CHEMISTRY OF MATERIALS
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2025
·
IF 7
Henglong Li,Pengheng Li,Min Lin,Xing Zhu
The design of oxygen carriers is essential for the chemical looping partial oxidation of methane (CL-POM) in syngas production. LaFeO3 is a promising oxygen storage material, but the impact of its morphology on the reaction characteristics and mechanisms in CL-POM remains unclear. Herein, we synthesized and characterized LaFeO3 samples with diverse morphologies (cube, porous microsphere, irregular nanoparticle, and polyhedron) to explore how morphology governs crystal plane exposure, oxygen vacancy formation, and oxygen migration. Results showed that cubic LaFeO3 not only achieved outstanding oxygen storage capacity (4.18 mmol/g), 2.5 times that of the other three samples combined (1.64 mmol/g), but also demonstrated superior methane reactivity with good low-temperature activity (initial reaction temperature of 500 °C) and the highest methane conversion (78.26% at 750 °C). This impressive performance is due to the synergy between oxygen vacancies and the (110) crystal plane, which optimizes oxygen release and enhances methane adsorption and dissociation. DFT calculations further confirmed that the (110) plane has lower energy barriers for reaction processes than the (100) plane, and more oxygen vacancies enhance reactivity and oxygen migration. This work underscores the pivotal role of LaFeO3 morphology in advancing the design of oxygen storage materials and a redox catalyst.
研究领域:
材料科学
·
能源化学
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产品关联
DOI
高影响因子
PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES
·
2024
·Vol. 23
·期 9
·1659-1672
·
IF 2.7
Zhang Lihua,Dong Guowen,Liu Xiaomin,Niu Yu,Gao Wei,Yang Qiong,Li Zaixing
The catalysts with three-dimensional porous (3DP) CeO 2 , LaFeO 3 and SrTiO 3 are synthesized by sol–gel method and chemical precipitation method. The resulting multi-component 3DP CeO 2 /LaFeO 3 /SrTiO 3 composite material featured a high specific surface area (26.08 m 2 /g), which can provide more surface active sites to improve adsorption capacity and catalytic performance. The photocatalytic, Fenton-like, photo-Fenton-like performance of the catalyst are studied on decolorization of RhB under UV irradiation, respectively. 3DP CeO 2 /LaFeO 3 /SrTiO 3 exhibits high catalytic performance. Compared with photocatalytic or Fenton-like performance, 3DP CeO 2 /LaFeO 3 /SrTiO 3 catalyst exhibits higher photo-Fenton-like performance, facilitating efficient decolorization of the rhodamine B. Moreover, the initial reaction rate on decolorization of RhB with 3DP CeO 2 /LaFeO 3 /SrTiO 3 is 10.55, 5.52, 3.67 and 1.51 times higher than that with SrTiO 3 , LaFeO 3 , 3DP CeO 2 and 3DP CeO 2 /LaFeO 3 , respectively. Meanwhile, 3DP LaFeO 3 /CeO 2 /SrTiO 3 has a wider pH usage range in the synergistic reaction. Finally, a catalytic mechanism for the decolorization of rhodamine B is proposed. The continuous cycling of Fe 3+ /Fe 2+ and Ce 4+ /Ce 3+ and the production of active substances are achieved under the photo-Fenton-like effect of the catalyst. Graphical abstract
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Jinyong Hu,Xiqi Chen,Yong Zhang
High-performance formaldehyde sensors act a significant role in environmental monitoring and industrial gas analysis. However, the traditional side-heating type gas sensors fabricated by handicraft-like brush-painting or drop-casting methods still suffer from poor detection limits and the difficulty of massive fabrication, which hinders the further practical applications of gas-sensing devices. Herein, the uniform LaFeO 3 thin film prepared through a facile sol-gel method combining with spin coating is proposed to achieve batch-fabricated gas sensors for the detection of gaseous formaldehyde. The fabricated gas sensor exhibits a low detection limit as low as 50 ppb toward gaseous formaldehyde, which is lower than the guideline value (80 ppb) limited by World Health Organization. Furthermore, the gas-sensing properties of batch-fabricated thin film gas sensors reveal satisfactory uniformity and replicability with low device-to-device deviation. The maximum variation of baseline resistance between different batch samples is only 5.4%, and the maximum drift of the response value toward formaldehyde is only 6.5%. The favorable gas-sensing performances and high replicability for the sensors might be attributed to the controllable fabrication process that can be completely compatible with the well-established semiconductor technics. This work will open up an effective pathway to prompt high-performance formaldehyde sensors with ppb-level detection limits toward practical applications.
研究领域:
材料科学
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环境监测
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半导体技术
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Boyan Fu,Leyao Bi,Jiahui Lin,Jiaxing Fu,Junsheng Wen,Binglin Zou,Chunjie Wang,Yue Wang
ABO 3 -type gas sensors for ethanol gas-sensing remain a significant challenge. In this paper, porous microspheres of La 0.9 Fe 1-x Co x O 3 (x = 0, 0.05, 0.1, 0.15, 0.2) were synthesized via a ultrasonic-assisted hydrothermal method. The materials were characterized with various techniques to determine their phase structures, morphologies, electrochemical properties, and sensing abilities. For all investigated sensors, La 0.9 Fe 0.85 Co 0.15 O 3 exhibited a response value of 50.445 for 100 ppm ethanol gas at 200 °C (RH = 35 %), which is over eight times higher than that of LaFeO 3 under the same conditions. In addition to its high response to ethanol, La 0.9 Fe 0.85 Co 0.15 O 3 has excellent selectivity, humidity resistance (35–95 % RH), and a fast response/recovery time (18/9 s). Further analyses demonstrate that the synergistic effect of A-site cation defects and Co-doping plays a pivotal role in enhancing sensing performance by effectively increasing oxygen vacancy content and adsorption energy. This work presents an effective approach for developing high-performance ethanol gas sensors based on LaFeO 3 .
研究领域:
材料科学
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化学传感
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纳米技术
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2025
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IF 21.1
Pingzhen Li,Changlong Zheng,Zhen Zhang,Wei Liu,Xiaodong Wu,Shuang Liu
Due to the difficulty of integrating platinum into the perovskite lattice, it is yet challenging to build robust Pt catalysts through the “exsolution” strategy. In this article, we showed that by simply inserting a 500 ℃ holding period in the calcination process of a precursor that obtained via citric acid-assisted sol-gel methods, a homogeneous Pt-incorporated LaFeO 3 perovskite could be synthesized. Further characterizations evidenced that a La 4 PtO 7 phase, probably derived from the reactions among Pt ensembles, gaseous O 2 , crystallized La 2 O 2 CO 3 and La(OH) 3 , played a key role in preserving the platinum in a “dissolved” state during perovskite crystallization. Based on this perovskite system, an “intelligent catalyst” with well-dispersed exsolved Pt nanoparticles and relatively large surface area was produced, which was not only highly reactive for the complete oxidation of C 3 H 6 and CO, but also immune to the sintering effects induced by aging treatments. The above observations provide a typical example on how the slight changes in synthesis significantly influence the structure-property relationship of the catalysts obtained via exsolution methods, and how to utilize these knobs to obtain practical catalysts.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
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IF 5.1
Jiayu Zhan,Liping Liang,Ying Lu,Shanping Jiang,Gunel Imanova,Sridhar Komarneni,Jianfeng Ma
An efficient and stable LaFeO 3 @CoS Z-scheme heterojunction photocatalyst was prepared through the hydrothermal method (HT). Photocatalytic activity of the LaFeO 3 @CoS was assessed by activating persulfate under visible light for the degradation of tetracycline (0.1 g/L). Under the condition of 0.06 g/L of KHSO 5 (Peroxymonosulfate, PMS), the degradation efficiency of 88.7 % was achieved in 40 min using the 0.02 g/L of developed photocatalyst. The degradation kinetic constants of LaFeO 3 @CoS were 2.79 and 2.23 times higher than those of LaFeO 3 and CoS, respectively. Furthermore, the catalyst exhibited excellent stability over five consecutive degradation cycles. Possible degradation mechanisms and the electron transfer mechanism of the heterojunction formed by the LaFeO 3 @CoS were investigated by quenching experiments, nitrogen N₂ purging experiments, electron spin resonance (ESR) measurements and corresponding electrochemical analyses. In the LaFeO 3 @CoS/Vis/PMS system, the Z-scheme charge transfer pathway not only accelerated charge transport efficiency but also effectively spatially separated electrons and holes, enhancing the photocatalytic performance of the photocatalyst. Additionally, the generation of reactive species such as 1 O 2 , O 2 • − , and SO 4 • − significantly contributed to the improved degradation efficiency of the present catalyst during the degradation process.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
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2023
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IF 3.8
Hadeel A. Khayoon,Mohammed Ismael,Abbas Al-nayili,Hassan A. Alshamsi
LaFeO 3 -nitrogen deficient g-C 3 N 4 (LaFeO 3 -g-C 3 N 4 -H) heterostructure has been fabricated obtaining thermal polymerization of acetic acid-treated melamine followed by incorporation of perovskite-type LaFeO 3 onto the graphitic carbon nitride nanosheets (g-C 3 N 4 ) using La(NO 3 ) 3 ·6H 2 O and Fe(NO 3 ) 3 ·9H 2 O as precursors. The as-synthesized nanocomposite was investigated using Fourier Transform Infrared Spectroscopy (FT-IR), powder X-ray diffraction (XRD), UV–Vis Diffuse Reflection Spectroscopy (UV–Vis DRS), Scanning Electron microscope (SEM), and Transmission Electron microscope (TEM). The findings of the characterization study revealed the successful incorporation of LaFeO 3 on g-C 3 N 4 -H nanosheets. The band gap energy of LaFeO 3 -g-C 3 N 4 -H heterojunctions was found to be active in the visible light region. The LaFeO 3 -g-C 3 N 4 -H ability to degrade Rhodamine B (RhB) dye in an aqueous solution was investigated under sunlight illumination. The results of photocatalytic degradation activity showed that LaFeO 3 -g-C 3 N 4 -H photocatalyst has presented the highest photocatalytic efficiency of 99.5% after 60 min under sunlight irradiation. The remarkable photocatalytic activity can be attributed to the defect structure of g-C 3 N 4 and the construction of heterojunction. In addition, LaFeO 3 -g-C 3 N 4 -H showed promise recyclability after 5 cycles with slight activity reduction.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Zhenwu Zhong,Xiaoyu Yang,Zhaoxiang Qi,Ke Zhao,Salman Riaz,Ying Qi,Peng Wei,Min Jae Ko,Jian Cheng,Yahong Xie
Carbon-based MAPbI 3 perovskite solar cells (C-PSCs) have attracted significant attention due to their low cost and stable performance. However, due to inherent structural defects and an energy level mismatch between the perovskite layer and the carbon electrode, C-PSCs still show a poorer power conversion efficiency (PCE) than traditional perovskite solar cells (PSCs). In this study, LaFeO 3 @C nanocomposite particles were successfully synthesized via pyrolysis of La-containing MIL-100(Fe) MOF gel. By introducing these pre-synthesized LaFeO 3 @C bimetallic composite oxide nanoparticles into the carbon electrode, the device featuring a FTO/SnO 2 /CH 3 NH 3 PbI 3 /LaFeO 3 @C/C architecture achieved an impressive maximum PCE of 16.35%, surpassing that of the pristine device by 9.36%. The enhanced optoelectronic performance can be primarily attributed to enhanced interfacial contacts, superior interfacial charge extraction ability, and better electrical conductivity . The LaFeO 3 @C-based device maintained more than 90% of the initial PCE after being stored for 31 days at room temperature and ambient humidity. This study provides a novel strategy for the preparation of efficient and stable C-PSCs from the perspective of spatial structure regulation of bimetallic MOF-based composites.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2023
·
IF 6.1
Lulu Guo,Shushu Zhao,Guimao Yang,Lifeng Gao,Yanhong Wu,Xuguang Zhang
Perovskite oxide semiconductors have attracted tremendous interest in gas sensing due to their promising properties of tunable active sites, excellent catalytic ability and good structural stability. Nevertheless, the rapid synthesis of perovskite oxides and controlled regulation of their surface oxygen vacancies remains a great challenge. Herein, we report a novel metal–organic frameworks (MOFs) self-template strategy for the rapid and large-scale preparation of LaFeO 3 nanoparticles (M−LaFeO 3 ) with abundant oxygen vacancies. Benefit from the introduction of oxygen vacancies, the resultant M−LaFeO 3 gas sensor exhibit excellent formaldehyde (HCHO) sensing performance at a low operating temperature of 160 °C, including high sensitivity (R g /R a = 8.9 @ 100 ppm), fast response/recovery rate (53 s/32 s), low detection limit (1 ppm) and excellent selectivity. Comprehensive density functional theory (DFT) calculation and spectral characterizations reveal that oxygen vacancies play a vital role in promoting the adsorption and activation of O 2 and HCHO molecules, and accelerate the chemical reaction on the sensing materials surface. Most importantly, it proves the promising application of M−LaFeO 3 sensor in food safety assessment. This work not only provides a simple strategy for constructing oxygen vacancies enriched LaFeO 3 , but also demonstrates the application potential of LaFeO 3 -based gas sensors in the field of formaldehyde detection.
研究领域:
材料科学
·
化学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Da Xu,Feng Sun,Hong Shao,Feng Liu,Qianli Ma,Wensheng Yu,Feng Li,Xiangting Dong
Metal oxide semiconductors (MOSs) are widely utilized in the gas-sensing field owing to their superior gas sensing performances. Herein, a hierarchical nanostructure consisting of Bi 2 MoO 6 nanosheets (NSs) assembled on LaFeO 3 nanofibers (NFs) was successfully synthesized by combining an electrospinning with a solvothermal method . The full study of the sensing performances was conducted by manufacturing commercial gas sensors based on Bi 2 MoO 6 /LaFeO 3 hierarchical nanostructure in order to showcase its potential application in gas sensing. The results show that the sensor based on Bi 2 MoO 6 /LaFeO 3 hierarchical nanostructure exhibits excellent HCHO gas sensing performances including a high response (R a /R g = 36.5), a superior selectivity and a short recovery time (τ rec = 20 s). Additionally, sensors based on Bi 2 MoO 6 NSs and LaFeO 3 NFs were also respectively fabricated to measure HCHO gas sensing performances in order to elucidate the sensing mechanism and structural superiority of the Bi 2 MoO 6 /LaFeO 3 hierarchical nanostructure. The increased capability of detecting HCHO gas can be attributed to the n-p heterostructure formed within the Bi 2 MoO 6 /LaFeO 3 hierarchical nanostructure. The findings in this work can contribute to the realization to enhance the sensing performances by designing n-p heterostructure in gas sensing material.
研究领域:
材料科学
·
传感器技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2023
·Vol. 25
·期 3
·1179-1190
·
IF 9.8
Yaohong Zhou,Wanming Xiong,Yujing Jin,Peng Wang,Weiqi Wei,Jiliang Ma,Xiaohua Zhang
Conversion of lignin feedstocks into aromatic chemicals is a highly desirable target for biorefineries, and their depolymerization often requires high temperatures and harsh conditions. In this work, a process optimization involving several factors, including catalyst dosage, reaction temperature, reaction time, oxygen pressure and solvent effect, towards vanillin production from the oxidation of lignin-based vanillyl alcohol in a base-free solvent over a LaFeO3 perovskite was proposed. The results pronounced that the LaFeO3 perovskite exhibited excellent catalytic performance for affording a 100.0% conversion rate of vanillyl alcohol and 33.0% vanillin yield with the addition of 0.1 g LaFeO3 dosage at 180 °C for 2 h under 1.0 MPa O2 supply in ethyl acetate solvent. Furthermore, the presence of oxygen vacancies (Fe3+–□–Fe2+) in the LaFeO3 perovskite contributed to combining with molecular oxygen to generate the active species [Fe3+O2−], which played a key role in the oxidation of vanillyl alcohol and dominated the formation pathway of vanillin. On the other hand, reusability tests manifested that the performance of LaFeO3 decreased gradually with the increase of consecutive runs and was strongly negatively related to the amount of carbon deposits, as carbon deposits would prevent vanillyl alcohol from being accessible to active sites. Nevertheless, the performance of the spent LaFeO3 catalyst could be easily regenerated by a simple calcination approach. Overall, this work provides the possibility of a scalable strategy for constructing LaFeO3-based perovskites as efficient and reusable catalysts for vanillin production from biorefinery lignin.
研究领域:
化学工程
·
生物炼制
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 8
·1163
·
IF 4.034
Xi-Tao Yin,Davoud Dastan,Fa-Yu Wu,Jing Li
Here SnO2/LaFeO3−XNXcomposite was fabricated using a wet chemical method and was applied to pollutants degradation and gas sensing for the first time. The composite exhibits high performance for photocatalytic degradation of Rhodamine B (RhB) dye and selectivity sensing of various gases. On the basis of the completed experiments, the improved RhB degradation and selective gas sensing performance resulted from the extended optical absorption via N2incorporated surface states and enhanced charge separation via coupling SnO2. Using the scavengers trapping experiments, the superoxide radical (O2•−) was investigated as the major scavenger involved in the degradation of RhB over SnO2/LaFeO3−XNXcomposite. In this paper, the probable reaction steps involved in the RhB dye degradation over SnO2/LaFeO3−XNXcomposite are proposed. This work will provide reasonable strategies to fabricate LaFeO3-based proficient and stable catalysts for environmental purification. In addition, the result of the selectivity of gas performance is also presented.Keywords:LaFeO3−XNX;RhB degradation;charge separation;gas sensing
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）