ELECTROCHIMICA ACTA
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2015
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IF 4.504
Yue Dong,Wen-Long Zhang,Chun-Mei Wang,Ting Shi,Li Chen
Li 2 Mn 1 La x SiO 4 /C (x = 0, 0.01 and 0.04) composites are prepared via a polyol-assisted hydrothermal method followed by carbon coating. X-ray diffraction patterns confirm that the unit cell volume of Li 2 MnSiO 4 has been enlarged by doping a small amount of La 3+ . The scanning electron micrographs and elemental maps indicate that the sizes of the Li 2 MnSiO 4 particles can be reduced by homogeneously doping La 3+ . The transmission electron microscopy shows the well crystallized Li 2 MnSiO 4 nanoparticles. The electrochemical performances of all samples are evaluated by galvanostatic charge/discharge tests and electrochemical impedance spectroscopy. 1 at.% La 3+ doped Li 2 MnSiO 4 (AL1) delivers the highest initial discharge capacity of about 257 mAh g −1 , corresponding to the intercalation of about 1.55 lithium ions per formula unit. AL1 also exhibits improved capacity retentions of about 51.1%. The above improvements of electrochemical properties are related to the decreased charge transfer resistance and enhanced lithium ion diffusion for La-doped samples, whose crystal structure is maintained and lattice has been slightly enlarged.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2021
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IF 8.067
Fengnian Zhang,Fuhao Cheng,Chufei Cheng,Meng Guo,Yufeng Liu,Yang Miao,Feng Gao,Xiaomin Wang
Abatract A series of compositionally complex fluorite oxides (CCFOs) were prepared by ball milling the mixture of ZrO 2 , HfO 2 , Y 2 O 3 , La 2 O 3 , and Pr 6 O 11 followed by conventional solid-state sintering. Both XRD and TG-DSC results demonstrated that single-phase (Zr 0.2 Hf 0.2 Pr 0.2 Y 0.2 La 0.2 )O 2-δ was formed at 1400 °C. Elements in bulk ceramic were uniformly distributed without evident accumulation according to SEM-EDS pictures. TEM results revealed that polycrystalline ceramic powder was assignable to cubic Fm-3m fluorite structure. The electrical conductivity ( σ ) was measured via EIS technology and activation energy ( E a ) of CCFOs was calculated in Arrhenius plots. In the temperature range of 300-750 °C, CCFOs preserved the same conduction mechanism and (Zr 0.1667 Hf 0.1667 Pr 0.1667 Y 0.25 La 0.25 )O 2-δ possessed higher σ and lower E a than other high entropy fluorite oxides which is related to the incorporation of Pr element or the connection of cation-V o complex.
研究领域:
材料科学
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无机非金属材料
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固体离子学
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功能陶瓷
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能源材料
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
·Vol. 48
·期 47
·17957-17969
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IF 7.2
Wei Zhang,Dongliang Zhao,Jun Li,Zeming Yuan,Shihai Guo,Yan Qi,Yanghuan Zhang
Ball milling the powders of Mg-based alloys with transition metal compounds is effective for improving their hydrogen storage performances. In this experiment, the alloys of La 1.7 Y 0.3 Mg 16 Ni + x wt.% TiF 3 ( x = 0–10) were prepared through mechanical milling technology. XRD , SEM , HRTEM and granulometry were used to measure the composition and microstructure of alloys. The isothermal hydrogen storage property was measured by a Sievert apparatus. The results reveal that the TiF 3 additive in ball-milled samples transforms into MgF 2 and TiH 2 after the first hydrogen absorption . Adding TiF 3 enhances the crystallinity and reduces the average particle and crystallite sizes of alloys, which is beneficial to accelerating hydriding and dehydriding kinetics. Adding 7 wt% TiF 3 into alloy decreases the dehydrogenation activation energy from 72.2 to 64.0 kJ/mol and improves the hydrogen absorption rate at low temperatures, absorbing 3.50 wt% H in 0.5 min at 323 K.
研究领域:
材料科学
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氢能
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金属合金
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机械球磨
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JOURNAL OF CATALYSIS
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2018
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IF 6.759
Hong Zhang,Shuang Ni,Yongli Mi,Xiaoxiang Xu
Doping techniques generally serve as effective means for tailoring the physicochemical properties of a target compound. In this work, we successfully co-doped La/Fe into Ruddlesden-Popper (RP) compound Sr 2 TiO 4 and performed a detailed investigation on the crystal structure, morphology, optical absorption and photocatalytic hydrogen production reactions after doping. Our findings suggest that La/Fe co-doping slightly expand the unit cell of Sr 2 TiO 4 while maintains the structure lamination. Incorporating La/Fe into Sr 2 TiO 4 efficiently reduces the band gap and the level of band gap reduction can be controlled by varying the amounts of dopants. La/Fe co-doping significantly improves the photocatalytic properties of Sr 2 TiO 4 under both full range (λ ≥ 250 nm) and visible light illumination (λ ≥ 420 nm). A fivefold enhancement in hydrogen production rate (∼106.2 μmol/h) is seen in sample Sr 1.9 La 0.1 Ti 0.9 Fe 0.1 O 4 (x = 0.1). Efficient photocatalytic hydrogen production under visible light illumination (λ ≥ 420 nm) is also achieved in sample Sr 1.7 La 0.3 Ti 0.7 Fe 0.3 O 4 (x = 0.3) with AQE as high as ∼1.18% at 420 nm. DFT calculations confirm the critical role of Fe in reducing the band gap of Sr 2 TiO 4 by forming additional spin-polarized bands (SPB). The anisotropic charge transportation in Sr 2 TiO 4 is also verified by our calculations as both conduction band minimum (CBM) and valence band maximum (VBM) are buried in TiO 6 octahedron layers. The 2D charge transportation properties are particularly useful for photocatalytic reactions since interlayer charge recombination is essentially prevented.
研究领域:
材料科学
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光催化
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能源材料
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固态化学
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2023
·Vol. 106
·期 5
·2963-2971
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IF 3.9
Nan Weng,Ji Zhang,Jiajia Wang,Tianze Pan,Jing Wang,Yaojin Wang
Ceramic capacitors with high electrostatic energy storage performances have captured much research interest in latest years. Sodium bismuth titanate (Na 0.5 Bi 0.5 TiO 3 )-based ferroelectric ceramics show great potential due to their environment-friendly composition, high polarization, and excellent relaxor properties. However, the nonergodic relaxor state of Na 0.5 Bi 0.5 TiO 3 -based ceramics hampers the decrement of remanent polarization, leading to poor energy storage performance. Herein, the (1 − x )Na 0.5 Bi 0.5 TiO 3 – x La(Ni 2/3 Ta 1/3 )O 3 ceramics were designed to generate the transformation between nonergodic and ergodic relaxor state. As a result, the ceramics exhibit improved dielectric relaxation, slim polarization–electric field loops, and flattened current–electric field curves due to highly dynamic polar nanoregions. Particularly, the 0.85Na 0.5 Bi 0.5 TiO 3 –0.15La(Ni 2/3 Ta 1/3 )O 3 ceramics show large breakdown electric field E b (345 kV/cm), high recoverable energy density W rec (3.6 J/cm 3 ), and efficiency η (80.6%), revealing potential applications in electrostatic energy storage.
研究领域:
材料科学
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能源存储
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APPLIED SURFACE SCIENCE
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2026
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IF 6.6
Kailin Han,Liangmiao Zhang,Changzheng Pan,Hao Zeng,Yibo Xue,Fang Xia
Theory-experiment closed loop enables rational design of doped NiO electrochromics. • DFT screening identifies Y as the optimal dopant over La and Ce. • Y-doped NiO exhibits 50.6 % optical modulation and fast switching kinetics. • High coloration efficiency of 215.6 cm 2 ·C⁻ 1 is achieved experimentally. • Y-doped smart windows achieve 11.3 °C cooling, proving energy savings. Doping is an effective strategy to tailor NiO for high‑performance eletrochromic applications. In this work, first‑principles calculations reveal negative formation energies for Y (−5.83 eV) and La (−3.72 eV) in NiO, confirming spontaneous and stable doping. Experimentally, Y and La doping dramatically boost the charge storage capacity of crystalline NiO films. Most notably, at 500 nm, the Y‑doped (Y‑4) and La‑doped (La‑4) films achieve outstanding optical modulations of 50.6 % and 32.0 %, respectively. They far exceed the 8.3 % of undoped NiO‑400. The doped films also exhibit much faster switching kinetics: coloration/bleaching time of 4.2/6.1 s for Y‑doped and 8.0/4.3 s for La‑doped, compared to 7.0/6.5 s for undoped NiO. More importantly, they exhibit remarkably high coloration efficiencies of 215.6 and 262.0 cm 2 ·C −1 , respectively. After 1000 cycles, the Y‑doped film retains 88.0 % of its initial charge capacity, and the La‑doped film retains 90.7 %. Model house tests indicate their good thermal insulation performance for building applications. This strategy of integrating computational design with experimental validation provides a powerful and general approach to develop tailored doped‑NiO electrochromic materials and other advanced functional materials. Y(or La)-doped NiO electrochromic materials with high electrochromic properties was designed by first‑principles calculations and synthesis successfully. Download: Download high-res image (97KB) Download: Download full-size image
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ACS Sensors
·
2026
·
IF 10.9
Hongda Zhang,Liang Zhao,Yunpeng Xing,Chengchao Yu,Sihao Zhi,Teng Fei,Sen Liu,Haiyan Zhang,Tong Zhang
The tunable physicochemical properties of LaFeO3 show promise as a distinctive candidate for gas sensor applications. However, how to efficiently construct abundant active sites for LaFeO3 and clarify the sensing mechanism remains a challenge. Herein, we propose a modulating surface La vacancy strategy to improve the formaldehyde (HCHO) sensing performance of LaFeO3 by activating surface lattice oxygen. The LaFeO3 with abundant surface La vacancies was prepared by a urea-assisted sol−gel strategy (LFO-U-CA). The X-ray photoelectron spectroscopy (XPS) and inductively coupled plasma optical emission spectroscopy (ICP-OES) results indicate the formation of surface La vacancies, activating more surface lattice oxygen, supported by O2 temperature-programmed desorption (O2-TPD) and H2 temperature-programmed reduction (H2-TPR). Experimentally, LFO-U-CA exhibits a high response value of 4.2 toward 10 ppm HCHO (2.5 times higher than LFO-CA@1.7), low theoretical limit of detection (LOD) of 3.3 ppb, high selectivity, and high stability and can distinguish low-concentration HCHO in simulated indoor gaseous environments. Furthermore, the LFO-U-CA sensor shows a higher response value of 31.4 to 10 ppm HCHO in Ar, confirming surface lattice oxygen as the active species. Importantly, the formation of more surface La vacancies not only reduces the electron cloud density of Fe and O sites, promoting Fe 3d−O 2p orbital hybridization, thereby strengthening Fe−O covalency and activating surface lattice oxygen, but also induces the exposure of additional surface active sites (Fe sites and oxygen vacancies thus formed) for adsorption of HCHO and O2. This work provides a new strategy to design high-performance perovskite oxide-based gas sensors by modulating catalytic activity.
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高影响因子
Journal of Water Process Engineering
·
2026
·
IF 6.6
Zhengqi Liang,Xiongyan Gao,Yushan Li,Xu Liu,Boxing An,Yingying Zuo,Ling Wang,Jiahui Fu,Meili E
Staged modification significantly improved the adsorption capacity of BC. • The adsorption capacity of Zn-La@BC is 11.28 times that of the original BC. • Zn-La@BC retains 80% of its adsorption capacity after 5 cycles. • Zn-La@BC exhibits strong resistance to interference from low-valent ions. • Metal complexation and electrostatic interactions are the primary mechanisms. A Zn La co-doped reed biochar (BC) adsorbent was prepared using a staged optimization and a two-step bimetallic modification method to enhance its adsorption capacity for tetracycline hydrochloride (TC). The optimal process conditions for the Zn La co-doped biochar (Zn-La@BC) adsorbent were determined using the response surface method (BBD): Calcination at 300 °C for 120 min under N 2 protection with a Zn@BC to LaCl 3 mass ratio of 1:0.6. Maximum adsorption occurred at a pH of 9, a dosage of 0.20 g·L −1 , and a reaction temperature of 35 °C. Fitting the Langmuir model revealed a maximum adsorption capacity of 594.65 mg·g −1 , which is an 11.28-fold increase on pristine BC. This adsorbent exhibit strong resistance to low-valent ion interference, retaining 80% adsorption capacity after 5 cycles and demonstrating excellent cyclic stability. Its adsorption mechanism primarily involves metal surface complexation and electrostatic adsorption, supplemented by hydrogen bonding, π-π interactions, and pore filling. This study provides a novel approach for preparing high-capacity reed-derived BC adsorbents.
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ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19.9
Rendian Wan,Bing Li,Tenghui Yuan,Chaoxia Peng,Liuchen Wang,Bolin Xia,Peirong Chen,Ali Abdelhafiz,Xunhui Xiong,Enzuo Liu,Bote Zhao
Mn oxides are attractive earth-abundant catalysts for the acidic oxygen evolution reaction (OER). However, their durability is constrained by Mn overoxidation under high anodic potential. Here we demonstrate that dynamic La leaching can be harnessed to activate an oxygen-ligand-hole environment in Mn-based oxide (La 0.1 Mn 0.9 O x ), which suppresses Mn overoxidation. Ultraviolet-visible spectra of the electrolyte indicate that incorporating La into γ-MnO 2 shifts the onset potential for Mn VII O 4 − dissolution to a higher value. Operando spectroscopy reveals that La 0.1 Mn 0.9 O x exhibits a much more stable local MnO 6 framework than γ-MnO 2 under OER conditions. Theoretical analysis indicates that, upon Mn-site oxidation, La-leaching-induced metal vacancies amplify oxygen-ligand holes within distorted La─O─Mn motifs, enabling O-to-Mn charge compensation that suppresses Mn overoxidation. The electronic reconfiguration also modulates the Mn d -band center to optimize intermediate adsorption. La 0.1 Mn 0.9 O x delivers an overpotential 66 mV lower than that of γ-MnO 2 at 10 mA cm −2 geo , and sustains stable operation for 5000 h at 10 mA cm −2 geo and 1400 h at 100 mA cm −2 geo . This work highlights leaching-coupled oxygen-electronic regulation as an effective strategy for designing highly stable and active earth-abundant catalysts in acidic OER.
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BIORESOURCE TECHNOLOGY
·
2026
·
IF 8.2
Jin Ge,Zhaoshuang Li,Xu Xu,He Liu,Guoen Yang,Chuntao Kuang,Min Zhang,Zhenfei Yang,Yuanfeng Wei,Yiqiang Wu
Fe/La@MBC adsorbs PSNPs with a Langmuir capacity of 555 mg/g. • Fe/La@MBC maintains >98% removal in real-water matrices. • Magnetic recovery and pyrolysis regeneration retain 85% removal after 5 cycles. • DFT indicates O-containing groups strengthen Fe/La@MBC–PSNP interfacial binding. • Flow-through columns maintain >70% removal after 5 regeneration cycles. Nanoplastics (NPs) are emerging aquatic contaminants with high mobility, colloidal stability, and potential biological accessibility. However, many existing treatment methods mainly transfer captured NPs into a secondary solid phase, leaving NP-bearing residues that still require further handling. To address this issue, Fe-La-modified magnetic almond-shell biochar was prepared as a regenerable adsorbent that integrates nanoplastics capture, magnetic recovery, and pyrolysis-assisted regeneration. Among the prepared materials, Fe/La@MBC-1:1 exhibited the best overall adsorption performance toward polystyrene nanoplastics (PSNPs), with a Langmuir maximum capacity of 555 mg/g. Stable removal behavior was maintained under varying water chemistry conditions and in real-water matrices. Additional tests further showed effective removal at lower PSNPs concentrations and across different particle sizes, surface functionalities, and selected nanoplastic types. The adsorption behavior was associated with enhanced interfacial interactions between Fe/La@MBC-1:1 and nanoplastics, including electrostatic attraction and van der Waals forces. After five adsorption-pyrolysis regeneration cycles, the removal efficiency remained at 85% in batch adsorption and above 70% after the fifth regeneration cycle in flow-through column operation. These results indicate that Fe/La@MBC-1:1 provides a feasible biochar-based route for integrated nanoplastics capture, magnetic recovery, and pyrolysis-assisted regeneration. Download: Download high-res image (145KB) Download: Download full-size image
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高影响因子
COMPOSITE STRUCTURES
·
2026
·
IF 7.8
Junyi Mao,Hui Pan,Shilong Xue,Ting Zhang,Haijiao Xu,Changhong Luo,Hailan Jin
Rubber-based functional materials frequently exhibit deficiencies in mechanical strength, tensile properties, self-healing efficiency, and sensing capabilities. This study employed oxidized natural rubber (ONR) as a matrix, integrating lipoic acid (LA) and cellulose nanofibers (CNFs) to establish a dynamic cross-linked network characterized by dynamic disulfide bonds and multiple hydrogen bonds. Coating the surface with ONR/LA/CNFs/CNT to create a conductive layer enables the detection of both minor and significant deformations. A flexible strain sensor was developed, demonstrating precise detection capabilities for various deformations, a high elongation at break of 419.58 %, moderate tensile strength of 1.72 MPa, and a gauge factor (GF) of 17.07.The sensor displays structural stability and responsiveness, along with a self-repair rate of 95.93 % within 0.5 h at 80 ℃, thereby ensuring durability and reliability. It effectively monitors human movement signals, presenting a promising solution for sustainable and repairable smart wearable devices.
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Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2026
·
IF 5.7
Yingyun Li,Ruizhu Li,Na Gao,Tao Li,Jian-Qiang Wang,Guoping Xiao
Sluggish catalytic activity and long-term stability of oxygen electrode materials are the main challenges in the commercialization of solid oxide fuel cells (SOFCs). Herein, a Ruddlesden-Popper-structured Pr 2-x La x NiO 4+δ (PLxN) by A-site lanthanum doping are investigated to enhance catalytic activity and stability of oxygen electrodes. Interestingly, the PL 0.1 N electrode exhibits low polarization resistance of 0.090 Ω cm 2 at 800 °C, with 18.18% reduction compared to PNO. Furthermore, the Pr 1.9 La 0.1 NiO 4+δ in anode-supported single cells exhibit peak power density of 1.468 W cm −2 at 800 °C and good operational stability over 100 h. Thereinto, La-doping induces lattice expansion and charge redistribution, which enriches surface active sites and accelerates oxygen reduction reaction kinetics. Overall, trace La-doping serving as an A-site defect engineering provides an efficient design strategy for high performance SOFC cathodes.
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