scholarly journals Mediated Electron Transfer at Redox Active Monolayers. Part 3: Bimolecular Outer-Sphere, First Order Koutecky-Levich and Adduct Formation Mechanisms

Sensors ◽  
2002 ◽  
Vol 2 (12) ◽  
pp. 473-506 ◽  
Author(s):  
Michael Lyons
Keyword(s):  
Electron Transfer ◽  
Outer Sphere ◽  
Adduct Formation ◽  
Formation Mechanisms ◽  
First Order ◽  
Redox Active ◽  
Mediated Electron Transfer

scholarly journals Redox-Active Glyconanoparticles as Electron Shuttles for Mediated Electron Transfer with Bilirubin Oxidase in Solution

2017 ◽  
Vol 139 (45) ◽  
pp. 16076-16079 ◽  
Author(s):  
Andrew J. Gross ◽  
Xiaohong Chen ◽  
Fabien Giroud ◽  
Christophe Travelet ◽  
Redouane Borsali ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Bilirubin Oxidase ◽  
Electron Shuttles ◽  
Redox Active ◽  
Mediated Electron Transfer

scholarly journals Mediated Electron Transfer at Redox Active Monolayers

Sensors ◽  
2001 ◽  
Vol 1 (7) ◽  
pp. 215-228 ◽  
Author(s):  
Michael Lyons
Keyword(s):  
Electron Transfer ◽  
Redox Active ◽  
Mediated Electron Transfer

scholarly journals Electricity from lignocellulosic substrates by thermophilic Geobacillus species

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Namita Shrestha ◽  
Abhilash Kumar Tripathi ◽  
Tanvi Govil ◽  
Rajesh Kumar Sani ◽  
Meltem Urgun-Demirtas ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Cyclic Voltammetry ◽  
Lignocellulosic Biomass ◽  
Microbial Fuel Cells ◽  
Nadh Dehydrogenase ◽  
Type Ii ◽  
Lignocellulosic Substrates ◽  
Redox Active ◽  
Mediated Electron Transfer ◽  
Exogenous Enzymes

Abstract Given our vast lignocellulosic biomass reserves and the difficulty in bioprocessing them without expensive pretreatment and fuel separation steps, the conversion of lignocellulosic biomass directly into electricity would be beneficial. Here we report the previously unexplored capabilities of thermophilic Geobacillus sp. strain WSUCF1 to generate electricity directly from such complex substrates in microbial fuel cells. This process obviates the need for exogenous enzymes and redox mediator supplements. Cyclic voltammetry and chromatography studies revealed the electrochemical signatures of riboflavin molecules that reflect mediated electron transfer capabilities of strain WSUCF1. Proteomics and genomics analysis corroborated that WSUCF1 biofilms uses type-II NADH dehydrogenase and demethylmenaquinone methyltransferase to transfer the electrons to conducting anode via the redox active pheromone lipoproteins localized at the cell membrane.

scholarly journals Electron transfer reaction of Tris(1,10-phenanthroline) cobalt(III) complex [Co(phen)3]3+ and thiosulphate ion (S2O32−) in an aqueous acidic medium

2018 ◽  
Vol 6 (1) ◽  
pp. 121 ◽  
Author(s):  
C R. Osunkwo ◽  
I U. Nkole ◽  
A D. Onu ◽  
S O. Idris
Keyword(s):  
Electron Transfer ◽  
Acidic Medium ◽  
Transfer Reaction ◽  
Outer Sphere ◽  
Reaction Rates ◽  
Electron Transfer Reaction ◽  
Ion Concentration ◽  
Hydrogen Ion Concentration ◽  
First Order ◽  
Aqueous Acidic Medium

The electron transfer reaction of Tris (1,10-phenanthroline)cobalt(III) complex by thiosulphate ion has been studied in an aqueous acidic medium. Stoichiometric determination shows that for one mole of the oxidant that was reduced, one mole of the reductant was consumed; the reaction conforms to an overall equation: 2[Co(phen)3]3+ + 2S2O32− → 2[Co(phen)3]2+ + S4O62− Kinetics study carried out under pseudo-first order condition shows that the reaction proceeded via a one-way acid-dependent pathway and was third order overall; zero order with respect to the oxidant concentration, second order with respect to the reductant concentration and first order with respect to the hydrogen ion concentration. The empirical rate law conforms to the equation: −   {Co(phen)3}3+] = a [H+] [S2O32−]2 ‘a’ = 128.26 dm6 mol−2 s−1: at [H+] = 2.0 × 10−2 mol dm−3, µ = 0.4 mol dm−3 (NaCl), T = 28 ± 1˚C and λmax = 495 nm.The rate of reaction increased at the increase in ionic strength and at the decrease in medium dielectric constant. Added cations and anions catalyzed and inhibited the reaction rates respectively. The Michaelis-Menten plot of 1/k1 versus 1/[S2O32−]2 started from the origin. Hence based on spectroscopic investigation, thermodynamic information from temperature dependence studies and kinetic evidence from Michaelis–Menten plots and the interactions with added ions, an outer-sphere mechanism has been rationalized for this reaction. The mechanistic scheme of the reaction was proposed via the stated mechanistic route.   

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