ACS Applied Nano Materials
·
2022
·
IF 6.14
Le Zhang,Xin Zhou,Shaohua Chai,Jian Guan,Guijun Fan,Wuxinchen Yang,Guojun Ma,Ning Han,Yunfa Chen
There is a high demand to synthesize ozone decomposition catalysts especially in high-space-velocity and high-relative-humidity (RH) environments. Herein, two polymorphs of cobalt hydroxide, α- and β-Co(OH)2, are synthesized and applied for ozone elimination. β-Co(OH)2 shows ∼90% ozone decomposition efficiency under high space velocity (weight hourly space velocity (WHSV) = 1,200,000 mL g–1 h–1, 25 °C, 40 ppm), which is far higher than that of α-Co(OH)2 (∼5%). β-Co(OH)2 has high spin Co(II) in distorted octahedral coordination caused by the Jahn-Teller effect, leading to a higher crystal field splitting energy level and thus contributing to the easier electron transfer between the ozone and catalyst. Moreover, β-Co(OH)2 still shows high performance (∼87%) even in humid conditions (RH ∼50%, 25 °C, 40 ppm, WHSV = 600,000 mL g–1 h–1), which is attributable to its abundant surface non-hydrogen-bonded hydroxyls weakening water molecule adsorption, providing an idea to develop highly efficient catalysts for ozone decomposition in humid environments.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2014
·Vol. 18
·期 7
·2027-2033
·
IF 2.234
Chen Dongrui,Li Benzhen,Liao Youhao,Lan Hongwei,Lin Haibin,Xing Lidan,Wang Yating,Li Weishan
Three samples, LiNi 0.5 Mn 1.5 O 4 , LiNi 0.4 Mn 1.4 Co 0.2 O 4 , and LiNi 0.4 Mn 1.4 Cr 0.15 Co 0.05 O 4 , were prepared by sol–gel method and characterized by powder X-ray diffraction, Fourier transformed infrared spectroscope, scanning electron microscopy, Brunauer–Emmett–Teller surface area, four-probe resistance, cyclic voltammetry, electrochemical impedance spectroscopy, and charge–discharge test. It is found that the co-doped sample LiNi 0.4 Mn 1.4 Cr 0.15 Co 0.05 O 4 exhibits an improved performance compared with the Co-doped sample LiNi 0.4 Mn 1.4 Co 0.2 O 4 and the undoped sample LiNi 0.5 Mn 1.5 O 4 , especially at elevated temperature. At 25 °C, the discharge capacity of LiNi 0.4 Mn 1.4 Cr 0.15 Co 0.05 O 4 is 130 mAh g −1 at 0.1 C and 103 mAh g −1 at 10 C. At an elevated temperature (55 °C), its 1 C discharge capacity is 136 mAh g −1 and maintains 95.6 % of its initial capacity after 100 cycles. Compared with the reported results of LiNi 0.4 Mn 1.4 Co 0.2 O 4 and LiNi 0.475 Mn 1.475 Co 0.05 O 4 , the co-doped sample LiNi 0.4 Mn 1.4 Cr 0.15 Co 0.05 O 4 , with least content of Co, 0.05, possesses not only the high C-rate capacity but also the structural stability. The mechanism on the electrochemical performance improvement of LiNi 0.5 Mn 1.5 O 4 by the co-doping was discussed.
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Scientific Reports
·
2015
·Vol. 5
·期 1
·1-8
·
IF 5.578
Niu Xiaoyu,Zhao Tieying,Yuan Fulong,Zhu Yujun
The hollow CuO@SiO 2 spheres with a mean diameter of 240 nm and a thin shell layer of about 30 nm in thickness was synthesized using an inorganic SiO 2 shell coating on the surface of Cu@C composite that was prepared by a two-step hydrothermal method. The obtained hollow CuO@SiO 2 spheres were characterized by ICP-AES, nitrogen adsorption-desorption, SEM, TEM, XRD, H 2 -TPR, CO-TPR, CO-TPD and NO-TPD. The results revealed that the hollow CuO@SiO 2 spheres consist of CuO uniformly inserted into SiO 2 layer. The CuO@SiO 2 sample exhibits particular catalytic activities for CO oxidation and NO + CO reactions compared with CuO supported on SiO 2 (CuO/SiO 2 ). The higher catalytic activity is attributed to the special hollow shell structure that possesses much more highly dispersed CuO nanocluster that can be easy toward the CO and NO adsorption and the oxidation of CO on its surface.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Tan Hu,Yang Xu,Gang Xu
Self-assembling dipeptide hydrogels are attracting attention in food, materials, and biomedicine. However, there are still limitations such as weak hydrogel properties. Herein, we introduced two types of polysaccharides (Arabic gum and citrus pectin) into an alkyl-chain modified dipeptide (C 13 -tryptophan-tyrosine (C 13 -WY)) to generate co-assembled C 13 -WY-arabic gum and C 13 -WY-pectin hydrogels. The co-assembled hydrogels exhibited enhanced mechanical properties and stability. The G' value of C 13 -WY-arabic gum and C 13 -WY-pectin hydrogels was 3 and 10 times larger than that of C 13 -WY hydrogel, respectively. The addition of Arabic gum and citrus pectin led to the co-assembly and molecular rearrangement. Moreover, co-assembled hydrogels showed more β-sheet structure and hydrogen bonds. Importantly, the self-/co-assembled hydrogels showed low cytotoxicity. We utilized these hydrogels for the encapsulation of docetaxel and they showed a high embedding rate and slow-release. Our findings provide a novel strategy for the development of stable supramolecular peptide hydrogels with good biocompatibility through simple co-assembly.
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DOI
PubMed
高影响因子
Nano Energy
·
2021
·
IF 17.881
Dongdong Li,Qian Zhang,Zhichuan Shen,Kumar Siddharth,Lijuan Chen,Minhua Shao,Zhicong Shi
Rechargeable lithium oxygen batteries (LOBs) are one of the most promising energy storage systems by virtue of their high energy density and environmental amiability. However, the development of LOBs is still hindered by some critical issues. Herein, 3D hexapod-shaped Co-ZIFs-thiourea/dimethyl sulfoxide (H-Co-ZIFs-S) derived Co nanoparticles embedded into nitrogen and sulfur co-doped carbon (H-Co-NSC) are developed, and then low content of ruthenium nanoparticles are decorated on the surface to obtain Ru/H-Co-NSC as efficient catalyst for LOBs. The Ru/H-Co-NSC catalysts exhibits unique structure and catalytic properties , such as accommodating the insoluble discharge product Li 2 O 2 , promoting the transportation of ions/O 2, enhancing the electronic conduction, demonstrating excellent OER/ORR kinetics as well. In addition, the Ru-decorated nanoparticles could effectively suppress some side-reactions caused by the exposed carbon of H-Co-NSC in LOBs. First-principles Density functional theory (DFT) calculations reveal the cooperative effect of multiple active sites in Ru/H-Co-NSC can effectively promote the ORR/OER kinetics in LOBs. Therefore, the LOBs with Ru/H-Co-NSC cathode provide a positive catalytic capacity with low overpotential, large specific capacities, long cycle life and superior reversibility . Our work may pave the way to design more advanced catalysts for metal-air batteries with superior electrochemical performance.
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ACS Sustainable Chemistry & Engineering
·
2026
·Vol. 14
·期 27
·12026-12036
·
IF 7.6
Zhong Haojia,Liu Hongchen,Yang Fan,Sun Xinyang,Gao Fuming,Zhang Xiaona,Wei Kexin,Wang Kuobo,Li Shijia,Li Zhenxing,Wang Chunxia,Li Yongfeng
Copper-based electrocatalysts demonstrate significant potential for electrochemical CO 2 reduction toward value-added chemicals. However, achieving selective synthesis of multi-carbon (C 2+ ) products on copper-based catalysts remains a substantial challenge. In this study, a Cu 2 O electrocatalyst (Mg 0.1 -Cu 2 O-SC) doped with magnesium (Mg) and surface-modified by sodium citrate (SC) was successfully synthesized via a simple wet chemical reduction method. The Mg 0.1 -Cu 2 O-SC achieves a Faradaic efficiency (FE) of 77.8% and a partial current density of 357.9 mA cm −2 for C 2+ products, which is 1.35 times higher than the FE of unmodified Cu 2 O. Mg 0.1 -Cu 2 O achieves an enhancement in the FE for CO, demonstrating that the Lewis-acidic Mg weakens the bond strength of Cu−*CO and enhances the local concentration of *CO by attracting electrons from Cu. In situ spectroscopic analysis reveals that the surface modification of SC facilitates the *CO to *CHO hydrogenation, which shifts the C−C coupling to a more favorable *CO−*CHO route with a lower-energy barrier and consequently improves the FE for C 2+ products. Theoretical calculations indicate that the electron-withdrawing effect of Mg induces a downward shift in the copper d-band center. Energy barrier analyses reveal that SC effectively lowers the energy barriers for both the water dissociation reaction and the *CO−*CHO coupling reaction. This work confirms that Mg effectively modulates the adsorption behavior of key intermediates and synergistically optimizes the reaction pathway in concert with SC.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Jinlin Hu,Haojie Zhang,Simeng Xia,Yishu Cai,Zhou Shi,Lin Deng
The widespread occurrence of carbamazepine (CBZ) in aquatic environments necessitates efficient water treatment technologies. This study developed a cobalt-doped iron oxychloride (Co-FeOCl) catalyst via a facile calcination method to activate peracetic acid (PAA) for enhanced degradation of CBZ. The incorporation of Co into the FeOCl structure dramatically boosted the catalytic performance, with 0.5Co-FeOCl exhibiting superior activity compared to pristine FeOCl. The 0.5Co-FeOCl/PAA system achieved an apparent rate constant of 0.039 min⁻ 1 , 19.5 and 5.6 times higher than that of the PAA alone (0.002 min⁻ 1 ) and FeOCl/PAA (0.007 min⁻ 1 ) systems, respectively. Mechanistic investigations revealed that the degradation was primarily driven by organic radicals (CH 3 C(O)OO• and CH 3 C(O)O•) and high-valent metal species (Co(IV) and Fe(IV)). The Co doping established synergistic Fe(II)/Fe(III)-Co(II)/Co(III) redox cycles, effectively accelerating the rate-limiting Fe(III) reduction step and facilitating continuous generation of reactive species. XPS analysis confirmed an increased surface Fe(II) content after reaction, supporting this synergistic mechanism. Density functional theory (DFT) calculations proved that Co sites exhibit superior adsorption capacity for PAA compared to Fe sites on three main facets. This work not only presents 0.5Co-FeOCl as a highly efficient and stable catalyst for PAA activation but also provides fundamental insights into the synergistic mechanisms in bimetallic/PAA systems for remediating refractory organic pollutants.
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JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2026
·Vol. 56
·期 6
·107
·
IF 3.7
He Xinkuai,Liu Jie,Guo Ruqing,Chen Xu,Zeng Genfa,Wang Yuxin,Wu Junhui,Du Jingjing,Wu Luye
The hygroscopic nature of ethylene glycol (EG) can induce spontaneous fluctuations in water content throughout anhydrous EG media. However, the residual water content may affect metal electrodeposition process in the EG media. Therefore, this study elucidates water content effect on Co(II) reduction process and cobalt electrocrystallization mechanism. Compared with those in anhydrous EG, the Co(II) electrochemical reduction mechanism and the metallic cobalt electrocrystallization mechanism in EG containing various water contents remain unchanged. Co(II) reduction follows one-step irreversible reaction. However, varying water content can modify some reduction characteristics such as nucleation overpotential, peak potential, peak current density, and kinetic irreversibility in the EG-H 2 O system. Cobalt nucleation follows a typical diffusion-controlled mechanism and demonstrates the three-dimensional instantaneous growth behavior. Additionally, adding water to anhydrous EG can alter the Co(II) transport mechanism and interface reaction kinetics, and lead to the occurrence of adsorption phenomena that do not occur in anhydrous EG. Importantly, with increasing water content, the charge transfer resistance of Co(II) decreases gradually. The kinetic control can transition from electrochemical polarization at low overpotentials to mixed diffusion/charge-transfer control at high overpotentials. Water content exhibits a negligible effect on the composition of cobalt deposits, but a significant effect on their microstructure. These findings collectively demonstrate that the role of water in the cobalt electrodeposition process cannot be ignored in EG-based electrolytes, and controlling the water content can precisely regulate the cobalt coatings microstructure. This work provides a simple and efficient method for precisely controlling material microstructure.
Section
Graphical
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DALTON TRANSACTIONS
·
2026
·
IF 3.3
Mishal Iftikhar,Sadegh Ghorbanzadeh,Wei Zhang
Tb3+/Gd3+-codoped BiF3 nanoparticles were synthesized via a controlled, room-temperature co-precipitation method to address the critical challenge of low photoluminescence (PL) quantum efficiency in singly Tb3+-doped fluoride phosphors. Structural analysis confirmed a stable cubic phase (Fmm) with successful substitutional doping on Bi3+ sites. At the optimal 5 : 5 mol% Tb : Gd ratio, a quantum yield of 13.5%—a fourfold enhancement over Tb3+-only systems—was achieved. The mechanism of enhancement operates through two complementary, excitation-wavelength-dependent pathways: (I) Under short-UV irradiation (230–260 nm), Gd3+ acts as a sensitizer—harvesting photons via its 8S7/2 → 6IJ/6PJ transitions and transferring energy to Tb3+ via resonance Gd3+ → Tb3+ energy transfer, directly proven by excitation spectroscopy. (II) Under 365 nm excitation—where Tb3+ is the primary absorber and Gd3+ absorbs negligibly—Gd3+ enhances PL efficiency through a complementary crystal field modification mechanism: Gd3+ substitution modifies the local phonon environment around bulk Tb3+ sites, reducing the non-radiative depopulation rate of the 5D4 excited state. This is directly evidenced by time-resolved PL decay showing +65% and +87% elongation of Tb3+ bulk lifetime components (τ2 and τ3) upon co-doping. CIE chromaticity analysis confirms high-purity green emission. These findings provide dual-mechanism characterization of Gd3+/Tb3+ co-doping in BiF3, establishing a rational design framework for Gd3+-enhanced lanthanide phosphors.
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 16
·13925-13930
·
IF 2.324
Li Tianjing,Shi Qingle
In this paper, explain a new relationships between Bi 3+ content, the phase crystal, microstructure and conductivity for Sm and Bi co-doped Ce 0.8− x Sm 0.2 Bi x O 1.9−1/2 x ( x = 0, 0.05, 0.1, 0.15, 0.2) electrolytes prepared by co-precipitation method. The XRD patterns showed that this compounds exhibit a fluorite-type cubic structure after the samples calcined at 700 °C for 4 h and the cell volumes of increased when the Bi content increased. In addition, for the samples sintered at 1400 °C for 4 h, the Bi doping improves the relative density, the grain size and the average thermal expansion coefficient (TEC). More in details, the relative density and TEC increase with the Bi content. Form the AC impedance spectroscopy measurements, the conductivity of the sintered samples is found to improve with the increasing of Bi content (for x ≤ 0.15), which is ascribed to the increasing of the number of oxygen ion vacancies and the increase in the unit cell volume. However, the conductivity decreases when the Bi content is further increased (0.15 < x ≤ 0.2), which is ascribed the reduction of the number of free oxygen vacancies. The highest conductivity at 800 °C is 5.6 × 10 −2 S/cm and the activation energy is 0.83 eV for Ce 0.65 Sm 0.2 Bi 0.15 O 1.825 , indicating that this would be a promising electrolyte for the intermediate temperature-solid oxide fuel cell applications.
研究领域:
材料科学
·
无机非金属材料
·
固态离子学
·
能源材料
·
燃料电池
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Wei Jiang,Yajun Li,Hongcheng Li,Yuhao Fu,Yi Li,Jian Ren,Qian Li,Limei Pan,Jian Yang
In this work, a unique three-dimensional (3D) network NiFeCoP@Ti₃C₂Tₓ composite, consisting of Co, Fe co-doped Ni 2 P (NiFeCoP) nanosheets anchored on Ti₃C₂Tₓ nanosheets via heterojunction, was situ constructed by phosphidizing the NiFeCo-LDH@Ti₃C₂Tₓ precursor. The 3D network structure establishes a 3D conductive network while generating a built-in electric field at the heterointerface, which efficiently accelerates electron/ion transport and simultaneously improves the structure stability of the electrode. DFT calculations demonstrate that Co doping further optimizes the electronic structure of NiFeCoP, introduces additional active sites, thereby promoting electrochemical reaction kinetics. Meanwhile, the synergistic effect among Ni, Fe, and Co with different redox potentials effectively buffers the volume changes during charge/discharge processes. Consequently, NiFeCoP@Ti₃C₂Tₓ as lithium ion batteries (LIBs) anode shows outstanding electrochemical performance at different current density (950 mAh/g after 340 cycles at 0.5 A/g, 816 mAh/g after 900 cycles at 1 A/g, 541 mAh/g after 1000 cycles at 2 A/g).
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 15
·1-12
·
IF 2.8
Pan Yusong,Zhu Yuan,Wang Yuanqing,Huang Run,Pan Chengling
Based on the strong capability of transition metal ions for peroxymonosulfate (PMS) activation and highly affinity of MoS 2 towards PMS, thus decorating MoS 2 with transition metal ions would efficiently activate PMS for degradation of organic pollutants. In this work, Co/Fe co-doped MoS 2 catalyst were synthesized by simple chemical method. The prepared Co/Fe co-doped MoS 2 catalyst displayed excellent catalytic activity for organic pollutant degradation. The removal efficiency of RhB and MB is 99% in 6 min and 98% in 15 min under PMS system, respectively. Both the capture experiment and EPR results verified that 1 O 2 played an important role in the organic pollutant degradation process in PMS system. The catalytic mechanism revealed that the synergistic effect between Mo ion and Co/Fe ions is beneficial for boosting the catalytic properties of Co/Fe co-doped MoS 2 catalyst. The cycle experiments confirmed that Co/Fe co-doped MoS 2 possesses excellent chemical stability and re-usability.
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