Crystallization control of SrCO3 nanostructure in imidazolium-based temperature ionic liquids

Li, Lishuo; Lin, Rongyi; Tong, Zhangfa; Feng, Qingge

doi:10.1016/j.materresbull.2012.08.027

Cited by 7 publications

(5 citation statements)

References 35 publications

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“…As is evident, the weight loss up to 100 • C is due to the evaporation of physi/chemisorbed water molecules including 8H 2 O from Sr(OH) 2 • 8H 2 O; 36 the weight loss at around 400 • C is attributed to the dissociation of H 2 O from Sr(OH) 2 ; 36 and the weight loss at >750 • C is caused by the release of CO 2 (g) in the decomposition of SrCO 3 to SrO. 37 Based on the literature pertaining to the stability of perovskite electrodes in SOFC, Sr-segregation is likely to occur when the size mismatch between the host and dopant cations in A-site is large, particularly in (La,Sr)CoO 3 and (La,Sr)(Co,Fe)O 3 . [38][39][40][41] The driving force is regarded as local compressive stress around Sr 2+ owing to its relatively large size (0.144 nm in coordination number of 12).…”

Section: Resultsmentioning

confidence: 99%

H₂O Absorption Assisted Sr-Segregation in Strontium Nickel Oxide Based Chromium Getter and Encapsulation with SrCO₃

Hong

Heo

Aphale

et al. 2019

J. Electrochem. Soc.

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Chromium getters composed of strontium nickel oxide (Sr 9 Ni 7 O 21 ) offer a cost-effective pathway for the mitigation of cathode poisoning in solid oxide fuel cells by capturing gaseous chromium species. The getter material, however, remains prone to chemical and structural changes in humid environments. Experimental observations indicate that Sr is segregated by absorbing H 2 O molecules and the resulting Sr-deficient phase is transformed into SrNiO 3 . Investigations reveal that the Sr-segregation is attributed not only to the hygroscopic nature of Sr but also to the compressive stress and 1D arrangement of Sr-ions in the structure. The formation of Sr(OH) 2 • 8H 2 O by moisture absorption accompanies volume expansion, resulting in crack formation. To improve the resistance to moisture attack, the surface is modified with SrCO 3 layer by CO 2 -treatment. Experimental observations confirm that the SrCO 3 passivation layer effectively restrains the moisture absorption and accompanied structural changes. The Cr-gettering capability of the SrCO 3 layer on strontium nickel oxide is experimentally and thermodynamically verified.

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Section: Resultsmentioning

confidence: 99%

H₂O Absorption Assisted Sr-Segregation in Strontium Nickel Oxide Based Chromium Getter and Encapsulation with SrCO₃

Hong

Heo

Aphale

et al. 2019

J. Electrochem. Soc.

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“…Researchers intend to explore this problem from different perspectives [ 120 , 121 ]. Li et al deeply discussed the relationship between Ils and crystal nucleation kinetics, proving that Ils can affect crystal nucleation [ 122 , 123 ]. Wegner et al tried to summarize the research on the interdependence between Ils and metal nanoparticles [ 124 ].…”

Section: Discussionmentioning

confidence: 99%

Ionic Liquids as Promisingly Multi-Functional Participants for Electrocatalyst of Water Splitting: A Review

Zhang

Qian

et al. 2023

Molecules

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Ionic liquids (ILs), as one of the most concerned functional materials in recent decades, have opened up active perspectives for electrocatalysis. In catalyst preparation, ILs act as characteristic active components besides media and templates. Compared with catalysts obtained using ordinary reagents, IL-derived catalysts have a special structure and catalytic performance due to the influence of IL’s special physicochemical properties and structures. This review mainly describes the use of ILs as modifiers and reaction reagents to prepare electrocatalysts for water splitting. The designability of ILs provides opportunities for the ingenious composition of cations or anions. ILs containing heteroatoms (N, O, S, P, etc.) and transition metal anion (FeCl4−, NiCl3−, etc.) can be used to directly prepare metal phosphides, sulfides, carbides and nitrides, and so forth. The special physicochemical properties and supramolecular structures of ILs can provide growth conditions for catalysts that are different from the normal media environment, inducing special structure and high performance. ILs as heteroatom sources are safe, green and easy to operate compared with traditional heteroatom sources. The strategy for using ILs as reagents is expected to realize 100% atomic transformation of reactants, in line with the concept of green chemistry. This review reflects the discovered work with the best findings from the literature. It will offer readers a deeper understanding on the development of IL-derived electrocatalysts and inspire them to ingeniously design high-performance electrocatalysts for water splitting.

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“…Reductive calcination followed by Na 2 CO 3 (aq) assisted precipitation (the black ash method) -- [26] Celetine ore (SrSO 4 ) (industrial scale) Double decomposition in Na 2 CO 3 (aq) -- [27] Sr(OH) 2 + CO 2 + EDTA 50 • C, 10 min spherical shape - [28] Sr ( [35] This work investigated the effects of precursor concentrations (Sr:ethanol mole ratios), solvothermal temperatures and treatment times on the properties of SrCO 3 materials and their photocatalytic degradation of MB in water under visible light irradiation, as a function of pH and temperature. Kinetic and mechanistic studies of the MB degradation process were carried out through reaction rate determination and identification of the end-products.…”

Section: Conditions Reaction Time Morphology Band Gap Referencesmentioning

confidence: 99%

Visible Light Responsive Strontium Carbonate Catalyst Derived from Solvothermal Synthesis

2020

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A single crystalline phase of strontium carbonate (SrCO3) was successfully obtained from solvothermal treatments of hydrated strontium hydroxide in ethanol (EtOH) at 100 °C for 2 h, using specific Sr:EtOH mole ratios of 1:18 or 1:23. Other solvothermal treatment times (0.5, 1.0 and 3 h), temperatures (80 and 150 °C) and different Sr:EtOH mole ratios (1:13 and 1:27) led to formation of mixed phases of Sr-containing products, SrCO3 and Sr(OH)2 xH2O. The obtained products (denoted as 1:18 SrCO3 and 1:23 SrCO3), containing a single phase of SrCO3, were further characterized in comparison with commercial SrCO3, and each SrCO3 material was employed as a photocatalyst for the degradation of methylene blue (MB) in water under visible light irradiation. Only the 1:23 SrCO3 sample is visible light responsive (Eg = 2.62 eV), possibly due to the presence of ethanol in the structure, as detected by thermogravimetric analysis. On the other hand, the band gap of 1:18 SrCO3 and commercial SrCO3 are 4.63 and 3.25 eV, respectively, and both samples are UV responsive. The highest decolourisation efficiency of MB solutions was achieved using the 1:23 SrCO3 catalyst, likely due to its narrow bandgap. The variation in colour removal results in the dark and under visible light irradiation, with radical scavenging tests, suggests that the high decolourisation efficiency was mainly due to a generated hydroxyl-radical-related reaction pathway. Possible degradation products from MB oxidation under visible light illumination in the presence of SrCO3 are aromatic sulfonic acids, dimethylamine and phenol, as implied by MS direct injection measurements. Key findings from this work could give more insight into alternative synthesis routes to tailor the bandgap of SrCO3 materials and possible further development of cocatalysts and composites for environmental applications.

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Crystallization control of SrCO3 nanostructure in imidazolium-based temperature ionic liquids

Cited by 7 publications

References 35 publications

H₂O Absorption Assisted Sr-Segregation in Strontium Nickel Oxide Based Chromium Getter and Encapsulation with SrCO₃

H₂O Absorption Assisted Sr-Segregation in Strontium Nickel Oxide Based Chromium Getter and Encapsulation with SrCO₃

Ionic Liquids as Promisingly Multi-Functional Participants for Electrocatalyst of Water Splitting: A Review

Visible Light Responsive Strontium Carbonate Catalyst Derived from Solvothermal Synthesis

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Crystallization control of SrCO3 nanostructure in imidazolium-based temperature ionic liquids

Cited by 7 publications

References 35 publications

H2O Absorption Assisted Sr-Segregation in Strontium Nickel Oxide Based Chromium Getter and Encapsulation with SrCO3

H2O Absorption Assisted Sr-Segregation in Strontium Nickel Oxide Based Chromium Getter and Encapsulation with SrCO3

Ionic Liquids as Promisingly Multi-Functional Participants for Electrocatalyst of Water Splitting: A Review

Visible Light Responsive Strontium Carbonate Catalyst Derived from Solvothermal Synthesis

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H₂O Absorption Assisted Sr-Segregation in Strontium Nickel Oxide Based Chromium Getter and Encapsulation with SrCO₃

H₂O Absorption Assisted Sr-Segregation in Strontium Nickel Oxide Based Chromium Getter and Encapsulation with SrCO₃