Scanning Droplet System (SDC) uses a compact peristaltic pump to force electrolyte through a small diameter tube and into a specifically designed head. This PTFE-based SDC head is machined to allow electrolyte to flow past an installed Reference Electrode and then to a port at the base of the head. When the head is positioned sufficiently close to the sample a droplet forms between the head and sample. Tubing is also connected to an output port of the PTFE head. A second channel of the same peristaltic pump is then used to draw electrolyte past an installed Counter Electrode and out of the system. SDC experiments can be configured to either:
- Apply a constant bias (potential, current or open (circuit) and increment position of the head creating a data map.
- Apply a static or dynamic electrochemical signal, such as a EIS experiment, a Tafel plot, or a Cyclic Voltammetry experiment as the head is kept in a fixed location.
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- SDC technique confines the electrochemical measurement to the small droplet of electrolyte, defining the area of the electrode/electrolyte interface.
- Samples can be investigated without cutting the sample or subjecting areas to different electrolyte exposure times.
- Capable of running both constant bias/swept position plots for data maps and fixed-position/ dynamic signal plots for Cyclic Voltammetry, Tafel, EIS, etc.