SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Wenjing Zong,Zhaoming Guo,Minghuo Wu,Xianliang Yi,Hao Zhou,Siyuan Jing,Jingjing Zhan,Lifen Liu,Yang Liu
Endocrine-disrupting chemicals (EDCs) cause serious threats to human health. Five types of MnO 2 were synthesized and characterized. They exhibited different removal performances for three EDCs, i.e., estrone (E1), ethynylestradiol (EE2) and bisphenol A (BPA). Only δ-MnO 2 can completely remove E1 within 120 min at pH 3.0. Free Mn (III) was determined at the beginning of the reaction and participated in the EDCs removal process. Electron spin resonance (ESR) indicated that δ-MnO 2 could produce superoxide anions (·O 2 − ) and singlet oxygen ( 1 O 2 ) in the existence of methanol. The reactive oxygen species (ROS) quenching experiments showed 1 O 2 have certain contribution to the E1 removal by δ-MnO 2 . The source of ROS is mainly the lattice oxygen from δ-MnO 2 , and can be replenished through the layer structure destruction caused by the reaction between Mn(III) and E1. The ROS dependent EDCs removal by δ-MnO 2 leads to a deep understanding on this well-known oxidant.
研究领域:
环境科学
·
化学工程
·
水处理
✓ 已验证
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Yong Zhang,Yutao Zhang,Caihong Wu,Yiting Yang,Qiang Li,Yongnan Chen
To improve the high-temperature oxidation resistance and electrical conductivity of ferritic stainless steels , protective Ce-doped NiMn 2 O 4 spinel coatings were fabricated on the surface of SUS430 steel by electrophoretic deposition (EPD). The phase structure and microstructure of Ce-doped NiMn 2 O 4 in both powder and coating forms were characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The high-temperature oxidation of the NiMn 2 O 4 spinel coating before and after Ce doping in the air at 800 °C for 168 h was studied by weight gain experiments. The area-specific resistance (ASR) of coatings was measured by a standard four-probe method. It was found that the Ce-doped NiMn 2 O 4 spinel powder displayed a stable structure, high crystallinity, fine grain size, and decreased agglomeration when the Ce content was fixed at 0.05 mol∙L −1 . The oxidation kinetics of NiMn 2 O 4 -coated SUS430 steel before and after Ce doping obeyed a parabolic law with parabolic rate constants of 4.58 × 10 −15 g 2 cm −4 s −1 and 1.83 × 10 −15 g 2 cm −4 s −1 , respectively. When oxidized at 800 °C for 50 h, the ASR value of the coated samples before and after Ce doping stabilized at about 15.2 mΩ∙cm 2 and 14.5 mΩ∙cm 2 , respectively. This work demonstrated that the Ce-doped NiMn 2 O 4 spinel coating improved the high-temperature oxidation resistance and the electrical conductivity of metal interconnects.
研究领域:
材料科学
·
表面工程
·
高温材料
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Shuai Zhang,Shihao Li,Haiyan Zhang,Juanlang Guo,Xianggang Gao,Hongbing Shi,Fangyan Liu,Zeyu Huang,Simin Li,Zhian Zhang
Li-rich Mn-based layered oxides (LLOs) have emerged as one of the most promising cathode materials for the next-generation lithium-ion batteries (LIBs) because of their high energy density , high specific capacity, and environmental friendliness . These materials, however, have drawbacks such as capacity degradation, low initial coulombic efficiency (ICE), voltage decay, and poor rate performance due to irreversible oxygen release and structural deterioration during cycling. Herein, we present a facile method of triphenyl phosphate (TPP) surface treatment to create an integrated surface structure on LLOs that includes oxygen vacancies , Li 3 PO 4 , and carbon. When used for LIBs, the treated LLOs show an increased initial coulombic efficiency (ICE) of 83.6% and capacity retention of 84.2% at 1C after 200 cycles. It is suggested that the enhanced performance of the treated LLOs can be attributed to the synergetic functions of each component in the integrated surface, such as the oxygen vacancy and Li 3 PO 4 being able to inhibit the evolution of oxygen and accelerate the transport of lithium ions , while the carbon layer can restrain undesirable interfacial side reactions and reduce the dissolution of transition metals. Furthermore, electrochemical impedance spectroscopy (EIS) and galvanostatic intermittent titration technique (GITT) prove an enhanced kinetic property of the treated LLOs cathode, and ex-situ X-ray diffractometer shows a suppressed structural transformation of TPP-treated LLOs during the battery reaction. This study provides an effective strategy for constructing an integrated surface structure on LLOs to achieve high-energy cathode materials in LIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Weisan Fang,Ying Tang,Junqi Chen,Jie Li,Liang Fang
Two garnet-structured ceramics, Ca 3 B 2 GeV 2 O 12 (B = Mg, Mn), were synthesized using a traditional solid-state reaction method, and their sintering behavior, structures, vibrational spectra, and magnetic and microwave dielectric properties were characterized. Low permittivity ( ε r ) of 9.75 (Ca 3 Mg 2 GeV 2 O 12 ) and 11.06 (Ca 3 Mn 2 GeV 2 O 12 ), quality factor ( Q × f ) of 54,000 GHz (Ca 3 Mg 2 GeV 2 O 12 ) and 30,240 GHz (Ca 3 Mn 2 GeV 2 O 12 ), and temperature coefficient of resonant frequency ( τ f ) of −61.2 ppm/ ° C (Ca 3 Mg 2 GeV 2 O 12 ) and −66.4 ppm/ ° C (Ca 3 Mn 2 GeV 2 O 12 ) were obtained. The ε r value was correlated with the sum of the ionic polarization per unit volume. The Q × f value was associated with the part with a fully filled 3 d orbit, un-paired d electrons of B-site ion, and magnetic loss. The τ f was correlated to the bond valance at the A- and C-sites. Moreover, the fitting analysis of the far-infrared reflectance spectra of Ca 3 Mg 2 GeV 2 O 12 revealed that the active vibration modes in the low wave number range (100 - 400 cm -1 ) contributed mainly to the intrinsic microwave dielectric polarization.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2024
·Vol. 21
·期 5
·3645-3651
·
IF 1.8
Jinghui Peng,Hengchang Nie,Yuou Yuan,Xiao Yong,Biao He,Genshui Wang,Fanglin Du,Liang Shi,Xiaofei Qu,Shuai Zhang
Mn-doped (1- x )Bi 0.5 (Na 0.8 K 0.2 ) 0.5 TiO 3 - x BiAlO 3 (Mn:BNKT- x BA) thin films were synthesized on lanthanum nickelate-coated silicon substrates by sol-gel method. The second phase issue of the film can be effectively addressed by optimizing the substrate, and the maximum polarization and breakdown strength can be increased by introducing the proper amount of Al 3+ , which is advantageous for the film for energy storage. The results have shown that the Mn:BNKT-0.03BA film exhibits superior ferroelectric properties (with remanent polarization (P r ) of 23.72 µC/cm 2 , maximum polarization (P max ) of 75.37 µC/cm 2 ), which could be an excellent candidate for ferroelectric thin film capacitors.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Shurui Xu,Jiaer Li,Bingyu Zhu,Xin Tang,Yujian Li,Linjia Wang,Wenbo Liao,Xiaobo Fu,Hang Chen,Junling Tu,Kailai Zhang,Baizeng Fang,Guoyu Zhong
Investigating renewable, eco-friendly, carbon-based materials with superior electrochemical performance is pivotal for advancing the practical implementation of supercapacitors, yet it presents challenges. In this study, a novel MnO@C-HMT-T composite, consisting of porous carbon-encapsulated MnO, was synthesized from a Mn-hexamine coordinated precursor via an in-situ pyrolysis approach. Among the different materials prepared, the MnO@C-HMT-800 stood out. It displayed a mesoporous architecture with a high specific surface area of 1353.1 m 2 g −1 , which facilitates ion transport and energy storage. Additionally, the MnO encapsulated in the carbon layer enables the generation of pesudocapacitance via the redox reaction of Mn 2+ and Mn 3+ . The interaction between the double-layer capacitance of the porous carbon and the pseudocapacitance of the manganese oxides endows the MnO@C-HMT-T composite with superior electrochemical performance. Consequently, the MnO@C-HMT-800 electrode exhibits an impressive specific capacitance of 575.2 F/g at a current density of 1 A/g, demonstrating exceptional stability at 95.6 % after 10,000 cycles. This surpasses the performance of most reported Mn-based materials in the literature. This work presents an innovative and straightforward process for fabricating carbon-encapsulated transition oxides that could be highly valuable in energy storage systems.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
功能材料
·
电化学能量储存
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2025
·
IF 4.9
Dan Chen,Kan Li,Hanyue Bao,Ming Zhai,Zhong Wang,Xiaozhi Wang
In this paper, a series of Ce@Mn core-shell catalysts were synthesized via a two-step hydrothermal method. Hydrothermal temperature significantly influenced the structure formation of catalysts. The Ce@Mn-150 catalyst, synthesized at 150 °C exhibited a well-defined core-shell structure. Moreover, it converted approximately 35 % of HCHO into CO 2 and H 2 O at ambient temperature, and achieved 90 % conversion of HCHO at 90 °C. Through structural characterization of the catalysts, distinct morphological differences were observed across all samples. The Ce@Mn-150 catalyst, which demonstrated the optimal catalytic activity, exhibited the most complete core-shell structure. The formation of the core-shell structure promoted the generation of Ce-Mn interfacial effects, which in turn modulated the interactions between Ce and Mn species . Elemental valence state characterization revealed that the well-defined core-shell structure facilitated the generation of Mn 3+ and Ce 3+ species, along with enhanced concentrations of surface-adsorbed oxygen (O ads ) and oxygen vacancies (O v ), which collectively enhanced HCHO adsorption and activation. H 2 -TPR results indicated that the core-shell structure enhanced the low-temperature reducibility of the catalyst and preserved abundant oxygen vacancies. This study revealed the influence of core-shell structures and intermetallic interactions at the core-shell interface on the catalytic performance of the catalyst, providing insights for designing efficient non-noble metal catalysts for HCHO removal.
研究领域:
环境催化
·
材料化学
·
大气污染控制
·
表面科学
·
纳米材料
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Jianwei Gao,Xiaoqing Si,Mingshen Li,Pengpeng Xue,Bo Yang,Chun Li,Junlei Qi,Jian Cao
Microwave-sintered Ni-doped Mn–Co spinel coatings were developed as advanced protective layers for solid oxide fuel cell (SOFC) interconnects. By systematically varying the Ni content (in MnCo 2-x Ni x O 4 , x = 0–0.5), we demonstrate that Ni incorporation significantly alters cation valence distributions and oxygen vacancy concentrations, leading to a substantial reduction in the thickness of Cr-containing oxide layers compared to undoped coatings. Among the compositions studied, the MnCo 1.7 Ni 0.3 O 4 coating exhibited the best performance, maintaining an area-specific resistance (ASR) below 20 mΩ cm 2 after 500 h at 800 °C, indicating excellent electrical conductivity and long-term stability. Crystal field analysis revealed that Ni doping not only suppresses the Jahn-Teller distortion of Mn 3+ but also enhances configurational entropy, thereby stabilizing the spinel structure against Cr diffusion. These findings establish entropy engineering via Ni substitution as a viable strategy for designing thermodynamically robust, electrically conductive, and Cr-resistant coatings, offering a promising pathway for durable SOFC interconnect applications.
研究领域:
材料科学
·
能源材料
·
电化学
·
功能陶瓷
·
高温腐蚀防护
·
固态离子学
·
燃料电池技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 25
·45661-45668
·
IF 5.6
Yuyu Liu,Fan Zhang,Rui Zhu,Weijin Chen,Yue Zheng
It is well known that doping can significantly affect the dielectric and eletromechanical properties of perovskite ferroelectrics like BaTiO 3 . However, the influence of transition group element doping on the flexoelectric property of BaTiO 3 -based ceramics remains poorly studied. Here, we made a comparative investigation on the flexoelectric property of BaTiO 3 -based ceramics doped by transition group elements V, Mn and Ni. The phase composition, crystal structure, and average grain size of the ceramics were determined using X-ray diffraction refinement and scanning electron microscopy. It shows that the samples all exhibit dense and uniform microstructures with clear grain boundaries, but they have different average grain sizes ranging from 15 to 59 μm. Ceramics with larger average grain sizes exhibit higher dielectric constants and Curie temperatures. While the flexoelectric coefficient of Ni-doped, V-doped and pure BaTiO 3 ceramics varies from 15.36 μC/m to 60.37 μC/m, showing positive correlation with average grain sizes, that of the Mn doped BaTiO 3 ceramic which has the largest average grain size (59 μm) is rather small (19.01 μC/m). We suggest that the increased conductivity of ceramics suppresses the flexoelectric effect. The factors determining the flexoelectric coefficient of BaTiO 3 based ceramics doped by transition group elements should include electrical conductivity in addition to dielectric constant which is further affected by grain size. Our work gains new insight into the flexoelectric effect in perovskite oxide ceramics.
研究领域:
材料科学
·
功能陶瓷
·
铁电材料
·
凝聚态物理
·
电子显微学
·
介电学
·
固态化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
·
2024
·Vol. 41
·期 3
·809-819
·
IF 1.8
Longwen Yang,Longwen Yang,Aochen Du,Aochen Du,Xingke Zheng,Xingke Zheng,Yun Ye,Yun Ye,Enguo Chen,Enguo Chen,Sheng Xu,Sheng Xu,Tailiang Guo,Tailiang Guo
All-inorganic perovskite quantum dots (PQDs) have excellent photoelectric performance, such as high photoluminescence quantum yield (PLQY), narrow full width at half-maximum (FWHM), and emission spectra covering the visible light wavelength. The emission color can be tuned over the full visible spectral region making them promising for white-light-emitting diodes (WLEDs). Further control over the optical and magnetic properties of PQDs can be achieved through doping of transition metal ions such as ${{\rm Mn}^{2 +}}$ ions. In this paper, a rapid doping method is employed at room temperature by using strong-acid cation-exchange resin during the metal ions doping process, which shortens the doping time, and ${\rm Mn}{:}{\rm CsPb}{({\rm Cl}/{\rm Br})_3}$ QDs were obtained. By controlling the reaction time between strong-acid cation-exchange resin and PQDs, we achieve different levels of manganese doping, resulting in a new, to the best of our knowledge, fluorescence peak at 600 nm. The introduction of strong-acid cation-exchange resin preserves the integrity of the PQD structure, while completing the doping within 30 min. Due to the low cost and mild reaction conditions of resin, it is expected that the ${\rm Mn}{:}{\rm CsPb}{({\rm Cl}/{\rm Br})_3}$ QDs can be mass-produced in large quantities. In addition, in order to provide high-quality white light emission, and prevent anion exchange reactions when mixed with ${{\rm CsPbBr}_3}$ QDs, the ${{\rm CsPbBr}_3}$ QDs are coated with silicon. Finally, by combining ultraviolet-light-emitting diodes (UVLEDs) with the aforementioned PQD mixture, this paper successfully fabricates WLEDs and demonstrates its excellent photoelectric performance. The constructed WLEDs produce warm white light with a high color rendering index (CRI) of 91 and a high correlated color temperature (CCT) of 5966 K, and the luminous efficacy (LE) of WLEDs is ${41}\;{{\rm lmW}^{- 1}}$.
研究领域:
材料科学
·
光电技术
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2015
·Vol. 5
·期 5
·2959-2972
·
IF 5.426
Ran Zhang,Li Guo,Chen Chen,Jizhong Chen,Angjun Chen,Xiuge Zhao,Xuerui Liu,Yuhe Xiu,Zhenshan Hou
A novel highly active Mn-doping ceria heterogeneous catalyst (MnOx–CeO2) was prepared and dedicated to the catalytic synthesis of aliphatic carbamates from CO2, aliphatic amines and methanol in one step. The as-obtained catalyst can attain a high yield of carbamate up to 82%, and can also be recycled at least four times through a simple procedure. It was observed that the Mn doping to ceria can alleviate the catalyst deactivation in consecutive catalytic recycles. In this regard, the role of Mn doping in the ceria in the synthesis of the aliphatic carbamates was investigated by means of X-ray diffraction (XRD), Raman spectra, specific surface areas (BET), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), CO2-temperature programmed desorption (CO2-TPD) and in situ diffuse reflectance infrared Fourier transform (DRIFT). The characterization demonstrated that the presence of MnOx in the ceria can not only inhibit the formation of stable carbonate species on the surface of the catalyst but also promote the decomposition/consuming of the carbonaceous species during the synthesis of aliphatic carbamates so as to allow improvement of the recyclability of the catalyst.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
WATER RESEARCH
·
2017
·
IF 6.942
Erdan Hu,Ya Zhang,Shuyan Wu,Jun Wu,Liyuan Liang,Feng He
Mn(III) is a strong oxidant for one electron transfer , which may be important in the transformation of organic contaminants during water/wastewater treatment and biogeochemical redox processes. This study explored the reaction mechanisms of dissolved Mn(III) with organics. The role of dissolved Mn(III) either as a catalyst or an oxidant in reactions with organics was recognized. Aquo and/or hydroxo (or free) Mn(III), generated from the bisulfite activated permanganate process, facilitated efficient N-dealkylation of atrazine via a β-elimination mechanism, resulting no net redox reaction. In contrast, free Mn(III) degraded 4-chlorophenol via intramolecular redox processes, the same as hydroxyl radical ( OH), resulting in dechlorination , OH substitution, ring-opening and mineralization. Mn(III)-pyrophosphate compounds did not react with atrazine because complexation by pyrophosphate rendered Mn(III) unable to bond with atrazine, thus the electron and proton transfers between the reactants couldn't occur. However, it degraded 4-chlorophenol at a slower rate compared to free Mn(III), due to its reduced oxidation potential. These results showed two distinct mechanisms on the degradation of organic contaminants and the insights may be applied in natural manganese-rich environments and water treatment processes with manganese compounds .
研究领域:
环境科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）