RARE METALS
·
2020
·Vol. 40
·期 7
·1753-1761
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IF 2.161
Li Jiang-Wei,Song Qi,Li Jiang-Bing,Yang Sheng-Chao,Gao Yan-Shan,Wang Qiang,Yu Feng
Abstract For better performances of Ni-based catalysts at low temperatures, Ni/SiC catalyst doped with a little amount of additive La was successfully prepared. The catalytic CO methanation activity tests showed that 3%La–Ni/SiC catalyst was excellent at a low reaction temperature (95.9% CO conversion and 85.1% CH 4 selectivity at 250 °C) with a superior stability compared with Ni/SiC (3.4% CO conversion and 0% CH 4 selectivity at 250 °C). This can be attributed to that the addition of La can markedly improve the dispersibility of active metal Ni and reduce the particle sizes of Ni nanoparticles or clusters, and can also regulate the interaction between active components and supports. Moreover, the high thermal conductivity and thermal stability could avoid the generation of hot spots in the catalyst bed. These results will promote the development of highly active Ni-based catalysts for the low-temperature methanation reaction. Graphic Abstract
研究领域:
催化
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化学工程
·
材料科学
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DOI
高影响因子
Chem Catalysis
·
2026
·
IF 10.7
Yuan Yuan,Xitang Qian,Shiyuan Liu,Weiwei Chen,Minglei Lu,Ernest Pahuyo Delmo,Yan Zhang,Yao Yao,Yuxiang Lyu,Yushen Liu,Dong Su,Minhua Shao
Efficient electrocatalytic nitrogen oxidation reaction (eNOR) requires promoting N 2 activation while minimizing the competing oxygen evolution reaction (OER). A compartmentalized La-ZnO core-shell electrocatalyst is constructed to mimic cellular functional segregation. The crystalline ZnO shell acts as a selective interface that enriches N 2 and limits OH − adsorption, thereby reducing the OER current. Beneath the shell, a porous amorphous oxygen-deficient core exposes dynamically accessible undercoordinated Zn–O–La sites. These sites promote stabilization of key intermediates, including ∗N 2 O 2 − , and support stepwise conversion after N 2 adsorption activation and oxidation. This spatial separation lowers the overall energetic demand along the 10-electron NOR pathway in alkaline electrolyte. The electrocatalyst reaches a Faradaic efficiency of 40.4% and a nitrate yield rate of 11.9 μmol mg −1 h −1 .
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高影响因子
Journal of Energy Storage
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2026
·
IF 10.7
Yu-Han Yuan,He-Jie Wu,Jia Liang,Hai Huang,Gui-Fang Li,Jin-Wei Yan,Shuang-Lin Cai,Yong-Qi Ye,Ye Zeng,Ming-Ming Tao,Xiao-Hong Fan,Yi Li,Ding-Rong Deng,Qi-Hui Wu
Driven by the global push for sustainable energy, supercapacitors are regarded as competitive energy storage systems. Nevertheless, boosting their energy density and cycling durability remain core challenges. Herein, a La 2 O 3 /Al 2 O 3 heterostructure (La-Al-O) is in-situ fabricated on nickel foam (NF) via a hydrothermal route. Electrochemical activation converts crystalline La 2 O 3 into amorphous La 2 O 3 , triggering structural reconstruction: interwoven nanosheet networks evolve into loose, crumpled nanosheets. This transformation enriches oxygen vacancies and generates Ni(OH) 2 on NF to create abundant ion-accessible active sites, while Al 2 O 3 serves as a structural stabilizer against framework collapse (activated La-Al-O, abbreviated A-La-Al-O). In terms of electrochemical performance, the A-La-Al-O/NF electrode exhibited a high specific capacitance of 4.60 F·cm −2 at a current density of 5 mA·cm −2 . After 20,000 cycles at a scan rate of 20 mA·cm −2 , the cycle retention rate was 75.7%. For the assembled asymmetric device (denoted as A-La-Al-O/NF/activated carbon (AC)), an energy density of 49.41 Wh·kg −1 was achieved at a power density of 889.38 W·kg −1 , with a cycle retention rate of 82.5% after 20,000 cycles. This study adopts method combining hydrothermal and electrochemical activation without the need for binders, featuring a simple and convenient process. It provides a new insight for the high-value utilization of rare earths and the development of high-performance supercapacitors.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Binghao Wang,Yuzhi Zhang,Xinyu Wang,Jiayu Ma,Lingnan Wu,Changchun Chen
La-based perovskite oxides with configurational entropy increasing from low to high, namely LaMnO 3 , La(Mn 0.5 Fe 0.5 )O 3 , La(Mn 1/3 Fe 1/3 Co 1/3 )O 3 , La(Mn 0.25 Fe 0.25 Co 0.25 Ni 0.25 )O 3 , and La(Mn 0.2 Fe 0.2 Co 0.2 Ni 0.2 Cu 0.2 )O 3 , were synthesized by a solid-state reaction method, and their phase evolution, microstructure, and infrared (IR) radiation properties were systematically investigated. X-ray diffraction and transmission electron microscopy reveal that increasing configurational entropy at the B-site induces a structural transformation from R-3c to Pm-3m and eventually back to a stabilized R-3c phase in the five-component system, accompanied by lattice distortion and suppressed elemental segregation. Room-temperature spectral emissivity measurements show that the R-3c phase exhibits superior IR emission compared to the Pm-3m phase in the 2-8 μm range. Notably, at elevated temperatures (600-900 °C), the emissivity of LMFCNCO increases with temperature, reaching 0.910 at 900 °C, while the binary oxide LaMnO 3 exhibits a marked decline. X-ray photoelectron spectroscopy indicates that the high entropy design promotes mixed-valence states of B-site cations and a high concentration of oxygen vacancies, which enhance small-polaron hopping and carrier absorption at high temperatures. This work demonstrates that entropy engineering is an effective strategy for tailoring the high temperature infrared radiation performance of perovskite ceramics, offering promising candidates for thermal management and energy conversion applications.
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Materials
·
2026
·Vol. 19
·期 7
·1370
·
IF 3.7
Yi Luo,Nan Li,Lingjing Yang,Jinlong Wei,Yuantao Yang,Wentao Wang,Yang Zhao,Ruidong Xu,Xuanbing Wang
The high energy consumption of lead anodes in zinc production is caused by the slow oxygen evolution reaction (OER). We made a La-Mn co-doped β-PbO2anode using electrodeposition to solve this issue. The XRD and XPS results show that adding La shrinks the lattice and changes the electron structure. This helps Mn4+change into active Mn3+and creates more active oxygen on the surface, making the reaction easier. EIS tests show that the charge transfer resistance (Rct) decreased by 4.2 times, decreasing from 147.6 Ω to 34.72 Ω at 1.0 V. The Bode phase peak also moved to a lower frequency (from 122 Hz to 0.215 Hz), proving that the electrochemically active surface area (ECSA) increased significantly. At the industrial current of 50 mA cm−2, the anode shows a low overpotential of 840 mV and a Tafel slope of 265 mV dec−1. This improved performance saves 187.10 kWh of energy per ton of zinc. Therefore, the LaMn-β-PbO2anode is a promising and energy-saving option for industrial zinc production.
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DOI
PubMed
高影响因子
Materials Chemistry Frontiers
·
2025
·Vol. 9
·期 7
·1189-1204
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IF 6.4
Bing Wang,Yao Liu,Hong Hao,YuZhen Zhao,ZeMin He,WenQi Song,EnZhou Liu,Zhuo Li,ZongCheng Miao
Metal ion doping is an effective strategy to improve the charge carrier separation pathways in semiconductors. In this study, La3+ ions were introduced into Ag3PO4via an in situ co-precipitation method, forming p-type doped LaxAg3−xPO4 without altering the original cubic morphology of Ag3PO4. The introduction of La3+ led to a reduction in the band gap, an expansion of the light absorption range, and an increase in electron localization. Density functional theory (DFT) calculations revealed that La doping introduces new states within the band gap, facilitating energy transitions and altering the electronic structure. Time-dependent DFT (TDDFT) calculations confirmed that the introduction of La3+ enables photoexcited electrons to predominantly migrate from Ag 4d and O 2p orbitals to La 4d and P 2p orbitals. This key finding unveiled the anti-photocorrosion mechanism of LaxAg3−xPO4. Free radical capture experiments and electron paramagnetic resonance (EPR) analysis demonstrated that La doping enhances the electron migration efficiency in LaxAg3−xPO4, promoting the conversion of ˙O2− to ˙OH radicals. This study not only provides an innovative approach for the application of La-doped Ag3PO4 in environmental pollutant catalysis but also reveals a novel internal electron transfer pathway and the underlying mechanism for enhanced photocatalytic activity.
研究领域:
材料科学
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环境科学
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理论化学
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DOI
高影响因子
Science China-Materials
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2024
·
IF 6.8
He Xun,Xie Ting,Dong Kai,Nan Jue,Sun Hang,Yao Yongchao,Fan Xiaoya,Zheng Dongdong,Luo Yongsong,Sun Shengjun,Liu Qian,Li Luming,Chu Wei,Xie Lisi,Kong Qingquan,Sun Xuping
Electrocatalytic reduction of nitrate (NO 3 − ) can efficiently transform NO 3 − into ammonia (NH 3 ), enabling the simultaneous removal of NO 3 − pollutant from wastewater and the production of NH 3 . Here, we report the use of rare-earth lanthanum-doped Co 3 O 4 nanowires array on carbon cloth (La-Co 3 O 4 /CC) as an efficient electrocatalyst for the conversion of NO 3 − to NH 3 . The as-synthesized La-Co 3 O 4 /CC demonstrates a remarkable NH 3 Faradaic efficiency (96.36%) and NH 3 yield (537.44 µmol h −1 cm −2 ), markedly surpassing its Co 3 O 4 counterpart (87.78%, 279.4 µmol h −1 cm −2 ). Theoretical computations unveil that the incorporation of La doping promotes NO 3 − adsorption and optimizes the hydrogenation process, thus enhancing the electroreduction activity of Co 3 O 4 in NO 3 − conversion and NH 3 selectivity. Furthermore, a Zn–NO 3 − battery incorporating La-Co 3 O 4 /CC achieved a peak power density of 9.86 mW cm −2 . This work advances the application of Co 3 O 4 -based electrodes in electrocatalysis and highlights the effectiveness of rare earth element doping in NO 3 − reduction reactions.
研究领域:
环境科学
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电化学
·
材料科学
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DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Jingbo Sun,Xudong Zheng,Youming Zhu,Lin Guo,Xuan Ma,Xinmiao Pan,Xiang Gu,Jinfeng Mei,Jian Rong,Zhongyu Li
Under the imperative of a circular economy, the efficient recovery of rare earth elements (Lanthanum) from secondary resources is paramount. To overcome the shortcomings of traditional powder adsorbents, such as easy agglomeration and difficult separation, phosphorylated layered double hydroxides (P-LDH) were prepared and immobilized onto the matrix of delignified wood aerogel (WA) to fabricate phosphorylated layered double hydroxide-modified wood aerogel (P-LDH/WA). By intercalating phosphate anions into the interlayer of LDH, specific La(III) chelating sites were assigned to it. The WA substrate retains the renewability of wood and provides a framework with a hierarchical porous structure that can efficiently load P-LDH nanoparticles. Research has shown that the adsorption process of P-LDH/WA follows PSOKM (R2 > 0.992), confirming the dominant role of chemical adsorption. When pH = 7.0, P-LDH/WA exhibits excellent La(III) adsorption performance, which is more in line with the Langmuir model (R2 > 0.991). The maximum adsorption capacity reaches 58.26 mg g–1, significantly better than WA (22.10 mg g–1), And maintain an adsorption efficiency of 81.3% after 3 regeneration cycles, with reusability. Thermodynamic analysis shows that the adsorption process is spontaneous (ΔG° < 0) and endothermic (for P-LDH/WA, ΔH° = 3.77 kJ/mol), indicating that the adsorption capacity increases with increasing temperature. P-LDH/WA combines high capacity, easy separation, and reusability to efficiently recover lanthanum(III) from secondary resources.
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Rongyao Wang,Shengnan Su,Xiaohua Ren,Weilin Guo
In this work, a series of La-doped NiFe-layered double hydroxides containing a novel Keggin type polyoxometalate interlayer (NiFeLa{HPW}-LDH) were synthesized and initially applied as heterogeneous catalyst for peroxymonosulfate (PMS) activation. Characterizations indicated that polyoxometalate anions were successfully intercalated in the layers of NiFeLa-LDH. Experiment results showed that NiFeLa{HPW}-LDH exhibited better catalytic performance than the counterpart precursor. The influences of various experimental parameters, such as pH value, initial TC concentration, HPW intercalation content, catalyst loading and peroxymonosulfate concentration were investigated in detail. Quenching experiments and the results of electron paramagnetic resonance (EPR) demonstrated the SO 4 − and HO were the dominant reactive radicals engaging in the degradation process. Furthermore, the formation of a complex of Ni(II)/Fe(II)/La(III)−(HO)OSO 3 − and the succeeding redox cycle of Ni(II)/Ni(III)/Ni(II), Fe(II)/Fe(III)/Fe(II), La(III)/La(IV)/La(III) were responsible for the generation of active radicals via activating PMS. Meanwhile, it's worth noting that the intercalated HPW also played a vital role in electron transfer.
研究领域:
环境科学
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催化
·
材料科学
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DOI
高影响因子
ACS ES&T Water
·
2024
·
IF 4.8
Fanglin He,Yuhang Cao,Yehang Wu,Hang Chen,Fu Huang,Ming Chang,Chaohai Wei,Guanglei Qiu
Effective and sustainable removal of low-concentration phosphate is imperative but challenging for advanced wastewater treatment. Additionally, an eco-friendly and cost-effective treatment and reuse of waste activated sludge is critical. To address these problems, sludge-biochar-based phosphate adsorbents were developed by pyrolyzing waste activated sludge and then functionalizing with Ca–La layered double hydroxide (LDH). The LDH’s structure and adsorption characteristics were optimized by substituting the intercalated ion CO32– with NO3–. A maximal phosphorus adsorption capacity of 78.24 mg of P/g was achieved. Adsorption kinetics showed that 0.2 g/L functionalized sludge biochar effectively lowered PO43––P concentration from 7.0 to <0.02 mg/L within 2 h. The functionalized sludge biochar showed desirable phosphate (7 mg/L) selectivity toward coexisting anions such as sulfate (120 mg/L) and carbonate (250 mg/L), resulting in barely impacted adsorption capabilities. After 4 repetitive adsorption-regeneration experiments, 65.1% adsorption capacity remained. The functionalized sludge biochar was used to remove phosphate from a local wastewater treatment plant. The PO43––P concentration effectively decreased from 1.29 to <0.02 mg/L within 1 h. The promising selectivity and stability of the functionalized sludge biochar are due mostly to selective chemisorption, ion exchange, and phosphate complexation in the inner layer.
研究领域:
环境科学
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废水处理
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材料科学
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2026
·Vol. 61
·期 12
·7950-7967
·
IF 4.4
Feng Changjian,Yang Hongkai,Huang Lilan,Lv Lin,Li Jiao
In this study, a La-doped flexible hydrophobic Al 2 O 3 fiber membrane was fabricated via electrospinning technology, and the influence of La doping on the mechanical properties and surface wettability of the Al 2 O 3 fiber membrane was systematically investigated. The results showed that the La-doped modified alumina nanofiber membrane has tunable fiber diameters (180–480 nm) and a highly interconnected porous network, which enhanced the efficiency and flux of oil–water separation. The incorporating an appropriate amount of rare earth La atoms, specifically at a La/Al atomic ratio of 0.125 (La-Al 2 O 3 -2), effectively enhanced the flexibility and tensile strength of the membrane. Concurrently, hydrophobic La 2 O 3 formed on the fiber surface, which transformed the membrane from hydrophilic to hydrophobic. As a result, the La-doped Al 2 O 3 membrane exhibited excellent anti-fouling performance, high permeation flux, and efficient oil–water separation. However, excessive La addition led to a significant decline in the flexibility and tensile strength of the Al 2 O 3 fiber membrane, whereas the hydrophobic surface was largely preserved. Among all samples, the La-Al 2 O 3 -2 fiber membrane exhibited superior flexibility and tensile strength. In oil–water separation applications, it achieved a high permeation flux of 2921 L/(m 2 ·h) and a separation efficiency of 98.4%; meanwhile, the good reusability was also obtained. Graphical abstract
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·Vol. 50
·期 9
·15172-15181
·
IF 5.1
Shan Gao,Peng Yang,Xinjian Li,Wenting Ji,Haidong Yu,Yaqi Chen,Yuewen Zhang,Hongan Ma,Xiaopeng Jia
SrTiO 3 (STO) is considered a promising high-temperature N-type thermoelectric material . However, its intrinsic insulating properties and high thermal conductivity limit the dimensionless quality factor (zT) due to its simple crystal structure and the existence of light elements. Along these lines, in this work, the optimization of the thermoelectric properties of STO-based materials was achieved by using the high temperature and high pressure (HPHT) method and adjusting the doping ratios of the La and Nb heavy elements . To enhance the doping effect, oxygen vacancies need to be formed within the sample. For this reason, titanium powder was added to the sample. Due to the confined environment induced by the high pressure, which can be attributed to the application of the HPHT method and the strong oxygen trapping ability of Ti at high temperatures, a reducing environment was attained for the samples, the latter, promoted the formation of oxygen vacancies in the synthesized samples, and semiconducting properties were achieved. The thermoelectric properties and microscopic morphology of the synthesized samples with different doping ratios of La and Nb were also thoroughly investigated. Finally, the maximum zT value obtained for the samples was 0.28@973 K. A fast, simple, and effective method for the preparation of oxygen-deficient packet-crystalline oxide materials was developed in this work, which paves the way for significantly improving their thermoelectric properties.
研究领域:
材料科学
·
热电学
·
陶瓷
·
固体物理
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高影响因子
危险品化学品经营许可证（带存储）