Green Synthesis and Electrochemical Study of Undoped and Doped Al2O3 Nanoparticles Using Hibiscus rosa-sinensis Leaves Extract

Farzana Haider(1*), Gul Asimullah Khan Nabi(2), Kiran Shah(3), Kafeel Ahmad Khan(4), Haseeba Khan(5)

(1) Department of Chemistry, Bacha Khan University, Charsadda, 24420, Khyber Pakhtunkhwa, Pakistan
(2) Department of Chemistry, Bacha Khan University, Charsadda, 24420, Khyber Pakhtunkhwa, Pakistan
(3) Department of Chemistry, Bacha Khan University, Charsadda, 24420, Khyber Pakhtunkhwa, Pakistan
(4) Department of Chemistry, Bacha Khan University, Charsadda, 24420, Khyber Pakhtunkhwa, Pakistan
(5) Department of Chemistry, Bacha Khan University, Charsadda, 24420, Khyber Pakhtunkhwa, Pakistan
(*) Corresponding Author


In the present work, nanoparticles of Al2O3, Cu-Al2O3, and Ni-Al2O3 were prepared using Hibiscus rosa-sinensis plant leaf extract through co-precipitation method. The prepared nanomaterials were characterized through TGA, EDX, SEM, UV-Vis, XRD, and FTIR instruments. The electrochemical behavior of Al2O3, Cu-Al2O3, and Ni-Al2O3 has been studied in DMF solution in the potential ranges from −1.5 to 1.5 V. The nanoparticles are thermally stable, according to the TGA, and the XRD patterns revealed that all the Al2O3, Cu-Al2O3, and Ni-Al2O3 particles were crystalline, with the mean sizes of 12.44, 34.61, and 31.63 nm, respectively. The cyclic voltammogram showed a cathodic peak (Epc) at 0.49 V with an anodic counterpart (Epa) at 0.49 V [E1/2 = 1.748 V]. The optical band gaps of Al2O3, Cu-Al2O3, and Ni-Al2O3 were 3.8, 3.2 and 3.65 eV, owed a cathode. It is observed that the electrochemical behavior of Ni-Al2O3 was identical to that of Al2O3 and Cu-Al2O3. The anodic and cathodic peak values rise with the scan rate. The one-electron oxidation and reduction processes are reversible, as seen by the shifting cathodic peak value toward higher negative values. All cycles exhibit absorption has a constant anodic current. This result indicated the diffusion-based redox process.


cyclic voltammogram; electrochemical behavior; co-precipitation method; Al2O3; Hibiscus rosa-sinensis

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