Numerically optimized shape of directly heated electrodes for minimal temperature gradients

Mahnke, Nico; Marković, Aleksandar; Duwensee, Heiko; Wachholz, Falko; Flechsig, Gerd‐Uwe; Rienen, Ursula van

doi:10.1016/j.snb.2008.11.034

Cited by 6 publications

(4 citation statements)

References 31 publications

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“…The mass transport was solved by similarity theory using the similarity numbers, but it does not consider thermodiffusion [ 14 ]. Temperature field digital simulations around the wire heated electrodes are presented in another study [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Voltammetry under a Controlled Temperature Gradient

Sajdlová

Krejčí

Marvanek

2010

Sensors

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Electrochemical measurements are generally done under isothermal conditions. Here we report on the application of a controlled temperature gradient between the working electrode surface and the solution. Using electrochemical sensors prepared on ceramic materials with extremely high specific heat conductivity, the temperature gradient between the electrode and solution was applied here as a second driving force. This application of the Soret phenomenon increases the mass transfer in the Nernst layer and enables more accurate control of the electrode response enhancement by a combination of diffusion and thermal diffusion. We have thus studied the effect of Soret phenomenon by cyclic voltammetry measurements in ferro/ferricyanide. The time dependence of sensor response disappears when applying the Soret phenomenon, and the complicated shape of the cyclic voltammogram is replaced by a simple exponential curve. We have derived the Cotrell-Soret equation describing the steady-state response with an applied temperature difference.

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Section: Introductionmentioning

confidence: 99%

Voltammetry under a Controlled Temperature Gradient

Sajdlová

Krejčí

Marvanek

2010

Sensors

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“…However, successful 'general engineering' modelling is often difficult when working with new theoretical phenomena, rather than theoretically established experimental conditions, or even novel experiments for which there is no prior theory. Nevertheless, as highlighted in recent literature, under appropriate model conditions, the software will follow trends for optimisation of known methods [23,24]. As such, it may provide a quicker route to those answers due to the attractive and simple user interface, as well as circumnavigating in-house software development.…”

Section: Discussionmentioning

confidence: 99%

“…By far the most common use is for optimisation of physical methods -for example, Mahnke et al [23] have utilised simulations in 3D to optimise the shape of directly heated electrodes for minimal temperature gradients; however, no direct comparison to experiment was made. Cheng coupled electrochemistry, fluid mechanics, steric stabilisation and heat transfer into a computational fluid dynamics model, again with no direct comparison to experiment, leading to a suggested optimised route of deposition [24].…”

Section: Previous Literaturementioning

confidence: 99%

Analysis of commercial general engineering finite element software in electrochemical simulations

Cutress

Dickinson

Compton

2010

Journal of Electroanalytical Chemistry

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“…Baranski and Boika have studied the mass transfer and heat transfer for high-frequency AC heated microelectrode solutions through theoretical calculations and numerical simulations (COMSOL). ,,, Jenkins’s group invented a screen printed disposable electrode system with an underlying thermocouple using a single universal calibration . The influence of temperature on the kinetics of DNA strand displacement was studied by Flechsig’s group. , In addition, many other works have been done for temperature calculations, calibrations and simulations of heated electrodes. ,− …”

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confidence: 99%

Temperature-Controllable Electrodes with a One-Parameter Calibration

Yang

Chen

et al. 2019

ACS Sens.

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Electrically heated electrodes have been applied for various chemical and biological sensors. However, previous electrically heated electrodes, including microwires and microdiscs, are usually small and often suffer from the requirement of frequent calibrations of the electrode surface temperature (T s ) at different environment temperatures. Here, we fabricate a temperature-controllable disk electrode (TCDE) with a conventional size (3−5 mm in diameter). A one-parameter temperature calibration is proposed using a temperature transfer coefficient α and a structural model (T s = T e + α (T h − T e )) to estimate T s (T h and T e are the temperature of the heating element and environment, respectively). The value of α is unique for a TCDE and mainly dependent on the structure and materials of the electrodes and the solution in nature. Once α is experimentally determined, T s can be calibrated and found to be applicable to wide fluctuations in room temperature (15.0−33.0 °C) with errors below 1.5% for three types of disk electrodes (gold, glassy carbon, and platinum). The required T s can be obtained by just setting T h without thermal characterization between the heating power and T s . A simple relationship for exploring the dependence of α on the height (H) and radius (R) of the electrode materials and other constants (a, b, c, and R 0 ), α = 1 − c − aH − b (R − R 0 ) 2 , is revealed by numerical simulations (COMSOL). The impact of the radii of both the insulating materials of the electrode and the electrochemical cells on T s is also considered. The effect of the solution thermal conductivity on α is studied. TCDEs are expected to be used as a sensor platform with enhanced performance.

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Numerically optimized shape of directly heated electrodes for minimal temperature gradients

Cited by 6 publications

References 31 publications

Voltammetry under a Controlled Temperature Gradient

Voltammetry under a Controlled Temperature Gradient

Analysis of commercial general engineering finite element software in electrochemical simulations

Temperature-Controllable Electrodes with a One-Parameter Calibration

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