Electrocatalytic oxygen reduction by Co(III) porphyrins incorporated in aerogel carbon electrodes

Elbaz, Lior; Korin, Eli; Soifer, L.; Bettelheim, A.

doi:10.1016/j.jelechem.2008.04.017

Cited by 40 publications

(41 citation statements)

References 33 publications

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“…In the case of the Fe‐corrole, the first step reaches the limiting current at approximately 0.6 V and the second at 0.3 V versus RHE. The phenomenon of mixed reaction mechanisms, manifested by multiple catalytic waves, was observed in the past and explained by the presence of different catalytic sites on the electrode surface . This is possible if some of the macrocyclic complex interacts with surface moieties on the carbon support …”

Section: Resultsmentioning

confidence: 95%

Metallocorroles as Non‐Precious Metal Electrocatalysts for Highly Efficient Oxygen Reduction in Alkaline Media

et al. 2016

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A series of non‐precious metal complexes, composed of five first‐row transition‐metal complexes with β‐pyrrole‐brominated 5,10,15‐tris(pentafluorophenyl)corroles [M(tpfcBr8), M=Mn, Fe, Co, Ni, and Cu], was investigated as catalysts for oxygen reduction in an alkaline solution (0.1 m KOH). The corroles were adsorbed on a high surface area carbon powder (BP2000) prior to electrochemical measurements to create a unique composite material. The comparison between the different metal complexes revealed a high oxygen reduction reaction (ORR) catalytic performance in the case of the Fe‐ and Co‐corroles. These complexes reduce oxygen at very low overpotentials (with E1/2=0.79 V and 0.77 V vs. RHE, respectively), which is better than other well‐defined molecular catalysts and comparable to that of Pt on carbon (XC‐72). The mechanism by which the most active complexes catalyze the ORR in alkaline solutions was also studied, disclosing that the dominant reaction path is a four‐electron reduction of molecular oxygen to hydroxide.

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Section: Resultsmentioning

confidence: 95%

Metallocorroles as Non‐Precious Metal Electrocatalysts for Highly Efficient Oxygen Reduction in Alkaline Media

et al. 2016

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“…The surface area 382 m 2 /g (∼ 3.8 m 2 per 1 geometrical cm 2 ) and the surface pore distribution (128 m 2 /g for the micropores (≤ 2 nm) and 254 m 2 /g for the meso-and macropores) were obtained by the Brunauer, Emmet, and Teller (BET) technique, as described elsewhere. 17 Catalytic electrodes containing Pt or PtRu were obtained by filtering repeatedly the BmimBF 4 solutions containing the respective nanoparticles through the CAE sheets. These were then immersed in an alcohol Nafion (5%) solution for 24 h, followed by air drying.…”

Section: Methodsmentioning

confidence: 99%

Carbon Aerogels with Ionic Liquid Stabilized Pt and PtRu Nanoparticles as Electrocatalytic Fuel Cell Electrodes

Iflah

Zilbermann²,

Korin

et al. 2013

ECS Electrochemistry Letters

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Pt and PtRu nanoparticles were prepared by NaBH 4 reduction in 1-n-butyl-3-methylimidazolium tetrafluoroborate and then directly incorporated in carbon aerogel. XRD measurements showed that both Pt and PtRu possess an FCC structure and most of the particles size is in the range 1-3 nm, as observed by TEM. The Pt and PtRu loaded carbon aerogel electrodes exhibited efficient O 2 reduction and methanol oxidation electrocatalysis, respectively. Nanosized materials have attracted extensive attention due to their unique physical and chemical properties. 1 Nanoparticles (NPs) of noble metals, in particular, have shown high catalytic capabilities for reactions of both scientific 2 and industrial importance. 3 The most common method employed for the preparation of metal NPs is the reduction of metal ions in aqueous solutions and if necessary, transferred to organic phases for specific purposes. 4 Ionic liquids (ILs) are ionic compounds with low melting points and unique solvents exhibiting unique properties such as low vapor pressure and chemical and electrochemical stability. 5 Therefore, they are very attractive media for many purposes including media for the preparation of metal nanoparticles (MNPs). 6 ILs can act as supports and stabilizers against agglomeration. 7 MNPs, such as Au NPs have been formed in ILs in the absence of stabilizing reagents and have been applied in electrochemical analysis. 8 Pt and Pt-Ru alloys are widely used as electrocatalysts in H 2 /air and direct methanol fuel cells, respectively. 9 A great deal of effort has been devoted to the synthesis of different nanostructured materials with the goal of improving their catalytic activity and reducing the noble metal quantity loaded on the electrode surface. Catalytic electrodes are usually prepared by deposition of the catalyst on high surface area carbon particles, such as Vulcan XC = 72. 10

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“…[27] This has been explained as a statistical proximity effect, which allows cooperative catalysis by adjacent Mn-oxo porphyrins. [31] This paper describes the spectroscopic and electrochemical properties of self-assembled structures obtained by the interaction of negatively charged carboxylic-rich graphene oxide (CGO) and a positively charged Mn III porphyrin [manganese(III) tetrakis(N-methyl-4-pyridinio)porphyrin, MnTMPyP]. [31] This paper describes the spectroscopic and electrochemical properties of self-assembled structures obtained by the interaction of negatively charged carboxylic-rich graphene oxide (CGO) and a positively charged Mn III porphyrin [manganese(III) tetrakis(N-methyl-4-pyridinio)porphyrin, MnTMPyP].…”

Section: Introductionmentioning

confidence: 99%

Structures Self‐Assembled from Anionic Graphene and Cationic Manganese Porphyrin: Characterization and Application in Artificial Photosynthesis

2014

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Carboxylic-rich graphene oxide (CGO) and Mn III tetrakis(Nmethyl-4-pyridinio)porphyrin (MnTMPyP) form self-assembled leaf-like structures. These were obtained through electrostatic and π-π stacking interactions, as indicated by the redshift of the metalloporphyrin Soret band throughout the pH range of 6-12. Voltammetry and XPS measurements confirmed that CGO does not significantly affect the chemical environment of the metal ion in MnTMPyP. However, the effect of CGO is apparent when determining by rotating ring [a]

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Electrocatalytic oxygen reduction by Co(III) porphyrins incorporated in aerogel carbon electrodes

Cited by 40 publications

References 33 publications

Metallocorroles as Non‐Precious Metal Electrocatalysts for Highly Efficient Oxygen Reduction in Alkaline Media

Metallocorroles as Non‐Precious Metal Electrocatalysts for Highly Efficient Oxygen Reduction in Alkaline Media

Carbon Aerogels with Ionic Liquid Stabilized Pt and PtRu Nanoparticles as Electrocatalytic Fuel Cell Electrodes

Structures Self‐Assembled from Anionic Graphene and Cationic Manganese Porphyrin: Characterization and Application in Artificial Photosynthesis

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