JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Fuping Song,Juping Zhang,Dongfang Li,Tao Zhu,Xing Zhu,Hua Wang
Oxidative dehydrogenation (ODH) of ethylbenzene is a promising process for styrene production. However, its application is limited by product overoxidation and purification requirements due to the co-feeding of mild oxidants. Herein, we report a facile manganese-based catalyst (K/Mn 3 O 4 -Al 2 O 3 ) and achieve competitive styrene selectivity of 88 % and ethylbenzene conversion of 95 % at 450 ℃ (84 % yield vs. ∼ 60 % yield in commercial dehydrogenation process at 600 ℃) under a cyclic redox ODH scheme. The introduction of Al 2 O 3 into MnO x restructures composite oxides and depresses bulk lattice-oxygen migration for the partial oxidation of ethylbenzene. The surface modification using potassium creates reactive sites and regulates surface properties, achieving ethylbenzene activation and high conversions. Highly active lattice oxygen in catalysts after bulk and surface modifications selectively converts ethylbenzene to styrene and water. This study provides an understanding of roles of manganese-based catalysts in styrene generation and offers a strategy to modulate lattice oxygen on catalysts.
研究领域:
催化化学
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材料科学
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DOI
高影响因子
Catalysts
·
2022
·Vol. 12
·期 10
·1267
·
IF 4.501
Ju Gao,Xu Dong,Zhenguo Li,Yuankai Shao,Xiaoning Ren,Kaixiang Li,Yiren Lu
Thermal catalytic oxidation technology is an effective way to eliminate refractory volatile organic pollutants, such as Benzene. Nevertheless, a high reaction temperature is usually an obstacle to practical application. Here, GdMn2O5mullite (GMO-H) catalyst with disordered surface Gd-deficient and oxygen-vacancy-rich concentrations was synthesized via a controllable low-temperature acid-etching route. Results show that the preferentially broken Gd-O bond is conducive to exposing more Mn-Mn active sites, which Gd species covered. The affluent surface oxygen vacancies supply sufficient adsorption sites for oxygen molecules, facilitating the oxygen cycles during Benzene catalytic oxidation. Furthermore, surface exposed Mn3+species were oxidized to Mn4+, which is beneficial to increase catalytic activity at a lower temperature. Compared with the conventional GdMn2O5, the reaction temperature for removing 90% Benzene over GMO-H was dropped from 405 to 310 °C with WHSV of 30,000 mL g−1h−1. Significantly, during a 72 h catalytic test, the catalytic activity remains constant at 90% of the Benzene removal at 300 °C, indicating excellent activity stability. This work reported an efficient approach to preparing manganese-base mullite thermal catalyst, providing insight into the catalytic oxidation of Benzene.
研究领域:
环境科学
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催化化学
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材料科学
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DOI
高影响因子
Energy & Environmental Science
·
2024
·Vol. 17
·期 11
·3807-3818
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IF 32.4
Shenyang Xu,Zhefeng Chen,Wenguang Zhao,Wenju Ren,Chenxin Hou,Jiajie Liu,Wu Wang,Chong Yin,Xinghua Tan,Xiaobing Lou,Xiangming Yao,Zhihai Gao,Hao Liu,Lu Wang,Zuwei Yin,Bao Qiu,Bingwen Hu,Tianyi Li,Cheng Dong,Feng Pan,Mingjian Zhang
As commercial cathodes with the highest practical capacity, the structural nature of Li-rich Mn-based (LMR) cathodes, composite or solid solution, is still under debate. Due to the extreme structural similarity of two layered-phase components, namely, the monoclinic phase (C2/m) and rhombohedral phase (Rm), no single tool can resolve this concern alone. Herein, we combined multiple advanced techniques to comprehensively study the structural changes during synthesis of LMR cathodes from different aspects such as the elemental distribution, local structure, long-range structure, and short-range structure, revealing a clear process from the formation of two phases to the gradual phase fusion and eventually to a nearly solid solution. Particularly, X-ray pair distribution function (PDF) analysis combined with theoretical simulations reveals for the first time that the transition metal (TM)–TM distance increases with the progress of the phase fusion, which makes the short-range structural change in TM–TM atomic pairs an effective parameter for judging the extent of phase fusion. Eventually, excellent electrochemical performance was achieved by balancing capacity and cycling stability through adjusting the phase fusion to a medium extent in lithium and sodium two layered-phase components. This study establishes an approach to investigate the structural evolution in the complicated multiple-phase system and provides valuable insights into the design and optimization of cathodes by tuning the phase fusion extent.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
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2020
·Vol. 31
·期 42
·424004
·
IF 3.551
Shengjian Jiao,Dongfeng Xue
Ever-increasing global energy consumption has increased aggregate demand on electrochemical energy storage devices with high energy density. Over the past few decades, manganese oxides have attracted wide attention due to their abundant reserves, low cost, environmental friendliness, and high theoretical capacity. However, most reported manganese-based materials have exhibited capacity far below the theoretical capacity, which was only on the basis of Mn3+/Mn4+ couple. The rich chemistry of manganese enables it to exist in various valence states, such as Mn0, Mn2+, Mn3+, Mn4+, and Mn7+, providing great opportunity for discovering new manganese-based electrode systems. Herein, we formed a Mn2+/Mn4+ couple from a manganese-based colloidal system with rare earth (RE) modification, which was formed in-situ on nickel (Ni) foam in KOH electrolyte under an electric field assistance. The Mn-based colloidal electrode, with Mn:Ce mass ratio of 1:0.5, achieved a high specific capacitance of 2985 F g–1 at 3 A g–1, which was higher than the theoretical capacity of 2193 F g–1 on the basis of the Mn3+/Mn4+ couple. After the addition of Ce3+, the prepared sample exhibited improved rate capability performance. Our manganese-based colloidal electrode with RE modification delivered a high specific capacitance of 1223 F g–1 at 20 A g–1, with 54.5% retention of 2243 F g–1 at 3 A g–1 at Mn:Ce mass ratio of 1:0.05. Colloidal electrode systems involving Mn-based colloids are a novel way to engineer the electrochemical performance of inorganic materials.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysts
·
2024
·Vol. 14
·期 12
·885
·
IF 3.8
Yulin Sun,Yiwei Zhang,Baoqing Hou,Yong He,Wubin Weng,Yanqun Zhu,Zhihua Wang
Formaldehyde (HCHO) is known as one of the important indoor organic pollutants. How to remove and decompose the low concentration of formaldehyde at room temperature is important for indoor environments. Catalytic ozonation is an efficient method to thoroughly remove HCHO at room temperature, with high efficiency and few byproducts. A series of MnOx/γ-Al2O3catalysts were prepared in this work via the impregnation method and treated with different reagents (acid, alkali, and H2O2) to evaluate their catalytic activity for HCHO removal. The results showed that MnAl-II (acid treatment) performed well in activity tests, reaching a nearly 100% HCHO conversion at an O3/HCHO of 2.0 and attaining a CO2selectivity of above 95% at an O3/HCHO of 3.0 at 30 °C, with almost no ozone residual existing. The larger specific surface area, abundant oxygen vacancies, and higher number of acid sites contributed to the excellent performance of MnAl-II. Stability and H2O resistance tests of MnAl-II were also conducted. To reveal the intermediate product formation and further investigate the reaction mechanism of HCHO ozonation, in-situ DRIFTS measurement was carried out combined with DFT calculations.
研究领域:
环境科学
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催化化学
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产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2024
·
IF 5.4
Lixiong Qian,Rui Huang,Haoran Zhang,Shengxue Yan,Shaohua Luo
Co-free Fe/Mn-based cathodes have become a popular choice for sodium-ion batteries (SIBs) due to their affordability and impressive theoretical capacity. Nevertheless, the issue of their terrible battery life and rate capability continues to be their hindrances. A set of three-factor, three-level orthogonal experiments was adopted, including the calcination temperature, calcination time, and heating rate. And two single-factor experiments were carried out to further optimize the preparation conditions. Finally, the optimal conditions were obtained as follows: the calcination temperature was 900 °C, the calcination time was 12 h, and the heating rate was 5 °C min–1. The layered oxide cathode material Co-free P2-Na2/3Fe1/2Mn1/2O2 was synthesized by the solid phase method. Under the control of the optimal conditions, the P2-Na2/3Fe1/2Mn1/2O2 cathode could yield a remarkable initial discharge specific capacity (179.3 mAh g–1, 0.1 C) and cycle stability (54.6% over 50 cycles). These findings further declared that it was feasible to design Co-free Fe/Mn-based cathode materials with superior performance, which might offer guidance for popularizing cost-effective Fe/Mn-based cathode materials in the future.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 13
·期 1
·399-408
·
IF 10.7
Qiangfeng Zhang,Shijie Xu,Haipeng Zhu,Zhao Chen,Libao Chen,Chunxiao Zhang,Weifeng Wei
High-voltage lithium-rich manganese-based oxides (LRMOs) are expected to become next-generation mainstream cathodes due to their higher voltage, higher specific capacity and lower cost. However, currently commercialized carbonate electrolytes still face the challenge of poor decomposition of solvents and lithium salts at high voltage, leading to serious interface side reactions and electrochemical performance degradation. Herein, we propose an interfacial chemical modification strategy based on the dual additives of fluoroethylene carbonate (FEC) and tris(trimethylsilyl)phosphate (TMSPa), to promote Li+ migration and ensure long-term cycling stability of LRMO-based batteries. Detailed characterization reveals that the dual additives FEC-TMSPa can promote the desolvation process of Li+ and reduce the adverse decomposition of electrolyte components by regulating the solvation structure of the electrolyte. Simultaneously, dual additives can facilitate the formation of a robust cathode electrolyte interphase (CEI)/solid electrolyte interphase (SEI) rich-in F/P/Si species, thereby reducing the interface side reactions, inhibiting the erosion of acidic substances on electrodes, and promoting the uniform deposition/stripping of Li+. As a result, the high-voltage LRMO-based batteries exhibit excellent rate performance and cycling stability, with a capacity retention of 82.36% after 500 cycles at 30 °C, and 86.9% after 150 cycles at a high-temperature of 55 °C, suggesting that the proposed strategy of synergistically regulating the interface chemistry with multiple additives is anticipated to facilitate the further application of high-voltage layered cathode materials.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2025
·
IF 7.2
Hongtao Wu,Gaole Yan,Xiangyue Liu,Gang Yang
Manganese-based lithium-ion sieves (LISs) exhibit remarkable potential for lithium extraction from salt lakes owing to their excellent adsorption properties and high selectivity. However, manganese dissolution severely limits the industrial application of manganese-based LISs. Herein, a series of molybdenum (Mo)-doped manganese-based LISs (LMMO-X%) with high adsorption capacity were synthesised using the sol-gel method. Results indicate that the introduction of Molybdenum atom enhances the Mn(IV) content in the material while promoting the growth of the (111) crystal plane of Li 4 Mn 5 O 12 and suppressing the growth rates of the (110) and (100) crystal planes. Compared to the undoped ion sieve, the lithium adsorption capacity of the Mo-doped material increased from 35.56 to 44.63 mg/g, while the manganese dissolution rate decreased from 3.79 % to 2.63 %, considerably improving the overall performance of the LIS adsorbent. X-ray diffraction and X-ray photoelectron spectroscopy confirmed that Mo was successfully doped into the material, increasing the Mn(IV) content from 35.3 % to 56.5 %, enhancing the structural stability of the material and alleviating the Jahn–Teller distortion during the acid elution process. In addition, the adsorption process follows a pseudo-second-order kinetic model and the Langmuir isotherm adsorption model. In competitive salt solutions, LMMO demonstrates excellent selectivity for Li + and retains 80.73 % of its adsorption capacity after 10 cycles. This study provides a novel strategy for enhancing the structural stability of doping-modified materials.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Biomaterials Science & Engineering
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2025
·
IF 5.5
Yang Zhang,Han Wang,Ke Liu,Ruimeng Sun,Yurou Wang,Jiayu Guo,Wenxiang Zhou,Haoran Zheng,Yanfei Qi
Acute renal injury (AKI) has a high incidence rate and mortality, but current treatment methods are limited. As a kind of nanomaterial with enzyme-like activity, nanozyme has shown outstanding advantages in treating AKI according to recent reports. Herein, we assess the potential of manganese-based nanozymes (MnO2–BSA NPs) with excellent biosafety in effectively alleviating AKI. Our findings in vitro and in vivo reveal that MnO2–BSA NPs exert regulatory effects on oxidative stress, inflammation, and apoptosis. These effects are mediated through activation of the Nrf2/HO-1 and PI3K/Akt/NF-κB pathways. Notably, it was observed that the cytoprotective effect of MnO2–BSA NPs is abrogated upon inhibition of Nrf2 expression, highlighting the important role of this transcription factor in cellular protection. In summary, the study demonstrates the protective effect of MnO2–BSA NPs in AKI and provides the molecular mechanisms involved, which can contribute to the advancement of potential therapeutic interventions for nanozyme-based treatments.
研究领域:
医学
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生物化学
·
纳米医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-11
·
IF 15.7
Lai Guojun,Zhao Zequan,Zhang Hao,Hu Xueting,Lu Bingan,Liang Shuquan,Zhou Jiang
Engineering the formulation of an Mn-based positive electrode is a viable strategy for producing an efficient aqueous zinc-ion battery. However, Mn dissolution and the byproducts result in capacity fading, thus limiting its electrochemical performances. To solve the undesirable issues, the concept of in-situ forming the positive electrode/electrolyte interface on the commercial MnO 2 is designed, with the help of introducing the Dioctyl Phthalate into the ZS-based electrolyte (2 M ZnSO 4 + 0.2 M MnSO 4 ), designated as ZS-DOP electrolyte. An advanced three-dimensional chemical and imaging analysis on a model material reveals the dynamic formation of positive electrode/electrolyte interface. The formed organic interface effectively suppresses the corrosion of the electrolytes with its hydrophobicity, and adjusts the pH value according to Le Chatelier’s Principle to inhibit the production of by-products. Specifically, the pouch cell assembled with the ZS-DOP electrolyte attains a reversible capacity of ~2.5 Ah and powers the unmanned aerial vehicle. Furthermore, photovoltaic energy storage applications deliver a stable capacity of 0.5 Ah and realize the power supply for mobile phones and other electronic devices. Our results facilitate the development of in-situ surface protection on the positive electrode in aqueous zinc-ion battery, providing insights into its practical application.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Yi Chen,Xuedan Xie,Jiangtao Jing,Yonghua Wang,Danfeng Cui,Dan Liu,Chenyang Xue
The combination of pseudocapacitive electrodes with ionic liquid (IL) electrolytes demonstrates a significant synergistic effect in expanding the potential window of supercapacitors, thereby enhancing the energy density of the device. Mn 3 (HHTP) 2 , a metal-organic framework (MOF) with high-density redox-active sites and hierarchical porosity, serves as the electrode material paired with [EMIM][BF 4 ] and [EMIM][TFSI] IL electrolytes. The ion size in [EMIM][TFSI] can be precisely aligned with the electrode pore size, thereby reducing interfacial resistance and enhancing ion accessibility. Optimizing the [EMIM][TFSI]/acetonitrile mass ratio to 4:6 achieves superior electrolyte properties, including an ionic conductivity of 50.4 mS cm −1 and viscosity of 5.24 mPa·s. This design extends operating potential from 8 V to 13 V, increasing energy density to 108.0 Wh kg −1 , representing a 68.8 % improvement over baseline systems. The device retains 94.34 % capacitance after 2000 cycles at 8 V, with specific capacitances of 7.2 F g −1 at 8 V and 4.6 F g −1 at 13 V. These findings establish a new paradigm for interface engineering in high-voltage supercapacitors.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 33
·期 5
·2211191
·
IF 19.924
Yangyang Cai,Siyu Yan,Xinran Du,Tingting Lin,Yue-jian Lin,Longzhen Qiu,Weizhi Wang
2D perovskite is an organic–inorganic hybrid material with good photoelectric properties, generally prepared by using organic groups as isolation molecules. In this study, using manganese chloride and potassium halide as raw materials, all-inorganic 2D lead-free perovskites are prepared by the Bridgeman melting and cooling method. Different from the 2D perovskites synthesized by organic spacer molecules, the prepared all-inorganic 2D perovskites have smaller layer spacings and good crystallization performance due to the use of potassium halide as spacer molecules. They are direct bandgap semiconductors and their energy bandgaps are tuned by the different types of potassium halides. High degree orientation crystal thin films with (001) lattice plane parallel to silicon wafer substrate are prepared by double-source evaporation. The physical morphology of the films is characterized by grazing angle X-ray diffraction, transmission electron microscopy, and electron diffraction. The field effect transistors prepared from these 2D films show excellent electronic characteristics. The mobility of the optimized device is ≈24 cm 2 v −1 s −1 and the on/off ratio reaches 10 5 . This study reveals the potential of lead-free manganese 2D perovskite as a high-performance perovskite field effect transistor.
研究领域:
材料科学
·
半导体物理
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）