Effects of Crystallographic Structures of Metal-Phthalocyanine on Electrocatalytic Properties of Oxygen Reduction in Acidic Condition

Takase, Satoko; Aoto, Yuki; Ikeda, Daiki; Wakita, Hideaki

doi:10.1007/s12678-019-00553-2

Cited by 13 publications

(10 citation statements)

References 36 publications

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“…Nonetheless, major structural changes are excluded. Along with this, we could not find presence of nanoparticles or crystals formed by π-π stacking 65 – 67 . This fact is also supported by X-ray diffraction (Fig.…”

Section: Introductionsupporting

confidence: 55%

Evidence of carbon-supported porphyrins pyrolyzed for the oxygen reduction reaction keeping integrity

Orellana

Loyola

Marco

et al. 2022

Sci Rep

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Fe(III) 5,10,15,20-(tetraphenyl)porphyrin chloride (FeTPP) and Co(III) 5,10,15,20-(tetraphenyl)porphyrin chloride (CoTPP) were adsorbed on carbon Vulcan and studied as electrocatalysts for the oxygen reduction reaction (ORR) before and after pyrolysis. The pyrolysis process was also simulated through ab initio molecular dynamic simulations and the minimum energy path for the O2 dissociation after the interaction with the metal center of the FeTPP and CoTPP were calculated. After the pyrolysis the FeTPP showed the best performances reducing O2 completely to H2O with increased limiting current and lower overpotential. Tafel slops for the various catalysts did not change after the pyrolytic process suggesting that the mechanism for the ORR is not affected by the heat treatment. TEM images, X-ray diffraction, XPS spectroscopy, 57Fe Mössbauer, and DFT simulations, suggest that there is no breakdown of the macrocyclic complex at elevated temperatures, and that the macro cyclic geometry is preserved. Small variations in the Metal-O2 (M-O2) binding energies and the M–N bond length were observed which is attributed to the dispersive interaction between the macrocycles and the irregular surface of the Vulcan substrate induced by the heat treatment and causing better interaction with the O2 molecule. The theoretical strategy herein applied well simulate and explain the nature of the M–N–C active sites and the performances towards the ORR.

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Section: Introductionsupporting

confidence: 55%

Evidence of carbon-supported porphyrins pyrolyzed for the oxygen reduction reaction keeping integrity

Orellana

Loyola

Marco

et al. 2022

Sci Rep

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“…However, this is just an upper limit since the molecules in the β phase are slightly tilted. A lower estimate for flat-lying molecules might be the stacking distance between parallel molecules, i.e., 0.34 nm . This results in λ = 0.40(5) nm.…”

Section: Results and Discussionmentioning

confidence: 99%

“…A lower estimate for flat-lying molecules might be the stacking distance between parallel molecules, i.e., 0.34 nm. 40 This results in λ = 0.40 (5) nm.…”

Section: Below)mentioning

confidence: 99%

Attenuation of Photoelectron Emission by a Single Organic Layer

Wagner

Zeppenfeld

2022

ACS Appl. Mater. Interfaces

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We report an in situ study of the thin-film growth of cobalt-phthalocyanine on Ag(100) surfaces using photoelectron emission microscopy (PEEM) and the Anderson method. Based on the Fowler–DuBridge theory, we were able to correlate the evolution of the mean electron yield acquired with PEEM for coverages up to two molecular layers of cobalt-phthalocyanine to the global work function changes measured with the Anderson method. For coverages above two monolayers, the transients measured with the Anderson method and those obtained with PEEM show different trends. We exploit this discrepancy to determine the inelastic mean free path of the low-energy electrons while passing through the third layer of CoPc.

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“…A gas-diffusion-type electrodes using PTFE bonded carbon and an electrochemical cell used in the present study were similar to those already reported. 6,36,37 The gas-diffusion-type electrode consists of gas diffusion and reaction layers. The former was based on carbon (60 wt%: AB-7, Denki Kagaku Kogyo K. K.) and Teflon (40 wt%: D-1, Daikin Ind., Ltd.).…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

Bi-functional Oxygen Electrocatalysts Using Mixed-Metal Tungsten-Nitrides in Alkaline Media

2022

Self Cite

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Transition metal-tungsten nitrides (CrWN2, MnWN2, FeWN2, Co3W3N, Ni2W3N) could be synthesized and electrocatalytic properties on electrochemical oxygen reduction and evolution reactions were examined. The oxygen reduction performance was in the order of Co3W3N > MnWN2 > Ni2W3N >> FeWN2 >> CrWN2. while the oxygen evolution was in that of Co3W3N >> CrWN2 > Ni2W3N > MnWN2 >> FeWN2. Then, the Co3W3N gave high bi-functional oxygen electrocatalytic properties. Furthermore, Ni-doped (Co1-xNix)3W3N (x = 0 -1.0) were prepared and it was found that the (Co0.6Ni0.4)3W3N gave the highest bi-functional electrocatalytic properties. The cathode performance was achieved with the electrode containing 32 wt% (Co0.6Ni0.4)3W3N, i. e., the current density as high as 280 mA cm -2 , which was 10 times higher than that of a carbon-only electrode, was obtained at (0.80 V vs. RHE) in 5 mol L -1 KOH at 70 °C. Also, the (Co0.6Ni0.4)3W3N electrode showed high activity to oxygen evolution as high as 300 mA cm -2 at (1.60 V vs. RHE). As it was observed the changes in binding energy at O1s, N1s, W4f, Co2p, and Ni2p spectra among Co3W3N, (Co0.6Ni0.4)3W3N, and Ni2W3N by X-ray photoelectron spectroscopy, the change in electrical properties at the surface of the nitrides should be one of the reasons of the high performance.

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Effects of Crystallographic Structures of Metal-Phthalocyanine on Electrocatalytic Properties of Oxygen Reduction in Acidic Condition

Cited by 13 publications

References 36 publications

Evidence of carbon-supported porphyrins pyrolyzed for the oxygen reduction reaction keeping integrity

Evidence of carbon-supported porphyrins pyrolyzed for the oxygen reduction reaction keeping integrity

Attenuation of Photoelectron Emission by a Single Organic Layer

Bi-functional Oxygen Electrocatalysts Using Mixed-Metal Tungsten-Nitrides in Alkaline Media

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