Assessing the electrochemical performance of hierarchical nanostructured CuO@TiO2 as an efficient bi-functional electrocatalyst

• Published in: Journal of the Iranian Chemical Society 2020-03, Vol.17 (3), p.649-662
• Main Authors: Mujtaba, Ayesha, Janjua, Naveed Kausar, Yasin, Tariq, Sabahat, Sana
• Format: Article
• Language: English
• Subjects: Analytical Chemistry; Biochemistry; Chemistry; Chemistry and Materials Science; Electrocatalysts; Electrochemical analysis; Electrochemical impedance spectroscopy; Glassy carbon; Glucose; Impregnation; Inorganic Chemistry; Methanol; Morphology; Nanoparticles; Organic Chemistry; Original Paper; Oxidation; Physical Chemistry; Signal to noise ratio; Substrates; Titanium dioxide
• ISSN: 1735-207X; 1735-2428
• DOI: 10.1007/s13738-019-01797-x

Fabrication and attractive performance of CuO nanoparticles coated onto TiO 2 substrate (CuO@TiO 2 ) as electrocatalysts for glucose and methanol electrooxidation are detailed in this article. These bi-functional electrocatalysts were prepared by impregnating (5–25 wt%) CuO nanoparticles onto nanosized TiO 2 substrate and were characterized for morphology and composition. Cyclic voltammetry and electrochemical impedance spectroscopy provided a detailed account of their electrochemical capacity. All samples in CuO@TiO 2 series were tested for probable electrocatalysis; however, 5CuO@TiO 2 possessed significantly improved electrocatalytic activity for methanol and glucose electrooxidation. This can be attributed to the better conductivity of the electrocatalyst showing that electrocatalytic activity is limited by the amount of CuO loading on CuO@TiO 2 electrocatalyst. The involvement of the Cu (II) to Cu (III) reversible redox couple was evident in the electrocatalytic oxidation. The sensitivity of 7.15 μA mM −1  cm −2 and a detection limit of 235.0 μM for glucose at a signal to noise ratio of 3 were obtained using 5CuO@ TiO 2 -modified glassy carbon electrode.