Effect of conductive substrate (working electrode) on the morphology of electrodeposited Cu₂O

Abstract

Cu 2 O thin films were electrodeposited from a Cu(II) acetate solution containing 0.02 M Copper(II) acetate (Cu(OAc) 2 ) and 0.1 Msodium acetate (NaOAc) at pH 5.6, using three different working conductive electrodes with approximately the same square resistance -indium doped tin oxide glass (ITO/Glass), fluorine-doped tin oxide glass (FTO/Glass), and Indium doped tin oxide Polyethylene terephthalate (ITO/PET)-under identical conditions using a common growth condition. The Cu 2 O thin films werecharacterized by means ofscanning electron microscopy (SEM), x-raydiffraction (XRD),current density versus growth time for Cu 2 O films, and electrochemical impedance spectroscopy (EIS). The results showed that the choice of substratematerials hasa crucial role in controlling of Cu 2 O growth. The charge transfer resistance (Rct) of FTO/Glass-Cu 2 O exhibits the lowest value; this means that FTO/Glass-Cu 2 O possess the highest electron transfer efficiency.All Cu 2 O films showed n-type semiconductor characteristic with charge carrier densities varying between 1.4 × 10 18 -1.2 × 10 19 cm −3 .

Synthesis of copper oxides films via anodic oxidation of copper foil followed by thermal reduction

“…Among various semiconductor materials for PEC photoelectrodes, cuprous oxide (Cu 2 O) is one of the most attractive materials because of its cheapness, environment safety, good value of band gap (2,0 -2,2 eV) which provide absorbance of considerable part of solar spectrum [7][8][9]. In order to provide all necessary requirements imposed for semiconductor materials for PEC applications, a variety of Cu 2 O structures (wires, cubes, polyhedral, flower-like structure, etc.)…”

Properties of electrochemically copolymerized aniline and melamine on functionalized multiwalled‐carbon nanotube film electrodes

“…An ideal capacitor has a 90 • negative phase angle characteristic of an EDLC while having a range from 65 • to 80 • in reality. [36] The phase angle values of the electrosynthesized fMWCNT/GCE, PMEL/fMWCNT/GCE and PANIMEL/fMWCNT/GCE film electrodes are close to the ideal value and also fall within the theoretical range suggesting good pseudocapacitive behavior. [37,38] One key observation is that the negative phase angles of both PANIMEL/fMWCNT/GCE and PANI/fMWCNT/GCE film electrodes were close with each other with only a small difference of 5 • .…”

“…The solution resistance (R S ) is given by the point of intersection with the real axis of the Nyquist plot at the high frequency region. [36] It is mainly caused by uncompensated solution resistance and the R S values of the electrodes in Figure 8b are noted to be very close with each other. By comparing the semicircle diameter of multiple Nyquist plots in Figure 8b, one can infer the extent of charge transfer resistance (R ct ) across all electrodes.…”

Studies on the substrate-dependent photocatalytic properties of Cu2O heterojunctions

“…During the electrodeposition of Cu 2 O, the conductivity of the substrate critically affected the morphology of the deposited Cu 2 O. 13,30 Obviously, there were signicant differences in the sheet resistance among TNA, FTO, and Ti, which were 2.64 AE 0.15 MU sq À1 , 7.86 AE 0.04 U sq À1 , and 1.66 AE 0.04 mU sq À1 , respectively.…”

“…[6][7][8] Cu 2 O behaves as a catalyst under dark conditions and photocathode under illumination. 4,9 Typically, Cu 2 O is grown on conductive substrates, such as Cu, 10 Ti, 11,12 Al, 10 uorine-doped tin oxide (FTO), [12][13][14] and indium tin oxide (ITO), 4,13 and can still behave as a photocathode.…”