NANO
·
2025
·
IF 1.1
Yi Gou,Jinghong Du,Zilong Wang,Shengyang He,Jiahao Lv
La 3+ single-doped and La 3+ -Mo 6+ co-doped TiO 2 nanotubes were synthesized via anodic oxidation combined with a two-step electrochemical process. Their crystalline structure, microstructure, and light absorption properties were characterized using XRD, SEM, and UV-Vis spectroscopy, followed by methylene blue photocatalytic degradation experiments. The results indicate that both La 3+ single-doping and La 3+ -Mo 6+ co-doping can suppress the transformation of the anatase phase to the rutile phase and inhibit grain growth. The diameters of both types of nanotubes range between 60-80 nm, with La and Mo uniformly distributed throughout the nanotubes. Both La 3+ single-doped and La 3+ -Mo 6+ co-doped induced red shifts in the TiO 2 light absorption peaks. The most pronounced red shift in the light absorption band edges occurred at a La 3+ -Mo 6+ ratio of 3:7, reducing the bandgap width to its minimum value of 2.99 eV. Both La 3+ single-doped and La 3+ -Mo 6+ co-doped TiO 2 exhibited first-order photocatalytic degradation of methylene blue. As the La 3+ single-doped concentration increased or the La 3+ -Mo 6+ co-doped ratio varied from 1:9 to 9:1, both the methylene blue degradation rate and photocatalytic reaction rate initially increased before decreasing, while the half-life initially decreased before increasing. At a La 3+ -Mo 6+ co-doped ratio of 3:7, the photocatalytic activity of the TiO 2 nanotubes was optimal, achieving a maximum degradation rate of 89.73% within 8 hours-a 52% improvement over pure TiO 2 nanotubes.
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高影响因子
LANGMUIR
·
2025
·
IF 3.9
Xiaohua Wang,Yanwei Li,Guang Sun,Jianliang Cao,Yan Wang
Recently, because of the urgent need for safety and health protection, there has been a growing focus on exploring effective and feasible gas sensors based on metal oxide semiconductors (MOSs) for detecting trace levels of hydrogen sulfide (H2S). In this context, a cobalt (Co) doping strategy was proposed to improve the H2S-sensitive properties of In2O3 nanomaterials, enabling them to monitor 1 ppm of H2S at a relatively lower temperature. The Co-doped In2O3 hierarchical porous nanocubes (Co–In2O3 HPNCs) were prepared through a hydrothermal route using In(OH)3 as a precursor. When utilized as a sensing material to detect H2S, the Co–In2O3 HPNCs demonstrated significant enhancements compared to pure In2O3. These enhancements include a reduction in the operating temperature (260 vs 300 °C), a significant increase in response (36.99 vs 12.28 for 20 ppm of H2S), and better selectivity (13.21 vs 3.07 times to ethanol). Even to 1 ppm of H2S, the Co–In2O3 sensor can give a response value of 1.86, highlighting its substantial potential for detecting H2S at the limit of detection (LOD) of 1 ppm. A detailed analysis of the multiple sensitization effects of Co doping reveals that these improved H2S sensing characteristics of Co–In2O3 HPNCs can be primarily traced back to three factors, namely, an increased oxygen vacancy concentration, a narrowing of the bandgap, and an upward shift of the Fermi level.
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PubMed
高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 11
·792
·
IF 4.3
Xuan Liu,Jie Chao,Feifei Guo,Liangliang Chang,Xinyang Zhang,Wei Long,Zengzhe Xi
Addressing the limitations of poor piezoelectric photocatalytic activity and insufficient magnetic recovery in pure BiFeO 3 nanoparticles, Gd and Zr co-doped BiFeO 3 nanoparticles were synthesized via the sol-gel method. The structural characterization revealed a rhombohedral-to-orthorhombic phase transition with reduced grain size (~35 nm) and lattice distortion due to dopant incorporation. An XPS analysis confirmed Fe 3+ dominance and oxygen vacancy enrichment, while optimized BGFZ9 exhibited enhanced remanent magnetization (0.1753 emu/g, 14.14 increase) compared to undoped BFO. The synergistic piezo-photocatalytic system achieved 81.08% Ofloxacin degradation within 120 min (rate constant: 0.0136 min −1 , 1.26 higher than BFO) through stress-induced piezoelectric fields that promoted electron transfer for ·O 2 − /·OH radical generation via O 2 reduction. The Ofloxacin degradation efficiency decreased to 24.36% after four cycles, with structural integrity confirmed by XRD phase stability. This work demonstrates a triple-optimization mechanism (crystal phase engineering, defect modulation, and magnetic enhancement) for designing magnetically recoverable multiferroic catalysts in pharmaceutical wastewater treatment.
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PubMed
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2025
·Vol. 131
·期 6
·504
·
IF 2.8
Zheng Xiuxin,Gong Lin,Zou Zhengguang,Xie Zhuojia
In this paper, La 0.7 Sr 0.15 Ca 0.15 Mn 0.95 A 0.05 O 3 (A = Fe, Co and Ni) were fabricated via the sol–gel (S-G) approach. The samples are all rhombohedral structure shapes and belong to the trigonal space group R-3c, as shown by XRD. ZEISS Gemini SEM 300 scans showed irregular sub-micron particles with decreasing particle size for La 0.7 Sr 0.15 Ca 0.15 Mn 0.95 A 0.05 O 3 (A = Fe, Co and Ni). The magnetic properties were characterized utilizing an MPMS, and the magnetocaloric effects (MCE) were further investigated. The investigations of La 0.7 Sr 0.15 Ca 0.15 Mn 0.95 A 0.05 O 3 (A = Fe, Co and Ni) found that their Curie temperatures (Tc) were 289.5 K, 290.2 K, and 300 K, respectively. The maximum magnetic entropy change ( \(-\Delta {S}_{M}^{max}\) ) for La 0.7 Sr 0.15 Ca 0.15 Mn 0.95 A 0.05 O 3 (A = Fe, Co and Ni) at 5 T is 5.107 J/(kg∙K), 4.177 J/(kg∙K) and 3.852 J/(kg∙K), and the relative cooling power ( RCP ) is 264.819 J/kg, 275.3409 J/kg and 288.7435 J/kg. The Arrott curve, normalization and Curie–Weiss law (CW) fit together to determine that the second-order ferromagnetic-to-paramagnetic (FM-to-PM) transition is observed in the three samples, along with a small magnetic hysteresis and thermal hysteresis, the super-exchange interactions (SE) and the double-exchange interactions (DE) competed with each other to increase half peak width and RCP , with La 0.7 Sr 0.15 Ca 0.15 Mn 0.95 A 0.05 O 3 (A = Ni) having the largest RCP . While conventional low-temperature magnetic materials need to work in a liquid helium environment, room-temperature magnetic materials do not need to rely on extreme cooling conditions, which greatly reduces the cost of refrigeration equipment, and thus room-temperature magnetically cooled materials have a greater potential for research and development. In this paper, Ni is used as the doping element, and its RCP can reach 288.7435 J/kg, and its Tc is close to room temperature, so it is possible to be used as a room-temperature magnetic cooling material.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Yanqiu Liu,Mengtian Wang,Jingbo Mao,Hui Lv,Jinxia Zhou
It is of significant importance to develop cost-effective transition metal catalysts for the hydrogenation of glucose to sorbitol. While Ni-based catalysts have been frequently reported, investigations involving Co-based catalysts in this reaction remain relatively limited. Here, a Co catalyst supported on a coconut-shell activated carbon (AC) was prepared and utilized for the first time to produce sorbitol from glucose via aqueous hydrogenation. Characterization results revealed that the Co components were highly dispersed on the AC surface, forming CoO–Co polyvalent complexes incorporating oxygen vacancies and Lewis acids after calcination in N2 at 500 °C. In contrast, Ni species on the AC surface tend to aggregate into metallic Ni particles. Compared with Ni/AC, the Co/AC catalyst not only demonstrates a superior ability to generate more active H with multiple forms, but also possesses various strengths of Lewis acid sites to activate the CO bond of glucose. Consequently, the Co/AC catalyst exhibited higher activity with 100% selectivity towards sorbitol in the aqueous hydrogenation of glucose under mild conditions of 100 °C and 3 MPa H2 pressure, showcasing significant potential for the formation of sorbitol from biomass-derived glucose due to its low cost, simple preparation process, and excellent performance in hydrogenation.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Shanxin Li,Zhiqi Zhai,Yijing Sun,Sichen Guo,Ting Peng,Hongying Yu,Xuzhou Jiang
The development of stealth materials with both efficient corrosion resistance and low-frequency microwave absorption is highly necessary. In this work, neural-structured Co@C/MWCNTs nanocomposites were successfully synthesized through a facile co-precipitation method, followed by a subsequent pyrolysis process. By adjusting the pyrolysis temperature, the pore structure, crystallinity, degree of graphitization, and electromagnetic parameters of the material were optimized. This optimization achieved a multi-mechanism synergistic effect in the low-frequency region (C-band), including impedance matching, dielectric loss, conductive loss, and magnetic loss. The results indicated that NCN-700 achieved a minimum reflection loss ( RL min ) of −64.31 dB at 4.88 GHz. Additionally, the neural-structured Co@C/MWCNTs nanocomposites exhibited significant effectiveness in low-frequency radar stealth applications, while also displaying superior corrosion resistance, self-corrosion potential ( E corr = 0.52 V), and self-corrosion current density ( I corr = 2.58 × 10 −6 A/cm 2 ). These findings suggest the promising potential for neural-structured Co@C/MWCNTs nanocomposites in applications related to low-frequency microwave absorption and corrosion protection.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Chunying Liu,Li Lv,Kun Liu,Junsu Jin,Jianguo Mi,Yongqiang Ren,Shisen Xu
By coupling CALF-20 on ZIF-7 via in situ crystallization in the confined micrometer-sized pores of poly(acrylates), a novel composite, namely, CALF-20-on-ZIF-7@poly(acrylates), has been synthesized for the simultaneous removal of CO2 and H2S from IGCC feed gas. Within this coupled crystal, CALF-20, known for its strong adsorption capacity and excellent stability toward CO2 and H2S, serves as the outer layer crystal to shift the adsorption/desorption hysteresis loop of inner ZIF-7 to beyond atmosphere pressure. Under high pressure, CO2 and H2S are automatically adsorbed. Upon reducing the pressure to the atmospheric level, CO2 is automatically released, while H2S remains temporarily due to its high adsorption energy. After about 150 cycles of CO2 adsorption/desorption of the kilogram-scale composite, H2S approaches saturation and is then removed by vacuuming. Since the content of H2S in IGCC feed gas is trivial, the total energy consumption for the composite regeneration is 0.16 MJ/kg (CO2). After 600 consecutive cycles, the CO2 adsorption capability of the composite decreases by 0.41%, demonstrating excellent cyclic stability.
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高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2018
·
IF 3.046
Ting Wang,Qing Ma,S.-H. Song
Pure and Ba-Zr co-doped multiferroic BiFeO 3 nanopowders are synthesized via sol-gel method. X-ray diffraction demonstrates the transformation of crystal structure (from R3c to R3c + P4mm) and the absence of impurity phase. Scanning electron microscopy and transmission electron microscopy indicate that the co-doping leads to a decrease in particle size and the Bi 0.85 Ba 0.15 Fe 0.95 Zr 0.05 sample has a particle size of 30–60 nm. Surprisingly, the room-temperature magnetization hysteresis loops change to be soft ferromagnetic with co-doping. The maximum and remnant magnetizations of the as-prepared nanopowders first increase and then decrease with increasing dopant concentration with the Bi 0.85 Ba 0.15 Fe 0.95 Zr 0.05 sample having the best magnetic properties. The enhanced magnetization is due to the crystal lattice distortion caused by the ionic-radius difference between the substituent and host elements and the suppression of the antiferromagnetic spiral spin structure induced by the size effect of the nanopowders.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2019
·
IF 4.029
Kang Qian,Yubai Pan,Zewang Hu,Xiaopu Chen,Yun Shi,Xin Liu,Haohong Chen,Martin Nikl,Jiang Li
SrHfO 3 :Ce and SrHfO 3 :Ce,Al powders were prepared by the solid-state synthesis using the commercial HfO 2 , SrCO 3 , CeO 2 and α-Al 2 O 3 as the starting materials. All the SrHfO 3 :Ce and SrHfO 3 :Ce,Al powders calcined at different temperatures within 1100 °C–1300 °C for 8 h in air exhibited a pure SrHfO 3 phase. Meanwhile, the effects of different calcination temperatures and co-doped alumina on the microstructure of SrHfO 3 :Ce,Al powders were discussed. SrHfO 3 :Ce and SrHfO 3 :Ce,Al ceramics were successfully fabricated via the vacuum sintering at 1800 °C for 20 h. The alumina acted as the sintering aid, which promoted the densification and eliminated the intragranular pores of SrHfO 3 :Ce,Al ceramics. The charge disbalance was effectively compensated by co-doped alumina. SrHfO 3 :Ce,Al ceramics exhibited a higher light yield of 5700 ph/MeV compared with 4600 ph/MeV obtained in SrHfO 3 :Ce ceramics. The charge traps in ceramics and their effects on scintillation properties were also investigated by thermoluminescence measurement.
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高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Chao Huang,Biao Zhang,Yang Luo,Dezhi Xiao,Kaiwei Tang,Qingdong Ruan,Yixuan Yang,Biao Gao,Paul K. Chu
Low-cost, environmentally friendly, and efficient electrocatalysts are required for large-scale and commercial generation of O 2 and H 2 by the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). Herein, composites composed of Co and carbon nanotubes (Co NPs@CNT) are fabricated by one-step chemical vapor deposition (CVD) using commercial Co nanoparticles and benzene as precursors. In the alkaline medium, Co NPs@CNT exhibits a small overpotential of 380 mV at a current density of 10 mA cm −2 , small Tafel slope of 82.2 mV dec −1 , and excellent structural and electrochemical durability and the properties are better than those of most previously reported Co-based electrocatalysts and commercial Co nanoparticles. The CNTs not only provide high conductivity, but also decrease the adsorption energy of OH* on the surface of Co NPs@CNT. The small energy barrier is responsible for the enhanced OER performance of Co NPs@CNT. In addition to the revelation of the synergistic effects between Co and CNTs, our results provide insights into the development of metal-carbon electrocatalysts and the simple and effective strategy described here has large commercial potential.
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高影响因子
CHEMICAL PHYSICS LETTERS
·
2020
·
IF 2.029
Jiaqin Liu,Chen Zhou,Wenzhe Yue,Bo Yan,Yichao Lin,Aisheng Huang
A facile and green template-free hydrothermal method was conducted to controllably synthesize spinel type cobalt oxides (Co 3 O 4 ) with cube, truncated octahedron and octahedron morphologies. The catalytic performance over various shapes of catalysts was investigated towards CO oxidation. Among of them, the Co 3 O 4 cube performs the best catalytic activity, which can even be comparable to those of certain noble metal catalysts. The phenomenon might be ascribed to the synergistic effects of exposed Co 3+ active sites and surface oxygen distribution on the surface of the catalyst. The results may provide significant insights for the fabrication of metal oxide catalysts for CO oxidation .
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Ruinan Wang,Shuang Ni,Gang Liu,Xiaoxiang Xu
In this work, we have applied microstructure management and doping techniques to conventional wide band gap semiconductor CaTiO 3 with the aim to improve its light absorption and photocatalytic activity. A series of La/Cr co-doping hollow CaTiO 3 cubes have been successfully prepared by a template-free hydrothermal method. Their crystal structures, microstructures, optical absorption and photocatalytic hydrogen production have been systematically investigated. Our results suggest that hollow CaTiO 3 owns a higher light absorption than solid one and demonstrates a much better photocatalytic activity both under full range (λ ≥ 250 nm) and visible light illumination (λ ≥ 400 nm). These improvements probably originate from the peculiar hollow microstructures that increase photon-matter interactions and shorten the charge migration pathways. The photocatalytic activity for hydrogen production has been further studied by varying the La/Cr content in CaTiO 3 . An optimal doping point at 5% La/Cr doping level has been reached for full range illumination with apparent quantum efficiency approaching ∼2.41%. Nevertheless, the activity under visible light illumination shows a clear dependence on doping level with highest apparent quantum efficiency ∼0.40% at 20% La/Cr doping level. DFT calculations reveal the critical role of Cr in forming a new spin-polarized valence band inside the original band gap of CaTiO 3 therefore is responsible for band gap reduction and visible light photocatalysis. This work here highlights the importance of microstructure control to the photocatalytic performance and shall shed a light on the design and development of efficient photocatalytic materials/systems.
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高影响因子
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