Journal of Energy Storage
·
2025
·
IF 9.8
Yanmin Qin,Shihao Zhao,Haoda Wu,Chenxu Sun,Jing Xu,Ming Yang,Ruidan Shi,Haifeng Bao
Transition metal sulfides such as FeS are promising anode materials for lithium-ion batteries (LIBs) due to their high theoretical capacity and natural abundance. However, their practical application is hindered by poor electronic conductivity, severe volume expansion, and irreversible structural degradation. To overcome these limitations, we report a dual-regulation strategy that integrates Mn doping and nitrogen-doped carbon (NC) coating to synergistically enhance both the lattice structure and interface characteristics of FeS. The resulting Mn-FeS/NC composite exhibits anisotropic lattice expansion, with the (102) crystal plane spacing increasing from 0.209 nm to 0.263 nm. Density functional theory (DFT) calculations reveal that Mn doping significantly lowers the Li + insertion/extraction energy barrier. Meanwhile, the NC coating forms a highly conductive and flexible network that buffers volume changes and enhances interfacial stability. Benefiting from this multiscale synergy, Mn-FeS/NC delivers a high initial discharge capacity of 1660.4 mAh g −1 at 0.1 A g −1 with an initial Coulombic efficiency of 75.8 %, and maintains 728.9 mAh g −1 after 600 cycles at 1.0 A g −1 . Even at 5.0 A g −1 , a capacity of 413.6 mAh g −1 is retained. Kinetic analysis confirms a dominant pseudocapacitive behaviour, contributing up to 72.3 % at high scan rates. This study not only provides quantitative insight into the synergistic effect of Mn doping and NC encapsulation, but also offers a viable design strategy for high-performance metal sulfide anodes in next-generation LIBs.
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Advanced Energy Materials
·
2025
·Vol. 15
·期 34
·2502226
·
IF 26
Mengting Guo,Changping Wang,Yize Niu,Mingyue Ruan,Dong Yang,Fei Wang,Haonan Wang,Nankai Wang,Ying Jiang,Tianyi Li,Yan He,Qiang Li
The high-voltage spinel LiNi 0.5 Mn 1.5 O 4 (LNMO) is a promising cathode material for lithium-ion batteries due to its high energy and power densities, excellent thermal stability, low cost, and environmental benignity. However, the presence of Mn 3+ induces Jahn─Teller (J─T) distortion, leading to Mn─O bond elongation, lattice stress, and degradation of both structural and electrochemical stability during cycling. To address this,a bond-length engineering strategy is proposed by co-doping Fe at the Mn 16d sites and Sb at the vacant 16c positions to suppress the J─T effect and stabilize the crystal structure. Electron paramagnetic resonance (EPR), in situ X-ray diffraction (XRD), and density functional theory (DFT) calculations confirm that the Mn─O bond regulation strategy effectively mitigates MnO 6 octahedral distortion, reduces phase transitions, and enhances structural robustness. Moreover, Sb incorporation expands the lattice, facilitating Li + diffusion. As a result, the optimized FeSb-LNMO delivers remarkable electrochemical performance, retaining 98% of its initial capacity after 200 cycles at 1C, and achieving 85.6% capacity retention over 1000 cycles at 5C. This work introduces a novel bond-length engineering approach via multi-site doping to overcome degradation in high-voltage LNMO, enabling ultra-fast charging and long-term cycling stability.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Mingwei Zhang,Cheng-Bin Hong,Zhaoying Ding,Yujing Weng,Honghui Gong,Haiyong Wang,Yulong Zhang,Yuhe Liao,Haichao Liu
Hydrogenolysis of glycerol is an important reaction in biomass valorization, and requires efficient catalysts for selectively removing its hydroxyl groups to yield valuable chemicals, such as 1-propanol and 1,2-propanediol. In this work, we synthesized a porous and non-stoichiometric tungsten oxide (WO x ) by a solvothermal method, and a serious of WO x -supported Pt and Mn ((Mn)Pt/WO x ) catalysts by reduction with H 2 at different temperatures. On these catalysts, the product selectivity in the glycerol hydrogenolysis was significantly influenced by the presence of the Mn species and reduction temperatures. The catalysts after reduction with H 2 at lower temperatures favored the formation of 1-propanol, affording a yield of 88.0 % at 240 °C, while those reduced at higher temperatures facilitated the formation of 1,2-propanediol in a yield of 93.0 % under the same reaction conditions. Extensive analysis of these catalysts by in-situ and ex-situ characterizations showed that the high-temperature reduction led to the formation of MnWO 4 on the Mn/Pt/WO x catalysts and the consequent decrease in the acidic sites and increase in the basic sites, facilitating the alkali-assisted dehydrogenation of glycerol and selective formation of 1,2-propanediol. This study provides fundamental insights into the role of the W and Mn species in tuning the selectivity of the glycerol hydrogenolysis, which will be valuable for designing catalysts towards the valorization of other biomass-based feedstocks.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Ruina Xuan,Jiwen Chen,Yixin Dou,Zhuo Jiang,Xiaofang Li,Deng Ding,Chunlei Wang,Juntao Yan,Linbing Sun
Dual-co-catalyst-modified photocatalysts enhance charge separation efficiency, but the traditional dual co-catalyst is still difficult to get a high separation efficiency due to size and aggregation. Herein, we report bimetallic MIL-53(Fe/Mn) as dual co-catalysts with separate electron and hole mediators. CdS NPs were in-situ grown into MIL-53(Fe/Mn) at varying ratios. 20 %CdS/MIL-53(Fe/Mn) composites shown optimum photocatalytic CO 2 reduction activity. The XPS results shown the strong interaction between CdS and MIL-53(Fe/Mn). The EPR measure proved the carriers of CdS can be transferred to MIL-53(Fe/Mn) oxidation cluster by the oxo-Fe(III)/Fe(II) and oxo-Mn(II)/Mn(III) redox cycling, and the results also suggest the oxo-Fe(III) and oxo-Mn(II) were redox active sites. We believe the approach that bimetallic MOFs act as dual cocatalyst to improve the photocatalytic activity would open a new avenue for the separation efficiency of photo-generated charge carriers.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 3.7
Shaopeng Li,Weichao Li,Yun Wu,Xianming Zheng,Xuehui Zhao,Ning Nan,Hongwei Zhang
The performance of supported catalysts is significantly affected by the dispersion degree of the active components on the support. In this study, citric acid (CA) was used as a modifier to prepare Al 2 O 3 supported Mn-Ce oxides (Mn-Ce/CA-Al 2 O 3 ) by the impregnation-calcination method. The characterization results showed that adding citric acid enhanced the dispersion of Mn-Ce oxides on the support, rendering Mn-Ce/CA-Al 2 O 3 with a larger specific surface area and abundant surface hydroxyl groups, thereby providing more reaction sites for catalytic ozonation. The Mn-Ce/CA-Al 2 O 3 exhibited excellent catalytic ozonation performance in degrading Reactive Black 5 (RB5) dye. It achieved nearly complete decolorization of RB5 within 60 min, with a COD removal efficiency of 60%, which was superior to the sole ozonation (30%). Furthermore, the Mn-Ce/CA-Al 2 O 3 system demonstrated significant degradation of RB5 over a wide pH range of 3–11. Based on the XPS and EPR analysis results, a preliminary mechanism of catalytic ozonation over the Mn-Ce/CA-Al 2 O 3 was proposed. The redox cycle of Mn 3+ /Mn 4+ and Ce 3+ /Ce 4+ effectively accelerated the electron transfer process, thus promoting the generation of reactive oxygen species (ROS) and improving the degradation of RB5. Meanwhile, the Mn-Ce/CA-Al 2 O 3 exhibited superior catalytic stability and effective treatment capabilities for real dye wastewater.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 10
·106512
·
IF 4.386
Zhuoran Hou,Dan Xiang,Di Yang,LiangYing Wen,Han Luo,Lili Li,Qi Yang,Liwen Hu
Designing an efficient and low-cost bifunctional electrocatalyst for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline electrolyte is still very important and challenging. Herein, using a simple hydrothermal and sulfidation annealing method, nanoflower-like Mn-NiS with regular morphology was grown in situ on the surface of nickel foam. Through the detailed analysis of X-ray photoelectron spectroscopy results, it is found that the successful doping of Mn2+ can effectively adjust the electronic structure of NiS. As we envisioned, the prepared Mn-NiS shows only 99 mV overpotential and 64.8 mV dec−1 Tafel slope in HER at 10 mA cm−2 and has only 320 mV and 65.5 mV dec−1 in OER at 50 mA cm−2. In addition, the alkaline electrolytic cell composed of Mn-NiS double electrodes has a cell-voltage of only 1.54 V at 10 mA cm−2, and maintains good stability. More importantly, the results of density functional theory calculations show that after Mn2+ successfully changes the electronic structure on the NiS surface, it not only promotes the HER kinetics, but also greatly increases the OER activity.
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Liying Jiang,Pengju Wang,Yufen Zhang,Zhiwei Yao
Plasma-assisted catalytic oxidation of chlorinated volatile organic compounds (CVOCs) over Co-Mn/TiO 2 catalyst was performed in a dielectric barrier discharge (DBD) reactor having two segmented electrodes. The combination of DBD reactor with segmented electrodes and Co-Mn/TiO 2 catalyst remarkably enhanced the removal efficiency of chlorobenzene (CB) and selectivity of CO 2 . The segmented discharge reactor with Co-Mn/TiO 2 catalyst presented the best performance with 96.3 % of removal efficiency and 69.0 % of CO 2 selectivity at discharge voltage of 17 kV compared with the traditional plasma-only and other plasma-catalytic reactors. Results from discharge characteristics analysis showed that the addition of segmented electrodes and the catalysts could improve the plasma characteristics and greatly boost the specific energy density (SED) at the same voltage, resulting in the generation of more high-energy electrons and chemical active species which favor the oxidation of CB. Although the segmented electrodes facilitated the generation of O 3 , the Co-Mn/TiO 2 catalyst boosted the decomposition of O 3 to generate active oxygen species (O* and O 2 ). The synergistic effect of introducing segmented electrodes and the Co-Mn/TiO 2 catalyst into the DBD reactor at alternate voltages of 13 and 15 kV could promote the deep oxidation of intermediate products thereby bringing less effects on the catalyst surface, leading to a stable and high performance in CB removal. Furthermore, a plausible decomposition mechanism of CB destruction in the DBD reactor having segmented electrode over Co-Mn/TiO 2 catalyst was proposed according to the identification of gaseous intermediates based on GC-MS analysis.
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Catalysts
·
2026
·Vol. 16
·期 10
·857
·
IF 4.5
Piaoyin Zhang,Peiyuan Li,Yingchun Sun,Xin Sun,Ye Jiang,Zhengda Yang,Yang Yang
The control of CO emissions from iron and steel sintering flue gas has received increasing attention. In this work, Pt-loaded Mn–Cu catalysts were prepared by a redox precipitation method to investigate the effects of Pt loading and calcination temperature on low-temperature CO oxidation activity and SO2-induced deactivation behavior. Among the tested catalysts, 1Pt/MnCu-300, containing 1 wt.% Pt and calcined at 300 °C, exhibited the highest low-temperature CO oxidation activity and achieved complete CO conversion at 75 °C. Under the specified SO2-containing test conditions, all catalysts eventually underwent severe and largely irreversible deactivation, whereas Pt loading and calcination temperature altered the transient CO-conversion decay profiles. Pt/MnCu-450 retained high CO conversion for a longer initial period during SO2exposure than the other catalysts in the calcination-temperature series; however, this observation does not by itself demonstrate superior intrinsic SO2tolerance because the present experiments did not quantify SO2breakthrough, sulfur uptake, or active-site-normalized deactivation rates. Characterization results show that Pt modification increased the specific surface area, altered the Mn3+/Mn4+ratio and surface oxygen species, promoted oxygen-vacancy formation, and enhanced CO adsorption and redox properties. These physicochemical changes are correlated with the improved low-temperature CO oxidation activity of Pt-modified Mn–Cu catalysts. This work clarifies the effects of Pt loading and calcination temperature on CO oxidation performance and on the transient response to SO2exposure.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Xin Yu,Xiaoqing Dang,Shijie Li,Yu Li,He Wang,Kairui Jing,Haoyun Dong,Xia Liu
Metal-support interaction has a substantial influence on catalyst activity while little attention has been paid to it in the plasma catalytic system. Herein, the effect of support on the activity of CoMnO X -based catalysts was investigated for trichloroethylene removal by plasma catalysis, and CoMnO X /ZSM-5 exhibited the highest mineralization rate (36.93−94.24 %), HCl and Cl 2 yield (19.66−94.37 %), energy yield (63.29–29 g/kWh), as well as the lowest export ozone concentration (18.72–108.83 mg/m 3 ) under 6–10 kV. The excellent catalytic activity of CoMnO X /ZSM-5 was ascribed to the formation of abundant defects and oxygen vacancies , which was induced by the Si O Co/Mn hybridization promoting Co/Mn O bonds cleavage. CoMnO X /ZSM-5 also exhibited superior adsorption ability, large amount of Co 3+ , Mn 4+ and adsorbed oxygen species, high reducibility and suitable acidity. Moreover, CoMnO X /ZSM-5 maintained superior water-resistant ability and high catalytic activity after 50 h operation. The proposed TCE degradation mechanism suggested that the contribution of plasma active oxygen species was involved in TCE oxidation and oxygen cycle of catalyst. This work provides a novel strategy to design catalysts in plasma catalytic system.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Fan-Fan Wang,Yu-Rui Ji,Yu-Hao Chen,Peng-Fei Wang,Qin-Zhi Lai,Feilong Qiu,Yan-Rong Zhu,Ting-Feng Yi
Li-rich Mn-based oxides (LRMOs) are considered as one of the most-promising cathode materials for next generation Li-ion batteries (LIBs) because of their high energy density . Nevertheless, the intrinsic shortcomings, such as the low first coulomb efficiency, severe capacity/voltage fade, and poor rate performance seriously limit its commercial application in the future. In this work, we construct successfully g-C 3 N 4 coating layer to modify Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 (LMNC) via a facile solution. The g-C 3 N 4 layer can alleviate the side-reaction between electrolyte and LMNC materials, and improve electronic conduction of LMNC. In addition, the g-C 3 N 4 layer can suppress the collapse of structure and improve cyclic stability of LMNC materials. Consequently, g-C 3 N 4 (4 wt%)-coated LMNC sample shows the highest initial coulomb efficiency (78.5%), the highest capacity retention ratio (78.8%) and the slightest voltage decay (0.48 V) after 300 loops. Besides, it also can provide high reversible capacity of about 300 and 93 mAh g −1 at 0.1 and 10C, respectively. This work proposes a novel approach to achieve next-generation high-energy density cathode materials, and g-C 3 N 4 (4 wt%)-coated LMNC shows an enormous potential as the cathode materials for next generation LIBs with excellent performance.
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PubMed
高影响因子
ENERGY & FUELS
·
2019
·
IF 3.021
Jialin Meng,Yufeng Duan,Peng Hu,Yifan Xu,Xinze Geng,Ting Yao,Shaojun Ren,Hongqi Wei
A series of Mn–V–W/TiO2 (Mn–VWT) catalysts were synthesized by the impregnation method and calcinated at different temperatures (300–600 °C). To explore the effects of the reaction temperature, SO2, and H2O on the simultaneous removal performance of elemental mercury (Hg0) and NO, Mn–VWT were investigated by a fixed-bed reaction system. Various techniques (scanning electron microscopy, Brunauer–Emmett–Teller, X-ray diffraction, H2-temperature-programmed reduction, NH3-temperature-programmed desorption, and X-ray photoelectron spectroscopy) were utilized to characterize the samples. The results showed that the catalytic activity of Mn–VWT first increased and then decreased with the increasing calcination temperature. The removal efficiency of Hg0 and NO still had good performance even in low reaction temperature (200 °C), achieving 100 and 82%, respectively. Mn–VWT-400 had the best simultaneous removal performance because of the highest content of the Mn4+, V4+, and chemisorbed oxygen Oα and the best reductive activity at low temperature. Furthermore, SO2 irreversibly inhibited Hg0 and NO removal ability due to the sulfate and sulfite generation on the surface of Mn–VWT-400. Especially, the inhibition effect was more serious if SO2 and H2O coexisted because the rate of sulfate/sulfite was higher than that of the former. In addition, with the increase in reaction temperature, the effect of SO2 and H2O on the removal of Hg0 and NO over Mn–VWT was gradually reduced.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 17
·17373-17382
·
IF 2.914
Liu Xuewei,Gao Minling,Qiu Weiwen,Khan Zulqarnain Haider,Liu Nengbin,Lin Lina,Song Zhengguo
In this study, a novel Fe–Mn–Ce oxide-modified biochar composite (FMCBC) was synthesized via pyrolysis to enhance the adsorption capacity of biochar (BC). Scanning electron microscopy-energy-dispersive X-ray spectroscopy confirmed that Fe, Mn, and Ce were successfully loaded onto the surface of the BC. A series of adsorption experiments showed that the FMCBC exhibited improved adsorption of As(III) in an aqueous environment. The adsorption process was well expressed by the pseudo-second-order kinetic model. The adsorption capacity of FMCBC reached 8.74 mg L −1 , which was 3.27 times greater than that of BC. The pH of the solution significantly influenced the adsorption of As(III), where the amount of As(III) adsorbed by FMCBC was maximized at pH 3. A high phosphate concentration inhibited adsorption, whereas nitrate and sulfate ions promoted As(III) adsorption and increased the FMCBC adsorption capacity. Similarly, with increasing humic acid concentration, the adsorption capacity of FMCBC for As(III) decreased; however, a low concentration of humic acid promoted adsorption. X-ray photoelectron spectroscopy analysis revealed that the adsorption of As(III) by FMCBC occurred through redox and surface complexation reactions. Therefore, FMCBC has excellent potential for purifying arsenic-contaminated water.
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高影响因子
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