OPTIMIZATION OF REDOX MEDIATORS AND ELECTROLYTES

2010 ◽  
pp. 137-164
Keyword(s):  
Redox Mediators

An NADH-Inspired Redox Mediator Strategy to Promote Second-Sphere Electron and Proton Transfer for Cooperative Electrochemical CO2 Reduction Catalyzed by Iron Porphyrin

2020 ◽  
Author(s):  
Peter T. Smith ◽  
Sophia Weng ◽  
Christopher Chang
Keyword(s):  
Proton Transfer ◽  
Co2 Reduction ◽  
Iron Porphyrin ◽  
Redox Mediators ◽  
Reservoir Properties ◽  
Proton Reduction ◽  
Electrochemical Co2 Reduction ◽  
Starting Point ◽  
Rate Improvement ◽  
Molecular Catalysts

We present a bioinspired strategy for enhancing electrochemical carbon dioxide reduction catalysis by cooperative use of base-metal molecular catalysts with intermolecular second-sphere redox mediators that facilitate both electron and proton transfer. Functional synthetic mimics of the biological redox cofactor NADH, which are electrochemically stable and are capable of mediating both electron and proton transfer, can enhance the activity of an iron porphyrin catalyst for electrochemical reduction of CO<sub>2</sub> to CO, achieving a 13-fold rate improvement without altering the intrinsic high selectivity of this catalyst platform for CO<sub>2</sub> versus proton reduction. Evaluation of a systematic series of NADH analogs and redox-inactive control additives with varying proton and electron reservoir properties reveals that both electron and proton transfer contribute to the observed catalytic enhancements. This work establishes that second-sphere dual control of electron and proton inventories is a viable design strategy for developing more effective electrocatalysts for CO<sub>2</sub> reduction, providing a starting point for broader applications of this approach to other multi-electron, multi-proton transformations.

scholarly journals Influence of the phase state of self-assembling redox mediators on their electrochemical activity

AIChE Journal ◽  
2014 ◽  
Vol 60 (4) ◽  
pp. 1381-1392 ◽  
Author(s):  
John P. E. Muller ◽  
Burcu S. Aytar ◽  
Yukishige Kondo ◽  
David M. Lynn ◽  
Nicholas L. Abbott
Keyword(s):  
Phase State ◽  
Electrochemical Activity ◽  
Redox Mediators ◽  
Self Assembling

scholarly journals Laccases: Versatile Biocatalysts for the Synthesis of Heterocyclic Cores

Molecules ◽  
2021 ◽  
Vol 26 (12) ◽  
pp. 3719
Author(s):  
Ana Catarina Sousa ◽  
Lígia O. Martins ◽  
M. Paula Robalo
Keyword(s):  
Membered Ring ◽  
Low Molecular Weight ◽  
Redox Potentials ◽  
Redox Mediators ◽  
Multicopper Oxidases ◽  
Phenothiazine Derivatives ◽  
Ph Values ◽  
Electron Shuttles ◽  
Specific Oxidation ◽  
Optimal Ph

Laccases are multicopper oxidases that have shown a great potential in various biotechnological and green chemistry processes mainly due to their high relative non-specific oxidation of phenols, arylamines and some inorganic metals, and their high redox potentials that can span from 500 to 800 mV vs. SHE. Other advantages of laccases include the use of readily available oxygen as a second substrate, the formation of water as a side-product and no requirement for cofactors. Importantly, addition of low-molecular-weight redox mediators that act as electron shuttles, promoting the oxidation of complex bulky substrates and/or of higher redox potential than the enzymes themselves, can further expand their substrate scope, in the so-called laccase-mediated systems (LMS). Laccase bioprocesses can be designed for efficiency at both acidic and basic conditions since it is known that fungal and bacterial laccases exhibit distinct optimal pH values for the similar phenolic and aromatic amines. This review covers studies on the synthesis of five- and six-membered ring heterocyclic cores, such as benzimidazoles, benzofurans, benzothiazoles, quinazoline and quinazolinone, phenazine, phenoxazine, phenoxazinone and phenothiazine derivatives. The enzymes used and the reaction protocols are briefly outlined, and the mechanistic pathways described.

scholarly journals High-Rate Long Cycle-Life Li-Air Battery Aided by Bifunctional InX3 (X = I and Br) Redox Mediators

2021 ◽  
Vol 13 (4) ◽  
pp. 4915-4922
Author(s):  
Sina Rastegar ◽  
Zahra Hemmat ◽  
Chengji Zhang ◽  
Samuel Plunkett ◽  
Jianguo Wen ◽  
...  
Keyword(s):  
Cycle Life ◽  
High Rate ◽  
Redox Mediators ◽  
Long Cycle ◽  
Long Cycle Life ◽  
Air Battery

Enhanced Transformation of Emerging Contaminants by Permanganate in the Presence of Redox Mediators

2019 ◽  
Vol 54 (3) ◽  
pp. 1909-1919 ◽  
Author(s):  
Zhenyu Shi ◽  
Can Jin ◽  
Ruopeng Bai ◽  
Zhanqi Gao ◽  
Jing Zhang ◽  
...  
Keyword(s):  
Emerging Contaminants ◽  
Redox Mediators

scholarly journals Facilitating charge reactions in Al‐S batteries with redox mediators

ChemSusChem ◽  
2021 ◽  
Author(s):  
He Li ◽  
John Lampkin ◽  
Nuria Garcia-Araez
Keyword(s):  
Redox Mediators

scholarly journals Aflatoxin B1 and M1 Degradation by Lac2 from Pleurotus pulmonarius and Redox Mediators

Toxins ◽  
2016 ◽  
Vol 8 (9) ◽  
pp. 245 ◽  
Author(s):  
Martina Loi ◽  
Francesca Fanelli ◽  
Paolo Zucca ◽  
Vania Liuzzi ◽  
Laura Quintieri ◽  
...  
Keyword(s):  
Aflatoxin B1 ◽  
Redox Mediators ◽  
Pleurotus Pulmonarius

scholarly journals Intriguing C–H⋯Cu interactions in bis-(phenanthroline)Cu(i) redox mediators for dye-sensitized solar cells

2018 ◽  
Vol 47 (4) ◽  
pp. 1018-1022 ◽  
Author(s):  
Alessia Colombo ◽  
Rachele Ossola ◽  
Mirko Magni ◽  
Dominique Roberto ◽  
Denis Jacquemin ◽  
...  
Keyword(s):  
Solar Cells ◽  
Dye Sensitized Solar Cells ◽  
Redox Mediators ◽  
Methyl Group ◽  
Dye Sensitized ◽  
Copper Site ◽  
First Time ◽  
Sensitized Solar Cells

For the first time, an anagostic interaction is found between a H atom of a methyl group and a copper site in the bis-2-tertbutyl(phenanthroline)Cu(i) complex.

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