The CuAlO2 delafossite complex was incorporated with nitrogen-doped reduced graphene oxide (N-rGO) and multiwalled carbon nanotubes (MWCNT) based nanocomposite (N-rGO-MWCNT/CuAlO2) for the hydrogen evolution reaction (HER). The CuAlO2 delafossite complex was made by self-combustion glycine nitrate process (GNP), and the N-rGO-MWCNT composite was prepared by the hydrothermal method. The morphology was characterized by spectroscopy and microscopy techniques. The materials were structurally well ordered with a porous structure and high surface area. The GCE/N-rGO-MWCNT/CuAlO2 electrode exhibited electrocatalytic activity for the hydrogen evolution reaction (HER) under strongly acidic conditions with a low over-potential, increasing reduction current, and a small Tafel slope of 48 mV dec−1 at 10 mA cm−1 with long-term stability under operating conditions.

The key to utilizing renewable energy is the development of promising new materials for electrocatalytic water splitting. Boron doped reduced graphene oxide/multiwalled carbon nanotubes (B-RGO-MWCNT) composite decorated with CuFeO2 complex modified glassy carbon electrode (GCE) was applied to the water electrolysis (HER). The B-RGO-MWCNT composite was prepared using the hydrothermal method and the CuFeO2 delafossite material was synthesized by a glycine nitrate process. Moreover, the material structures of B-RGO-MWCNT/CuFeO2 composite were identified by different spectroscopic and microscopic measurements. The B-RGO-MWCNT/CuFeO2 composite was structurally well-formed with an active surface area. The GCE electrode decorated with B-RGO-MWCNT/CuFeO2 composite was applied to HER and exhibited an outstanding electrocatalytic response with low over-potential and a small Tafel slope of 54 mV·dec−1 at 10 mA.cm−2 over potential with high stability. Moreover, the small Tafel slope suggests a promising electrocatalyst suitable for practical use. Furthermore, the obtained B-RGO-MWCNT/CuFeO2 electrode was correlated with Pt/C and exhibited superior electrocatalytic performance toward the HER in acidic media. The electrochemical response is credited to the active sites and effective electron transport between CuFeO2 and B-RGO-MWCNT. As a result, the B-RGO-MWCNT/CuFeO2 composite looks to be an effective catalyst for the electrocatalytic reaction of HER and has the potential to produce clean energy.

In this study, CuAlO2/Al2O3 micro-sphere was prepared by sol-gel techniques and annealed under N2-atmosphere. The microsphere composite materials physio-chemical properties were studied using various analytical techniques. The surface morphology prepared materials were observed from the field-emission scanning electron microscopy with spherical structure. The surface area and the surface morphology were explored using the Brunnauer-Emmmett-Teller method. In this research, we studied a CuAlO2/Al2O3 microspheres decorated screen printed carbon electrode (SPCE) utilized to detected the furaltadone (FLT). The electrochemical active surface area has determined using ferric cyanide system and randles-sevick equations. The CuAlO2/Al2O3 microspheres electrochemical ability was analysed using cyclic voltammetry and differential pulse voltammetry towards detection of FLT. These CuAlO2/Al2O3 microspheres decorated electrodes exhibited excellent electrochemical sensor with a limit of detection and sensitivity is 20 nM and 12.7845 μA μM-1 cm-2, respectively. Moreover, the CuAlO2/Al2O3 microspheres/SPCE electrodes exhibit excellent stability, repeatability, reproducibility, and higher sensitivity. The decorated sensor electrode real time applications were successfully studied to analyzing FLT in river and bond water with excellent recovery results.