2020
DOI: 10.1088/1361-6528/aba0f5
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High surface area for La1-xSrxFeO3 (x=0, 0.4, 0.6) as bifunctional catalyst for rechargeable Li-O2 batteries

Abstract: Three-dimensionally mesoporous La 1-x Sr x FeO 3 (x = 0, 0.4, 0.6) precursors have been synthesized through a facile solvothermal process. After high-temperature sintering, La 1-x Sr x FeO 3 still exhibits uniform morphology and good dispersibility, which provides a porous structure and favorable surface area. Particularly, La 0.4 Sr 0.6 FeO 3 shows the biggest surface area of 58 m 2 g −1 . Doping also induces the generation of oxygen vacancies and Fe 4+ , which is beneficial for the conductivity and catalytic… Show more

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Cited by 3 publications
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“…These results suggest that the oxidation and expansion modifications effectively increase the surface area of the composite catalysts, which has been regarded in the literature as beneficial to the catalytic performance. 47,48 Note that unlike other composites, NCO/EMCMB-3h exhibits a distinctly large hysteresis loop of type H2, suggesting a mesoporous structure with more complex and disordered pore networks. 49 Compared with the N 2 adsorption/desorption isotherms of EMCMB-3h in Fig.…”
Section: Resultsmentioning
confidence: 99%
“…These results suggest that the oxidation and expansion modifications effectively increase the surface area of the composite catalysts, which has been regarded in the literature as beneficial to the catalytic performance. 47,48 Note that unlike other composites, NCO/EMCMB-3h exhibits a distinctly large hysteresis loop of type H2, suggesting a mesoporous structure with more complex and disordered pore networks. 49 Compared with the N 2 adsorption/desorption isotherms of EMCMB-3h in Fig.…”
Section: Resultsmentioning
confidence: 99%
“…Perovskite oxides with the chemical formula of ABO 3 (A represents alkaline-earth or rare-earth metal ions and B represents transition metal ions) are a class of promising materials to fulfill the aforementioned requirements for field-assisted, and more specifically here, photoassisted LOBs. Most perovskite oxides are chemically stable, low cost, semiconductive, and structurally tunable at all of the A, B, and O sites, offering a versatile medium to tune the electronic states toward enhanced bifunctionality of ORR and OER, as well as optimized photoresponse for photovoltaics. Previous studies have shown heteroatomic substitution of alkaline-earth metals at the A site and transition metals at the B site enables modulating both the band structure and spin state of perovskite oxides, apart from creating oxygen vacancies for optimized surface and intermediate-binding energetics. Specifically for LaCoO 3 (LCO), it was reported that Co ions with the tailored e g spin state close to 1 give rise to the most desired catalytic activities, since electrons on the e g orbits can interact directly with the ligand oxygen and thereby promote electron transfer between surface active sites and adsorbed intermediates. , Thus, enhanced Co 3d–O 2p covalency is beneficial for boosting the intrinsic electrocatalytic activity of LCO for accelerating oxygen cathode reactions. Specific examples include the partial substitution of La with Sr at the A sites , and substitution of Co with Mn and Fe and at the B sites. However, despite the good electrochemical stability and structural flexibility, the intrinsic catalytic activity and photoactivity of LCO, when deployed as the photocathode catalyst, remain to be further improved.…”
Section: Introductionmentioning
confidence: 99%
“…33,34 Thus, enhanced Co 3d−O 2p covalency is beneficial for boosting the intrinsic electrocatalytic activity of LCO for accelerating oxygen cathode reactions. 35−37 Specific examples include the partial substitution of La with Sr at the A sites 38,39 and substitution of Co with Mn 40 and Fe 41 and at the B sites. However, despite the good electrochemical stability and structural flexibility, the intrinsic catalytic activity and photoactivity of LCO, when deployed as the photocathode catalyst, remain to be further improved.…”
Section: Introductionmentioning
confidence: 99%