Effect of morphology on the oxygen evolution reaction for La_0.8Sr_0.2Co_0.2Fe_0.8O_3−δelectrochemical catalyst in alkaline media

Abstract

A series of perovskite oxides La0.8Sr0.2Co0.2Fe0.8O3−δwith different morphologies have been synthesized as oxygen evolution reaction electrocatalysts by an electrospinning technique.

Functional Role of Fe-Doping in Co-Based Perovskite Oxide Catalysts for Oxygen Evolution Reaction

“…[38][39] Yet, even for a low temperature application (< 100 ℃), such as water splitting reaction, the presence of Fe in the B-site of perovskite oxides has shown favorable effects on its activity and stability. 1,[40][41][42][43][44][45][46] In this regard, some studies [40][41][42][43][44][45][46] have been carried out to understand the synergetic effect of Fe-doping in perovskite oxides; still, the explicit role of Fe is yet to be unraveled. Therefore at this stage, gaining thorough understandings of the role of Fe-doping in perovskite catalyst is vital for the future development of OER catalysts.…”

Recent Advances in Novel Nanostructuring Methods of Perovskite Electrocatalysts for Energy‐Related Applications

“…SEM images of electrospun La 0.8 Sr 0.2 Co 0.2 Fe 0.8 O 3− δ fabricated using different nitrate concentrations in the precursor solution, b) 10 wt% (nanofibers), c) 20 wt% (nanorods), and d) 30 wt% (nanoparticles). Reproduced with permission . Copyright 2016, Royal Society of Chemistry.…”

“…The properties of the as‐prepared perovskite nanostructures are dependent on many factors, such as the composition, conductivity, viscosity, and surface tension of the precursor solution, the feeding rate, the applied voltage, the distance between the collector and the needle tip, environmental temperature, and relative humidity during the electrospinning, and the heating rate, calcination atmosphere, temperature, and duration for the annealing process. For example, by adjusting the weight percentage of the nitrates in the precursor solution, Wang et al achieved the morphology‐controlled synthesis of La 0.8 Sr 0.2 Co 0.2 Fe 0.8 O 3− δ perovskite oxide . As shown in Figure b, when the nitrate concentration is at 10 wt%, the as‐obtained perovskite exhibited the formation of porous 1D nanofibers, which transformed into short nanorods at a nitrate concentration of 20 wt% (Figure c), and broken and transformed into nanoparticles with the further increase of nitrate concentration to 30 wt% (Figure d).…”

“…Electrospinning : As an advanced technique for making perovskite nanostructures, electrospinning is known not only for its simplicity and low cost, but more importantly for its controllability in making perovskites with the ideal composition, size, and shape toward the target application. For instance, to achieve best performance in water oxidation electrocatalysis, Wang et al regulated the quantity of precursory nitrates used in electrospinning and obtained La 0.8 Sr 0.2 Co 0.2 Fe 0.8 O 3− δ nanofibers which showed superior OER activity to La 0.8 Sr 0.2 Co 0.2 Fe 0.8 O 3− δ nanorods and nanoparticles . This controlled synthesis can be extended to more complex structures, for example, double perovskites.…”

Electrospun Inorganic Nanofibers for Oxygen Electrocatalysis: Design, Fabrication, and Progress

“…And the morphology and hierarchical porous structure of the perovskites oxides obtained from electrospinning were carefully investigated. [231,232] Besides, Bu et al [233] reported a high-performance and robust cation ordered mesoporous PrBa 0.5 Sr 0.5 Co 2 − x Fe x O 5 +δ nanofiber (PBSCF-NF) via electrospinning technique. PBSCF-NF displays much better www.advancedsciencenews.com OER/ORR performance than its bulk particle and BSCF perovskite, which may originate from the synergistic effects between mesoporous nanofiber structure, high electrical conductivity, well-controlled B-site metal ratio, and structural durability (Figure 14h).…”