Analytical and Bioanalytical Electrochemistry is an international scientific journal, which is published online every 3 months (since 2009), every 2 months (since 2011) and monthly (since 2018) by Center of Excellence in Electrochemistry, University of Tehran Analytical and Bioanalytical Electrochemistry - 16 5 2024 05 31 Electrodeposition of Copper Doped ZnO Nanotubes and Its Impact on Photoelectrocatalytic Property of ZnO Nanostructure in Improving Photoelectrochemical Water Splitting 423 437 713502 10.22034/abec.2024.713502 EN Tahere Mollaei Faculty of Chemistry, K.N. Toosi University of Technology, Tehran, Iran Ahmad Rouhollahi Faculty of Chemistry, K.N. Toosi University of Technology, Tehran, Iran 0000-0002-6050-4011 Mojtaba Hadi Department of Chemistry, Faculty of Sciences, University of Qom, Iran Fatemeh Rasouli Faculty of Chemistry, K.N. Toosi University of Technology, Tehran, Iran Journal Article 2024 01 13 The ZnO nanorods, ZnO nanotubes, and Cu-doped ZnO nanotube photoanodes were electro-synthesized to improve the photoelectrochemical water-splitting performance. The structural, optical, morphologic, and photoelectrocatalytic properties of the prepared samples were investigated. UV-visible results show Cu-doped ZnO nanotube photoanode extends the visible light absorption and reduces the band gap. Mott-Schottky analysis displays that the Cu-doped ZnO nanotube sample has higher electron density than other samples. Nyquist plots indicate that Cu doping reduces the charge transfer resistance and improves charge transfer. By comparing the LSV voltammograms, it was found that Cu-doped ZnO nanotube photoelectrode has a maximum photocurrent density of 78.3 µA/cm2 at 1.6 V vs. RHE. While the value of photocurrent density obtained for pure ZnO nanorods sample is 9.6µA/cm2 at 1.6 V vs. RHE. Due to the role of Cu in reducing the band gap and reducing the charge recombination rate, Cu doping enhances the photoelectrochemical efficiency of the ZnO nanotube. https://www.abechem.com/article_713502_5fa17ff0d3161fe22f621b541043cf26.pdf