|
<< Click to Display Table of Contents >> Navigation: Experiments > K - Solar Cells > BiPstat ChronoP Main - OCP Serf > BiPstat ChronoP Main - OCP Serf - Experimental Sequence |
Run the BiPstat ChronoP Main - OCP Serf standard technique by selecting Experiment > Electrochemical Energy > BiPstat ChronoP Main - OCP Serf from the Framework™ menu bar. This initiates the following sequence of events:
1.Framework™ creates a Runner window, and the BiPstat ChronoP Main - OCP Serf.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.If Init. Delay is on, the cell at the SERF potentiostat is turned off and the specimen's Eoc is measured for the time specified as the Init. Delay time, or until the potential stabilizes to a value less than the stability setting. A plot of potential versus time is always displayed. The last measured potential is recorded as Eoc. If Init. Delay is off, this step is skipped and Eoc is assumed to be 0.0 V vs. Eref.
5.The script conditions the electrode at the SERF potentiostat if the Condition Cell checkbox was active in the Setup. Condition Cell is done by applying a fixed potential for a defined time. A plot of current versus time is displayed during Condition Cell. No data are saved during this step.
6.Finally, the data acquisition process starts. Two runner windows appear. The first one shows the plot of the MASTER potentiostat – applied current signal versus time and LED voltage versus time. The second window shows the measured open-circuit potential versus time from the SERF potentiostat. The LED current is held at the Pre-step Current for the Pre-step Delay Time. This information is stored with the data file. The current is then stepped to Step 1 Current and held at that value for Step 1 Time. The current is then stepped to Step 2 Current and held at that value for Step 2 Time. If Step 2 Time is zero then the second step is skipped. Voltage and current readings at fixed time intervals (Sample Period) are taken during the steps in this experiment. Step 1 Current and Step 2 Current are repeated for the amount of Cycles set initially.
7.The data are written to the output file and the script cleans up and halts. When the scan is over, the cell is turned off. The acquired data are written to the output file. The script then waits for you to click the F2-Skip button. When you do so, the script closes everything that's open, including the runner window.