Advanced Powder Materials
·
2026
·
IF 26.8
Minghao He,Zhenghui Tian,Rui Zhang,Yang Qu,Guofeng Wang
A B S T R A C T The key for photocatalytic CO 2 reduction in pure water lies in constructing active sites that possess both rapid charge transfer and efficient CO 2 adsorption. Here, atomically dysprosium (Dy)-cobalt (Co) dual sites anchored g-C 3 N 4 (CN) microtube were successfully fabricated by a precoordination-thermopolymerization strategy, in which Co 2+ and Dy 3+ ions are selectively coordinated with melamine and cyanuric acid, respectively, prior to thermal polymerization. The optimized Co 1 Dy 1 /CN catalyst delivers a CO yield of 240.55 μmol·g −1 and a CH 4 yield of 68.70 μmol·g -1 in pure water without sacrificial agents, representing ∼8.0-fold and ∼4.6-fold enhancements over pristine CN, respectively, superior to most reported single-atom photocatalysts. According to femtosecond transient absorption spectroscopy, theoretical calculation, and in situ techniques, the superior catalytic activity originates from the synergistic interaction between Dy and Co dual active sites. Specifically, Dy-possessing abundant unoccupied 4f orbitals-functions as an electron reservoir that facilitates directional electron transfer toward the Co sites, accelerating charge extraction by 8.4-fold and enhancing electron transfer kinetics by 1.5-fold. This electron enrichment at the Co centers induces a downshift in the Co d -band center, which further strengthens CO 2 adsorption and activation at the Co sites with inherent CO 2 affinity. In this paper, resent the lanthanide-empowered strategy to overcome charge dynamics limitations in cobalt single-atom catalysts. Dysprosium serves as an atomic electron reservoir adjacent to cobalt sites in dual sites centers, enabling synergistic CO2 reduction. Multimodal analysis (XAS, in situ spectroscopy, fs-TA, and DFT) reveals Dysprosium to cobalt electron transfer and d-band center optimization mechanisms. Download: Download high-res image (269KB) Download: Download full-size image
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高影响因子
Industrial Chemistry & Materials
·
2024
·
IF 0
Jiayao Cui,Junyong Min,Hao Wang,Jianglan Shui,Lishan Peng,Zhenye Kang,Jieyuan Liu,Qingjun Chen,Shuo Bai,Yanrong Liu
Developing single-atom Fe–N4/C catalysts is crucial for the large-scale implementation of proton exchange membrane fuel cells (PEMFCs). While Fe–N4/C catalysts are inherently active in accelerating the slow ORR process, their performance is still inferior to that of Pt/C. Herein, a trace Co-doped Fe single-atom catalyst (Fe(tCo)–N–C) containing more active Fe2N8 sites has been synthesized. Interestingly, compared with typical FeN4 sites in an Fe–N–C electrocatalyst, the Fe2N8 sites generate a larger Fe–N bond length due to Co-doping. The elongated Fe–N bond in Fe2N8 lowers the d-band center and charge density of iron sites, enhancing the ORR process by facilitating the formation of *OOH and generation and desorption of *OH. Fe(tCo)–N–C manifested excellent acidic and alkaline ORR activity, with a half-wave potential (E1/2) of 0.80 V in HClO4 solution and 0.89 V in KOH medium. More importantly, high peak power densities (Pmax) were realized by applying Fe(tCo)–N–C in PEMFCs, with the Pmax reaching 890 mW cm−2 in H2–O2 and 380 mW cm−2 in H2–air. Additionally, trace Co dopants in the catalyst improved carbon graphitization and provided high ORR catalytic stability. This research introduces an innovative approach to engineering highly active Fe2N8 sites, providing valuable insights for the sustainable progress of PEMFC technology.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 6
·1-11
·
IF 2.8
Zhang Zhengyu,Yang Yujie,Chen Congliang,Chen Dongyang,Zhang Yingming,Meng Yuting,Li Hao
In this study, Ni–Zn–Co ferrite doped with (Al 3+ ) was synthesized by solid-phase synthesis method and its structure was analyzed. By analyzing the X-ray diffraction (XRD) data, it was explained that the Ni 0.45 Zn 0.40 Co 0.15 Fe 2-x Al x O 4 (0 ≤ x ≤ 0.15) ferrite has a single-spinel structure with FD-3 m space group. Additionally, by analyzing the XRD data, it is found that the lattice constant is the largest when Al 3+ is undoped. The range of lattice constant is (8.3751 ~ 8.3900) Å, the range of saturation magnetization ( M s ) is (68.77 ~ 79.39) emu/g, and the range of coercivity ( H c ) is (9.04 ~ 13.10) Oe. When the content of Al 3+ is 0.09, the permeability reaches the highest. In conclusion, the results obtained indicate that this ferrite is suitable for low-frequency electronic devices and also confirm that Fe 3+ was successfully replaced with Al 3+ . This paper provides a new idea for the study of spinel-structured ferrites by doping Al 3+ .
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高影响因子
IONICS
·
2024
·Vol. 30
·期 4
·2287-2298
·
IF 2.4
Lin Jie,Ding Yihong,Jin Huile,Zeng Tianbiao
The development of inexpensive, highly effective and durable electrocatalysts for hydrogen production via water electrolysis is of paramount importance. Transition metal oxides, owing to their simplicity in preparation and cost-effectiveness, have been widely investigated, particularly cobalt, nickel, and manganese oxides. Inspired by the synergies of the ternary cathode materials of lithium-ion batteries (LiNi x Mn y Co 1- x - y O 2 , NMC), a simple and feasible method was used to prepare a graphite plate as the support, and Ni and Mn were co-doped with Co 3 O 4 as an efficient water decomposition catalyst. Experimental studies indicated that the 10% Ni and 10% Mn co-doped Co 3 O 4 (Co 2.4 Ni 0.3 Mn 0.3 O 4 , CNM-811) exhibited the lowest overpotential in the oxygen evolution reaction (OER), with CNM-811 achieving an overpotential of 338 mV at 30 mA cm −2 in NaOH aqueous solution, the Tafel slope is 79.71 mV dec −1 . In the hydrogen evolution reaction (HER), an overpotential of 190 mV was attained at 10 mA cm −2 . In overall water splitting, a cell voltage of 2.048 V was achieved at 100 mA cm −2 , which was superior to many analogous catalysts reported today.
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高影响因子
Frontiers of Optoelectronics
·
2023
·Vol. 16
·期 1
·1-11
·
IF 5.4
Zhang Chuancheng,Ding Shoujun,Wang Miaomiao,Ren Hao,Tang Xubing,Zou Yong,Dou Renqin,Liu Wenpeng
Optical thermometry based on the upconversion (UC) luminescence intensity ratio (LIR) has attracted considerable attention because of its feasibility for achievement of accurate non-contact temperature measurement. Compared with traditional UC phosphors, optical thermometry based on UC single crystals can achieve faster response and higher sensitivity due to the stability and high thermal conductivity of the single crystals. In this study, a high-quality 5 at% Yb 3+ and 1 at% Ho 3+ co-doped Gd 0.74 Y 0.2 TaO 4 single crystal was grown by the Czochralski (Cz) method, and the structure of the as-grown crystal was characterized. Importantly, the UC luminescent properties and optical thermometry behaviors of this crystal were revealed. Under 980 nm wavelength excitation, green and red UC luminescence lines at 550 and 650 nm and corresponding to the 5 F 4 / 5 S 2 → 5 I 8 and 5 F 5 → 5 I 8 transitions of Ho 3+ , respectively, were observed. The green and red UC emissions involved a two-photon mechanism, as evidenced by the analysis of power-dependent UC emission spectra. The temperature-dependent UC emission spectra were measured in the temperature range of 330–660 K to assess the optical temperature sensing behavior. At 660 K, the maximum relative sensing sensitivity ( S r ) was determined to be 0.0037 K −1 . These results highlight the significant potential of Yb,Ho:GYTO single crystal for optical temperature sensors. Graphical abstract
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高影响因子
Journal of Superconductivity and Novel Magnetism
·
2022
·Vol. 36
·期 1
·327-341
·
IF 1.675
Li Pengwei,Li Jie,Wang Yonglun,Yao Kai,Shan Shuo,Suo Xing,Ma Saisai
Praseodymium (Pr)–aluminum (Al)-co-doped M-type barium ferrite with Ba 0.85 Pr 0.15 Fe 12-x Al x O 19 ( x = 0.0–1.0) was prepared by combining solid-phase sintering with high-energy ball milling. The samples were characterized using a thermogravimetric analyzer, X-ray diffractometer, field emission scanning electron microscopy, Fourier transform infrared spectroscopy, and vibrating sample magnetometer. Thermogravimetric analysis indicated that M-type barium ferrite was formed at 1250 °C. X-ray diffraction patterns showed that Al doping did not destroy the crystal structure of barium ferrite. Field emission scanning electron microscopy showed that the samples had a hexagonal crystal structure. The wave numbers of Fourier transform infrared spectroscopy in the 597–607 and 452–459 cm −1 bands represent tetrahedral and octahedral clusters, respectively. With the increase in the amount of Al doping ( x ) from 0.0 to 1.0, the saturation magnetization ( M s ) and residual magnetization ( M r ) decreased continuously, and the magnetic anisotropy field ( H a ) and coercivity ( H c ) increased significantly.
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高影响因子
Frontiers in Energy
·
2023
·Vol. 18
·期 1
·110-121
·
IF 2.9
Ge Yang,Shen Quanhao,Zhang Qi,Li Naixu,Lu Danchen,Zhang Zhaoming,Fu Zhiwei,Zhou Jiancheng
Metal-free graphitic carbon nitride (g-C 3 N 4 ) has captured significant attention as a low-cost and efficient hydrogen production photocatalyst through. Effectively regulating the microstructure and accelerating the separation of photogenerated carriers remain crucial strategies for promoting the photocatalytic performance of this material. Herein, a novel sulfur–carbon co-doped g-C 3 N 4 (SCCN) hierarchical microtubules filled with abundant nanosheets inside by thermal polymerization is reported. Numerous nanosheets create abundant pores and cavities inside the SCCN microtubes, thereby increasing the specific surface area of g-C 3 N 4 and providing sufficient reactant attachment sites. Besides, the hierarchical structure of SCCN microtubules strengthens the reflection and scattering of light, and the utilization of visible light is favorably affected. More importantly, co-doping S and C has greatly improved the photocatalytic performance of graphitic carbon nitride, optimized the band gap structure and enhanced the photogenerated carrier splitting. Consequently, the SCCN exhibits a remarkable photocatalytic H 2 evolution rate of 4868 µmol/(g·h). This work demonstrates the potential of multi-nonmetal doped g-C 3 N 4 as the ideal photocatalyst for H 2 evolution.
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高影响因子
CARBOHYDRATE POLYMERS
·
2015
·
IF 4.074
Jifei Cui,John F. Kennedy,Jun Nie,Guiping Ma
Amines monomers, N , N -dimethylaminoethyl methacrylate (DMAEMA), N , N -dimethylethanolamine (DMEA), 2-dimethylaminoethylamine (DMEDA) and N -methiyldiethanolamine (MDEA) were used to induce the formation of calcium carbonate (CaCO 3 ) crystals on chitosan films, by using (NH4) 2 CO 3 diffusion method at ambient temperature. The obtained CaCO 3 particles were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD) and Energy dispersive spectroscopy (EDS). The influence of reaction variables, such as the additive concentration and their types were also investigated on the products. The morphologies of CaCO 3 crystals, inter-grown in cube-shape, were controlled by DMAEMA and DMEA. It was observed that the morphologies of CaCO 3 changed from the cube grown arms to massive calcite with a hole on the face by increasing the concentrations of DMEDA and MDEA. While the precipitation grew on chitosan film without any organic additive, only single cube-shaped crystals were obtained. By these results the possible mechanisms can be proposed that electronic movement of the groups on the monomer effected ions configuration and molecules absorbed on the exposed surface, resulted the change of the surface energy, which caused the change in the morphology of CaCO 3 .
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jingxian He,Zhen Jiang,Yuan Liu,Zhenfeng Jing,Shuhui Sun,Haixia Zhang,Fengqing Zhang
This study successfully synthesized bismuth ferrite (BFO) thin films co-doped with europium (Eu) and aluminum (Al) using the sol-gel method, while comprehensively investigating their performance characteristics. By systematically adjusting the Al doping ratio in Bi 0.98 Eu 0.02 Fe1 -x Al x O 3 (with x = 0, 0.01, 0.03, 0.05, 0.07), significant changes in the material properties were observed. XRD and Raman spectroscopy validated the presence of R 3 c and Pnma phases in the synthesized BFO thin films, which demonstrated excellent crystallinity. Microstructural and compositional assessments, performed using SEM and XPS, indicated that the BEFAO5 sample possessed high crystallinity and a relatively low oxygen vacancy content. These characteristics enhanced the exceptional current-voltage (J-V) properties and ferroelectric behavior of BEFAO5. Additionally, the influence of vacancy defects on the ferroelectric efficiency and durability of BFO ferrite thin films was examined. The results indicated that the co-doping approach significantly improved the material's resistance to aging. In summary, the combined doping of Eu and Al not only substantially modified the crystalline structure and physical attributes of BFO thin films but also markedly enhanced their potential for applications in energy storage and spintronic technologies.
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DOI
高影响因子
Processes
·
2025
·Vol. 13
·期 9
·2854
·
IF 2.8
Min Wang,Chunjing Yu,Xiaoyu Zhao,Junhao Liu,Haochen Zhai,Meng Qi,Xiumei Zhang,Yinsong Liu
Microbial-enhanced oil recovery (MEOR) is a promising technology for oilfield development. To improve MEOR efficiency, two functional strains—Bacillus mucilaginosus ZZ-8 and Bacillus amyloliquefaciens ZZ-11—were isolated and purified. The growth characteristics, biosurfactant production, and crude oil emulsification performance of these strains were systematically evaluated through single-strain cultures and a co-culture system (ZZ-8: ZZ-11 = 1:1). The results demonstrated that the co-culture system exhibited superior growth and functional performance compared to monocultures. The cell-free supernatant significantly reduced oil–water interfacial tension, decreasing the contact angle from 53.56 ± 1.3° to 28.78 ± 0.82°, thereby enhancing crude oil detachment from rock surfaces and improving oil displacement efficiency. Gas chromatography (GC) analysis further confirmed the co-culture system’s pronounced degradation of long-chain alkanes (C17–C35). In oil sand washing experiments, the 1:1 mixed-strain fermentation broth achieved a crude oil elution rate of 84.39%, representing an 89.80% increase over uninoculated medium. This study not only validates the synergistic effect of the B. mucilaginosus–B. amyloliquefaciens co-culture system in enhancing oil recovery but also provides a theoretical foundation and innovative strategy for its practical application in MEOR technology.
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高影响因子
Microstructures
·
2025
·Vol. 5
·期 3
·N
·
IF 9
Kaiwen Tian,Yukang Fu,Inzimamul Haq,Shuangyang Kuang,Gaojie Xiong,Zeyuan Zhao,Tianyu Zhou,Jun Weng,Xiang Peng,Liwei Xiong
Aim: Zinc oxide (ZnO) is an n-type semiconductor with a wide bandgap, excellent electron mobility, and stable chemical characteristics, making it potentially applicable in the field of gas sensing. However, conventional ZnO-based gas sensors face challenges such as high operating temperatures and low sensitivity.Methods: In this paper, we first synthesized ZIF-8 with a rhombic dodecahedron structure using a room-temperature chemical precipitation method. By doping ZIF-8 with cobalt (Co) and exchanging gold ions, followed by calcination in air, we obtained a metal-organic framework (MOF) derived porous Au@Co-ZnO nanostructure.Results: This nanostructure retained the large specific surface area and porous characteristics of ZIF-8, while its gas sensing performance was significantly enhanced compared to the pure MOF-derived ZnO nanostructure, due to Co doping and gold nanoparticle modification. At an ethanol concentration of 100 ppm, the Au@Co-ZnO sample demonstrated its best performance at 140 °C, with a response value of 205.3. This result was 28.9 times higher compared to the pure ZnO sample, which showed a response value of 7.1 under identical conditions. Additionally, the optimal operating temperature was 40 °C lower than that of the pure ZnO sample (180 °C). Furthermore, the Au@Co-ZnO samples demonstrated good stability and selectivity for ethanol gas.Conclusion: The proposed MOF-derived porous Au@Co-ZnO nanostructures not only advance the application of MOF-derived materials in gas detection but also offer a novel approach for boosting the gas-sensing performance of other metal oxide materials.
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产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Feihong Yang,Weiwei Li,Peng Luo,Jing Cheng,Laiming Chen
Transparent Yb:CaF 2 ceramics have recently emerged as a promising ultra-fast laser medium with broad emission bandwidth, long lifetime and suitable thermal properties. However, Yb 3+ clustering in the CaF 2 host strongly influences the performance of these materials as solid-state laser gain media, and mitigating this clustering remains a challenge. Herein, we introduced Y 3+ and Gd 3+ buffer ions simultaneously for the first time to modulate the fluorescence properties of transparent Yb:CaF 2 ceramics and explore the effect of Y 3+ and Gd 3+ ions co-doping on the optical quality and microstructure of the ceramics. It was found that transmittance in the short wavelength was improved and fluorescence properties could be modulated to a larger extent compared to single buffer ion doping. This finding establishes the correlation between the double buffer ions doping and the fluorescence properties in transparent Yb:CaF 2 ceramics, and may lead to innovative techniques of transmitting enhancement, as well as its ultrafast laser applications.
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高影响因子
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