Fe and Co-doped (Ba, Ca)TiO3 Perovskite as Potential Electrocatalysts for Glutamate Sensing

Abstract

Barium titanate (BaTiO3) and calcium titanate (CaTiO3) are renown perovskitestructured dielectric materials. Nevertheless, utilization of BaTiO3 and CaTiO3 in sensing applications has not been extensive. This study, therefore, aims at examining potential usage of BaTiO3 and CaTiO3 as enzyme-less sensors. BaTiO3, CaTiO3, Fe-doped BaTiO3, Co-doped BaTiO3, Fe-doped CaTiO3, and Co-doped CaTiO3 (with Fe and Co 5 at%) were synthesized by solution combustion technique, compositionally and microstructurally examined, and tested for their electrocatalytic activities. All powders consisted of submicrometer-sized particles. Measurements of electrocatalytic activities in 0.01 M glutamate solution by cyclic voltammetry were performed. It was found that oxidation peaks occurred at applied voltage close to 0.6 V. Peak currents, which denoted electrocatalytic performance, were prominent in doped powders. Electrocatalytic activities of the powders were discussed with respect to chemical composition, microstructure, and electronic characteristics of the materials.

Favoring Product Desorption by a Tailored Electronic Environment of Oxygen Vacancies in SrTiO3 via Cr Doping for Enhanced and Selective Electrocatalytic CO2 to CO Conversion

“…of Ti in XPS confirmed substitutional doping of Cr 3+ for Ti 4+ in STO. This would lead to the creation of more O vac in order to balance the charge or to maintain the electroneutrality in the lattice, according to eq , where Vö depicts the vacancy and Cr’ shows the difference in charges (i.e., with the trivalent Cr 3+ cation in the tetravalent Ti 4+ cation lattice site) …”

Synthesis and Characterization of Fe-Doped CaTiO3 Polyhedra Prepared by Molten NaCl Salt

“…It indicates that Fe doping in uences the growth of CTO grain particles (Huang et al, 2016;Luo et al, 2021). Sato et al (2019) reported that the substitution of Ti 4+ with Fe 3+ with a smaller charge caused an unbalance charge, thus compensated by the reveal of oxygen vacancy. This vacancy detains the ion movement cause decreasing the grain growth and particle size.…”