Electrochemical and mössbauer investigations of polymeric iron phthalocyanine oxygen electrodes

Blomquist, J.; Helgeson, U.; Moberg, L.C.; Johansson, Lennart; Larsson, Ragnar

doi:10.1016/0013-4686(82)80036-4

Cited by 25 publications

(7 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The catalytic performance of the M-N-C catalysts was mainly ascribed to the most reported MN 4 or MN 2 centers. [58][59][60][61][62]170] Theoretical calculations have been considered as an effective tool to extract detailed reaction information at the molecular scale, and then to elucidate the structural characteristics and catalytic mechanism of the M-N-C catalysts for ORR. [65,[171][172][173][174][175][176][177][178] Quantum chemical modeling is one path forward to reveal and understand the catalytic characteristics for ORR.…”

Section: Oxygen Reduction Reactionmentioning

confidence: 99%

“…The x value can be tuned from 1 to 6, corresponding to the configurations of MN 1 , MN 2 , MN 3 , MN 4 , MN 5 , and MN 6 , respectively. [58][59][60][61][62] In 2003, Schulenburg et al proposed the active site of FeN 2+2 /C in an embedded form, and Charreteur et al fabricated the form in 2008 in a micropore, [58,63] both of which have been used as the most common active sites in density functional theory (DFT) calculations. [64,65] The four N atoms coordinated with an Fe ion in FeN 2+2 /C site belong to the pyridinic type, meaning that ferrous ions (Fe 2+ ) are not electrically compensated by the negative charges provided by carbon and nitrogen.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Metal–Nitrogen–Carbon Catalysts of Specifically Coordinated Configurations toward Typical Electrochemical Redox Reactions

et al. 2021

View full text Add to dashboard Cite

Metal-nitrogen-carbon (M-N-C) material with specifically coordinated configurations is a promising alternative to costly Pt-based catalysts. In the past few years, great progress is made in the studies of M-N-C materials, including the structure modulation and local coordination environment identification via advanced synthetic strategies and characterization techniques, which boost the electrocatalytic performances and deepen the understanding of the underlying fundamentals. In this review, the most recent advances of M-N-C catalysts with specifically coordinated configurations of M-N x (x = 1-6) are summarized as comprehensively as possible, with an emphasis on the synthetic strategy, characterization techniques, and applications in typical electrocatalytic reactions of the oxygen reduction reaction, oxygen evolution reaction, hydrogen evolution reaction, CO 2 reduction reaction, etc., along with mechanistic exploration by experiments and theoretical calculations. Furthermore, the challenges and potential perspectives for the future development of M-N-C catalysts are discussed.

show abstract

Section: Oxygen Reduction Reactionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Metal–Nitrogen–Carbon Catalysts of Specifically Coordinated Configurations toward Typical Electrochemical Redox Reactions

et al. 2021

View full text Add to dashboard Cite

show abstract

“…As an alternative catalyst, special attention has been given to N 4 -metallomacrocycles, which were heat-treated at temperatures ranging from 600 to 1000 °C in inert gas atmospheres to increase the catalytic activity and also the chemical stability. Such a procedure was first published by Jahnke (1976) and Bagotzky (1977), and later adapted by several other authors. − …”

Section: Introductionmentioning

confidence: 99%

Nature of the Catalytic Centers of Porphyrin-Based Electrocatalysts for the ORR: A Correlation of Kinetic Current Density with the Site Density of Fe−N₄ Centers

et al. 2008

View full text Add to dashboard Cite

In this work, it has been shown that structural changes of an as-prepared catalyst enable the assignment of the catalytic centers responsible for the direct and indirect oxygen reduction reaction, respectively, of porphyrinbased electrocatalysts. An iron porphyrin (FeTMPPCl)-based catalyst as well as a catalyst based on H 2 TMPP were prepared using the so-called foaming agent technique (FAT). The obtained iron catalyst was used as a generic material for the post-treatments. Structural changes were analyzed by 57 Fe Mo ¨ssbauer spectroscopy. The catalytic activity toward the oxygen reduction reaction (ORR) was determined using rotating (ring) disc electrode (R(R)DE) experiments. The catalysts exhibit a variation in the iron content between 2.9 and 4.5 wt % caused by the post-treatments. It has been found that the Mo ¨ssbauer spectra of all catalysts can be fitted assuming two different ferrous Fe-N 4 centers, a CFeN 2 center (Fe 2+ , S ) 2) and an Fe 3 C center (Fe 0 ). After the intensities found in the Mo ¨ssbauer spectra were normalized relative to the iron content, a linear correlation between the kinetic current density related to the direct oxygen reduction and the amount of in-plane Fe-N 4 centers is found. Beside this, there is evidence for a correlation between the kinetic current density related to the hydrogen peroxide formation and CFeN 2 centers. Heat-treated carbon-supported iron porphyrin, prepared as reference material, exhibits the same behavior as our FAT catalysts. The correlation enables us to obtain the turnover frequencies for both the direct and the indirect oxygen reduction reaction and to determine the site densities, in which we reach a third of the target value published by Gasteiger et al. (Appl. Catal., B 2005, 56, 9).

show abstract

“…Due to PpPD Fe C with the best ORR activity in the catalysts, we try to find the relationship between the ORR activity of PpPD Fe C and heating temperature during the catalyst synthesis [24][25][26][27][28][29]. In the recent reports, Fe N C NPMCs with the best catalytic activity were heat-treated at 800-900 • C [30][31][32].…”

Section: Effect Of Heating Temperaturementioning

confidence: 98%

Synthesis–structure–performance correlation for poly(phenylenediamine)s/iron/carbon non-precious metal catalysts for oxygen reduction reaction

2016

View full text Add to dashboard Cite

Electrochemical and mössbauer investigations of polymeric iron phthalocyanine oxygen electrodes

Cited by 25 publications

References 15 publications

Metal–Nitrogen–Carbon Catalysts of Specifically Coordinated Configurations toward Typical Electrochemical Redox Reactions

Metal–Nitrogen–Carbon Catalysts of Specifically Coordinated Configurations toward Typical Electrochemical Redox Reactions

Nature of the Catalytic Centers of Porphyrin-Based Electrocatalysts for the ORR: A Correlation of Kinetic Current Density with the Site Density of Fe−N₄ Centers

Synthesis–structure–performance correlation for poly(phenylenediamine)s/iron/carbon non-precious metal catalysts for oxygen reduction reaction

Contact Info

Product

Resources

About

Electrochemical and mössbauer investigations of polymeric iron phthalocyanine oxygen electrodes

Cited by 25 publications

References 15 publications

Metal–Nitrogen–Carbon Catalysts of Specifically Coordinated Configurations toward Typical Electrochemical Redox Reactions

Metal–Nitrogen–Carbon Catalysts of Specifically Coordinated Configurations toward Typical Electrochemical Redox Reactions

Nature of the Catalytic Centers of Porphyrin-Based Electrocatalysts for the ORR: A Correlation of Kinetic Current Density with the Site Density of Fe−N4 Centers

Synthesis–structure–performance correlation for poly(phenylenediamine)s/iron/carbon non-precious metal catalysts for oxygen reduction reaction

Contact Info

Product

Resources

About

Nature of the Catalytic Centers of Porphyrin-Based Electrocatalysts for the ORR: A Correlation of Kinetic Current Density with the Site Density of Fe−N₄ Centers