Potentiostat
Contents
1. 10 volts2. s indicate the status of the experiment The E_reference_window shows the curve of the reference potential as a function of the time The first scan can differ from the others if start potential is not equal to the min or max potential After the experiment is done one of the former scans can be reviewed with the Review button Eref B xv Graph l I 5000 10000 Time ms measurement Scans J pre treatment Q scan 4 constant Iworking mA potential _ pre toos v start stop pot step 0 05 y J my via 04 I 0 1 0 0 0 1 0 2 0 3 Ereference scan A 1 0 4 thermal current range im i new range out of range current overflow scanning waiting ready Fr m p l4 current scan file path SE save Ru esammino tricloro xls 3 2 1 Settings e Potential Start stop Start and stop potential Pre Maximum potential Via Minimum potential e Timing Scanspeed Potential increase or decrease speed Pot step Potential increase or decrease per step Vrije Universiteit Amsterdam Faculty of Sciences check scsi P Review ManualPotentiostat doc Measurement e Scans Number of scans in an experiment e Pretreatment Waiting time before the first scan starts if constant is chosen If scan is pre treatment chosen a scan from the pre n constant
3. ManualPotentiostat doc 1 Table of contents Potentio stat 1 SAFETY INSTRUCTIONS ccccccccceccsecsssssecsseeseesseeseeeseees 2 2 GENERAL INFORMATION ccccssceeecseceeeensenseeeeeneeees 2 3 USER GUIDE ccc cceeeeeeeeeeeesenseeeeensenseensensensenseenesaes User Manual 3 1 Sweep and TACOS wcsssecceccecssssscosesnetecencssdansnasedanssueersnseceecunsncassesesabadavesseansecgcesteuase 3 1 1 BS SCID 6 a2 siecs ate octon a nasinatibe ded E 3 1 2 CUTE TONDO aprins T AEE N A EEE 3 1 3 COV OUTON OT oriista inne a E AENA E 3 1 4 E A EE E E EE N N A O E I EE T 32 yole Vollametry assccvecccscccerccs cecoresscccsecesccvocesisececesscecenesssccoecssccdececteccsesssceeceess I2 e E E EO FLA S E E E O OO 4 CONNECTIONS u csssssssssssssssssssssccssseesessessssessessssnseeessseessee en es 5 SPECIFICATIONS cccccceecceeceeeeeecnsenseensenseenseasenseeennsenes Vrije Unive rsiteit amsterdam 5 1 1 Power CONSUMIDUION scissione eeka aain aiaa i 52 E a AE A E E E EAA N E N A ETE 5 1 3 Technical SPECIIC ALIONS v1ccics50 sesasonesncsnnnarnsenneanas sada prdustaanuatongensesegcontaraeaneiancs 6 IN LABVIEW USED FORMULAG ccceceseeeeeeeneeeeeees Peter Wiersma September 28 2004 Project ID 20049101 Electronics Group Filename Documenti Faculty of Sciences Pages 5 Vrije Universiteit Amsterdam the Last save November 10 2005 Netherlands Phone 31 20 4447432 Email pg wiersma few vu nl Fax 31 20 4447899 W
4. eb http www few vu nl elec Electronics Group Vrije Universiteit Amsterdam Faculty of Sciences ManualPotentiostat doc 1 Electronics Group Eref Electrochemical Safety instructions There are no serviceable parts inside the device So there is no need for the user to open the device If one or more Power supplies fails led indicators or when other problems occurs please contact the Elektronicagroep FEW General information The potentiostat is a highly specialized power supply power amplifier used to maintain constant potential across two electrodes of a electrochemical cell by varying the conditions of a third one The desired potential between the working end reference electrode Eref is delivered by a external supply and kept constant by the counter electrode The reference potential will be varied and the current flowing into the counter is measured The connection between these quantities is shown in a XY graph Just when a measurement is performed the cell is connected to the potentiostat otherwise it is switched off reference Eref V Fig 1 Schematische voorstelling van een potentiostaat 3 User guide The measurement is controlled by two LabView programs Potentiostat Sweep and rates Potentiostat Cyclic Voltametry To do so there is a National Instruments Data Acquisition Card required type PCI 6014 3 1 Sweep and rates In this mode you can create your own waveform for the
5. potential to the start potential is performed before the first scan begins Jfa sec e Current Range The expected countercurrent can be chosen with the help of a pop up menu 3 2 2 Graphs Two graphs are used The E_reference_window shows the curve of the reference potential as a function of the time XY_graph_window shows the reference potential versus the counter current 4 Connections The potentiostat is connected to the Data Acquisition Card via a flat cable with wide scsi_connectors The electrochemical cell is connected with the help of an 8_pin Lemo Connector When this plug is removed the power of the amplifiers is disconnected Electronics Group Vrije Universiteit Amsterdam Faculty of Sciences ManualPotentiostat doc 5 6 5 Specifications 5 1 1 Power consumption 5 1 2 Fuses There are three fused power supplies involved with the potentiostat All of them are 100mA A fused mains chassis plug is used with 100 mA slow fuses 5 1 3 Technical specifications Electronics Group Vrije Universiteit Amsterdam Faculty of Sciences In Labview used formulas dV amplitude offset phase Tscan frequency samples updaterate Vmax Vmin dV 2 2xdV Vmin offset Vstart offset x 90 Vmax offset 2xdV scanspeed 1 Tscan 2xdV pot step samples Tscan Counter current and reference potential The current range is from 10 uA to 50 mA The reference potential is from 10 to
6. reference potential Waveforms can be saved for later use and as a matter of fact load from disk Both the reference potential as well as the working electrode current are plotted against time Once the settings are established the experiment can be initiated by the Start button Before the experiment starts you will be asked where to store your data Once the start button is pushed no more changes in the settings are possible The measurement is stopped by the stop button or ad the end of the cylcus i settings Potential Segment type mv Sample time ms Total time s current range Po ten ti ostat Scanrate m s Step pot mi nae rang 20049101 Sweep en rates i 1000 200 60 l l 1 thermal sep fo00 0 100000 0 150000 0 200000 0 overflow 200 0 J 4 g step 7 400 0 0 2 3 6 7 3 9 Amplitude 200 0 sa 1400 oim yf 400 0 step ai Jo 600 0 i Jeo 100 10 7 om m OC 800 0 1000 0 I 1 0 50000 0 Preview Time a 500 10 10 Configuration config file path 3 oy 900 20 20 data file path E probeersels orc_ag 10 zi fioo 100 10 osm ess measure Iworking oo Eref 0 4 0 00772 at Eref im oO N Yu 1 0 1 l l l 1 l 1 l l 0 20000 40000 60000 100000 120000 140000 160000 180000 1 80000 Measure Ti Vrije Universiteit Amsterdam Faculty of Sciences ManualPoten
7. tiostat doc 3 1 1 3 1 2 3 1 3 3 1 4 Electronics Group Settings The waveform can be composed in maximum 10 steps In each step one can ike come use a step a staircase sweep or disable s Mcc this step not used The meaning of the values in the middle and right column differ for step and staircase mode The potential column gives the end potential for the particular step The starting potential is the end potential from the previous step In the preview window the composed waveform is showed Current range EE The expected countercurrent can be chosen with the help of Eri a pop up menu 10m ki Configuration Two buttons are available save the composed configuration to file and load a configuration from file Settings will be saved separate from the measuring data Graphs Two graphs are used Preview shows the composed waveform and Measure shows Y time plots of both the reference potential and the working electrode current 3 2 Cyclic Voltametry In this mode the reference potential is changed in time The stop potential must have the same value as the start potential cyclic The reference potential is plotted against the working electrode current in an XY graph Once the settings are established the experiment can be initiated by the Start button Once the start button is pushed no more changes in the settings are possible Three Oblong Led
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