Improved Structural Stability of CuO Via Bi Doping for Glucose Sensing

• Published in: Meeting abstracts (Electrochemical Society) Vol. MA2023-02; no. 62; p. 2954
• Main Authors: Zhong, Jiajing, Zheng, Weiran
• Format: Journal Article
• Language: English
• Published: The Electrochemical Society, Inc 22.12.2023
• DOI: 10.1149/MA2023-02622954mtgabs
• ISSN: 2151-2043

Glucose sensing is of great importance in fields such as medical diagnostics, food industry, and environmental monitoring. Copper oxide (CuO) has shown promising results as an electrochemical sensor for glucose detection due to its high sensitivity and selectivity towards glucose molecules[1]. However, one of the key challenges is to maintain the morphology and crystal structure of CuO during long-term glucose electrooxidation. CuO is prone to phase transformation, which can lead to changes in its crystal structure and affect its electrochemical performance. Moreover, the stability of CuO can be affected by external factors such as applied potential and pH, which can induce corrosion and degradation of the CuO layer over time. In this contribution, we propose a novel approach to improve the structural stability of CuO via surface bismuth doping. The Bi-doped CuO was prepared via an ultrasonic method, generating homogenously distributed Bi atoms on the surface of CuO thin flakes. At Bi doping level between 5% to 10%, the structure of CuO retains, indicating the replacement of Cu by Bi atoms other than phase separation. The long-term electrochemical test showed <1% current loss with the 10% Bi-doped CuO while >30% current loss with the CuO ( Figure 1 ), suggesting that Bi atoms can act as the structural stabilizer for CuO electrocatalyst. Moreover, no significant sensitivity loss (~650 mA mM −1 cm −2 ) was observed after Bi doping. Our results demonstrate significant improvements in the CuO sensor's stability and accuracy, which can pave the way for its practical applications in various fields. Figure 1 Amperometric response of CuO and Bi-doped CuO (percentage shows the Bi/Cu ratio) during long-term glucose electrolysis. Reference: W. Zheng, Y. Li, L. Hu, L.Y.S. Lee, Sensors & Actuators: B. Chemical 2019 , 282, 187-196 Figure 1