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- W4230486468 abstract "The capillary-based droplet cell is well established in microelectrochemical surface analysis down to the μm range. The potentiostatic 3-electrode arrangement allows all common techniques like cyclovoltammetry, impedance spectroscopy and current transients of potential steps. A limiting factor was the immobile electrolyte, which meant an accumulation of products or depletion of educts, especially at larger current densities. Reaction products like gases (bubbles of O2 or H2) or precipitates blocked the capillary. Processes at larger current densities require a moving electrolyte. Examples are pulse deposition of metals, local corrosion and electrochemical machining (ECM), which means an anodic dissolution at current densities up to 100 A/cm2. A new concept was developed, based on capillaries made of glass tubes with a partition. Accordingly, we employed two separated channels, one channel is used as an electrolyte inlet, the other as the outlet. One of the channels includes a thin gold wire as a counter electrode. A special gear pump moves the electrolyte with velocities up to 70 m/s in the mouth of the capillary. Current densities >100 A/cm2 become possible under these conditions. Dissolution processes like ECM normally require an identification of the products, which became possible by adding a flow-through micro cuvette of an UV-Vis spectrometer at the electrolyte outlet." @default.
- W4230486468 created "2022-05-11" @default.
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- W4230486468 date "2004-07-01" @default.
- W4230486468 modified "2023-09-24" @default.
- W4230486468 title "A new microcell or microreactor for material surface investigations at large current densities" @default.
- W4230486468 doi "https://doi.org/10.1016/s0013-4686(04)00254-3" @default.
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