Molten Salt Synthesized Submicron Perovskite La1–xSrxCoO3 Particles as Efficient Electrocatalyst for Water Electrolysis

Abstract

Perovskite oxides are an important and effective class of mixed oxides which play a significant role in the fields of energy storage and conversion systems. Here we present a series of cobaltite perovskite LaCoO 3 particles which have been doped with 0, 5, 10, 20, and 30% of Sr 2+ and have been synthesized by a combined solgel and molten-salt synthesis procedure, which provides a regular morphology of the particles. These Sr 2+-doped LaCoO 3 particles have been characterized by powder X-ray diffraction, Raman spectroscopy, infrared spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscopy. Moreover, these Sr 2+ doped LaCoO 3 particles have been demonstrated as efficient catalysts for oxygen evolution reaction (OER) based on the measured specific capacitance, total charge, most accessible charge, electrochemically active surface area, and roughness factor using rotating disk and rotating ring-disk electrode techniques. The 30% Sr 2+-doped LaCoO 3 sample shows enhanced electrocatalytic OER activity in 0.5 M H 2 SO 4 media compared to the LaCoO 3 samples doped with 0, 5, 10, and 20% Sr 2+. Among all five LaCoO 3 samples, the doped LaCoO 3 samples demonstrate better OER activity than the undoped sample.

Self-Assembled Interwoven Nanohierarchitectures of NaNbO3 and NaNb1–xTaxO3 (0.05 ≤ x ≤ 0.20): Synthesis, Structural Characterization, Photocatalytic Applications, and Dielectric Properties

“…The demand for environmentally benign materials for water remediation, energy generation, and storage applications has increased vastly due to the population explosion in last few decades. , Therefore, to meet the challenges due to exponential growing population, different new methods of environment remediation, green energy generation, and storage are being explored. − Among different techniques, photocatalytic remediation of wastewater and photocatalytic production of hydrogen from water splitting has gained prime importance due to being environment friendly and the renewable nature of water. , An important application of photocatalysis is the removal of hazardous organic pollutants from the water. To carry out the photocatalytic water splitting and degradation of organic pollutants from wastewater, different inorganic nanophotocatalysts like metal oxides (NaNbO 3 , NaTaO 3 , TiO 2 , Cu 2 O, Ag, KNbO 3 , La 1– x Sr x CoO 3 , Pr 2 Sn 2 O 7 , holmium oxide), metal tungstites, and molybdates have been used. − The use of diverse inorganic photocatalysts starts from the pioneering work carried out by Fujishima using TiO 2 as a photocatalyst for water splitting . Among different explored photocatalysts, perovskite photocatalysts like NaNbO 3 , NaTaO 3 , KNbO 3 , etc.…”

Piezoelectric properties of PVDF‐conjugated polymer nanofibers

“…Charge storage of our developed systems was calculated using Equation reported by Audichon et al 31 below where v is the scan rate, m is the mass in milligrams of the catalyst deposited on the working electrode, s is the surface area of the working electrode, E 1 and E 2 are limits of potential of the integration curves, and is the integration of the cyclic voltammogram curve. The voltametric charge (q*) was obtained from the cyclic voltammogram 29,30 Figures 3(a) to (e) show the cyclic voltammograms for the PVDF/CP nanofiber systems (PVDF/PANI, PVDF/PANA, PVDF/PIN, PVDF/PPY, and PVDF/PCZ, respectively) and were carried out using 0.5 M H 2 SO 4 as electrolyte at a scan rate of 20 mV/sec.…”

Silver-doped SnO2nanostructures for photocatalytic water splitting and catalytic nitrophenol reduction

“…As a result of the doping, defects can be created in semiconducting oxides, such as trapped states and oxygen vacancies, which effectively inhibit the recombination of electron–hole pairs owing to the capturing of electrons alone, thus improving the performances of metal oxides in photocatalysis. 33–36…”