Study of Ni²⁺/Ni³⁺ Redox Couple and Electrocatalytic Responses of Ni on Nitrogen-Doped Carbon for Urea Non-Enzymatic Detection

Abstract:

A novel redox couple of metallic nickel (Ni) catalyst can become a great candidate of non-enzymatic detection. By taking advantage of fast electron transfer, Ni redox couples can be tailored as pseudo-enzyme in urea measurement. In this study, Ni catalyst on nitrogen doped carbon (Ni-NC) was synthesized and characterized morphological, elemental, and electrocatalytic properties in comparison to different configuration of pure nickel (Ni), Ni with carbon (Ni-C), and bare carbon electrode, assessed by cyclic voltammetry and differential pulse voltammetry. By examining various Ni redox couples in rapid electron transfer process, the prominent anodic and cathodic peaks of Ni²⁺/Ni³⁺ were applicable to detect urea in the detection range of 1-20 mM, with an excellent sensitivity and relative standard deviation of 1.634 μA.mM^-1 (R² of 0.989) and 4.89%, respectively. Therefore, Ni-NC can find practical applications for material sensing device toward non-enzymatic urea measurement.

• Periodical: Key Engineering Materials (Volume 877)
• Pages: 102-107
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.877.102
• Online since: February 2021
• Authors: Narawee Asavakijthananont, Metini Janyasupab*
• Keywords: Biosensor, Electrochemical Catalyst, Nickel, Nitrogen-Doped Carbon, Non-Enzymatic Detection, Urea

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