Synthesis of three-dimensionally ordered macroporous LaFeO3 with enhanced methanol gas sensing properties

Qin, Jian; Cui, Zhenduo; Yang, Xianjin; Zhu, Shengli; Li, Zhaoyang; Liang, Yanqin

doi:10.1016/j.snb.2014.12.046

Cited by 113 publications

(31 citation statements)

References 50 publications

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“…The phase structures of 3DOM‐LF and 3DOM‐LFC82 samples were first analyzed by room‐temperature X‐ray diffraction (XRD) (Figure f). 3DOM‐LF exhibited a pure orthorhombic perovskite structure with a space group of Pnma (JCPDS, No 01‐88‐0641), which is consistent with previous reports . After introducing 20% cobalt into the Fe‐site in 3DOM‐LF, a cubic structure with a space group of Pm‐3m for 3DOM‐LFC82 was formed.…”

supporting

confidence: 89%

Enabling High and Stable Electrocatalytic Activity of Iron‐Based Perovskite Oxides for Water Splitting by Combined Bulk Doping and Morphology Designing

Dai

Zhu

Zhong

et al. 2018

Adv Materials Inter

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COMMUNICATION (1 of 8)scale is mainly hindered by the large overpotential, originated largely from sluggish kinetics of anodic oxygen evolution reaction (OER) and cathodic hydrogen evolution reaction (HER). For commercial electrolyzers, a much higher operating potential (1.8-2.0 V) is always required than the theoretical value (1.23 V). [5] The iridium/ruthenium oxides (IrO 2 /RuO 2 ) and platinum (Pt) metal are recognized as the state-of-the-art catalysts toward anodic and cathodic reactions, respectively, [6] while their large-scale commercial application is restricted by high cost and resource scarcity. [7] Thus, it is necessary to rationally design high-performance, cost-effective, and abundant catalysts for water splitting. So far, diverse groups of materials including oxides, hydroxides, phosphides, chalcogenides, carbides, and nitrides, have been exploited as potential catalysts for water splitting with different benefits and drawbacks. [8,9] Perovskite oxides with the general formula of ABO 3 , where A is alkaline-and/or rare-earth metal and B is a transition metal (most of which is cobalt (Co), nickel (Ni), manganese (Mn), and iron (Fe)), have recently attracted considerable attention in the electrocatalysis field due to their high specific catalytic activity, compositional flexibility, and environmental friendliness. [10,11] From the point of practical applications, iron-based materials are more appealing in the family of perovskite considering that Fe metal is more earth-abundant and cheaper, and less toxic than Co and Ni metals. [12,13] However, Fe-based perovskites always show poor activity and unfavorable durability for OER. [14,15] In particular, the iron-rich perovskites always showed an obvious decrease in activity with time on operation. Refer to the poor activity issue, a few efforts have been devoted to looking for effective strategies (e.g., ion doping, deficiency tuning, and crystal-structure design) to enhance the electrocatalytic activity. [16][17][18][19][20] For example, She et al. reported a systematic study of Sr-doped La 1-x Sr x FeO 3-δ perovskites and found A-site Sr-doping could greatly improve OER activity of parent LaFeO 3 . [16] The OER activity of Fe-based perovskite could also be improved by proper B-site ion doping, e.g., Zr 4+ and Si 4+ . [17,18] Besides the ion doping, Zhu et al. also proposed a strategy for enhancing OER activity by introducing A-site deficiency in LaFeO 3 perovskite. [19] Yagi et al. prepared a quadruple perovskite CaCu 3 Fe 4 O 12 via a high-pressure method, which shows higher OER activity than the simple perovskites. [20] The catalysts for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) are crucial for water splitting technology, and perovskite oxides have received tremendous attention as promising candidates due to the compositional flexibility and rich properties. Here, reported is the successful deployment of cost-effective iron-based perovskites into efficient water splitting catalysts with both high activity and stability by c...

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supporting

confidence: 89%

Enabling High and Stable Electrocatalytic Activity of Iron‐Based Perovskite Oxides for Water Splitting by Combined Bulk Doping and Morphology Designing

Dai

Zhu

Zhong

et al. 2018

Adv Materials Inter

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“…Thee xistence of ad istinct H2 type hysteresis loop at medium P/P 0 (0.2-0.8) andn oc lear adsorption plateau at P/P 0 % 1.0 imply the presence of huge amounts of mesopores and macropores, respectively. [45][46][47][48] As shown in Figure 2b,t he Pt/3DHPC possesses aw ell-developed pore system with detectable sizes from 0.4 and 400 nm. The micropores with sizes of 0.4-2 nm and multiple peaks at 0.62, 0.86, 1.25, 1.46, and 1.76 nm are possibly generated from the carbonization of the RF resol, whereas the mesopores with ab road distribution of 2-50 nm and am aximum peak at 3.7 nm is contributed from the aggregation of cross-linked carbon particles andt he templating functiono fF 127.…”

Section: Introductionmentioning

confidence: 94%

Three‐Dimensionally Hierarchical Pt/C Nanocomposite with Ultra‐High Dispersion of Pt Nanoparticles as a Highly Efficient Catalyst for Chemoselective Cinnamaldehyde Hydrogenation

Fan

et al. 2017

ChemCatChem

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A monolithic carbon‐supported Pt nanocomposite with an interconnected three‐dimensionally hierarchical porous carbon framework and ultra‐high dispersion of Pt nanoparticles (Pt/3DHPC) is synthesized by using an effective “liquid phase impregnation template” strategy. The obtained Pt/3DHPC possesses rich mesoporosity and a low amount of oxygen‐containing functional groups, which notably improve the accessible internal surface area of macropores, number of active Pt sites, and electron transfer ability. When used as a catalyst for the selective cinnamaldehyde (CMA) hydrogenation towards cinnamyl alcohol (CMO), Pt/3DHPC exhibits high CMA conversion (92.7 %) and CMO selectivity (91.1 %) at 1 h reaction time, and the corresponding activity (1553.7 h−1) greatly surpasses not only the single‐sized mesoporous carbon and microporous activated carbon‐supported counterparts but also the previously reported Pt catalysts dispersed on other forms of carbon. Furthermore, Pt/3DHPC can be reused at least fifteen times without pronounced decay owing to the strong interaction between Pt and carbon. The present work demonstrates the validity of multiscale control in carbon‐supported Pt catalysts by overall consideration of the mass transportation, and the accessibility, quantity, and capability of active sites towards chemoselective hydrogenation of CMA, which is expected to be extended to other catalysis‐related processes.

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“…The isotherms of type IV with H3 hysteresis loops are obtained according to the IUPAC classifications. This result indicates that all the samples have porous structure [31]. The amount adsorbed rises very steeply at high relative pressure (p/p 0 > 0.8), suggesting the presence of large mesopores or macropores.…”

Section: Crystal Structure and Morphologymentioning

confidence: 79%

Preparation of efficient visible-light-driven BiOBr/Bi2O3 heterojunction composite with enhanced photocatalytic activities

Wang

Jiao

Lian

et al. 2015

Journal of Alloys and Compounds

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Synthesis of three-dimensionally ordered macroporous LaFeO3 with enhanced methanol gas sensing properties

Cited by 113 publications

References 50 publications

Enabling High and Stable Electrocatalytic Activity of Iron‐Based Perovskite Oxides for Water Splitting by Combined Bulk Doping and Morphology Designing

Enabling High and Stable Electrocatalytic Activity of Iron‐Based Perovskite Oxides for Water Splitting by Combined Bulk Doping and Morphology Designing

Three‐Dimensionally Hierarchical Pt/C Nanocomposite with Ultra‐High Dispersion of Pt Nanoparticles as a Highly Efficient Catalyst for Chemoselective Cinnamaldehyde Hydrogenation

Preparation of efficient visible-light-driven BiOBr/Bi2O3 heterojunction composite with enhanced photocatalytic activities

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