Iron( ii ) tetrakis(diaquaplatinum)octacarboxyphthalocyanine supported on multi-walled carbon nanotube platform: an efficient functional material for enhancing electron transfer kinetics and electrocatalytic oxidation of formic acid

Abstract

A novel platinum -based macrocycle , iron( II ) tetrakis(diaquaplatinum)octacarboxyphthalocyanine ( PtFeOCPc ), was synthesised and characterised. The heterogeneous electron transfer and electrocatalytic properties of this functional material towards the oxidation of formic acid have been explored on a graphite electrode platform pre-modified with or without acid-functionalised multi-walled carbon nanotubes (MWCNTs). We prove that PtFeOCPc supported on a MWCNT platform ( MWCNT – PtFeOCPc ) exhibits enhanced electrochemical response in terms of (i) electron transfer towards outer-sphere redox probe , (ii) catalytic rate constant, and (iii) tolerance towards CO poisoning during formic acid oxidation . The results clearly suggest that the MWCNT– PtFeOCPc is a promising platform for potential application as an electrocatalyst for direct formic acid fuel cell .