HYBRID EVENT: You can participate in person at Paris, France or Virtually from your home or work.
Mangaka Clara Matoetoe, Speaker at Catalysis Conferences
Cape Peninsula University of Technology, South Africa
Title : Preparation, characterization, and evaluation of electrochemical properties of binary mixed oxides of silica and ceria nanocomposite


comprehensively evaluation of the different binary oxides modified electrodes, with a focus on finding optimal electrochemical properties. This is supported by studying the morphology and structural characteristics of the investigated microstructures. Individual oxide and mixed oxide nanoparticles of SiO, CeO, and SiO-CeO were fabricated on the GCE to study the electron transport properties by using CV, SW, and EIS. Electrochemical kinetics from CV display great comparatively results with large surface area and the smallest Ks and De values of 5.23 x10-3 (V.s-1) and 1.90 x10-6 (cm2 s1) on GCE/SiO-CeONPs, as an indication of fast rate-determining steps and diffusion compared to individual oxides. EIS analysis revealed the highest conductivity in GCE/SiO-CeONPs in terms of Rct showing better electrochemical properties due to its lower values of 3.20 and 2.80 kΩ for porous and compact layers, respectively. Physicochemical studies confirmed the interaction of oxides, revealing that CeONPs were uniformly coated to the surface of SiONPs and possess the core-shell composite particle, whereas SEM results established spherical uniform-shaped nanoparticle sizes of ∼ 12 ± 0.047 nm. A bandgap value of 4.16 eV was estimated from Optical analysis calculated from the band edge of spectra through Tauc plot. Zeta potential resulted in monodispersed stable nanoparticle structure formation. Therefore, based on the electrochemical properties and physicochemical studies observed, the great potential of SiO-CeONPs may be useful and guide us to use for use in many applications.

Audience Takeaway Notes: 

  • Electrochemical properties comparison of the oxides of silica, ceria, and silica ceria nanoparticles of low dimension modified the GCE.
  • Morphological, optical and structural studies of the Synthesised oxides and binary mixed oxides
  • Electro kinetic studies of the binary oxides
  • Potential application of the Synthesised binary oxides in sensors


Prof Mangaka Matoetoe is a C2 NRF rated researcher whose expertise is in electroanalytical techniques. Her research interests are in material electrochemistry focusing on synthesis of metal nanoparticles (metal, metal oxide and bimetallic) and quantum dots (ternary and quaternary porphyrin based) as well as their composites. Application of these materials in sensors of microbial, biomarkers and environmental pollutants. She has graduated over 15 post graduates students (PhD and MSc) She has published in reputable journal of high impact factors.