Journal of Environmental Chemical Engineering
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2024
·
IF 7.4
Wuxi zhang,Yingzhu Zi,Xinmin Bai,Imarn Khan,Asad ullah,Yue Liu,Anjun Huang,Jianbei Qiu,Yangke Cun,Zhengwen Yang
ABSTRACT The narrow band gap semiconductor LaFeO 3 with ABO 3 perovskite structure has been deeply studied in the field of photocatalysis due to its good thermal stability, chemical stability, photoelectric properties and suitable band position. The inverse opal structure gives the material a large specific surface area and increases the adsorption area and active site of the catalyst. In this work, it is reported for the first time that perovskite LaFeO 3 inverse opal was applied to photocatalytic hydrogen production. The Cd 0.7 Zn 0.3 S QDs were deposited on the skeleton wall of LaFeO 3 inverse opal to construct LaFeO 3 /Cd 0.7 Zn 0.3 S binary heterojunction catalyst. The LaFeO 3 3DOM can effectively increase the contact area with Cd 0.7 Zn 0.3 S QDs with an increase in specific surface area, and the multiple scattering effect improves the efficiency of light utilization. The introduction of Zn 2+ ions regulate the band gap position of Cd 0.7 Zn 0.3 S QDs and increases the thermodynamic reduction ability of photo generated electrons. The Z-type heterojunction effect formed by LaFeO 3 inverse opal and Cd 0.7 Zn 0.3 S QDs facilitates the separation and transmission of photo generated charges. The LaFeO 3 /Cd 0.7 Zn 0.3 S heterojunction catalysts achieved a hydrogen production performance of 277.48 μmol/g/h due to the large specific surface area of 3DOM, good light capture ability, band gap regulation of element doping, and efficient charge separation synergistic effect of heterojunction. This work provides new insights into the design and manufacture of perovskite-type 3DOM heterojunction photocatalysts.
研究领域:
材料科学
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光催化
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产品关联
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 11
·3948
·
IF 3.4
Songlin Han,Yaqiu Tao,Yunfei Liu,Yinong Lu,Zhigang Pan
Porous LaFeO3powders were produced by high-temperature calcination of LaFeO3precursors obtained by hydrothermal treatment of corresponding nitrates in the presence of citric acid. Four LaFeO3powders calcinated at different temperatures were mixed with appropriate amounts of kaolinite, carboxymethyl cellulose, glycerol and active carbon for the preparation of monolithic LaFeO3by extrusion. Porous LaFeO3powders were characterized using powder X-ray diffraction, scanning electron microscopy, nitrogen absorption/desorption and X-ray photoelectron spectroscopy. Among the four monolithic LaFeO3catalysts, the catalyst calcinated at 700 °C showed the best catalytic activity for the catalytic oxidation of toluene at 36,000 mL/(g∙h), and the corresponding T10%, T50%and T90%was 76 °C, 253 °C and 420 °C, respectively. The catalytic performance is attributed to the larger specific surface area (23.41 m2/g), higher surface adsorption of oxygen concentration and larger Fe2+/Fe3+ratio associated with LaFeO3calcined at 700 °C.Keywords:LaFeO3;monolithic;porous material;toluene;catalytic oxidation
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
Materials
·
2024
·Vol. 17
·期 11
·2758
·
IF 3.1
Guang Xian,Tongxin Zheng,Yaqiu Tao,Zhigang Pan
LaFeO3thin films were successfully epitaxially grown on single-crystalline SrTiO3substrates by the one-step hydrothermal method at a temperature of 320 °C in a 10 mol/L KOH aqueous solution using La(NO3)3and Fe(NO3)3as the raw materials. The growth of the films was consistent with the island growth mode. Scanning electronic microscopy, elemental mapping, and atomic force microscopy demonstrate that the LaFeO3thin films cover the SrTiO3substrate thoroughly. The film subjected to hydrothermal treatment for 4 h exhibits a relatively smooth surface, with an average surface roughness of 10.1 nm. X-ray diffraction in conventional Bragg–Brentano mode shows that the LaFeO3thin films show the same out-of-plane orientation as that of the substrate (i.e., (001)LaFeO3||(001)SrTiO3). The in-plane orientation of the films was analyzed by φ-scanning, revealing that the orientational relationship is [001]LaFeO3||[001]SrTiO3. The ω-rocking curve indicates that the prepared LaFeO3films are of high quality with no significant mosaic defects.
研究领域:
材料科学
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物理化学
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产品关联
DOI
PubMed
高影响因子
AICHE JOURNAL
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2022
·Vol. 68
·期 6
·e17640
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IF 4.167
Jingpeng Zhang,Yaning Wang,Jiaming Tian,Binhang Yan
Cu-based catalysts, which are regarded as the most promising catalysts for CO 2 conversion, suffer dramatic deactivation at high temperatures. In this work, LaFeO 3 , a typical perovskite-type oxide, is employed to disperse and stabilize Cu particles for the reverse water gas shift reaction. Compared to traditional Cu-based catalysts, Cu/LaFeO 3 exhibits a higher conversion with 100% CO selectivity and better stability at 873 K. Structural and spectroscopic characterization including N 2 O chemisorption, high-resolution transmission electron microscopy, in situ x-ray diffraction, and x-ray absorption fine structure show that metallic Cu is well dispersed on LaFeO 3 , forming more Cu-LaFeO 3 interface. CO 2 temperature-programmed surface reaction (CO 2 -TPSR), two-step transient surface reaction (two-step TSR), and transient in situ diffuse reflectance infrared Fourier transformed spectroscopy experiments demonstrate that the superior activity is attributed to the synergistic effect between the highly dispersed Cu particles for H 2 dissociation and the abundant oxygen vacancies in LaFeO 3 support for CO 2 activation. The synergistic effect between metal and perovskite-type oxide increases metal-support interfaces and enhances CO 2 activation, leading to a potential application in a variety of chemical reactions.
研究领域:
化学工程
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催化材料科学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2025
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IF 7.7
Ying Qian,Jie Zou,Xiaoqing Jiang,Jie Wang,Juan Zhou,Chu Cheng,Xin Zhang,Wenming He,Qinghui Jin,Jiawen Jian
Yttria-stabilized zirconia (YSZ)-based amperometric humidity sensors are highly promising for in situ detection of high-temperature flue ducts due to their excellent stability and durability under extreme conditions. However, selectivity remains challenging due to the co-electrolysis of H 2 O and CO 2 , as these compounds have similar electrolysis voltages. In this study, LaFeO 3 is proposed as a sensing electrode to reduce CO 2 electrolysis and improve selectivity in amperometric humidity sensors. Analysis indicates that the improved selectivity is likely due to LaFeO 3 ’s lower electrochemical activity. Furthermore, the proposed sensor exhibits good repeatability and acceptable long-term stability for high-temperature humidity detection.
研究领域:
材料科学
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
Chemosensors
·
2023
·Vol. 11
·期 8
·439
·
IF 4.2
Ensi Cao,Yixuan Zhang,Li Sun,Bing Sun,Wentao Hao,Yongjia Zhang,Zhongquan Nie
The development of a rapid, highly sensitive, and dependable acetone sensor holds significant importance for human health and safety. To enhance the acetone sensing performance of LaFeO3nanoparticles for practical applications, commercial n-type WO3nanoparticles were incorporated as additives. They were directly mixed with LaFeO3nanoparticles produced through a sol-gel method, creating a series of WO3-LFO nanocomposites with varying mass ratios. These nanocomposites were characterized using XRD, SEM, BET, and XPS techniques. Compared to pure LFO nanoparticles, the prepared nanocomposites exhibited larger specific surface areas with enhanced surface reactivity. The introduction of p-n heterojunctions through the mixing process improved the regulation of acetone molecules on internal carrier conduction within nanocomposites. As a result, the nanocomposites demonstrated superior acetone sensing performance in terms of optimal operating temperature, vapor response value, selectivity, and response/recovery speed. Notably, the nanocomposites with a 5wt% addition of WO3showed the lowest optimal operating temperature (132 °C), the fastest response/recovery speed (28/9 s), and the highest selectivity against ethanol, methanol, and EG. On the other hand, the nanocomposites with a 10wt% addition of WO3displayed the maximum vapor response value (55.1 to 100 ppm) at an optimal operating temperature of 138 °C, along with relatively good repeatability, stability, and selectivity.Keywords:LaFeO3;WO3;nanocomposites;acetone;XPS
研究领域:
材料科学
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传感器技术
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表面化学
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产品关联
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
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2017
·Vol. 44
·期 2
·1013-1024
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IF 1.369
Li Yan,Hu Yingfei,Fang Tao,Li Zhaosheng,Zou Zhigang
BiVO 4 has emerged as a promising material for solar water splitting. The poor ability of charge transport and separation always limits its performance for photoelectrochemical water splitting. Herein, we coupled n-type BiVO 4 with p-type LaFeO 3 and LaCoO 3 , achieving a photocurrent more than two times as high as bare BiVO 4 at 1.23 V versus a reversible hydrogen electrode. Also, the onset potential was negatively shifted about 260 mV. The promotion of performance is mainly because the space charge layer in BiVO 4 is broadened, and the band bend is enhanced, which facilitates the separation and transport of photo-generated charges.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Xianke Zhang,Suqiong Xu,Zhiqian Yao,Xiaoqing Liu,Jujun Yuan,Fangguang Kuang,Shuying Kang,Huajun Yu
Single-phase materials with exchange bias (EB) effect at room temperature (RT) are very important for future applications in spintronic devices, magnetic storage, and sensors. To explore materials showing the EB effect at RT is an interesting and important issue. In this paper, LaFeO 3 micro-polyhedrons composed of an average particle size of 66 nm nanoparticles have been synthesized by annealing LaFe(CN) 6 precursors in air at 630 °C for 8 h. Magnetic hysteresis loops show that LaFeO 3 micro-polyhedrons present a large spontaneous EB (SEB) effect ( ∼ 1.5 kOe) at RT after zero-field cooling (ZFC) and a gigant conventional EB (CEB) effect ( ∼ 5.6 kOe) after field cooling (FC) of 70 kOe. To the best of our knowledge, the current compound shows the largest negative EB field after ZFC at RT among SEB materials discovered so far. The successful fitting of training effect (TE) data with Binek’s model shows that the origin of SEB lies in the interface exchange coupling between different magnetic phases. The interface with the “pinning” effect of antiferromagnetic (AFM) matrix relative to ferromagnetic (FM) clusters exhibits unidirectional anisotropy, which is formed during the initial magnetization process. This interesting finding of the SEB effect at RT in single-phase perovskite LaFeO 3 system may open a new direction for possible technological applications.
研究领域:
材料科学
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磁学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2016
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IF 8.328
Yane Zheng,Kongzhai Li,Hua Wang,Dong Tian,Yuhao Wang,Xing Zhu,Yonggang Wei,Min Zheng,Yongming Luo
Chemical-looping reforming of methane (CLRM) offers an effective approach for coproducing syngas and pure hydrogen. In this work, CeO 2 nano particles (2–3 nm) are well dispersed on the wall surface of three-dimensional ordered macroporous (3DOM) LaFeO 3 , obtaining a highly efficient oxygen carrier for the CLRM technology. The physical and chemical properties of the oxygen carriers were characterized by SEM, TEM, H 2 -TPR, XPS, XRD, CH 4 -TPR and CH 4 -TPD techniques. It is found that the presence of CeO 2 on LaFeO 3 results in the formation of Ce 3+ and Fe 2+ due to the CeO 2 -LaFeO 3 interaction. The coexistence of Ce 3+ and Fe 2+ irons induces abundant oxygen vacancies on the mixed oxides, which strongly improves the reducibility, oxygen mobility and reactivity for methane oxidation. The presence of CeO 2 also improves the resistance towards carbon deposition formation, and this allows the CeO 2 /LaFeO 3 materials own high available oxygen storage capacity (available OSC, the maximum amount of oxygen consumed by methane reduction without the formation of carbon deposition). It is also noted that the agglomeration of CeO 2 nano particles would reduce the reactivity of oxygen carriers. Among all the obtained samples, the 10% CeO 2 /LaFeO 3 sample exhibits the highest yields of syngas (9.94 mmol g −1 ) and pure hydrogen (3.38 mmol g −1 ) without the formation of carbon deposition, which are much higher than that over the pure LaFeO 3 sample (5.73 mmol g −1 for syngas yield and 2.00 mmol g −1 for hydrogen yield). In addition, the CeO 2 /LaFeO 3 oxygen carrier also showed high stability during the successive CLRM testing either in the activity (yields of syngas and pure hydrogen) or structure (macroporous frameworks) aspect.
研究领域:
能源科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2020
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IF 8.758
Yangqin Gao,Guoqing Yang,Yanjie Dai,Xuli Li,Jianfeng Gao,Ning Li,Ping Qiu,Lei Ge
Co-substituted LaFeO3 was electrodeposited on the surface of BiVO4 as a co-catalyst to enhance the water splitting performance. Compared to bare BiVO4, the BiVO4/Co-LaFeO3 composite photoanode shows a water oxidation photocurrent of 3.4 mA/cm2 at 1.23 V versus reverse hydrogen electrode, accompanied by a notable cathodic shift in the onset potential for 300 mV. Combined optical and electrochemical characterizations show that the solid/electrolyte charge transfer efficiency of BiVO4 are dramatically improved by the incorporation of Co-substituted LaFeO3. From the surface kinetic study of charge carriers by intensity-modulated photocurrent spectroscopy, a suppressed surface recombination rate constant is observed and the enhanced photoelectrochemical water splitting performance observed in the BiVO4/Co-LaFeO3 photoanode is attributed to the surface passivation effect of Co-substituted LaFeO3.
研究领域:
材料科学
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电化学
·
可再生能源
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 23
·14602-14609
·
IF 3.269
Ke Xu,Hong Xu,Guangwei Feng,Jian Feng
NiS cocatalyst modified LaFeO3/g-C3N4 heterostructures were successfully prepared and their photocatalytic hydrogen evolution performance under visible light irradiation was presented. LaFeO3/g-C3N4/NiS composites were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), inductively coupled plasma mass spectrometry (ICP-MS), X-ray photoelectron spectroscopy (XPS), nitrogen adsorption desorption isotherms, UV-vis diffuse reflectance spectroscopy (DRS), transient photocurrent responses and electrochemical impedance spectroscopy (EIS). The results indicated that the LaFeO3/g-C3N4/NiS heterostructures had enhanced photocatalytic hydrogen evolution performance than pure g-C3N4, LaFeO3 and LaFeO3/g-C3N4. 5%-LaFeO3/g-C3N4/2%NiS exhibited the highest photocatalytic hydrogen evolution rate of 121 μmol g−1 h−1 under visible light, which was almost 60 times higher than the hydrogen evolution rate of 5%-LaFeO3/g-C3N4. The effective separation of photogenerated electron–hole pairs in the LaFeO3/g-C3N4 Z-scheme system with NiS as a cocatalyst enhanced the photocatalytic hydrogen evolution performance. This study provided a facile approach to prepare NiS modified LaFeO3/g-C3N4 heterostructures and to construct an effective photocatalytic system for hydrogen evolution under visible light irradiation.
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
OPTICAL MATERIALS
·
2024
·
IF 3.8
Lianke Zhang,Ruidan Zhang,Shuaishuai Zhang,Peng Sun
A composite photocatalyst KCN/LFO was synthesized using K-modified g-C 3 N 4 (KCN) and LaFeO 3 (LFO). The photocatalytic activity of the KCN/LFO was evaluated by degrading indole (heterocyclic organic compound). The KCN/LFO-10 (mass fraction of LaFeO 3 with 10%) displayed the highest removal rate of indole. Indole was degraded to 97.366% after 60 min. The photocurrent and electrochemical impedance spectroscopy (EIS) results suggested that the close correlation between KCN and LaFeO 3 can increasing the efficiency of photogenerated carrier separation. The capture experiment results demonstrated that ·O 2 − and ·OH is primary active substance, respectively. Moreover, the degradation efficiency of KCN/LFO-10 to indole remains stable at 87% after four successive experiments of indole photocatalytic degradation. This work presents an effective method for addressing the pollution caused by heterocyclic organic compound .
研究领域:
环境科学
·
材料科学
✓ 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）