface shows water-repellent properties as well
as mechanical and chemical stability. In
general, hydrogen and oxygen evolution occur
competitively in electrolytic reactions of organic
compounds in an aqueous solution. In
particular, hydrogen evolution readily occurs in
an acidic aqueous solution while oxygen
evolution easily takes place in an alkaline
aqueous solution. Accordingly, it is not easy to
cathodically reduce carbonyl compounds in
aqueous acidic solution and anodically oxidize
alcohols in aqueous alkaline solution. High
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