Copper Bismuth Oxide Research Articles

Electrochemical preparation of CuBi2O4 nanoparticles on nanoporous stainless steel as a binder-free supercapacitor electrode

In this work, copper-bismuth oxide (CuBi2O4) nanoparticles were supported on nanoporous stainless steel by a simple electrochemical deposition method and then was employed as a binder-free electrode for supercapacitor application. The structure and surface morphologies of the nanoparticles-supported on nanoporous stainless steel were investigated using X-ray diffraction spectroscopy, energy dispersive X-ray spectroscopy and scanning electron microscopy. The electrochemical properties of the proposed electrode were examined using cyclic voltammetry and galvanostatic charge–discharge techniques in different electrolytes. The results showed that the proposed electrode exhibited a maximum specific capacitance of 144 mA h g−1 or 647 F g−1 at a current density of 1.0 A g−1 in 6.0 mol L−1 KOH with excellent long-term cycling stability (80% capacitance remained after 500 charge–discharge cycles). The proposed nanostructure is a suitable candidate for electrode material in energy storage devices.

Fabrication of CuBi2O4 photocathode through novel anodic electrodeposition for solar hydrogen production

Copper bismuth oxide (CuBi2O4) film electrodes were fabricated by anodic co-electrodeposition of Bi2O3 and CuO, followed by heat treatment in air at 500°C. The compositions of the electrolyte solution, such as concentrations of Cu2+, Bi3+, and tartaric acid, alkaline strength, and temperature, were optimized to fabricate pure CuBi2O4 films on FTO substrates. XRD and optical absorption were employed to confirm the formation of CuBi2O4, and SEM observation showed the fabrication of a closed packed film with good contact to the FTO substrate. Mott-Schottky plots based on Nyquist plots at various potentials gave the flat band potential of 0.62V (vs. Ag/AgCl) at pH 6.0. Since the band gap energy measured was 1.80eV, the conduction band bottom locates at -0.98V (vs. NHE). At the potential more negative than 0V (vs. Ag/AgCl), the photo cathodic current for hydrogen production was observed under visible light irradiation in a deoxygenated 0.1M Na2SO4 solution. The film electrode sustained the photo electrochemical activity in the electrolyte solution at -0.3V (vs. Ag/AgCl), at least, for 100min.

Screening of transition and post-transition metals to incorporate into copper oxide and copper bismuth oxide for photoelectrochemical hydrogen evolution

A new dispenser and scanner system is used to create and screen Bi-M-Cu oxide arrays for cathodic photoactivity, where M represents 1 of 22 different transition and post-transition metals. Over 3000 unique Bi : M : Cu atomic ratios are screened. Of the 22 metals tested, 10 show a M-Cu oxide with higher photoactivity than CuO and 10 show a Bi-M-Cu oxide with higher photoactivity than CuBi2O4. Cd, Zn, Sn, and Co produce the most photoactive M-Cu oxides, all showing a 200-300% improvement in photocurrent over CuO. Ag, Cd, and Zn produce the highest photoactivity Bi-M-Cu oxides with a 200-400% improvement over CuBi2O4. Most notable is a Bi-Ag-Cu oxide (Bi : Ag : Cu atomic ratio of 22 : 3 : 11) which shows 4 times higher photocurrent than CuBi2O4. This material is capable of evolving hydrogen under illumination in neutral electrolyte solutions at 0.6 V vs. RHE when Pt is added to the surface as an electrocatalyst.

CuBi 2O 4 single crystal nanorods prepared by hydrothermal method: Growth mechanism and optical properties

The synthesis of copper bismuth oxide (CuBi 2O 4) nanorods with single crystal structure by hydrothermal method is first reported here. The prepared CuBi 2O 4 nanorods are characterized by X-ray diffractometer, scanning electron microscopy, transmission electron microscopy (TEM) and high resolution TEM. It is found that the concentration of reagent cupric acetate has strong effect on the purity and microstructure of the prepared samples. The growth process is investigated in detail. It is proposed that the nanorods are evolved from spherical particles with oriented attachment mechanism followed by dissolution-splitting process. The optical properties of the samples are detected by UV–vis spectrometer and photoluminescence spectrometer and exhibit strong dependence on surface defect states and microstructure feature, which is mainly determined by preparation conditions.

A review on microwave synthesis of electrode materials for lithium-ion batteries

The applications of microwave processing of electrode materials for Li-ion batteries have been reviewed. This paper intends to insist at the advantages of the microwave processing and its credentials for commercialization. In order to achieve successive commercialization/industrial application, a systematic understanding of the microwave processing becomes imperative. In the advent of this, an extensive study on the behavior of material in electromagnetic field has been presented. Microwave processing of various materials like lithium cobalt oxide, lithium manganese oxide, lithium nickel oxide, lithium titanium oxide and their derivatives, copper bismuth oxide, antimony sulfide, and tin oxide graphite has been reviewed in detail. Also, the dependence of microwave processing in operating frequency, geometry, preheating, soaking time, susceptor material, and single (or) multimode cavity has been reviewed.