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 multiwalled 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.

Voltammetric and impedimetric behaviour of phytosynthesized nickel nanoparticles

“…EIS is a complementary technique to CV; while the latter represents only part of an electrochemical system, the results of the EIS measurements give a fuller description of the electrochemical system, [33,34] providing vital information about processes occurring at the electrode/electrolyte interface. 4-.…”

Synthesis of Li[Li<sub>0.13</sub>Mn<sub>0.464</sub>Ni<sub>0.203</sub>Co<sub>0.203</sub>]O<sub>2</sub> Cathode Material by Hydrothermal Treatment Method

“…While the sample B shows a low discharge capacity of 155.9 mAh•g -1 at 2.0 C, which is only 75.8% of the discharge capacity at 0.1 C. The enhanced rate capacity of the sample A is mainly attributed to the less aggregation particles which could provide more paths for lithium-ion de/intercalation. Electrochemical impedance spectroscopy (EIS) of the fully charged coin cells (4.8 V) is measured to investigate the interface reaction and the process of lithium intercalation/deintercalation into electrode [53,54]. The EIS profiles of the sample A were obtained when the cell cycled for 1 and 50 times respectively at 0.1 C between 2.0-4.8 V. The EIS profiles of the sample A are presented in Figure 8.…”

Nanostructured Cobalt(II) Tetracarboxyphthalocyanine Complex Supported Within the MWCNT Frameworks: Electron Transport and Charge Storage Capabilities

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1Introduction Cobalt(II)tetracarboxyphthalocyanine (CoTCPc) is am embero ft he metallophthalocyanine (MPc) family known for theiru nique physico-chemical properties.M Pc complexes are well-studied N4-macrocyclic compounds which have found application in virtuallye very area of moderns cience and technology,r angingf rom photocopying and laser printing, electrochromic and electroluminescent display devices,c omputer re-writable compact discs and information storage systems, liquid crystal display devices,p hotovoltaic cells,f uel cells,m olecular electronics, semi-conductor devices,s ensors, photosensitization processes [1-8] and capacitor performance [9] to mention but af ew.C onsidering the remarkablep roperties of the MPc in electronics and electrochemical systems, oneo f the elegant strategies to harness and expand their usability in aw ide range of devices is to tailor them as surfaceconfined thin molecular films.S urface-confined CoTCPc in particular has been reported to exhibite nhanced redox or electrocatalytic properties due to its ring substituents (-carboxyl group)c omparedt ow hen it is substituted with tert-butyl, sulfonate,a mino or nitro groups [ 4].One of the ways to improve the redox properties and application of surface-confined MPc complexes is the integration with conductive materials,n otably the carbon nanotubes (CNTs) [6,[10][11][12][13][14].T hese CNT-MPc integrated nanostructures have also been reported to show very good charge storage properties [15][16][17]. MPc is aflat molecule with 18 p-electrons,t hus it is easy for the CNTs to co-ordinate with MPc via p-p interactions.R ecently,w e reviewed the smart integration of nanostructuredm etallophthalocyanines (nanoMPc) on CNT supports [18].

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“…One of the ways to improve the redox properties and application of surface-confined MPc complexes is the integration with conductive materials,n otably the carbon nanotubes (CNTs) [6,[10][11][12][13][14].T hese CNT-MPc integrated nanostructures have also been reported to show very good charge storage properties [15][16][17]. MPc is aflat molecule with 18 p-electrons,t hus it is easy for the CNTs to co-ordinate with MPc via p-p interactions.R ecently,w e reviewed the smart integration of nanostructuredm etallophthalocyanines (nanoMPc) on CNT supports [18].…”