Efficient Oxygen Reduction Reaction Using Ruthenium Tetrakis(diaquaplatinum)Octacarboxyphthalocyanine Catalyst Supported on MWCNT Platform

Abstract

Electrocatalytic reduction of molecular oxygen in alkaline solution using a novel ruthenium tetrakis(diaquaplatinum)octacarboxyphthalocyanine (RuOCPcPt) electrocatalyst supported on multi-walled carbon nanotube electrode has been described. We show that the oxygen reduction activity follows a direct 4-electron transfer process at high kinetic rate constant, 3.57 10 À2 cm s À1. [14][15][16]. Despite the popularity of ruthenium-based electrocatalysts for ORR, as elegantly reviewed recently by Lee and Popov [1], the use of ruthenium phthalocyanine (RuPc) complexes in ORR is virtually unknown. MPc complexes integrated or supported on carbon nanotubes (CNTs) improve electrocatalytic performance of electrodes [17]. In this communication, we report the electrocatalytic reduction of oxygen using a novel ruthenium tetrakis(diaquaplatinum)octacarboxy-phthalocyanine (abbreviated here as RuOCPcPt, Figure 1) as catalyst on a basal plane pyrolytic graphite electrode (BPPGE) platform pre-modified with or without multiwalled carbon nanotubes (MWCNTs). We clearly show that the BPPGE-MWCNTs-RuOCPcPt electrode can enhance the electrocatalytic performance of the ORR in al- Fig. 1. Structure of ruthenium tetrakis(diaquaplatinum) octacarboxy phthalocyanine. Keywords

Synergistic electrochemical activity of titanium carbide and carbon towards fuel cell reactions

“…The catalysts with composition 1 : 1 have best efficacy towards ORR as compared to other compositions and is in line with other voltammetric ndings given earlier. The obtained i k values are comparable with reported values on W 2 C/C 11 ruthenium tetrakis (diaquaplatinum)octacarboxy phthalocyanine modied MWCNT, 52 gold nanoclusters, 53 3 nm gold clusters (3.5 mA cm À2 , at À0.6 V vs. Ag/AgCl) and 7 nm gold clusters (1.5 mA cm À2 at À0.6 V vs. Ag/AgCl). 54 The present studies have used geometric areas for determining the apparent kinetic parameters since we are unable to obtain the electrochemically active area of TiC.…”

Ruthenium Supported on Nitrogen‐Doped Carbon Nanotubes for the Oxygen Reduction Reaction in Alkaline Media

“…where n is the number of electrons transferred, F the Faraday constant (96,485 C mol -1 ), D O the diffusion coefficient of O 2 (1.68 10 -5 cm 2 s -1 ) [7], t the kinematic viscosity of the electrolyte solution (1.1 10 -2 cm 2 s -1 ), C O the dissolved oxygen concentration in the electrolyte solution (1.031 10 -6 mol L -1 ) and x is the rotation rate in rpm [4,7,35,36]. The K-L plots of the N-CNTs, 2Ru/N-CNTs, 5Ru/ N-CNTs, and 10Ru/N-CNTs samples are shown in Figure 6.…”

Electrochemical Capacitors Based on Nitrogen-Enriched Cobalt (II) Phthalocyanine/Multi-walled Carbon Nanotube Nanocomposites

“…The inclusion of CNTs in the composites was reported to have enhanced capacitive behaviour of the composite materials (12)(13)(14). The integration of CNTs with metallo-phthallocyanine (MPc) has been found to be suitable for different applications (21)(22)(23)(24).…”