A cross examination of electron transfer rate constants for carbon screen-printed electrodes using Electrochemical Impedance Spectroscopy and cyclic voltammetry

Randviir, Edward P.

doi:10.1016/j.electacta.2018.08.021

Cited by 226 publications

(141 citation statements)

References 30 publications

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“…Clearly, the presence of rGO in the composite reduced the charge transfer resistance between the counter electrode and the electrolyte solution [7]. The electrochemical rate constant k o (cm·s -1 ) values for the I − /I 3 − couple on the cathodes can be calculated from charge transfer resistance R CE using equation R CE = RT/ðn 2 F 2 AC k o Þ [34,35]. Using this equation, the ratio of k o between two cathodes (I and II) can be calculated via the ratio of…”

Section: Dssc Performancesmentioning

confidence: 99%

Fabrication and Electrochemical Behavior Investigation of a Pt-Loaded Reduced Graphene Oxide Composite (Pt@rGO) as a High-Performance Cathode for Dye-Sensitized Solar Cells

Nguyen

et al. 2020

International Journal of Photoenergy

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A platinum-reduced graphene oxide thin film composite (Pt@rGO, 100 nm) was prepared on a fluorine-doped tin oxide- (FTO-) coated glass substrate by a screen printing method using a Pt@rGO screen printing paste (0.12% Pt; Pt/rGO=1.5 w/w). The as-prepared electrode (denoted as Pt@rGO/FTO) was used as the cathode for the assembly of dye-sensitized solar cells (DSSCs). It showed a well-dispersed and high loading of Pt on rGO surface with a particle size distributed around 10 nm. The redox behavior of ferrocene was performed at Pt/FTO, Pt@rGO/FTO, and rGO/FTO electrodes by a cyclic voltammetry (CV) method. The kinetic parameters, in particular, the standard reduction potential (E0, V), the transfer coefficient (α), the heterogeneous rate constant (k0, cm·s-1), and the diffusion coefficient (D, cm2 s-1), were determined by CV data treatment using convolution-deconvolution and fitting methods. The values of E0, α, k0, and D at Pt@rGO/FTO electrode were, respectively, 326 mV, 0.471, 3.33 cm·s-1, and 4.19 cm2·s-1, equivalent to those of Pt/FTO electrode (340 mV, 0.474, 3.18 cm·s-1, and 4.19 cm2·s-1). The Pt@rGO/FTO electrode exhibited excellent electrocatalytic activity compared to that of Pt thin film (Pt/FTO electrode) prepared from Pt commercial paste. The heterogeneous electron transfer rate constant k0 (cm·s-1) for I3-/I- at Pt@rGO/FTO is 1.3 times faster than that at Pt/FTO. The energy conversion efficiency of the DSSCs assembled from Pt@rGO-DSSC cathode reached 7.0%, an increase of 20.7% over the commercial Pt-based cathode (Pt-DSSC, 5.8%). The rGO component in the Pt@rGO composite plays two important roles: (i) facilitating the electron transfer between Pt NPs catalyst and the FTO substrate via the bandgap effect and (ii) the enlargement catalytic surface area of Pt NPs via the loading effect. The rGO material has, therefore, potential to replace the Pt content and improve the performance of the DSSC device.

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Section: Dssc Performancesmentioning

confidence: 99%

Fabrication and Electrochemical Behavior Investigation of a Pt-Loaded Reduced Graphene Oxide Composite (Pt@rGO) as a High-Performance Cathode for Dye-Sensitized Solar Cells

Nguyen

et al. 2020

International Journal of Photoenergy

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“…+ 416 mV vs the Standard Hydrogen Electrode at pH 7 [25], while the E 0′ for c-type cytochromes is reported at ca. − 200 to 300 mV [26]), as well as for its high electron transfer kinetics at graphite electrodes [27]. We then characterised the bioelectrochemical membrane reactor (BEMR) system in terms of current output and community dynamics and compared the performance with a Control-BES where neither the HFMs nor the mediator was used.…”

Section: Introductionmentioning

confidence: 99%

Enhancing methane oxidation in a bioelectrochemical membrane reactor using a soluble electron mediator

Zhang

Rabiee

Frank

et al. 2020

Biotechnol Biofuels

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Background Bioelectrochemical methane oxidation catalysed by anaerobic methanotrophic archaea (ANME) is constrained by limited methane bioavailability as well as by slow kinetics of extracellular electron transfer (EET) of ANME. In this study, we tested a combination of two strategies to improve the performance of methane-driven bioelectrochemical systems that includes (1) the use of hollow fibre membranes (HFMs) for efficient methane delivery to the ANME organisms and (2) the amendment of ferricyanide, an effective soluble redox mediator, to the liquid medium to enable electrochemical bridging between the ANME organisms and the anode, as well as to promote EET kinetics of ANME. Results The combined use of HFMs and the soluble mediator increased the performance of ANME-based bioelectrochemical methane oxidation, enabling the delivery of up to 196 mA m−2, thereby outperforming the control system by 244 times when HFMs were pressurized at 1.6 bar. Conclusions Improving methane delivery and EET are critical to enhance the performance of bioelectrochemical methane oxidation. This work demonstrates that by process engineering optimization, energy recovery from methane through its direct oxidation at relevant rates is feasible.

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“…where F = Faraday's constant (96,485 C/mol); A = electrode area (0.07 cm 2 ); T = Temperature (298K); n = number of electrons = 1; C = concentration (5 mM); ϑ = scan rate (0.1 V/s); α = transfer coefficient; Rct = Charge transfer resistance from Nyquist plot. The K 0 value obtained from EIS ( Figure 5(a) red curve) is significantly lower than that from CV (blue curve) because of the electrochemical irreversibility at the electrode-electrolyte interface [16]. The increase in Faradaic impedance after Glu binding shows an almost linear trend in Figure 5(b).…”

Section: Resultsmentioning

confidence: 92%

Non-Enzymatic Electrochemical Detection Of Glutamate Using Templated Polymer-Based Target Receptors

Ahmad

Dutta

et al. 2019

2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems &Amp; Eurosensors XXXIII (TRANSDUCERS &Am

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We present a novel electrochemical biosensing platform for the detection of neurotransmitter glutamate using templated polymer-based target receptors. Our sensing approach demonstrates, for the first time, a non-enzymatic approach without the need of glutamate oxidase, leading to a more specific and rapid response. The proposed detection principle is based on the following two claims: (1) our templated polymer-based receptor results in specific molecular recognition of the target glutamate and, (2) upon target binding, the polymer undergoes a conformation change which can then be measured via electrochemical techniques. This sensing platform has the potential to provide direct monitoring of a variety of non-electroactive species and to eliminate the incorporation of enzymes thereby providing a simpler and more robust alternative to enzymebased sensors.

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A cross examination of electron transfer rate constants for carbon screen-printed electrodes using Electrochemical Impedance Spectroscopy and cyclic voltammetry

Cited by 226 publications

References 30 publications

Fabrication and Electrochemical Behavior Investigation of a Pt-Loaded Reduced Graphene Oxide Composite (Pt@rGO) as a High-Performance Cathode for Dye-Sensitized Solar Cells

Fabrication and Electrochemical Behavior Investigation of a Pt-Loaded Reduced Graphene Oxide Composite (Pt@rGO) as a High-Performance Cathode for Dye-Sensitized Solar Cells

Enhancing methane oxidation in a bioelectrochemical membrane reactor using a soluble electron mediator

Non-Enzymatic Electrochemical Detection Of Glutamate Using Templated Polymer-Based Target Receptors

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