An　electrochemical　codeposition　method　was　used　to　prepare　a　Pd/MoOx/GC　composite　electrode　that　provides　a　surface　modification　with　catalytic　properties　for　dechlorination　of　4-chlorophenol.　This　method　allows　the　mixing　of　metal　and　oxide　on　a　microscopic　level　to　disperse　the　Pd　microparticles　into　the　molybdenum　oxide　on　a　glassy　carbon,　and　the　SEM　result　showed　the　uniform　dispersion　of　the　particles　on　glassy　carbon　(particle　sizes　are　about　100-200　nm),　X-ray　photoelectron　spectroscopy　of　the　composite　electrode　presented　a　broad　peak　in　the　Mo　(3d)　region　revealing　the　existence　of　Mo6+　species　as　well　as　lower　valence　states　such　as　Mo5+,　Mo4+.　This　composite　electrode　showed　a　better　performance　for　electrocatalytic　reductive　dechlorination　of　4-chlorphenol　than　Pd/GC.　The　effect　of　current　density　for　dechlorination　was　also　investigated.　(C)　2003　Elsevier　B.V.　All　rights　reserved.