Abstract:
In this work, synthesis and investigation on homogeneous catalytic activities for electrochemical reduction (ECR) of carbon dioxide (CO₂) of amino-functionalized Co(II)-, Ni(II)-, and Cu(II)- phthalocyanines were described. Current enhancement under CO₂-saturated condition observed by cyclic voltammetry indicated involvement of all complexes in the ECR of CO₂. Chronoamperometry applying potential of ‒1.6 V vs. Ag/AgCl QRE for 2 h, followed by product analysis by gas chromatography showed that amino-functionalized Co(II)-, Ni(II)-, and Cu(II)-phthalocyanines yielded hydrogen gas (H₂) with %Faradaic efficiency (%FE) of 32%, 35% and 39%, respectively. However, only amino-functionalized Co(II)- and Ni(II)- phthalocyanines yielded carbon monoxide (CO) with %FE of 1.6% and 0.2%, respectively. The results indicated that it is promising to further develop Co(II)-phthalocyanine-based electrocatalytic system for the production of CO while the Cu(II)-phthalocyanine-based one seems to be suitable for H₂ evolution. Keywords:
