Electrochemical Conversion of CO2 to C2 Oxygenates on Pb(II)-Salen Catalysts-Coated Graphite Electrodes: Role of Salen Ligand and Appended Ligand-Substituents to the Production

2021 ◽  
pp. 134092
Author(s):  
Paulomi Bose ◽  
Chandan Mukherjee ◽  
Animes Kumar Golder
Keyword(s):  
Graphite Electrodes ◽  
Electrochemical Conversion ◽  
Salen Ligand

scholarly journals Metallic Nanoparticles Obtained via “Green” Synthesis as a Platform for Biosensor Construction

2019 ◽  
Vol 9 (4) ◽  
pp. 720 ◽  
Author(s):  
Galina Gayda ◽  
Olha Demkiv ◽  
Nataliya Stasyuk ◽  
Roman Serkiz ◽  
Maksym Lootsik ◽  
...  
Keyword(s):  
Green Synthesis ◽  
Metallic Nanoparticles ◽  
Alcohol Oxidase ◽  
Inorganic Ions ◽  
Special Role ◽  
Graphite Electrodes ◽  
Fluorescent Markers ◽  
Extracellular Metabolites ◽  
Very High

Novel nanomaterials, including metallic nanoparticles obtained via green synthesis (gNPs), have a great potential for application in biotechnology, industry and medicine. The special role of gNPs is related to antibacterial agents, fluorescent markers and carriers for drug delivery. However, application of gNPs for construction of amperometric biosensors (ABSs) is not well documented. The aim of the current research was to study potential advantages of using gNPs in biosensorics. The extracellular metabolites of the yeast Ogataea polymorpha were used as reducing agents for obtaining gNPs from the corresponding inorganic ions. Several gNPs were synthesized, characterized and tested as enzyme carriers on the surface of graphite electrodes (GEs). The most effective were Pd-based gNPs (gPdNPs), and these were studied further and applied for construction of laccase- and alcohol oxidase (AO)-based ABSs. AO/GE, AO-gPdNPs/GE, laccase/GE and laccase-gPdNPs/GE were obtained, and their analytical characteristics were studied. Both gPdNPs-modified ABSs were found to have broader linear ranges and higher storage stabilities than control electrodes, although they are less sensitive toward corresponding substrates. We thus conclude that gPdNPs may be promising for construction of ABSs for enzymes with very high affinities to their substrates.

scholarly journals Reactivity of nanocolloidal particles γ-Fe2O3 at charged interfaces : Part 2. Electrochemical conversion. Role of the electrode material

2008 ◽  
Vol 10 (22) ◽  
pp. 3274 ◽  
Author(s):  
I. T. Lucas ◽  
E. Dubois ◽  
J. Chevalet ◽  
S. Durand-Vidal ◽  
S. Joiret
Keyword(s):  
Electrode Material ◽  
Electrochemical Conversion

scholarly journals The Role of Oxygenic Groups and Sp3 Carbon Hybridization in Activated Graphite Electrodes for Vanadium Redox Flow Batteries

2021 ◽  
Author(s):  
Ali Hassan ◽  
Asnake Sahele Haile ◽  
Theodore Tzedakis ◽  
Heine Anton Hansen ◽  
Piotr de Silva
Keyword(s):  
Dft Calculations ◽  
Density Functional ◽  
Vanadium Redox Flow Battery ◽  
Carbon Surface ◽  
Graphite Electrodes ◽  
Functional Theory ◽  
Redox Flow Batteries ◽  
Flow Batteries ◽  
Vanadium Redox

<p>Graphite felt is a widely used electrode material for vanadium redox flow batteries. Electrode activation leads to the functionalization of the graphite surface with epoxy, OH, C=O, and COOH oxygenic groups and changes the carbon surface morphology and electronic</p> <p>structure; thus, improving the electrode’s electroactivity relative to the untreated graphite. In this study, we conduct density functional theory (DFT) calculations to evaluate functionalization’s</p> <p>role towards the positive half-cell reaction of the vanadium redox flow battery. The DFT calculations show that oxygenic groups improve the graphite felt’s affinity towards the VO<sup>2+</sup>/VO2<sup>+</sup> redox couple in the following order: C=O > COOH > OH > basal plane. Projected density of states (PDOS) calculations show that these groups increase the electrode’s sp<sup>3 </sup>hybridization in the same order. We conclude that the increase in the sp<sup>3</sup> hybridization is responsible for the improved electroactivity, while the oxygenic groups’ presence is responsible for this sp<sup>3</sup> increment. These insights can help in the better selection of activation processes and optimization of their parameters.</p>

scholarly journals Electrochemical conversion/combustion of a model organic pollutant on BDD anode: Role of sp 3 /sp 2 ratio

2014 ◽  
Vol 47 ◽  
pp. 37-40 ◽  
Author(s):  
Danyelle Medeiros de Araújo ◽  
Pablo Cañizares ◽  
Carlos A. Martínez-Huitle ◽  
Manuel Andrés Rodrigo
Keyword(s):  
Organic Pollutant ◽  
Bdd Anode ◽  
Electrochemical Conversion

Unravelling the Chemistry of Catalyst Surface and Solvent towards C-C Bond Formation through Activation and Electrochemical Conversion of CO2 into Hydrocarbons over Micro-structured Dendritic Copper

2021 ◽  
Author(s):  
Nusrat Rashid ◽  
Mohsin Ahmad Bhat ◽  
Pravin Ingole
Keyword(s):  
Catalyst Surface ◽  
Bond Formation ◽  
Organic Medium ◽  
Electrochemical Conversion

Herein, we report the results from our study towards understanding the role of electrocatalyst surfaces and solvent (aqueous versus wet organic medium) on C-C bond formation over microstructrured spheres, polygons,...

Synthesis, Structure, and Characterization of New Mononuclear Mn(II) Complexes. Electrochemical Conversion into New Oxo-Bridged Mn2(III,IV) Complexes. Role of Chloride Ions

2005 ◽  
Vol 44 (10) ◽  
pp. 3669-3683 ◽  
Author(s):  
Christelle Hureau ◽  
Geneviève Blondin ◽  
Marie-France Charlot ◽  
Christian Philouze ◽  
Martine Nierlich ◽  
...  
Keyword(s):  
Chloride Ions ◽  
Electrochemical Conversion

Role of Voltage Scan Rate on Degradation of Graphite Electrodes Electrochemically Cycled vs. Li/Li+

2012 ◽  
Vol 1388 ◽  
Author(s):  
Sandeep Bhattacharya ◽  
A. Reza Riahi ◽  
Ahmet T. Alpas
Keyword(s):  
Graphite Electrode ◽  
Surface Damage ◽  
Graphite Surface ◽  
Degradation Mechanisms ◽  
Peak Voltage ◽  
Cross Sectional ◽  
Graphite Electrodes ◽  
Scan Rate

ABSTRACTGraphite electrode surface degradation mechanisms and formation of solid electrolyte layers (SEI) at the interface with the electrolyte were studied as a function of the applied voltage and voltage scan rates using in situ optical microscopy. Voltammetry tests were initiated from a peak voltage of 3.00 V during which the voltage was decreased to a constant base potential (0.02 V) using different scan rates of 0.05-5.00 mV/s. Cross-sectional FIB microscopy indicated that graphite surface and subsurface damage -- in the form of loss of material from graphite -- was reduced when dense and continuous deposits of SEI formed at low scan rates (e.g. 0.05 mV/s).Whereas, non-uniform and discontinuous SEI formed at high scan rates (∼ 5.00 mV/s) was unable to alleviate graphite surface damage.

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