KOREAN JOURNAL OF CHEMICAL ENGINEERING
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2019
·Vol. 36
·期 11
·1826-1838
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IF 2.476
Garba Zaharaddeen N.,Xiao Wei,Zhou Weiming,Lawan Ibrahim,Jiang Yifan,Zhang Mingxi,Yuan Zhanhui
Due to increasing interest in the application of perovskites as promising adsorbents, the present study looks at how central composite design (CCD), a subset of response surface methodology (RSM), can statistically play a role in producing optimum lanthanum oxide-cobalt perovskite type nanoparticles (LaCoO 3 ) by using a modified proteic synthesis method. The optimum LaCoO 3 produced was tested for its capability in removing methyl orange (MO) and rhodamine B (RhB) dyes from aqueous solution. Calcination temperature and calcination time were optimized with the responses being percentage yield, MO and RhB removal. The best temperature and calcination time obtained were 775 °C and 62 mins, respectively, giving good and appreciable values for the three responses. The resulting optimal LaCoO 3 was characterized by Fourier transform infra-red (FTIR), ultraviolet-visible spectrophotometry (UV/vis), scanning electron microscopy (SEM), pH of zero point charge (pH pzc ) as well as BET analysis, yielding a mesoporous adsorbent with surface area of 61.130 m 2 g −1 as well as 223.55 and 239.45 mg g −1 as the monolayer adsorption capacity values for MO and RhB, respectively. Freundlich model was the best in describing the equilibrium adsorption data with respect to both MO and RhB with the kinetic data for the two dyes both obeying pseudo-second-order kinetics model.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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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.
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ACS Applied Materials & Interfaces
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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.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Yiran Zhang,Bang Xiao,Lin Yang,Anqi Jiao,Ke Li,Chunping Wu,Reggie Zhan,Zhen Huang,He Lin
YSZ-based mixed-potential sensors with double-sensing electrodes were fabricated for ammonia (NH 3 ) detection. ZnO and LaCoO 3 nanoparticles prepared by flame spray pyrolysis (FSP) method were used as the sensing materials. The sensing responses of ZnO and LaCoO 3 sensing electrodes can be overlapped based on the double-sensing-electrode structure, thereby significantly enhancing the sensitivity compared with the traditional mixed-potential sensors using Pt reference electrode. The sensitivities of this sensor reached up to -102.85, -75.312, -70.165, -48.616 mV/decade to 10–50 ppm NH 3 at 450, 475, 500, 525 ℃ , respectively. Moreover, the NO 2 interference effects on NH 3 detection of ZnO and LaCoO 3 electrodes were opposite and can be counteracted based on the double-sensing-electrode structure, eliminating most of the cross-sensitivity to NO 2 . The double-sensing-electrode sensor exhibited good performance under CO, CH 4 , NO, NO 2 interference, oxygen fluctuation, and humidity variations, and showed good long-term stability. The results of sensing performance exhibited the sensors with double-sensing electrodes have a great potential for application on SCR system of diesel engines. In further studies, each sensing electrode can be optimized respectively and the sensitivity and selectivity of NH 3 sensors could be enhanced to a higher level.
研究领域:
传感器学
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材料科学
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环境监测
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能源工程
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气体传感
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纳米材料
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催化化学
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ACTA PHYSICO-CHIMICA SINICA
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2026
·
IF 13.5
Yue Zhao,Jie Zhang,Mingcan Wu,Li Zhao,Anan Wang,Kezhen Qi
The conflict between high-efficiency algal inactivation and ecological safety represents a critical bottleneck in the photocatalytic control of harmful algal blooms (HABs). Conventional copper-based photocatalysts, although effective, often cause severe secondary pollution and aquatic toxicity. To address this trade-off, we constructed a biologically safe S-scheme heterojunction by covalently anchoring LaCoO 3 (LCO) octahedrons onto PTP-DABDT amide–imine functional polymers. Unambiguous spectroscopic evidence, including femtosecond transient absorption (fs-TA) spectroscopy and in-situ irradiated X-ray photoelectron spectroscopy (XPS), confirms the formation of an internal electric field (IEF). This field drives ultrafast S-scheme charge transfer, effectively suppressing charge-carrier recombination while preserving strong redox potentials. Consequently, the optimized 20LCO/PTP-DABDT composite exhibits a remarkable “Kill-and-Clean” effect, achieving 64.39% degradation of chlorophyll-a in Microcystis aeruginosa to suppress algal blooms while simultaneously degrading the released microcystins. More importantly, comparative toxicity analysis reveals a paradigm shift: unlike conventional Cu-based algicides, which induce 100% mortality in non-target organisms ( Lateolabrax japonicus ), our system maintains a survival rate exceeding 90%. This study presents a pioneering “ecological regulation” strategy, offering a sustainable solution that balances efficient algal inactivation with intrinsic environmental biosafety. A LaCoO 3 /PTP-DABDT S-scheme heterojunction was developed for photocatalytic algal control, achieving 64.39% chlorophyll-a degradation and microcystin removal, while maintaining > 90% fish survival, thus balancing efficiency with ecological safety. Download: Download high-res image (418KB) Download: Download full-size image
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JOURNAL OF POWER SOURCES
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2025
·
IF 7.9
Yan He,Jinpeng Guo,Chuanchuan Bi,Zhifei Hao,Bin Zhao,Chunping Li,Xiaogang Han,Qi Wang
Composite polymer electrolytes (CPE) have attracted considerable attention due to their potential to achieve high flexibility and large energy density. However, their practical application is hampered by their suitability at a single temperature and severe lithium dendrite growth. In this work, we have doped the perovskite inorganic filler LaCoO 3 into polyamide (PI) nanofibers and constructed a LaCoO 3 /PI/PVDF CPE. Electrochemical characterization of the CPE and density functional theory calculations performed for it show that perovskite nanofibers have abundant oxygen vacancies, which are conducive to accelerating the dissociation of lithium salts and releasing more free lithium ions. Li//Li symmetric batteries exhibit excellent long cycle performance (over 3000 h) at 30 °C, and LiFePO 4 //Li batteries exhibit excellent cycling performance with over 1000 cycles at (0.5 C, 30 °C) and 400 cycles at (0.2 C, 60 °C), which can be realized with high voltage cathode NMC 811. The physical properties of the CPEs are also quite outstanding, with good thermal stability as it can withstand a high temperature of 200 °C and tensile strength up to 12.01 MPa. This work presents a new idea for designing CPEs with high safety and excellent electrochemical properties, which can provide stable circulation over a wide temperature range.
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ACS Catalysis
·
2024
·
IF 11.3
Baoxin Ge,Pengyang Jiang,Biyi Chen,Caijin Huang
The orbital hybridization between metal and oxygen of perovskite catalysts can lower the overpotential and enhance the oxygen evolution reaction (OER) activity. This study combines density functional theory with experiments to clarify how Sr/Fe codoping modulates orbital hybridization and enhances OER catalytic activity of LaCoO3. The as-prepared La0.50Sr0.50Co0.75Fe0.25O3 shows remarkable performance with a low overpotential of 310 mV at 10 mA cm–2 current density and a 107.03 mV dec–1 Tafel slope, outperforming most state-of-the-art perovskite-based OER electrocatalysts. The experimental results confirm that Sr/Fe codoping enhances the expansion of Co–O–Co bond angles and strengthens the covalency of the Co–O bond in LaCoO3, leading to enhanced electrocatalytic activity. Moreover, increasing Sr doping reduces the distance between the Co 3d/O 2p center and the Fermi level, decreasing the energy difference between them and enhancing the degree of orbital hybridization between Co 3d and O 2p. As the degree of Co 3d/O 2p orbital hybridization increases, a higher charge transfer was found between the active center and intermediate product, OOH, reducing the energy barrier of the rate-determining step while lowering the overpotential. This study provides thorough insight into the rational design of OER catalysts based on orbital hybridization.
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ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Jianyi Lei,Jiajun Dai,Kok Bing Tan,Jiale Huang,Guowu Zhan,Qingbiao Li
Direct epoxidation of propylene to propylene oxide (PO) with molecular oxygen as the most atomically economical route remains challenging due to the low PO yield. In this study, CuO supported on perovskites (LaCoO3) modified with NaCl was found to be active for direct epoxidation of propylene with oxygen. LaCoxCu1–xO3– modified with alkali metal salts were further fabricated to improve catalytic performance with the assistance of citric acid. Among the investigated catalysts, LaCo0.8Cu0.2O3−δ exhibited the best catalytic performance, with a PO formation rate of 60.4 gPO·kgcat−1·h−1 (PO selectivity of 10.2% and propylene conversion of 12.0%) at a lower temperature (250 °C). The characterization results indicate that Cu-doped LaCoO3 catalysts with enhanced oxygen vacancies and abundant electrophilic oxygen species are crucial to selectively attack on C═C bond instead of C–H bond. Besides, LaCoxCu1–xO3−δ catalysts demonstrated higher propylene conversion and more stable catalytic performance. This work exemplifies the direct propylene epoxidation with molecular oxygen employing perovskite materials.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2026
·
IF 5.9
Yanzhi Yang,Minghong Long,Xin Yu,Xiang Yang,Zhonghe Xu,Zhiyong Yan,Xuechun Xiao
A Novel Acid Etching–Induced Surface Reconstruction Strategy: Unlike conventional approaches that suffer from A-site cation (La 3+ ) surface enrichment, this work introduces a simple HNO 3 etching method to selectively remove surface La 3+ , thereby exposing more Co active sites and generating a LaCoO 3 /Co 3 O 4 heterojunction with significantly increased specific surface area. • Remarkably Enhanced Catalytic Performance for AP Thermal Decomposition: The optimally etched sample (LCO-AC40, etched for 40 min) lowers the high-temperature decomposition peak temperature (T HTD ) of ammonium perchlorate (AP) to 298.1 °C (a decrease of 24.5 °C compared to un-etched LaCoO 3 ), reduces the apparent activation energy from 210.3 kJ·mol −1 to 201.2 kJ·mol −1 . • Synergistic Mechanism of Co 3+ /Co 2+ and Oxygen Vacancies, with Improved Propellant Combustion: The etched surface features coexisting Co 2+ and Co 3+ alongside abundant oxygen vacancies, which collaboratively adsorb initial AP decomposition products and promote redox reactions. Studies have shown that the active sites of synthesized perovskite oxides are generally located at the B-site, but the outermost surface is preferentially occupied by A-site cations (e.g., La 3+ ) rather than B-site cations (e.g., Co 3+ ) which act as the main catalytic active centers, resulting in limited catalytic activity. Therefore, it is necessary to expose more Co sites to enhance the catalytic activity of perovskite oxides. In this work, LaCoO 3 precursors were prepared via the citric acid sol-gel method, and etched with 4% HNO 3 solution for 20, 40 and 60 min respectively to expose more Co active sites. The effects of etching treatment and different etching durations on the catalytic performance for ammonium perchlorate thermal decomposition were systematically investigated. The results demonstrate that the content of surface-exposed Co element can be effectively regulated by adjusting the HNO 3 etching duration. After etching, the Co 3 O 4 phase is generated in the sample and forms a heterojunction with LaCoO 3 , leading to a significant increase in specific surface area. The performance test results show that the un-etched LaCoO 3 reduces the high-temperature decomposition peak temperature ( T HTD ) of AP to 323.0 °C, and the thermal decomposition temperature of the etched samples further decreases. Among them, the sample etched for 40 min (LCO-AC40) has the best performance, reducing the T HTD of AP to 298.1 °C, and the apparent activation energy decreases from 210.3 kJ·mol −1 to 201.2 kJ·mol −1 , while the heat release is significantly increased. The mechanism study indicates that Co 2+ and Co 3+ coexist on the surface of the etched catalytic material, and the increase in Co 2+ content is accompanied by the generation of oxygen vacancies. Co 3+ and oxygen vacancies work together to adsorb the initial decomposition products of AP and promote redox reactions, thereby significantly advancing the thermal decomposition temperature of AP. The combustion test results show that adding LCO-AC40 to the AP/HTPB composite solid propellant makes the flame thicker and brighter, shortens the ignition delay time by 48 ms, and extends the steady-state combustion time. This study provides an effective way to optimize the catalytic performance of perovskite oxides through surface etching strategies and improve the combustion characteristics of composite solid propellants.
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Materials
·
2022
·Vol. 15
·期 12
·4149
·
IF 3.748
Yinghui Wang,Xiurong Guo,Danfeng Du,Shaochi Yang
Perovskite-type catalysts were widely used in the field of automobile exhaust purification due to their inherent physicochemical properties and excellent doping characteristics. A series of La1−xMxCo1−yNyO3(M = Ce, Ca; N = Fe, Mn) perovskite-type catalyst samples were prepared by sol-gel method for the four-way purification of PM, NOx, CO, and HC emitted by diesel exhaust. The activity of catalyst samples was tested by simulation experiments and hydrogen temperature-programmed reduction (H2-TPR). Catalyst samples were characterized by means of XRD, FT-IR, SEM, BET, and XPS analysis. The results demonstrated that the perovskite-type catalyst samples with a particle pore size of 3–5 μm can be prepared by sol-gel method. When A-site of LaCoO3perovskite-type oxide was doped by cerium ions, the catalyst samples produced small distortion. The doping of cerium ions to A-site was more conducive to the four-way purification of diesel exhaust than calcium ions. La0.8Ce0.2CoO3perovskite-type samples showed the best purification efficiency, and the purification efficiencies of PM, NOx, CO, and HC were 90%, 85%, 94%, and 100%, respectively. When the B-site of La0.8Ce0.2CoO3perovskite was doped with iron ions, the purification efficiency of catalyst samples for PM and NOxcan be further enhanced. When the B-site of La0.8Ce0.2CoO3perovskite was doped with manganese ions, the purification efficiency of the catalyst samples for PM can be further enhanced. It can be seen from the simulation experiments that La0.8Ce0.2Co0.7Fe0.3O3perovskite was the best doping amount, and the purification efficiencies of PM, NOx, CO, and HC were 95%, 92%, 94%, and 100%, respectively.Keywords:perovskite-type catalyst;diesel exhaust;sol-gel method;four-way purification;doping amount
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