Assessing the electrochemical performance of hierarchical nanostructured CuO@TiO2 as an efficient bi-functional electrocatalyst
- 10 Downloads
Fabrication and attractive performance of CuO nanoparticles coated onto TiO2 substrate (CuO@TiO2) 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 TiO2 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@TiO2 series were tested for probable electrocatalysis; however, 5CuO@TiO2 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@TiO2 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@ TiO2-modified glassy carbon electrode.
KeywordsCuO@TiO2 nanopowders Cyclic voltammetry Electrochemical impedance spectroscopy Electroxidation
The research work elucidated in this paper was carried out at laboratory provisions in Quaid-i-Azam University Islamabad. Authors greatly acknowledge NUST Islamabad for the SEM and EDX mapping facility. HEC Projects No. 1718 and 4768 are highly acknowledged for Gamry instrument.
- 1.O. Popovski, Electrocatalysts in the last 30 years–from precious metals to cheaper but sophisticated complex systems. Bull. Chem. Technol. Maced. 23, 101–112 (2004)Google Scholar
- 4.S. Thangavel, N. Raghavan, G. Venugopal, Magnetically Separable Iron Oxide‐Based Nanocomposite Photocatalytic Materials for Environmental Remediation, Photocatalytic Functional Materials for Environmental Remediation (Wiley, 2019), pp. 243–265Google Scholar
- 16.B. Khodadadi, A.Y. Faal, A. Shahvarughi, Tilia platyphyllos extract assisted green synthesis of CuO/TiO2 nanocomposite: application as a reusable catalyst for the reduction of organic dyes in water. J. Appl. Chem. Res. 13, 51–65 (2019)Google Scholar
- 24.C. Canales, L. Gidi, G. Ramírez, Electrochemical activity of modified glassy carbon electrodes with covalent bonds towards molecular oxygen reduction. Int. J. Electrochem. Sci. 10, 1684–1695 (2015)Google Scholar
- 27.P.D. File, Joint committee on powder diffraction standards (ASTM, Philadelphia, PA, 1967), pp. 9–185Google Scholar
- 35.A.J. Bard, L.R. Faulkner, Fundamentals and Applications, Electrochemical Methods, 2nd edn. (Wiley, New York, 2001)Google Scholar
- 37.S. Thiagarajan, M. Rajkumar, S.-M. Chen, Nano TiO2-PEDOT film for the simultaneous detection of ascorbic acid and diclofenac. Int. J. Electrochem. Sci. 7, 2109–2122 (2012)Google Scholar
- 42.E. Biçer, P. Çetinkaya, Electrochemical behaviour of the antibiotic drug novobiocin sodium on a mercury electrode. Croat. Chem. Acta 82, 573–582 (2009)Google Scholar