Modelling and numerical simulation of hydrodynamical processes in a confined rotating electrode configuration

Mandin, Philippe; Pauporté, Th.; Fanouillère, Ph.; Lincot, Daniel

doi:10.1016/j.jelechem.2003.08.035

Cited by 43 publications

(38 citation statements)

References 38 publications

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“…The working electrode was rotated with constant speed of x ¼ 300 rotations/min (rpm) to insure the high homogeneity of the deposited layer. 22 After growth, the nanowire ensembles were thoroughly rinsed with milliQ water, dry in air and were subsequently annealed at 400 C for 1 h to reduce the residual n-type doping.…”

Section: Nanowire Synthesis and Characterizationmentioning

confidence: 99%

Characterization and modeling of a ZnO nanowire ultraviolet photodetector with graphene transparent contact

Zhang

Babichev

Jacopin

et al. 2013

Journal of Applied Physics

113

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We report the demonstration of a ZnO nanowire ultraviolet photodetector with a top transparent electrode made of a few-layered graphene sheet. The nanowires have been synthesized using a lowcost electrodeposition method. The detector is shown to be visible-blind and to present a responsivity larger than 10 4 A/W in the near ultraviolet range thanks to a high photoconductive gain in ZnO nanowires. The device exhibits a peak responsivity at 370 nm wavelength and shows a sub bandgap response down to 415 nm explained by an Urbach tail with a characteristic energy of 83 meV. The temporal response of the detector and the power dependence are discussed. A model of the photoconductive mechanism is proposed showing that the main process responsible for the photoconductive gain is the modulation of the conducting surface due to the variation of the surface depletion layer and not the reduction of recombination efficiency stemming from the electron-hole spatial separation. The gain is predicted to decrease at high incident power due to the flattening of the lateral band bending in agreement with experimental data. V C 2013 AIP Publishing LLC.

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Section: Nanowire Synthesis and Characterizationmentioning

confidence: 99%

Characterization and modeling of a ZnO nanowire ultraviolet photodetector with graphene transparent contact

Zhang

Babichev

Jacopin

et al. 2013

Journal of Applied Physics

113

View full text Add to dashboard Cite

show abstract

“…The entire cell volume was simulated by Mandin et al (Mandin, et al, 2004) whereas only a small amount of liquid below a rotating disc ring electrode was considered by Dong et al (Dong, Santhanagopalan, & White, 2007). In those works, only the electrode active face is in contact with the fluid.…”

Section: Two-dimensional Modelsmentioning

confidence: 99%

“…In accordance with these authors, the simulated fluid velocity field and that obtained with the theoretical model proposed by von Kármán (von Kármán, 1921) and Cochran (Cochran, 1934) are in good agreement. Mandin et al (Mandin, et al, 2004) also carried out two-dimensional axisymmetric numerical simulations of a entire electrochemical cell with a RDE. The system studied by these authors is schematically represented in Figure 7.…”

Section: Two-dimensional Modelsmentioning

confidence: 99%

“…However, apparently these authors only made use of one of the two sets of equations that comprises the solution obtained by Cochran. (Mandin, et al, 2004). The line in red represents symmetry axis.…”

Section: Two-dimensional Modelsmentioning

confidence: 99%

“…This task is hard to accomplish even using modern non-intrusive techniques such as Particle Imaging Velocimetry (PIV). Nevertheless, recently the flow field inside a confined electrochemical cell configuration was measured through Laser Doppler Anemometry (Mandin, Pauporte, Fanouillere, & Lincot, 2004). Another alternative to obtain an accurate approximation of the velocity and pressure profiles due to a rotating disk electrode is to use the Computer Fluid Dynamics (CFD) technique in which, the three-dimensional Navier-Stokes equations are solved numerically.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Hydrodynamic Analysis of Electrochemical Cells

Real-Ramirez¹,

Gonzalez-Trejo²

2011

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Simulation studies on a rotating ring disk electrode system: Role of supporting electrolyte in determination of relevance of ionic migration

Guha¹

2012

AIChE Journal

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Most of the past theoretical works with the rotating ring disk electrode (RRDE) system have been restricted to situations where supporting electrolyte concentration is large enough so that the effects of migration of ionic species in the solution becomes negligible. In this work, effects of ionic migration have been investigated for a RRDE system by solving the differential equations describing mass transfer in presence of ionic migration using numerical technique. Two cases were considered for simulation, presence and absence of migration of ionic species. Results indicate that in presence of migration, collection efficiency of a RRDE system increases for all electrode geometries and concentration boundary layer thickness reduces. Results also indicate that collection efficiency is dependent on electrode geometries. The system chosen for simulation is copper sulfate solution of 0.1 (M) concentration with little supporting electrolyte. It is also noticed that migration effect remains important for supporting electrolyte concentration as high as 0.1 (M). Limiting current condition was assumed.

show abstract

Modelling and numerical simulation of hydrodynamical processes in a confined rotating electrode configuration

Cited by 43 publications

References 38 publications

Characterization and modeling of a ZnO nanowire ultraviolet photodetector with graphene transparent contact

Characterization and modeling of a ZnO nanowire ultraviolet photodetector with graphene transparent contact

Hydrodynamic Analysis of Electrochemical Cells

Simulation studies on a rotating ring disk electrode system: Role of supporting electrolyte in determination of relevance of ionic migration

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