Abstract
Cyclic voltammetric investigations of thin films of cobalt(II) phthalocyanine( 1) and cobalt(II)-4,4′,4″,4′″-tetracarboxyphthalocyanine( 2) in N 2-saturated 1 M sulfuric acid solution revealed that both compounds gave irreversibly semi-stable reduction products, R- 1 and R- 2, at around −0.70 V vs sce. Reductions of CO, formaldehyde and formic acid by R- 1 or R- 2 were conducted with vibrating carbon fiber electrode ( cfe) modified with 1 or 2. Products of the reduction of CO were mainly formaldehyde and a small amount of methanol. In the reduction of CO, R- 2/ cfe was ca 17 times more efficient than R- 1/ cfe, which was however more efficient than the former in the reduction of formaldehyde. Reduction of formic acid by R- 2 and R- 1 seemed to be difficult under the conditions. Reduction of CO on the 2/ cfe polarized with rectangular potential pulse (−0.659 V for 5s and 0.20 V vs Ag/AgCl for 85s) produced nearly quantitative yield of formaldehyde and small amount of methanol.
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