JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2024
·
IF 4.1
Xiangqian Guo,Chenhui Qiu,Lei Wang,Jing Ding,Jinfeng Zhang,Hui Wan,Guofeng Guan
Photocatalytic CO 2 reduction with perovskite can effectively address both energy and environmental issues. Nevertheless, it remains challenging to prepare photocatalysts with suitable hollow tubular structures in rational. Herein, the La 1-x Sr x Co 1-δ Fe δ O 3 nanofiber with a hollow tubular structure was fabricated through an electrospinning method. The hollow nanofiber structure was constructed by doping Sr atoms in the A-site and Fe atoms in the B-site of LaCoO 3 perovskite. The characterization of TEM proved that the hollow tubular structural La 1-x Sr x Co 1-δ Fe δ O 3 nanofiber exhibited an external diameter of about 95 nm and an internal diameter of about 50 nm. The hollow tubular structural La 1-x Sr x Co 1-δ Fe δ O 3 nanofiber showed superior carrier separation ability which could exhibit significant advantages for photocatalytic CO 2 reduction. The CH 3 OH generation rate over the optimized La 0.8 Sr 0.2 Co 0.7 Fe 0.3 O 3 nanofiber could reach 5.25 µmol⋅g −1 ⋅h −1 . This work highlighted an electrospinning strategy to build a hollow tubular structural La 1-x Sr x Co 1-δ Fe δ O 3 nanofiber for enhancing photoreduction CO 2 .
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 Applied Materials & Interfaces
·
2025
·
IF 8.2
Jiabao Bai,Yaoyu Du,Yana Liu,Yunfeng Zhu,Jiguang Zhang,Rui Shi,Jun Wang,Zhixin Ba,Wenrong Cai
In this work, a three-dimensional network LaCoO3 (3D LaCoO3) was successfully synthesized by the colloidal crystal template technique and used for optimizing the de/hydrogenation performance of magnesium hydride (MgH2). 3D LaCoO3 displays a unique three-dimensional network macroporous structure with interconnected pores, where LaCoO3 nanoparticles (10–20 nm) are homogeneously anchored on the macroporous pore walls. Remarkably, MgH2 doped with 5 wt % 3D LaCoO3 can quickly release 6.06 wt % H2 at 300 °C within 1200 s and absorb 6.13 wt % H2 at 175 °C within 1800 s. Furthermore, MgH2-5 wt % 3D LaCoO3 exhibits a capacity retention rate of 98.12% after 10 cycles, indicating excellent reversibility. The superior catalytic performance originates from the unique 3D network structure of 3D LaCoO3 and the in situ formed Co/La4Co3O9 heterostructure during the first dehydrogenation process. The 3D network structure can make a more uniform distribution of the catalyst during ball milling, leading to more catalytic active sites. The experimental results prove that the in situ formed Co/La4Co3O9 heterostructure plays a key role in enhancing the de/hydrogenation performance of MgH2. Additionally, the DFT calculation results confirm that the Co/La4Co3O9 heterostructure exhibits a higher hydrogen absorption ability due to significant electron transfer between the Co and La4Co3O9 interfaces, which can facilitate the hydrogen absorption and desorption of MgH2. These findings provide a fresh approach to designing and preparing catalysts with distinctive morphologies for MgH2-based systems.
研究领域:
材料科学
·
能源存储
·
纳米技术
·
催化
·
氢能
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 25
·12217-12228
·
IF 3.925
Xiaoying Yuan,Yue Leng,Changlong Fang,Kangqi Gao,Chenyu Liu,Jianjun Song,Yingshu Guo
Tetracycline hydrochloride (TC) is a typical refractory organic pollutant, and is frequently detected in different water environments, which will increase microbial drug resistance, destroy ecosystems and threaten human health. It is urgent to develop a simple and effective catalyst for TC removal. In this paper, a facile two-step calcination method was used to prepare a LaCoO3/g-C3N4 composite catalyst with high activity and high stability for PMS activation to degrade TC. Various characterization results confirmed that the LaCoO3/g-C3N4 composite catalyst possessed smaller particle size, higher stability and faster electronic transmission ability. Benefiting from the synergistic effect between LaCoO3 and g-C3N4, the LaCoO3/g-C3N4 catalyst showed high activity for PMS activation to degrade different antibiotics. Furthermore, the results of the quenching experiments and the electron paramagnetic resonance (EPR) tests showed that the generated SO4˙− and 1O2 radicals during the PMS activation process played a key role in pollutant degradation. The effect of different reaction conditions (including pH, temperature, PMS concentration, catalyst dosage and different anions) on the performance of the catalyst was also investigated. The catalyst cycle evaluation experiments showed that the LaCoO3/g-C3N4 composite catalyst has high stability and reusability. The phytotoxicity evaluation based on seed germination experiments indicated that the LaCoO3/g-C3N4 composite catalyst system can effectively reduce the toxicity of antibiotics.
研究领域:
环境科学
·
材料科学
·
生物学
✓ 已验证
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Xin Huang,Zijun Ran,Zhi He,Jingyu Ran
Mercury has a significant impact on environment and is mainly derived from coal-fired power plant. Herein, we report a potential route for efficient removal of Hg 0 via oxidation reactions using Ce-doped LaCoO 3 supported on CeO 2 catalyst. Catalyst characterization results proved that Ce can successfully substitute a desired part of Co into the LaCoO 3 crystal lattice via a sol–gel method. The Hg 0 removal experiments suggest that Hg 0 removal efficiency decreased in the order of La 0.875 Ce 0.125 CoO 3 /CeO 2 > La 0.875 Ce 0.125 CoO 3 > LaCoO 3 . The presence of O 2 provided more active oxygen and resulted in approaching 100% Hg 0 removal efficiency. Introducing H 2 O and sole SO 2 would significantly reduce the Hg 0 removal efficiency as a result of competitive adsorption on the actives sites of the catalyst. On the other hand, SO 2 could reacted with Hg 0 in the presence of O 2 and thereby recover the high Hg 0 removal efficiency and the La 0.875 Ce 0.125 CoO 3 /CeO 2 catalyst presented a good performance towards sulfur resistance. Furthermore, the catalyst still exhibited a high Hg 0 removal efficiency performance after five times consecutive recycles.
研究领域:
环境科学
·
催化
·
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 36
·2282
·
IF 2.8
Yu Man,Zhou Yingying,Yang Chaoqun,Lu Yuanyuan,Zhao Xiaojuan,Gong Zhen,Kong Xiangning,Xie Hui
La 1- x Sr x Co 0.9 Fe 0.1 O 3 ( x = 0, 0.1, 0.15, 0.2) perovskite oxides were successfully synthesized by the sol–gel method, with Sr 2 ⁺ doping at the A-site and Fe 3+ at B-site of LaCoO 3 . The effect of AB-site co-doping on the structure, morphology, electromagnetic parameters, and microwave absorption properties was systematically investigated. The optimal composition La 0.85 Sr 0.15 Co 0.9 Fe 0.1 O 3 achieved a minimum reflection loss of −42.79 dB at 1.5 mm thickness and an effective absorption bandwidth of 5.44 GHz (11.92–17.36 GHz) at 1.8 mm. This remarkable performance arises not only from the presence of defects and the enhanced polarization loss due to oxygen vacancies induced by Sr 2+ and Fe 3+ co-doping, but also from synergistic effects including multiple reflections and scattering from the porous microstructure, interfacial polarization, and magnetic loss mechanisms. These results demonstrate that simultaneous A-site and B-site doping is an effective strategy to achieve thin, broadband, and high-performance microwave absorbers, highlighting a promising route for the development of perovskite-based EM wave absorption materials.
研究领域:
材料科学
·
电磁学
·
功能材料
·
无机化学
·
纳米材料
·
复合材料
·
电子显微学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Peng Qiu,Ao Wang,Haoyu Zheng,Lichao Jia,Bo Chi,Jian Pu,Jian Li
LaCoO 3-δ (LC)-coated Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ (BSCF) cathode is fabricated by the solution impregnation method and promoted electrochemical performance is obtained. After being coated by LC shell, the polarization resistance can be as low as 0.197 Ω cm 2 and the peak power density is 0.243 W cm −2 at the operating temperature of 600 °C. The excellent CO 2 resistance of LC-coated BSCF cathode is verified by the CO 2 -poisoning test. Even in the operating atmosphere with high CO 2 concentration, the polarization resistance change of LC-coated BSCF cathode is much smaller than that of the blank BSCF cathode. By long-term test of single cells, the remarkable electrochemical performance stability of LC-coated BSCF cathode is shown. The promoted electrochemical performance, excellent CO 2 resistance and remarkable long-term stability make LC-coated BSCF cathode promising for intermediate temperature solid oxide fuel cells.
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
Materials Today Chemistry
·
2023
·
IF 7.3
N. Ji,J. Xu,Y. Wang,M. Guo,X. Xu
Many nanoproteases contain quadrivalent metal ions and catalyze peptide-bond hydrolysis only at high temperature (60 °C). Their catalytic efficiency is much less than natural proteases. It leaves a great challenge to develop efficient and reusable nanoproteases with high protease activity at room temperature. Here, we have explored nanoproteases from eight low valent metal oxide nanoparticles . Among these nanoparticles, only perovskite LaCoO 3 nanoparticles (LaCoO 3 NPs) selectively hydrolyze bovine serum albumin (BSA) at X-Lys peptide bonds at 20 °C, producing fragments of 10–45 kDa, which are adapted to middle-down proteomics. LaCoO 3 NPs have high stability and excellent reuse performance. LaCoO 3 NPs also hydrolyze surfactant-denatured and heat-denatured BSA. Preliminary mechanism analysis indicates that the low valency of Co 2+ and the strong Lewis acidity of La 3+ played key roles in the high protease activity of LaCoO 3 NPs. This work demonstrates that LaCoO 3 NPs are a high promising nanoprotease to selectively hydrolyze insoluble and soluble proteins at 20 °C. More importantly, our findings highlight that manufacture of low valent metal ions-contained nanoparticle is an effectual strategy for fabricating high-efficiency nanoprotease.
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2020
·Vol. 25
·期 12
·2725
·
IF 3.267
Xuefei Zhou,Haowei Wu,Longlong Zhang,Bowen Liang,Xiaoqi Sun,Jiabin Chen
Advanced oxidation processes (AOPs) are effective ways to degrade refractory organic contaminants, relying on the generation of inorganic radicals (e.g.,•OH and SO4•−). Herein, a novel AOP with organic radicals (R-O•) was reported to degrade contaminants. Lanthanum cobaltite perovskite (LaCoO3) was used to activate peracetic acid (PAA) for organic radical generation to degrade sulfamethoxazole (SMX). The results show that LaCoO3exhibited an excellent performance on PAA activation and SMX degradation at neutral pH, with low cobalt leaching. Meanwhile, LaCoO3also showed an excellent reusability during PAA activation. In-depth investigation confirmed CH3C(O)O•and CH3C(O)OO•as the key reactive species for SMX degradation in LaCoO3/PAA system. The presence of Cl−(1–100 mM) slightly inhibited the degradation of SMX in the LaCoO3/PAA system, whereas the addition of HCO3−(0.1–1 mM) and humic aid (1–10 mg/L) could significantly inhibit SMX degradation. This work highlights the generation of organic radicals via the heterogeneous activation of PAA and thus provides a promising way to destruct contaminants in wastewater treatment.Keywords:advanced oxidation processes (AOPs);peracetic acid;LaCoO3;organic radicals
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
FERROELECTRICS
·
2024
·
IF 0.6
Muhammad Rafiq,Raza Ullah,Adeel Ahmed,Muhammad Usman,Bing Yu,You-Qing Shen,Hai-Lin Cong
Perovskite has attracted a lot of attention in the area of present-day environmental catalysis because of its cheap cost, excellent stability, great catalytic activity, varied structure, and significant transformation flexibility. In order to remove organic contaminants from wastewater, researchers have been experimenting with combining perovskite catalysts with advanced oxidation processes (AOPs). Herein present study, LaCoO3 was synthesized and calcined at 450, 650, and 850 °C (LC450, LC650, and LC850), and the connections between their surface features and crystalline assembly to catalytic performance were thoroughly explored to activate peroxymonosulfate (PMS) in order to degrade aqueous organic contaminants. Further, the catalysts were characterized by XRD, FTIR, FSEM, and TEM, and their catalytic efficiency was investigated. The Co-O bond length is recommended as a biomarker for PMS activation because it strongly influences the Co2+/Co3+ redox capability, regulating the total PMS activation. LC850/PMS has demonstrated the highest degradation efficiency (79%), with kapp value 0.102 min−1. Further modification of these types of perovskite catalysts might be very feasible and promising to degrading organic pollutants.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 66
·53441-53447
·
IF 3.84
Jia Ma,Yunlong Ning,Cairong Gong,Gang Xue,Guoliang Fan
Three-dimensionally ordered macroporous (3DOM) SiOC was successfully fabricated on a cordierite monolith inner wall of a polystyrene (PS) sphere template through a colloidal crystal templating (CCT) method (named as 3DOM SiOC/cordierite). And perovskite-type LaCoO3 (LCO) mixed metal oxides, prepared by a facile sol–gel process, were coated onto the wall of the 3DOM SiOC/cordierite by a simple impregnation-sintering approach (named as LCO/3DOM SiOC/cordierite). The morphological and physicochemical properties studies indicate that the 3DOM structure has excellent connectivity, a large specific surface area, and applicable pore size. And the 3DOM structure plays an important role in preventing aggregation of the targeted catalyst particles, improving the contact condition between catalysts and soot as well as enhancing the reducibility of the LCO. The subsequent investigation on the catalytic performance of the 3DOM samples for diesel soot combustion shows that the 3DOM texture offers the catalyst a lower soot combustion temperature than a conventional catalyst, and the LCO/3DOM SiOC/cordierite reduces the combustion temperature even further while avoiding the rise of back-pressure effectively as well.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Wei Yuan,Lichun Cheng,Tianrui Xia,Yucheng Chen,Qianxing Long,Qingrong Yao,Shunkang Pan,Chaohao Hu
Perovskite LaCoO 3 has unique mixed ionic electronic and structural defects, which has high research value in microwave absorption field. LaCoO 3 precursor was prepared by sol-gel method, and LaCo 1− x Fe x O 3 (Fe-LCO, x = 0, 0.05, 0.1 and 0.15) with rhombic symmetric structure was successfully synthesized at 600 °C. By refinement of X-ray diffraction (XRD) (Rietveld analysis), it was found that Fe doping makes LaCoO 3 lattice constant and cell volume increase. As a dielectric loss microwave absorbing material, the electromagnetic attenuation of LaCoO 3 is mainly due to the conduction loss, while the interface and dipole polarization are secondary reasons. It finds that Fe doping can improve the wave absorption performance of LaCoO 3 . The best absorbing performance was obtained when Fe content is x = 0.1, with the maximum reflection loss of − 38.99 dB at 10.8 GHz and the effective absorption bandwidth (RL<−10 dB) is 4.48 GHz, while the corresponding thickness was only 3 mm. In summary, LaCoO 3 has broad application prospects in X and Ku bands.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Renjie Xie,Zhiwei Nie,Xiangchen Hu,Yi Yu,Carmela Aruta,Nan Yang
Developing inexpensive, efficient, and stable electrocatalysts for oxygen evolution reaction (OER) is crucial in energy conversion devices. The high cost and insufficient stability of the state-of-the-art IrO2 electrocatalysts for OER have restricted their widespread applications. In this work, La1–xPrxCoO3 perovskites with different Pr doping concentrations (x = 0, 0.25, 0.5, 0.75, 1) were investigated as alternative and inexpensive OER electrocatalysts. The OER activity was observed to increase with Pr doping and was maximum at the 50 mol % doping concentration. The overpotential of La0.5Pr0.5CoO3 was reduced to 312 mV at 10 mA·cm–2, which was significantly smaller than 371 mV of LCO and even superior to that of the commercial IrO2 catalysts (341 mV). Furthermore, La0.5Pr0.5CoO3 showed more stable performance in long-term tests compared with Pr0.5Ba0.5CoO3 and La0.6Sr0.4CoO3. X-ray diffraction analysis showed phase transition from a rhombohedral to an orthorhombic structure with Pr doping. Based on X-ray photoelectron spectrum analysis, the enhanced OER activity of La0.5Pr0.5CoO3 was correlated to electron occupation close to the Fermi level and the hybridization of O 2p and Co 3d bands, which facilitated the electron transfer process of the OER. Our work is therefore expected to provide a facile method of designing high-performance and stable OER perovskite catalysts through an approach based on electronic occupation regulation.
研究领域:
材料科学
·
电化学
·
能量转换
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）