SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Changlin Xiao,Zhuang Zhuang Ma,Xiaotong Gao,Peijin Zou,Lichao Jia
LaFeO 3 has been widely investigated as formaldehyde sensing material due to its enhanced performance. However, several disadvantages including the response/recovery speed, selectivity, and detection limit mortally restrict its practical applications. Along these lines, herein, platinum (Pt) functionalized LaFeO 3 porous structures were synthesized to optimize the sensing properties. The sensing test revealed that the best response value of Pt functionalized LaFeO 3 was around 2.5 times over that of the pristine material at the operating temperature of 125 o C. Meanwhile, the sensor also possessed the merits of shorter response/recovery time, better selectivity, and lower detection limits. From our analysis, it was demonstrated that the abundant pore structure and the increased adsorbed oxygen level are responsible for the excellent formaldehyde monitoring properties. Our work paves the way for the development of novel Pt functionalized LaFeO 3 porous structures, which can serve as a potential candidate for formaldehyde detection in many practical applications.
研究领域:
材料科学
·
传感器技术
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Changlin Xiao,Zihuan Tang,Zhuangzhuang Ma,Xiaotong Gao,Hongqiang Wang,Lichao Jia
Metal oxides based semiconductors promise high performance gas sensing owing to their robustness and low cost, but are limited by their unsatisfied adsorption ability and intrinsic low carriers' mobility. We herein demonstrate an efficient strategy of reducing the adsorption energy and improving the carrier mobility via bulk implanted TiO 2 nanocrystals (NCs) in LaFeO 3 porous structure . By implanting laser generated sub-3 nm TiO 2 NCs in LaFeO 3 samples, the response value (221.8 for 100 ppm formaldehyde) increases about 4 times comparing with that of pristine. Additionally, the sample exhibits high sensitivity and fast response/recovery speed toward formaldehyde steam. The detailed analyses and theoretical calculation proves that the TiO 2 NCs could cause the increase of adsorbed oxygen levels as well as the carrier mobility through forming the heterojunction with LaFeO 3 . This work verifies that TiO 2 NCs implanted LaFeO 3 is a promising formaldehyde sensing material, which provides a new approach to improve sensing ability of metal oxide semiconductor (MOS) based gas sensors.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2025
·
IF 4.6
Feng Hu,Jing Li,Xiaoling Peng,Shan Tao,Jingcai Xu,Bo Hong,Xinqing Wang
In this study, the novel Co/C/LaFeO 3 composites were synthesized by in-situ growth of LaFeO 3 on Co/C derived from ZIF-67. The electromagnetic wave (EMW) absorption performance of the Co/C/LaFeO 3 composites was investigated with varying proportions of Co/C and LaFeO 3 . When the weight ration of Co/C to LaFeO 3 was 2:1, the Co/C/LaFeO 3 composites exhibited a remarkable minimum reflection loss (RL min ) of −57.8 dB and demonstrated an effectively absorbing broadband (EAB, RL min ≤ -10 dB) of 5.12 GHz at 1.7 mm. Benefiting from the combined impact of Co nanoparticles, carbon layer, and LaFeO 3 , diverse interfaces and conductive networks were formed, and optimized impedance matching was obtained. In addition, the incorporation of LaFeO 3 significantly enriched the electromagnetic loss mechanisms, ultimately enhancing the comprehensive EMW absorption efficiency of the Co/C/LaFeO 3 composites. This research serves as an essential guide for designing and synthesizing MOF-derived carbon composites with significant EMW absorption capacities.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Haiwen Xu,Danyang Li,Lei Jiang,Chunqiang Lu,Jiangyong Yuan,Zhiqiang Li,Yuelun Li,Huicong Zuo,Kongzhai Li
It is challenging to load precious metals nanoparticles on LaFeO 3 perovskite with small specific surface, and to improve the thermal stability of precious metals is also very difficult. Therefore, it is of great significance to disperse precious uniformly on perovskite with low specific surface area and to make the catalyst with high catalytic activity and thermal stability. In this work, we develop series of perovskite-based methane combustion catalysts with good catalytic activity and stability. Compare with traditional LaFeO 3 catalysts, the catalytic activity of three-dimensional ordered macroporous (3DOM) LaFeO 3 significantly improves by loading Pt. In addition, its thermal stability is significantly improved by adding CeO 2 , especially at high roasting temperature (800 °C). The 1 wt%Pt/10 %CeO 2 /3DOM LaFeO 3 catalysts shows the highest catalytic activity in which the T 10 , T 50 and T 90 are 362 °C, 433 °C and 502 °C, and its recaction temperature of T 50 is decreased by 50 °C compare with Pt/3DOM LaFeO 3 (8 0 0). The different physical and chemical characterizations suggest that the coupling of Ce 3+ and Fe 2+ induces the formation of a large number of oxygen vacancies, which promotes the oxygen mobility and th oxygen storage capacity during the methane oxidation process. More importantly, the CeO 2 addition contributes to the Pt-CeO 2 interaction with Ce-O-Pt bond formation, which greatly improves the thermal stability of the catalyst, and this Pt-CeO 2 interaction strength becomes more obvious with the increase of calcination temperature. Furthermore, the in-situ DRIFT experiments indicate that M−K mechanism is probably involved in the reaction process.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 72
·45369-45376
·
IF 3.108
Ke Xu,Jian Feng
New types of LaFeO3/g-C3N4 heterostructures were successfully prepared and the enhanced photocatalytic hydrogen evolution and degradation activities under visible light irradiation were determined. They possessed the features of a Z-scheme photocatalysis system. The photoexcited electrons on the conduction band of LaFeO3 were transferred to the valence band of g-C3N4 by the solid–solid intimately contacted interfaces, where the electrons and holes were recombined, and thus improved the separation of photogenerated electrons and holes of g-C3N4. The LaFeO3/g-C3N4 heterostructures showed a higher hydrogen evolution rate and a higher amount of ˙OH than pure LaFeO3 and g-C3N4. The construction of the LaFeO3/g-C3N4 heterostructures was used to demonstrate an effective strategy for improving the photocatalytic property. The 5%-LaFeO3/g-C3N4 exhibited the highest photodegradation and water splitting rate. More than 95% of methylene blue (MB) was degraded after 15 min in the presence of 25 mg EDTA-2Na in 100 mL MB solution which was irradiated using a 3 W light-emitting diode. The 5%-LaFeO3/g-C3N4 heterojunction nanocomposite had a maximum hydrogen evolution rate of 158 μmol g−1 h−1.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2018
·
IF 2.873
Mingpeng Chen,Dongming Zhang,Jicu Hu,Huapeng Wang,Yumin Zhang,Kejin Li,Qian Rong,Shiqiang Zhou,Jin Zhang,Zhongqi Zhu,Qingju Liu
Highly sensitive and selective detection against toluene gas remains a tremendous challenge in gas sensor applications . In this work, a series of molecular imprinted Ag-LaFeO 3 nanoparticles (IAL NPs) were synthesized in a microwave-assisted colloidal route. Especially, the one prepared with optimal amount of imprint molecules (IAL-2 NPs) have a response of 24.0 to 5 ppm toluene at the optimum working temperature of 215 °C with negligible responses to the other test gases, exhibiting enhanced gas sensing properties for toluene gas at a relatively low working temperature. The improved performance can be attributed to the favorable effect of microwave radiation, the molecular imprinting structure and the sensitization of Ag, which illuminates that IAL-2 NPs is a potential candidate for toluene detection.
研究领域:
材料科学
·
化学传感器
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THERMAL SPRAY TECHNOLOGY
·
2024
·Vol. 33
·期 4
·1205-1219
·
IF 3.2
Xu Kaichun,Han Mengjie,Xu Jinyong,Zheng Zichen,Wu Kaidi,Yu Zexin,Liao Hanlin,Zhang Chao
The development of one-step deposition technology for metal oxide-based coatings is significant for the rapid fabrication of gas sensors. Gas sensors based on LaFeO 3 were fabricated by solution precursor plasma spraying (SPPS) strategy. Through a comparative analysis of material composition and cross-sectional morphology, we have determined the optimal spray distance (8 cm), ensuring the highest level of thickness uniformity in the coating (17.13 ± 0.34 μm). Furthermore, the influence of the number of passes on coating morphology and gas sensing performance was investigated. The optimal gas sensor possessed a higher response to isoamyl alcohol (236 at 25 ppm) at 250 °C. Meanwhile, excellent selectivity, repeatability, long-term stability (431.6 ± 9.2 at 60 ppm for 20 days), and a low limit of detection (144 ppb) were obtained. The superior low-concentration (< 25 ppm) gas-sensing performance should be ascribed to the loose porous morphology with uniform thickness and the higher surface activity of the optimal coating. Moreover, the practical experiment demonstrated the application potential of the sensors for monitoring wheat mildew. This work may provide a direction for the characteristic gas detection of wheat mildew and a successful case for the deposition of LaFeO 3 coating by SPPS.
研究领域:
材料科学
·
传感器技术
·
表面工程
·
分析化学
·
食品质量监测
✓ 已验证
DOI
高影响因子
NANO
·
2020
·
IF 1.566
Ke Xu,Xiaosheng Yang,Dagao Sun,Xin Yang,Yumei Zhou,Wei Li,Qindan Yang,Xianjiong Yang,Rong Li,Jian Feng
LaFeO 3 /NiO modified g-C 3 N 4 nanosheets (L-N/CNS) were synthesized by a two-step method. HRTEM results showed that an intimate contact between LaFeO 3 , NiO and N-CNS was successfully established. Ninety percent of phenol was degraded within 120 min, and the hydrogen evolution rate of 171.2 μ mol h − 1 g − 1 was obtained over the L-N/CNS heterojunctions under the visible-light irradiation. It was higher than that of g-C 3 N 4 nanosheets, NiO modified g-C 3 N 4 and LaFeO 3 /g-C 3 N 4 . The ⋅ O 2 − radicals acted the crucial role in the photocatalytic degradation reaction. EIS, PL and time-resolved fluorescence spectra demonstrated that L-N/CNS possessed the highest charge separation efficiency. The intimate contact between LaFeO 3 , NiO and g-C 3 N 4 nanosheets promoted the separation and transfer of photo-induced electron–hole pairs and consequently prolonged the exciton lifetime, and implied more photo-induced electrons could be probably involved in the photocatalytic reactions on the surface of photocatalysts. Thus, the visible-light driven photocatalytic performances of L-N/CNS were effective. This work provided a feasible method to design and construct heterostructures for the exploitation of solar energy.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Jitong Deng,Yanan Zhang,Hongjing Han,Yongjun Zhang,Haiying Wang,Xuzhong Gong,Yanguang Chen
The chemical looping conversion of CH4 has been one of the most promising technologies for achieving the “two-carbon” strategy. Fe2O3 oxygen carrier cannot maintain the excellent release performance of lattice oxygen at high temperature due to the sintering and carbon deposition. Therefore, quaternary La1–xSrxFe1–y CoyO3 perovskite was selected as the transfer support of oxygen ions. By using the MOF precursor method, ternary La0.8Sr0.2FeO3 was prepared via the introduction of metal Sr into the binary LaFeO3. The adsorption energy of CH4 on the La0.8Sr0.2FeO3 was the lowest (−0.054 eV), compared with separate Fe2O3 and LaFeO3, and the adsorption energy of free H at the adjacent Fe site was the lowest (1.650 eV). Furthermore, the La1–xSrxFe1–yCoyO3 perovskite was successfully synthesized by the doping of Co into the ternary La0.8Sr0.2FeO3. La0.8Sr0.2Fe0.8Co0.2O3 was chosen to composite Fe2O3 oxygen carrier. As m(Fe2O3):m(La0.8Sr0.2Fe0.8Co0.2O3) = 1:1, the lattice oxygen conversion rate was less than 47% and the selectivity of CO2 reached 99.5% through the synergistic effect of lattice oxygen and oxygen vacancies. Fe2O3–La0.8Sr0.2Fe0.8Co0.2O3 increased the lattice oxygen conversion by 17.6%, compared with Fe2O3–La0.8Sr0.2FeO3. After the CH4 chemical looping conversion cycles five times, Fe2O3–La0.8Sr0.2Fe0.8Co0.2O3 still had favorable structural stability and oxidation performance, and the lattice oxygen conversion rate still reached >95%.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 45
·2205121
·
IF 19.924
Lixuan Zhang,Kai Wang,Yanqi Jia,Liping Fang,Chen Han,Jiaquan Li,Zongping Shao,Xinyong Li,Jieshan Qiu,Shaomin Liu
Piezoelectric polarization portrays a promising technology to regulate the photogenerated charge carrier separation and transfer behaviors, and the design of multifunctional catalysts with piezo-phototronic effect is a key step. One strategy is to prepare a composite catalyst combining the ideal properties from each individual component. Herein, a facial dopant-induced self-assembling strategy is reported to fabricate an ultracompact nanocomposite (LaFeO 3 /ZnFe 2 O 4 /La 2 O 3 ) with enhanced efficiency for piezo-photocatalysis. The composite is synthesized at 800 °C from the one-pot method, thus the self-constructed interface is created during multi-phase formation, providing the intimate grain-to-grain contact between the semiconductive LaFeO 3 and piezoelectric ZnFe 2 O 4 /La 2 O 3 phases. In such a composite, a synergistic effect for oxygen activation is realized via the effective manipulation of the photogenerated charge carrier separation and spatial transportation through the vibration-created piezopotential. A high piezoelectric coefficient (d 33 ) up to 826 pm V −1 and a superior H 2 O 2 yield of 403 µmol g −1 h −1 (in open air and pure water) are achieved on the optimized composite, outperforming most of the reported lead-free piezo-photocatalyst. The ultracompact composite is very robust without any decay in H 2 O 2 -delivering capability after many cyclic tests. This study provides a universal strategy for the rational design of high-performance piezo-photocatalysts.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2023
·
IF 10.9
Kaili Fu,Jinbo Zhao,Fei Liu,Lili Wu,Zhidong Jin,Yunfei Yang,Jing Qiao,Zhou Wang,Fenglong Wang,Jiurong Liu
Today, electromagnetic wave (EMW) absorbing materials with strong absorption capacity alone are hardly enough to meet the growing problem of EMW pollution. This work is the first designs and synthesizes LaFeO 3 -decorated nitrogen (N)-doped reduced graphene oxide aerogel (LFO/N-rGO) novel composites by a simple hydrothermal method . When the mass ratio of the LaFeO 3 (LFO) nanoparticles : graphene oxide (GO): urea is 1:5:7.5, LFO/N-rGO achieves broadband absorption while possessing strong electromagnetic wave absorption capability. A strong reflection loss (RL) of −64.5 dB is obtained at 9.2 GHz. In addition, the maximum effective absorption bandwidth with a 2.83 mm thickness can reach up to 6.72 GHz. The EMW absorption mechanism analysis shows that the excellent microwave absorption capability is mainly attributed to the enhanced multiple reflections and multi-scattering, enhanced interfacial polarization process, proper conduction loss , and optimized impedance matching characteristics. Herein, this work proposes a new approach to improve the microwave absorption capability of N-doped reduced graphene oxide-based composites and provides a novel strategy to design EMW absorbing materials with wide effective absorption bandwidth and strong absorption capacity.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Jingjing Xu,Chen Liu,Junfeng Niu,Yanlin Zhu,Biying Zang,Mengjuan Xie,Mindong Chen
LaFeO 3 /Bi 3 NbO 7 p-n heterojunction photocatalysts were prepared successfully through an in-situ growth method. The phase structure, optical property , morphology and microstructures of the obtained samples were studied by X-Ray diffractometer (XRD), Ultraviolet–visible absorption spectrum (UV–vis DRS), photoluminescence (PL) spectroscopy, transmission electron microscope (TEM), high resolution transmission electron microscope (HRTEM) and scanning electron microscope (SEM). The visible light responsive photocatalytic activity of as-obtained samples were investigated by the photo-reduction of Cr (Ⅵ). The effects of preparation conditions (proportion of BNO/LFO and temperature) on the activity were studied. Results showed that the as-obtained BNO-LFO-200-5 composite behaved the best photocatalytic activity (with rate constant of 0.0212 min −1 ) among all the obtained samples. The rate constant was about 42.4-times and 17.7-times as that of pristine BNO (0.0005 min −1 ) and LFO (0.0012 min −1 ), respectively. The enhanced photocatalytic property of the as-prepare LaFeO 3 /Bi 3 NbO 7 composites can be ascribed to the formation of p-n junction between BNO and LFO, which significantly increased the separation efficiency of photo-excited electron-holes.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）