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Experimental

  • Page ID
    62059
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    Sonogel-Carbon Electrode

    For the fabrication of sonogel-carbon electrode, 1.5 mL of methytrimethyoxysilane (MTMOS), should be added into 0.3 mL of 0.2 M HCl solution. The mixture should be ultrasonicated for 15 seconds. Then, add 3 grams of graphite carbon powder into the MTMOS solution and mix thoroughly for 10 minutes (condensing the SGC). Install a 0.25 mm copper wire inside of the 0.69 mm inner diameter glass tube to use as the body of the SGC electrode. The glass tube should then be filled with the SGC material.

    Modification With the TiO2

    The TiO2 should be synthesized via sol-gel method. Add the molar ratio of Tween-80: isopropanol:acetic acid:titanium tetraisopropoxide=1:45:6:1. The tip of the SGC should be dipped in the TiO2 sol-gel for 3 seconds and then heated in an oven for 20 minutes at 500οC. To have a control must make ten SGC electrode without TiO2 (called a bare electrode) and SGC electrode modified with P3MT (based on the articles of suggested readings on P3MT).

    Once made, there should be ten modified sonogel-carbon TiO2 and ten bare sonogel-carbon electrodes. Prepare the 1 mM- 5 mM catechol diluted in 10 mM sulfuric acid and 1mM – 5mM ascorbic acid diluted in 10 mM sulfuric acid and an equal mixture of catechol and ascorbic acid (5 mM catechol + 5mM ascorbic acid). Also, prepare the 0.05 M 3-methythiophene solution diluted with 0.1 M tetrabutylammonium tetrafluoroborate diluted in acetonitrile. Read the Epsilon handout on cyclic voltammogram instrumentation before proceeding. Run all cyclic voltammograms at 100 mV/s. Check with instructor to make sure the data that will be carried out are correct to assist with the pre-post-test questions and if the range that the cyclic voltammograms are in a logical range as determined from the suggested readings (utilize suggested readings to assist with how to prepare a P3MT electrode). To compare stability of electrodes run the cyclic voltammograms (CV) for 20 scans. Run three trials to obtain reproducible results for each CV (catechol SGC/TiO2, ascorbic acid SGC/TiO2, catechol + ascorbic acid SGC/TiO2, catechol + ascorbic acid bare electrode, catechol P3MT, ascorbic acid P3MT, catechol + ascorbic acid P3MT).


    This page titled Experimental is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by Contributor.

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