Quinones as Rechargeable and Regenerable Battery Cathode Materials

Alt, H.; Binder, H.; Köhling, A.; Sandstede, G.

doi:10.1149/1.2407873

Cited by 58 publications

(67 citation statements)

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“…The activity of the last group is about equal to that of Norit BRX itself. Until now it has only been known that CoTPP is more effective than FeTPP, and that the Cu and Ni complexes are inactive [4].…”

Section: The Influence Of the Central Metal The Ligand And Pre-mentioning

confidence: 99%

Oxygen Reduction on Transition‐Metal Porphyrins in Acid Electrolyte I. Activity

Veen

Baar

Kroese

et al. 1981

Ber Bunsenges Phys Chem

111

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The oxygen reduction characteristics of metalloporphyrins adsorbed at monolayer levels on a high surface area carbon, Norit BRX, have been studied in 8 N H,SO, and also in 6 N KOH. In an acid, oxygen reduction activity is found to be correlated with the Me"/Me"' redox potential. Most Co complexes have too high a redox potential, while too low a redox potential is observed for Fe, Ru, Os, Mn, and Cr. Ir porphyrins have the highest activity. In KOH, Ru porphyrins show the best performance. A heat treatment improves activity and stability strongly in an acid, but only mildly in an alkaline solution. A mechanism is proposed for oxygen reduction on transition metal chelates, both in acid and in alkaline solutions.

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Section: The Influence Of the Central Metal The Ligand And Pre-mentioning

confidence: 99%

Oxygen Reduction on Transition‐Metal Porphyrins in Acid Electrolyte I. Activity

Veen

Baar

Kroese

et al. 1981

Ber Bunsenges Phys Chem

111

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“…During the last years the redox mechanism of PANI has been intensively investigated [1][2][3]. Through its conductive properties are well documented [4], while its structure is not yet clear [5,6].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of 5,10,15,20‐Tetrakisphenylporphins on a Carbon Support for the Cathodic Reduction of Oxygen in Fuel Cells

Kirschenmann

Wöhrle

Vielstich

1988

Ber Bunsenges Phys Chem

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Several substituted Fe-and Co-containing tetraphenylporphins 1 were loaded on carbon either by adsorption from acetone or by in situ synthesis on the carbon support. The porphin/carbon combinations were pyrolyzed at 800 "C, The electrocatalytic activities in the reduction of dioxygen were investigated in alkaline (KOH) and aeid (H 2S04 ) solutions using porous Teflon-bonded earbon electrodes impregnated with the catalysts. At 700 mV high current densities of 75 mA/cm 2 in acid solution and up to 90 mA/em 2 in alkaline solution were obtained.

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“…In the case of the Fe 2+ , Co 2+ , Ni 2+ and Cu 2+ metal centers in square-planar geometry all have filled d xz and d yz orbitals, whereas only Fe 2+ has an empty d z 2 orbital, and Co 2+ has a half-filled d z 2 orbital. [8] Some ingenious complexes have been synthesized in the hopes of converting cobalt(II) porphyrins into electrocatalysts capable of reducing oxygen directly to water at high positive potentials. Cofacial dicobalt porphyrins, for example, have been shown to catalyze the reduction of oxygen to water through direct interaction of both metal centers with the two oxygen atoms of O 2 .…”

Section: Introductionmentioning

confidence: 99%