Increased electron transfer kinetics and thermally treated graphite stability through improved tunneling paths

Nwamba, O. Charles; Echeverría, Elena; Yu, Qingbo; Raja, Krishnan S.; McIlroy, David N.; Shreeve, Jean’ne M.; Aston, D. Eric

doi:10.1007/s10853-020-04846-6

Cited by 3 publications

(4 citation statements)

References 88 publications

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“…Our rate constant value is in the same general range as values reported previously. 32,33 The differing electrocatalytic properties of graphite electrodes due to oxygenation 34 and edge effects 35 result in a wide range of rate constant values. Therefore, consistent preparation and treatment of graphite electrodes is crucial in obtaining reproducible kinetics parameters.…”

Section: [ ] =mentioning

confidence: 99%

Methods—Design Guidelines for Tubular Flow-through Electrodes for Use in Electroanalytical Studies of Redox Reaction Kinetics

Gong

Clemens

Davis

et al. 2021

J. Electrochem. Soc.

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The tubular flow-through electrode (FTE) is a facile electroanalytical tool for investigating electrochemical reaction kinetics; however, its suitability for this purpose requires careful design and operation under conditions that guarantee uniform current distribution. In this perspective article, we provide a scaling analysis of the transport and reaction processes within a tubular FTE leading to quantitative guidelines for the FTE design and operation. Two dimensionless parameters (classical Wagner number WaI and modified Wagner number incorporating the effect of mass transport WaII) are utilized to compare the magnitudes of the ohmic, activation and transport resistances of the tubular FTE, and to quantify its current distribution uniformity. With the aid of analytical modeling of the current distribution, optimal ranges for these two dimensionless parameters are defined so as to ascertain uniform current distribution. Application of these guidelines to a graphite tubular FTE is shown to enable the precise determination of the charge-transfer kinetics of the ferri/ferrocyanide redox reaction.

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Section: [ ] =mentioning

confidence: 99%

Methods—Design Guidelines for Tubular Flow-through Electrodes for Use in Electroanalytical Studies of Redox Reaction Kinetics

Gong

Clemens

Davis

et al. 2021

J. Electrochem. Soc.

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“…Unsupported nickel nanoparticle catalyst may suffer from poor electrical conductivity due to nickel oxide formation and/or nanoparticle agglomeration 13 . Supporting nickel on high surface area carbon can enhance the catalytic performance through faster electron transfer kinetics, availability of a high number of active sites and improved electrical conductivity 14 …”

Section: Introductionmentioning

confidence: 99%

“…13 Supporting nickel on high surface area carbon can enhance the catalytic performance through faster electron transfer kinetics, availability of a high number of active sites and improved electrical conductivity. 14 Ni-based mono-and bimetallic (NiBi, NiB, NiCu, NiFe, NiCo, NiPd, NiAu, NiCoO 2 ) electrocatalysts have been investigated in the three-electrode electrochemical cell, [15][16][17][18][19][20][21][22][23] while device tests in an electrolyser are less frequently investigated. 15,[21][22][23] Bimetallic catalysts have improved catalytic activity compared to monometallic Ni.…”

Section: Introductionmentioning

confidence: 99%

Electrolysis of glycerol to value‐added chemicals in alkaline media

Shubair

Houache

et al. 2022

J of Chemical Tech & Biotech

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BACKGROUND Glycerol, a by‐product of biodiesel production, is produced in large quantities, exceeding its demand. The saturation of glycerol resulted in a sharp reduction in its market value and the surplus waste may pose a risk to the environment. By means of electrochemical technologies, glycerol could be oxidized into value‐added products such as glycerate, tartronate and lactate. In the present work, carbon‐supported NiBi catalysts with different atomic ratios (NixBi1−x/C, wherex = 100, 95, 90 and 50 at%) were fabricated and utilized in a 25 cm2 electrolysis cell. RESULTS The as‐fabricated catalysts were characterized and analyzed by various physicochemical and electrochemical characterizations. Using a three‐electrode electrochemical cell, Ni95Bi5/C showed the highest current density of 104 mA cm−2, with an onset potential of 1.32 V versus a reversible hydrogen electrode. Long‐term chronoamperometry was performed in a glycerol electrolysis cell accompanied by the product analysis using high‐performance liquid chromatography. It was found that Ni95Bi5/C had higher selectivity to glycerate C3 product compared to Ni/C. Additionally, optimizing experimental conditions (applied potential, residence time and temperature) to achieve higher selectivity to C3 products was thoroughly studied. The selectivity to C3 value‐added products was enhanced by adjusting the operating conditions. CONCLUSION Small addition of bismuth to Ni/C enhanced both catalytic activity and selectivity to C3 products. The main products formed on NixBi1−x/C were formate and glycerate, while the secondary products were glycolate, tartronate, oxalate and lactate. By running electrolysis under optimal conditions, the selectivity to C3 products was significantly enhanced. © 2022 Society of Chemical Industry (SCI).

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“…Nowadays, a typical sensing protocol utilizes pulse-voltammetric or amperometric techniques, combined with advanced, surface-modified working electrodes and/or enrichment of the electrode interface with the analyte of interest, especially in trace analysis. Efforts to improve analytical performance are predominantly focused on enhancing the properties of the sensing electrodes, 4,5 although only a small fraction of reports deal with new ideas regarding accumulation procedures 6,7 or advances in potential alteration programs. 2,[8][9][10] Square-wave voltammetry (SWV) is considered the second generation of pulse techniques, [11][12][13] providing high sensitivity and rapid measurement.…”

mentioning

confidence: 99%

Analytical Aspects of Novel Techniques Derived from Square-Wave Voltammetry

Guziejewski

Smarzewska

Mirčeski

2023

J. Electrochem. Soc.

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Recently introduced novel voltammetric and chronoamperometric techniques, derived from square-wave voltammetry (SWV), are being studied for their analytical utility. Three voltammetric protocols, namely potential-corrected, multi-sampled, and cumulative square-wave voltammetry, along with square-wave chronoamperometry (also known as electrochemical Faradaic spectroscopy), are described and analytically tested. The evaluation is based on both theoretical and empirical approaches, including statistical evaluation and comparison with standard electrochemical techniques such as differential pulse, conventional SWV, and conventional chronoamperometry. The novel techniques exhibit improved analytical performance compared to standard electrochemical measurements, providing a basis for advanced analysis and analytical applications.

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Increased electron transfer kinetics and thermally treated graphite stability through improved tunneling paths

Cited by 3 publications

References 88 publications

Methods—Design Guidelines for Tubular Flow-through Electrodes for Use in Electroanalytical Studies of Redox Reaction Kinetics

Methods—Design Guidelines for Tubular Flow-through Electrodes for Use in Electroanalytical Studies of Redox Reaction Kinetics

Electrolysis of glycerol to value‐added chemicals in alkaline media

Analytical Aspects of Novel Techniques Derived from Square-Wave Voltammetry

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