Investigation of Voltammetric Reduction Profile of N2O on Platinum Working Electrode

  • Siswoyo Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Jember
  • Harum S. Andini Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Jember
  • Dwi Indarti Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Jember
Keywords: nitrous oxide, voltammetry, electrochemical sensor, platinum microelectrode

Abstract

This paper reports the development of N2O voltammetric sensor that focused on optimization of potential scan rate and concentration of electrolyte, as well as evaluation of the presence some interfering gases. Pt microelectroda, Au metal wire and mini Ag/AgCl serve as the working, counter and reference electrode respectively. Solution of tetrabutyl ammonium perchlorate in dimethylsulfoxide (0.010, 0.025, 0.050, 0.075, 0.100, and 0.150 M) was used as electrolyte solution. The scan rate applied to the working electrode was varied: 20, 40, 60, 80, 100, and 200 mV/sec, in the potential range of 0.0 to -2.8 volts. O2 and CO2 were chosen as the interfering gases as their presence in the ambient air are very dominant. The optimum sensor response was achieved at a scan rate 100mV/sec and concentration of 0.100 M TBAP and able to work well on N2O gas concentration range from 4% to 20%. O2 was found as main interference, however CO2 was not providing a significant interference response to the sensor.

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Published
2019-06-28