scholarly journals Influence of the distal guanidine group on the rate and selectivity of O2 reduction by iron porphyrin

2019 ◽  
Vol 10 (42) ◽  
pp. 9692-9698 ◽  
Author(s):  
Arnab Ghatak ◽  
Snehadri Bhakta ◽  
Sarmistha Bhunia ◽  
Abhishek Dey
Keyword(s):  
Reduction Reaction ◽  
Iron Porphyrin ◽  
Iron Porphyrins ◽  
Guanidine Group ◽  
O2 Reduction

The O2 reduction reaction (ORR) catalysed by iron porphyrins with covalently attached pendant guanidine groups is reported.

Tuning the thermodynamic onset potential of electrocatalytic O2 reduction reaction by synthetic iron–porphyrin complexes

2015 ◽  
Vol 51 (49) ◽  
pp. 10010-10013 ◽  
Author(s):  
Sk Amanullah ◽  
Pradip Kumar Das ◽  
Subhra Samanta ◽  
Abhishek Dey
Keyword(s):  
Reduction Reaction ◽  
Iron Porphyrin ◽  
Onset Potential ◽  
Porphyrin Ligand ◽  
O2 Reduction ◽  
Iron Porphyrin Complexes

A porphyrin ligand with two β-pyrrolic electron withdrawing ester groups is synthesized and its Co complex is crystallographically characterized.

scholarly journals Synergic effect on oxygen reduction reaction of strapped iron porphyrins polymerized around carbon nanotubes

2018 ◽  
Vol 42 (24) ◽  
pp. 19749-19754 ◽  
Author(s):  
Manel Hanana ◽  
Hélène Arcostanzo ◽  
Pradip K. Das ◽  
Morgane Bouget ◽  
Stéphane Le Gac ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Iron Porphyrin ◽  
Synergic Effect ◽  
Iron Porphyrins

Carbon nanotube-strapped iron porphyrin hybrids have been synthesized and their electrocatalytic activities for the oxygen reduction reaction have been investigated.

Effect of axial ligands on electronic structure and O2 reduction by iron porphyrin complexes: Towards a quantitative understanding of the "push effect"

2015 ◽  
Vol 19 (01-03) ◽  
pp. 92-108 ◽  
Author(s):  
Subhra Samanta ◽  
Pradip Kumar Das ◽  
Sudipta Chatterjee ◽  
Abhishek Dey
Keyword(s):  
Electronic Structure ◽  
Active Sites ◽  
Reduction Reaction ◽  
Axial Ligand ◽  
Iron Porphyrin ◽  
Axial Ligands ◽  
O2 Reduction ◽  
Thiolate Complexes ◽  
Quantitative Understanding ◽  
Iron Porphyrin Complexes

Axial ligands play a dominating role in determining the electronic structure and reactivity of iron porphyrin active sites and synthetic models. Several properties unique to the cysteine bound heme enzyme, cytochrome P450, is attributed to the "push effect" of the thiolate axial ligand. In this mini-review the ground state electronic structure of iron porphyrins with imidazole, phenolate and thiolate complexes, derived using a combination of spectroscopy and DFT calculations, are discussed. The differences in kinetics and selectivity of oxygen reduction reaction (ORR), catalyzed by these iron porphyrin complexes with different axial ligands, help elucidate the varying push effects of the different axial ligands on oxygen activation by ferrous porphyrin. The spectroscopic and kinetic data help to develop a quantitative understanding of the "push effect" and, in particular, the electrostatic and covalent contributions to it.

O2 Reduction Reaction by Biologically Relevant Anionic Ligand Bound Iron Porphyrin Complexes

2013 ◽  
Vol 52 (22) ◽  
pp. 12963-12971 ◽  
Author(s):  
Subhra Samanta ◽  
Pradip Kumar Das ◽  
Sudipta Chatterjee ◽  
Kushal Sengupta ◽  
Biswajit Mondal ◽  
...  
Keyword(s):  
Reduction Reaction ◽  
Iron Porphyrin ◽  
Biologically Relevant ◽  
Anionic Ligand ◽  
O2 Reduction ◽  
Iron Porphyrin Complexes

Mechanism of Electrochemical Oxygen Reduction Reaction at Two-Dimensional Pt-doped MoSe2 Material: An Efficient Electrocatalyst

2021 ◽  
Author(s):  
Shrish Nath Upadhyay ◽  
Srimanta Pakhira
Keyword(s):  
Fuel Cells ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Clean Energy ◽  
Reduction Reaction ◽  
Electrochemical Reactions ◽  
Two Dimensional ◽  
O2 Reduction ◽  
Energy Conversion Systems ◽  
Electrochemical Oxygen

The O2 reduction reaction (ORR) is one promising reaction in clean energy conversion systems such as fuel cells, metal-air batteries, electrochemical reactions, etc. Pt shows excellent electrocatalytic activities for ORR,...

An insight into the electrochemical performance of La0.5−xPrxBa0.5CoO3−δ as cathodes for solid oxide fuel cells: study of the O2-reduction reaction

2018 ◽  
Vol 6 (34) ◽  
pp. 16699-16709 ◽  
Author(s):  
D. Garcés ◽  
H. Wang ◽  
S. A. Barnett ◽  
A. G. Leyva ◽  
F. R. Napolitano ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Solid Oxide Fuel Cells ◽  
Polarization Resistance ◽  
Reduction Reaction ◽  
Solid Oxide ◽  
Electrode Polarization ◽  
Oxide Fuel ◽  
Resistance Response ◽  
O2 Reduction ◽  
Insight Into

The mechanism controlling the electrode polarization resistance response was studied for new LT-SOFC cathodes with La0.5−xPrxBa0.5CoO3−δ (0 ≤ x ≤ 0.5) compositions.

scholarly journals Combining scaling relationships overcomes rate versus overpotential trade-offs in O2 molecular electrocatalysis

2020 ◽  
Vol 6 (11) ◽  
pp. eaaz3318 ◽  
Author(s):  
Daniel J. Martin ◽  
Brandon Q. Mercado ◽  
James M. Mayer
Keyword(s):  
Energy Efficiency ◽  
Reaction Rate ◽  
Electrical Energy ◽  
Reduction Reaction ◽  
Iron Porphyrin ◽  
Scaling Relationships ◽  
Anionic Ligand ◽  
Trade Offs ◽  
Rate Versus ◽  
Molecular Catalysts

The development of advanced chemical-to-electrical energy conversions requires fast and efficient electrocatalysis of multielectron/multiproton reactions, such as the oxygen reduction reaction (ORR). Using molecular catalysts, correlations between the reaction rate and energy efficiency have recently been identified. Improved catalysis requires circumventing the rate versus overpotential trade-offs implied by such “scaling relationships.” Described here is an ORR system—using a soluble iron porphyrin and weak acids—with the best reported combination of rate and efficiency for a soluble ORR catalyst. This advance is achieved not by “breaking” scaling relationships but rather by combining two of them. Key to this behavior is a polycationic ligand, which enhances anionic ligand binding and changes the catalyst E1/2. These results show how combining scaling relationships is a powerful way toward improved electrocatalysis.

A yolk–shell structured metal–organic framework with encapsulated iron-porphyrin and its derived bimetallic nitrogen-doped porous carbon for an efficient oxygen reduction reaction

2020 ◽  
Vol 8 (19) ◽  
pp. 9536-9544 ◽  
Author(s):  
Chaochao Zhang ◽  
Hao Yang ◽  
Dan Zhong ◽  
Yang Xu ◽  
Yanzhi Wang ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Porous Carbon ◽  
Metal Organic Framework ◽  
Reduction Reaction ◽  
Iron Porphyrin ◽  
Zeolitic Imidazolate Framework ◽  
Nitrogen Doped ◽  
Metal Organic ◽  
Organic Framework

A yolk–shell structured metal–organic framework (MOF) with encapsulated 5,10,15,20-tetraphenylporphyrinatoiron (FeTPP) in a zeolitic imidazolate framework (ZIF)-L-ZIF-8 is reported.

A facile Pt catalyst regeneration process significantly improves the catalytic activity of Pt–organic composites for the O2 reduction reaction

2015 ◽  
Vol 51 (60) ◽  
pp. 12052-12055 ◽  
Author(s):  
Jing-Fang Huang ◽  
Wen-Yu Chen
Keyword(s):  
Catalytic Activity ◽  
Size Effect ◽  
Catalytic Performance ◽  
Reduction Reaction ◽  
Pt Catalyst ◽  
O2 Reduction ◽  
Organic Composites ◽  
Acidic Conditions ◽  
Nano Size ◽  
Complexation Ability

Combination of the “nano-size” effect and Cl− complexation ability causes massive electrodissolution of Pt under acidic conditions to promote the regeneration of Pt–organic composites and to significantly improve the catalytic performance of the O2 reduction reaction.

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