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<< Click to Display Table of Contents >> Navigation: Experiments > K - Solar Cells > Potentiostatic - Constant Illumination > Potentiostatic - Constant Illumination - Experimental Sequence |
Run the Potentiostatic - Constant Illumination standard technique by selecting Experiment > Electrochemical Energy > Potentiostatic - Constant Illumination from the Framework™ menu bar. This initiates the following sequence of events:
1.Framework™ creates a Runner window, and the Potentiostatic-Constant Illumination.exp script is run in this window.
2.The script creates the Setup dialog box which becomes the active window and accepts changes in the experimental parameters. This Setup window remembers the experimental settings from the last time this script was run. To restore the parameters to the values defined in the script, click the Default button. If the Advanced Cell Setup is on, a second Setup dialog box with hardware configuration details becomes the active window, allowing you to modify the hardware configuration of the SERF potentiostat used during the experiment.
3.The script now obtains the use of the potentiostat specified during Setup and opens the data file using the Output name. If the potentiostat is in use or the file cannot be opened, the script returns you to the Setup dialog box. The file header information is written to the data file. This information is written to the file prior to data acquisition. If the experiment is aborted, the file contains only this information. This header information includes:
•Tags identifying possible analyses.
•The current time and date.
•A list of the Setup parameters.
4.The LED is turned on. The applied LED Current I versus time is displayed. The LED stays on during the whole experiment.
5.The script conditions the electrode if Conditioning was specified in the Setup. Conditioning is done by applying a fixed potential for a defined time. It establishes a known surface state on the working electrode. A plot of current versus time is displayed during the Conditioning.
6.The cell is turned off and the specimen's Eoc is measured. If an Init. Delay is turned on in the Setup, this step lasts for the time specified as the Delay Time, or until the potential stabilizes . If no Initial Delay is specified, this step only lasts long enough for Eoc to be measured. A plot of potential versus time is always displayed. The last measured potential is recorded as Eoc.
7.data acquisition begins. The sample is potentiostated at the Initial E, a delay of one sample period occurs, and a reading of the current is taken. A delay of one Sample Period occurs, and the next current reading is taken. This process of delaying and acquiring data points continues for a time set by Initial Time Setup parameter. The potential is then stepped to the Final E. The process of taking current readings is continued at this new potential for a time set by the Final Time parameter. At each point, the current range is automatically switched to the optimal range for the measured cell current.
8.If iR-compensation has been selected, the applied potential is corrected for the measured iR-drop of the preceding point. A plot of current vs. time is displayed during the scan.
9.The data are written to the output file and the script cleans up and halts.
10.When the scan is over, the cell is turned off. The LED is also turned off. The acquired data are written to the output file.
11.The script then waits for you to click the F2-SKIP button. When you do, the script closes everything that is open, including the Runner window.