Abstract
In this exploratory study, an integrated electrode consisted of multi-walled carbon nanotubes (MWCNT) and urease enzyme (Ur) was used to conduct electro-catalytic oxidation of urea. The electrode was fabricated by sequential depositions of different layers of MWCNT, platinum metal, and Ur on ITO glass using mainly casting techniques. The enzyme layer was first utilized to hydrolyze urea to ammonia molecules, which was then supplied to the catalytic oxidation reaction as fuel. By doing so, the electrode was able to induce electrooxidation with a current density of 3.2 mA.cm−2 at 0.55 V obtained at urea concentration of as small as 0.1 M along with a good linearity of r2 = 0.9831.
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Nhiem, L.T. An alternative approach for utilizing urea as fuel source. Braz. J. Chem. Eng. 40, 797–802 (2023). https://doi.org/10.1007/s43153-022-00277-9
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DOI: https://doi.org/10.1007/s43153-022-00277-9