Electrochemical Behavior of Parallel Opposed Dual Electrode in a Microchannel

Abstract

The electrochemical behavior dependent on the microchannel depth is discussed using a parallel opposed dual electrode in the microchip. The microchannel depth was controlled easily by the thickness of the photoresist. Cyclic voltammetry (CV) was carried out with conventional mode and the generation-collection mode. High collection efficiency (max: 98%) and high current amplification (max: 5.2) were achieved without miniaturizing the dual electrode by micromachining techniques, when the microchip with the microchannel depth of 30 mm was used in the generation-collection mode at low sweep rates. Quantitative analysis was applied to electrochemically reversible species with a quicker response time of around a few seconds for the same microchannel depth on chronoamperometry (CA). We observed good linearity on the calibration plot of dopamine (2 Â 10 À6 -ca. 1 Â 10 À3 mol dm À3 ).

Fabrication of 3D Interdigitated Array Electrode Consisting of Au Nanoparticles and Its Application for Biosensing

“…EIS measurements were carried out at open circuit potential (OCP) without bias voltage in the frequency range of 0.110 5 Hz with a 5 mV amplitude using a potentiostat/galvanostat (Solartron SI-1287) and an impedance analyzer (Solartron SI-1254). Threeelectrode cell was used for the measurement as shown in Fig.…”

Design, fabrication, and characterization of a proposed microchannel water electrolyzer

“…On the other hand, shallower channels not only ensure more efficient heating of the electrolyte (and consequently more hydrogen production) but also lead to lower ohmic losses (IR drop) due to a lower electrical resistance. In fact, in a previous study on the electrochemical characteristics of potassium ferrocyanide in sodium sulfate buffer using planar electrodes, the ohmic losses were reported to significantly increase when the channel thickness increased from 30 μm to 200 µm and slightly change between 200 µm and 500 µm [33]. As our main objective was to maximize hydrogen production, we chose to perform studies with taller channels (200, 400 μm) since the ohmic losses within the electrolyte is almost constant for these channel heights and the effect of these losses is not expected to significantly influence the hydrogen production.…”

Voltammetric detection of titanium(IV) on interdigitated microelectrode array utilising its catalytically enhanced current with hydroxylamine

“…IDA thin structures [16][17][18][19][20] are very promising tools in electroanalytical chemistry due to their diffusion layers interaction as well as potentionality for microanalytical applications [21]. Effects from close geometrical constitution may serve as principles of very fast, sensitive and selective detections of important analytical species.…”