APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Longfei Ruan,Xueting Jiao,Xinyu Ge,Dapeng Cui,Zhengyi Sun,Xiao-chun Hang,Wei Shen,Zhengtao Deng
Metal ion doped semiconductor nanocrystals have attracted broad interest due to the doping ions could tailor their optical, electronic, transport, structure stability and spintronic properties. Herein, we report a novel ligand-mediated solvent-induced reprecipitation approach to synthesize stable and highly fluorescent thiol-passivated Mn-doped perovskite-related tetragonal CsPb 2 Cl 5 nanosheets (NSs). The rational tuning the chemical composition ( i.e. , Pb/Mn ratio) and controlling the crystal phase of the CsPb 2−x Mn x Cl 5 perovskite NSs have been achieved. Significantly, their crystal structure and photoluminescence properties are found to be well-reserved for over two months under ambient conditions. With the addition of Mn 2+ , the PL lifetime of CsPb 2 Cl 5 decreases, which further confirms the energy transfer of CsPb 2 Cl 5 to Mn 2+ , and energy transfer efficiency (η ET ) from CsPb 2 Cl 5 to Mn 2+ in CsPb 2−x Mn x Cl 5 NSs is as high as 54.9 %. Furthermore, benefited from the Mn 2+ doping, the antiferromagnetic fitting temperature of the NSs is −5 K, which indicates a strong antiferromagnetic coupling. This work suggests an expansive research prospect for application of metal ion doped perovskite-related materials in the field of optical, magnetic, and optoelectronics devices.
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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.
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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.
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高影响因子
Frontiers of Chemical Science and Engineering
·
2024
·Vol. 18
·期 11
·1-10
·
IF 4.3
Liang Haoting,Zhao Qiao,Liu Shengkun,Wei Chongyang,Wang Yidan,Wang Yue,Huang Shouying,Ma Xinbin
The Fe-Mn bimetallic catalyst is a potential candidate for the conversion of CO 2 into value-added chemicals. The interaction between the two metals plays a significant role in determining the catalytic performance, however which remains controversial. In this study, we aim to investigate the impact of tuning the proximity of Fe-Mn bimetallic catalysts with similar nanoparticle size. And its effect on the physicochemical properties of the catalysts and corresponding performance were investigated. It was found that closer Fe-Mn proximity resulted in enhanced CO 2 hydrogenation activity and inhibited CH 4 formation. The physiochemical properties of prepared catalysts were characterized using X-ray diffraction, H 2 temperature programmed reduction, and X-ray photoelectron spectroscopy, revealing that a closer Fe-Mn distance promoted electron transfer from Mn to Fe, thereby facilitating Fe carburization. The adsorption behavior of CO 2 and the identification of reaction intermediates were analyzed using CO 2 -temperature programed desorption and in situ Fourier transform infrared spectroscopy, confirming the intimate Fe-Mn sites contributed to CO 2 adsorption and the formation of HCOO* species, ultimately leading to increased CO 2 conversion and hydrocarbon production. The discovery of a synergistic effect at the intimate Fe-Mn sites in this study provides valuable insights into the relationship between active sites and promoters.
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高影响因子
Nano Research
·
2024
·
IF 9.5
Gao Li,Song Yang,Xu Xuebing,Li Chang,Hu Chaoquan
In this study, a Mn-modified Pt-based catalyst loaded on nitrogen-doped Ketjen black (Mn-Pt/NKB) is prepared using a simple ethylene glycol reduction method. The size of Pt nanoparticles (NPs) is effectively controlled by doping with Mn and N. With the smallest average particle size of 1.7 nm, Mn-Pt/NKB demonstrates half-wave potentials of 0.890 and 0.688 V in the alkaline and neutral electrolytes, respectively, which are superior to those of commercial platinum on activated carbon (Pt/C). When applied as an air cathode in aluminum-air battery, it exhibits ultra-high power densities of 190 (alkaline) and 26.2 mW·cm −2 (neutral). Moreover, the voltage remains stable after 5 h of discharge. The practical application performance of the Mn-Pt/NKB catalyst in an aluminum-air battery is better than that of commercial Pt/C. Furthermore, the oxygen reduction reaction (ORR) mechanism on surfaces with different particle sizes is analyzed using density functional theory. Oxygen cracking is the major pathway on the surface of the small particles with lower energy consumption of 0.5 eV, while water molecule cleavage is the major pathway on the surface of the large particles with higher energy consumption of 0.97 eV. The lower energy consumption of the oxygen cracking pathway further confirms the ORR mechanism for higher activity on small-sized surfaces. This study provides a direction for the rational design of Pt-based catalysts for ORR and sheds light on the commercial development of aluminum-air batteries.
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高影响因子
APPLIED SURFACE SCIENCE
·
2013
·
IF 2.112
Qiu-Hang Chen,Jie Zhang,Guo-Ping Chen,Rui-Qian Guo
Spindle-liked ZnSe and Mn:ZnSe quantum dots (QDs) were formed via an optimized greener approach, which may be attributed to the amine ligands adhering asymmetrically to the crystal facets. Powder X-ray diffraction (XRD) patterns revealed that the ZnSe and Mn:ZnSe QDs have a zinc blende cubic crystal structure. The crystallite size of ZnSe was calculated to be about 4 nm from the (1 1 1) peak width using the Scherrer equation, which was in agreement with the HRTEM findings. The fluorescence emission peak of as-prepared ZnSe and Mn:ZnSe QDs was 431 nm and 580 nm respectively. We investigated the effect of the reaction temperature, reflux time, precursor solvent, size of MnSe core and overcoating temperature of ZnSe layer on the optical properties of ZnSe and Mn:ZnSe QDs. It is shown that the precursor solvent plays a key role in the formation of the magic-sized QDs (MSQDs). And as a result, doped quantum dots (d-dots) showed a large Stokes shift and enhanced photoluminescence, and smaller size of the MnSe core and suitable overcoating temperature of ZnSe shell were identified as two key parameters for obtaining the high quality d-dots.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Yihe Qin,Run Yuan,Shaojun Luo,Haiming Huang,Xuwen He
Catalysts with high catalytic performance are crucial for the catalytic ozonation of organic wastewater. This study synthesized an efficient, stable, and practical Fe-Mn/Al 2 O 3 ozone catalyst for wastewater treatment using an impregnation calcination method, and applied it in the catalytic ozonation of wastewater. When the concentration of manganese nitrate was 0.15 mol/L, the Mn/Fe ratio was 3:1, the immersion time was 24 hours, the calcination temperature was 500 ℃, and the calcination time was 4 hours, the prepared Fe-Mn/Al 2 O 3 had the best catalytic effect on simulated wastewater, with a chemical oxygen demand (COD) removal efficiency of 73.6%. At the same time, the physicochemical properties of the catalyst were investigated, and the catalytic effect of the catalyst on actual coking wastewater was investigated on a laboratory scale. When the ozone concentration was 20 mg/L, the gas flow rate was 0.5 L/min, the catalyst concentration was 400 g/L, and the pH was 7.02, the actual COD removal efficiency of coking wastewater was 71.6%. The pilot test results showed that the COD of the treated coking wastewater could stably meet the standard (COD<80 mg/L), with an average COD removal rate of about 58.3%, indicating that the Fe-Mn/Al 2 O 3 had high catalytic activity and good stability. Kinetic analysis showed that the degradation process of organic pollutants followed the pseudo-second-order kinetic equation. The results of water quality analysis such as conventional water quality indicators, fluorescence spectroscopy, and molecular weight classification indicated that the large molecular organic pollutants were efficiently degraded. Mechanism analysis indicated that the active components of the catalyst reacted with ozone through electron transfer to enhance the ozone utilization efficiency and efficiently remove organic pollutants. This study can provide theoretical support and technical reference for the standardized discharge of coking wastewater in the future.
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高影响因子
APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Fangchao Wang,Rui Liu,Hongyi Cui,Ali Ramazani,Ali Morsali,Guoying Zhang
The epoxidation of long-chain α-olefins presents a significant challenge in synthetic chemistry, particularly when employing molecular oxygen from air as the sole oxidant under additive-free conditions. In this study, we demonstrate that manganese supported on mesoporous silica (Mn/MSN) effectively catalyzes the aerobic epoxidation of long-chain α-olefins without requiring initiators or sacrificial agents. Mechanistic investigations reveal a synergistic interplay between Mn(II) and Mn(III) species, which facilitates the selective cleavage the peroxo bonds (O–O) in alkyl hydroperoxide intermediates. Strategic incorporation of iron and zirconium into the Mn/MSN framework modulates the manganese oxidation states, enriching the Mn(II)/Mn(III) ratio and achieving a remarkable space-time yield of up to 200 mol epoxide mol⁻¹ Mn h⁻¹ . Radical trapping experiments combined with high-resolution mass spectrometry corroborate the formation of allyl carbon-centered and alkoxy radical intermediates during the reaction. This work provides a feasible strategy for long-chain α-olefin aerobic epoxidation without any additives.
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高影响因子
MOLECULES
·
2025
·Vol. 30
·期 7
·1639
·
IF 4.6
Hongrui Guo,Fan Yang,Siwei Chen,Hejuan Wu,Jirui Yang,Feng Shen
The production of formic acid (FA) from lignocellulose and its derived sugars represents a pivotal upgrading reaction in biorefinery. This work prepared a Mn-Mo doped carbon nanotube composite catalyst for the catalytic oxidation of glucose into FA in an O2atmosphere, under extremely low Mn (3.27%) and Mo (0.40%) loading conditions, displaying a comparable performance with the traditional vanadium-based catalyst suffering from toxicity issues. It was confirmed that the doping of Mo led to the formation of MnMoOXand increased the contents of low-valence Mn species (Mn2++ Mn3+), lattice oxygen (Olatt), and surface adsorbed oxygen (Oads) based on various characterization methods, such as XRD, XPS, TEM and ICP, which were beneficial to improve the catalytic performance. The maximum FA yield of 58.8% could be achieved over Mn9Mo1OX@MWCNT after reaction for 6 h at 140 °C, which was far more than that obtained with undoped MnOX@MWCNT (14.5%) at the identical conditions. Glyoxylic acid and arabinose were identified as two main intermediates, suggesting that the transformation of glucose into FA over Mn9Mo1OX@MWCNT involved two different paths. This work proved that manganese-based catalyst was a green alternative for upgrading lignocellulose via catalytic oxidation.
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DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Qingyun Liu,Yi Wang,Tianzhao Hu,Shaorui Chen,Yaozu Wang,Hui Zhao,Wu Zhang,Zhigang Yuan,Yulian Wang,Zhenhua Sun,Feng Li
Achieving high energy density in aqueous asymmetric electrochemical capacitors hinges on the development of electrode materials that combine exceptional capacitance with superior conductivity. Despite its high theoretical capacitance, Ni(OH)2 is limited by low intrinsic conductivity, significantly limiting its performance. In this study, a Mn–Ni(OH)2@1T-MoS2 heterostructure was synthesized through a facile growth method, achieving significant electrochemical performance boost. The lattice matching at the heterointerface induces a controlled lattice expansion in Mn–Ni(OH)2, while the interfacial interactions promote electron transfer from Mn–Ni(OH)2 to 1T-MoS2. These synergistic effects enhance conductivity and active site utilization, addressing the core challenges of pristine Ni(OH)2. As a result, the heterostructure exhibits a high specific capacity of 244.2 mA h g−1 at 1 A g−1 and a rate capability of 51.4% at 12 A g−1. Moreover, the assembled asymmetric electrochemical capacitor delivers an energy density of 61.67 W h kg−1 at 600 W kg−1 and maintains 72.7% capacity retention after 10 000 cycles at 5 A g−1. This work not only highlights the critical role of heterointerfaces in enhanced electrochemical performance but also provides a robust strategy for designing high-performance energy storage systems.
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高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Hao Sun,Hui Yuan,Jiangshan Hu,Jiayu Chen,Jie Han,Peiyuan Wang,Can-zhong Lu,Ting Hu,Yuhang Li
Psoriasis is a prevalent chronic inflammatory disorder affecting approximately 0.72% of the Chinese population. Currently, available treatments cannot completely cure this disease. The excessive production of reactive oxygen species (ROS) has been considered to be a key contributor to the progression of psoriasis. In this study, Ce and Mn were doped into mesoporous silicon nanomaterials with optimized ratios that could form uniform and well-dispersed CM@MSNs particles, which were able to effectively remove a wide range of ROS. As a result, treatment with CM@MSNs could reduce epidermal hyperplasia and prevent inflammatory reactions in the imiquimod (IMQ)-induced psoriasis-like model in mice. Mechanistically, CM@MSNs might prevent the inflammation by repressing the IL-17 and NF-κB signaling pathways and ameliorating epidermal hyperplasia through the activation of both canonical and noncanonical Wnt signaling pathways. In conclusion, this research could lead to a promising treatment method for psoriasis. This work provides an example of nanoenzymes for effectively scavenging ROS of diseases.
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高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Yifang Wu,Jianwang Wu,Mei Lin,Zuliang Chen
The Fenton oxidation system is a widely employed advanced oxidation processes (AOPs) in wastewater treatment. However, the traditional Fenton oxidation system suffers from low oxidant utilization efficiency, leading to significant resource wastage. This study presents a novel self-Fenton Cu-Mn bimetallic catalyst (with a Cu:Mn ratio of 10:1), which is capable of simultaneously activating O 2 to generate H 2 O 2 in situ and further catalyzing the decomposition of H 2 O 2 to produce reactive oxygen species (ROS). Notably, this self-Fenton system demonstrate high removal efficiency for ciprofloxacin (CIP) across a broad pH range (2−9), achieving up to 92.55 % removal in water. Quenching experiments, electron paramagnetic resonance (EPR) analysis, steady-state concentration measurements, and Galvanic oxidation reactor (GOR) experiments collectively confirmed the generation of multiple ROS species (·OH, ·O 2 − , and 1 O 2 ) and indicated that electron transfer plays a significant role in pollutant degradation. X-ray photoelectron spectroscopy (XPS) analysis revealed that Cu 0 exhibited high catalytic activity, enabling simultaneous generation and activation of H 2 O 2 . Liquid chromatography-mass spectrometry (LC-MS) and toxicity assessments demonstrated a significant reduction in the toxicity of CIP degradation products. This work elucidates a novel Cu-Mn synergistic mechanism wherein Mn facilitates the generation of H 2 O 2 , while Cu effectively activates it into ROS. This synergism effect enables the removal of pollutants through both radical and non-radical pathways, thereby offering an innovative strategy for environmental remediation and AOPs.
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DOI
PubMed
高影响因子
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