IONICS
·
2024
·Vol. 30
·期 8
·4479-4486
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IF 2.4
Tang Anping,Chen Juedong,Xu Guorong,Song Haishen,Wang Jinglun,Chen Hezhang
Non-intercalation cathode materials based on nanocomposites of lithium fluoride and Li-free transition metal compounds have drawn attention as materials for fabricating the cathode of lithium ion batteries owing to their high theoretical specific capacities and high redox voltages. In the present study, a nanocomposite of MnO-LiF was in situ synthesized by a quick annealing at 500 °C for just 5 min using a mixture of ammonium fluoride, manganese acetate, and lithium acetate as precursor. The synthesized composite is investigated by X-ray diffraction, scanning electron microscopy, nitrogen sorption, and charge-discharge measurements. As a lithium-ion battery cathode, it delivers respectively an initial discharge-specific capacity of 170 mAh g −1 and a discharge-specific capacity of 137 mAh g −1 in the 50th cycle at a current rate of C/20, which is equivalent to a moderate capacity retention rate of 80.6%. The novel synthesis approach proposed offers access to electrochemically active composites of lithium fluoride and Li-free transition metal oxides.
研究领域:
材料科学
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电化学
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纳米复合材料
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能源存储
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锂离子电池
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 5
·5781-5789
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IF 2.478
Han Dandan,Shen Ye,Zhao Yuan,Pan Yifan,Wei Jinhe,Wei Yen
In this work, hierarchically porous MnO/carbon (MnO/C) microsphere materials were fabricated by a facile two-step approach. The MnO precursors and the polymerization of dopamine were synthesized simultaneously by chemical solution method at room temperature. The dopamine plays a key role in the formation of MnO/C, which guides the growth of porous spherical structures and acts as a carbon source. The enhancement of electrochemical properties and electrical conductivity strongly depend on the porous structure of the composite electrodes. Benefiting from the unique structures, the optimized MnO/C electrode delivered a high specific capacitance of 378 F·g −1 at 0.1 A·g −1 and retained over 96.66% of its initial capacitance after 1000 cycles at 1 A·g −1 , suggesting that MnO/C hybrid material has promising potential for practical supercapacitors.
研究领域:
材料科学
·
能源存储与转换
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DOI
高影响因子
Catalysts
·
2019
·Vol. 9
·期 11
·911
·
IF 3.444
Tianming Liu,Guobao Yuan,Guocheng Lv,Yuxin Li,Libing Liao,Siyao Qiu,Chenghua Sun
Microwave-induced catalytic degradation (MICD) has been considered as one of the most prospective approaches to remove organic contaminants from water. High-performance catalysts, ideally offering efficient degradation ability, are essential to this process. This work reports the fabrication of manganese oxide on carbon nanotubes (MnO/CNTs) as an efficient catalyst under microwave irradiation (MI) to remove tetracycline (TC) from aqueous solution. The hybrid MnO/CNTs structure shows excellent performance in TC degradation. Combining experimental characterization and theoretical calculations, synergistic mechanisms are revealed: (i) Strong MnO/CNTs interaction stabilizes Mn(II) through interfacial bonding; (ii) high-spin states associated with low coordinated Mn(II) play a major role in MICD; and (iii) superoxide radicals (•O2−) and hydroxyl radicals (•OH) induced by microwave input are identified as the major active species.Keywords:microwave-induced;manganese oxide;catalysts;tetracycline;degradation
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Peifeng Yu,Jianxian Zhou,Mingtao Zheng,Mianrui Li,Hang Hu,Yong Xiao,Yingliang Liu,Yeru Liang
Aqueous zinc ion battery constitutes a safe, stable and promising next-generation energy storage device, but suffers the lack of suitable host compounds for zinc ion storage. Development of a facile way to emerging cathode materials is strongly requested toward superior electrochemical activities and practical applications. Herein, defect engineering, i.e. , simultaneous introduction of nitrogen dopant and oxygen vacancy into commercial and low-cost MnO, is proposed as a positive strategy to activate the originally inert phase for kinetically propelling its zinc ion storage capability. Both experimental characterization and theoretical calculations demonstrate that the nitrogen dopant significantly improves the electric conductivity of electrochemical inert MnO. Simultaneously, the oxygen vacancy creates sufficient large inserted channels and available activated adsorption sites for zinc ions storage. These synergistic structural advantages obviously ameliorate the electrochemical performance of inert MnO. Therefore, even without any conductive agent additive, the as-prepared material shows high specific capacity, superb rate capability, prolonged cycling stability and attractive energy density, which are dramatically superior to those of the pristine MnO as well as many other host cathode materials. This work presents fresh insights on the role of defect engineering in the enhancement of the intrinsic electrochemical reactivity of inert cathode, and an effective strategy for scalable fabrication of high-performance cathode for zinc ion battery.
研究领域:
材料科学
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电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Mengyao Hua,Siyi Wang,Meng Cheng,Guangming Liang,Yafen Zhou,Lei Xu,Guofang Zhang
Photocatalysts UiO-66-(OH) 2 /MnO 2 -TiO 2 with intimate contact interfaces were successfully synthesized by impregnation methods and all of the composites were characterized by a variety of analytical techniques. The results indicated that MnO 2 and TiO 2 form a heterojunction and tightly attached to the surface of UiO-66-(OH) 2 , the generation of MnO 2 -TiO 2 heterojunction improved the catalyst electron-hole separation efficiency, and there was a strong electronic interaction between MnO 2 -TiO 2 and UiO-66-(OH) 2 in the composite. The synergistic combination of high adsorption capacity of UiO-66-(OH) 2 , and efficient interfacial charge transfer between UiO-66-(OH) 2 and MnO 2 -TiO 2 have a significant impact on the enhanced photocatalytic performance for formaldehyde removal. Meanwhile, the hydroxyl radicals (·OH) and superoxide radicals (·O 2 - ) also play a major role in removal of formaldehyde. The formaldehyde removal rate of 70UO/MnO 2 -TiO 2 (1 g 0.15 m 3 ) in self-made closed system under high pressure mercury lamp irradiation is 88.19 % within 5.5 h, if the removal time is extended to 24 h, the formaldehyde removal rate can reach 95.19 %, and the continuous photocatalytic reaction showed that the composite is a highly stable catalyst.
研究领域:
环境科学
·
材料科学
·
催化
·
纳米技术
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化学工程
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Mingrui Geng,Zhizhen Wang,Denghui Wang
Formaldehyde (HCHO), a ubiquitous indoor organic pollutant, severely threatens human health. Developing efficient and low-energy catalytic materials for room-temperature HCHO purification remains an urgent priority. In this work, Fe y MnO x catalysts were synthesized via a facile coprecipitation method. The Fe doping effectively modulated the morphology and crystallinity of δ-MnO 2 while inducing the formation of surface oxygen vacancies, thereby enhancing the capability to generate surface reactive oxygen species. Under a gas hourly space velocity (GHSV) of 150 L·g cat –1 ·h –1 , the catalyst achieved > 99 % removal efficiency for 100 ppm HCHO, along with exceptional stability. In situ DRIFTS reveals the influence of Fe doping on the catalytic reaction pathway for HCHO. This work demonstrates that the Fe doping strategy successfully optimizes the microstructure and surface chemical properties of δ-MnO 2 , resulting in outstanding room-temperature HCHO removal performance, providing valuable insights into defect engineering for optimizing transition metal oxide catalysts.
研究领域:
环境催化
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材料科学
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室内空气净化
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过渡金属氧化物
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缺陷工程
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Zhibo Yan,Yixuan Tao,Guangrui Liu,Jie Yin,Juan Li,Wenpin Wang,Jie Wu,Zhongcheng Li
Suffering from their low conductivity, Mn-base oxides are commonly inactive in H–OH activation. Generally, tailoring the coordinate environment of materials could induce variation in the atomic arrangement and further influence their chemical activity. Herein, we propose a feasible strategy to mediate the electronic structure of Mn-based oxides by facile hydrothermal method and thermal reduction route. Compared with MnO 2 sheets, the as-synthesized Ru/MnO–Mn 7 C 3 /N-doped carbon sheets (Ru/MnO–Mn 7 C 3 /NC) exhibit the higher activity for both acidic (73 mV) and alkaline water reduction reaction (44 mV@10 mA/cm 2 ). Benefitting from unique structures, Ru/MnO–Mn 7 C 3 /NC sheets show the better freshwater/seawater oxidation reactivity, exceeding RuO 2 . The strong interaction of MnO–Mn 7 C 3 heterostructures, Ru, and N-doped carbon endows Ru/MnO–Mn 7 C 3 /NC with the good freshwater and seawater dissociation performance, outperforming most of the reported Mn-based oxides.
研究领域:
材料科学
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电化学
·
催化科学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Xu Liu,Yanping Liu,Minghao Jin,Chenxi Xu,Yushan Tian,Miao Zhou,Wei Wang,Gangyong Li,Zhaohui Hou,Liang Chen
Owing to high theoretical capacity, low cost and abundant availability, manganese oxides are widely viewed as promising anodes for lithium–ion batteries (LIBs). Nonetheless, their practical application is significantly hindered by poor electrical conductivity, sluggish reaction kinetics and substantial volume change. In this work, an ingenious polypyrrole encapsulation followed by pyrolysis strategy is proposed to produce N–doped carbon encapsulated Mn 2 O 3 /MnO heterojunction (Mn 2 O 3 /MnO@NC) by using mechanically ground Mn 3 O 4 /C 3 N 4 mixture as the precursor. The results show that the selection of precursor plays a pivotal role in the successful preparation of Mn 2 O 3 /MnO@NC hybrid. It is revealed that the uniform encapsulation by N–doped carbon significantly enhances the conductivity and structural stability of the final product. Concurrently, the Mn 2 O 3 /MnO heterojunction within the resultant hybrid exhibits a unique quantum–dot size, which effectively shortens ion transport pathways and exposes the active sites for lithium storage. Additionally, experimental observations and theoretical calculations demonstrate that the built–in electric fields generated at the interfaces of Mn 2 O 3 /MnO heterojunction accelerate the charge transfer and ion diffusion, thereby enhancing the electrochemical reaction kinetics. As a result, the Mn 2 O 3 /MnO@NC hybrid displays much enhanced lithium storage performance. Evidently, our work offers a good guidance for the design and synthesis of advanced transition metal oxide/carbon anodes for LIBs.
研究领域:
材料科学
·
能源存储
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产品关联
DOI
PubMed
高影响因子
POLYMER
·
2021
·
IF 4.43
Wancai Guo,Xutong Guo,Lei Yang,Tianyou Wang,Minghua Zhang,Gaigai Duan,Xianhu Liu,Yiwen Li
Although tremendous efforts have been devoted to manganous oxide (MnO)-based hybrid electrode materials , the rational design and facile preparation of high-performance MnO hybrid supercapacitors are still full of challenges, due to the inevitable agglomeration and limited stability of MnO within carbon matrixes. In this work, we developed a direct one-pot polymerization method to synthesize a series of Mn ion doped polylevodopa [P( L- DOPA)] synthetic melanin nanoparticles (Mn@SMNPs) for further transforming into small-sized hybrid carbon nanoparticles (MnO@CNPs, 20–80 nm) consisting of many stable Mn-related chemical bindings (C–N–Mn). The obtained MnO@CNPs electrode materials with physically spatial protection and well distribution of MnO could display high specific capacitance values (e.g., 545 F g −1 at 0.5 A g −1 in 6 M KOH electrolyte) within a wide operation voltage of 1.3 V. This work will continue to provide an inspiration towards the fabrication of the next-generation of high-performance synthetic melanin-based energy storage materials and devices.
研究领域:
材料科学
·
能源存储
·
化学工程
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Zhuoran Sun,Wenjing Song,Hongli Chen,Lili Li
Designing and constructing reversible and stable anode materials was vital to lithium/sodium-ion batteries. Here, multiple carbon-protected Mn and Fe based composite anode with three-dimensional cross-linked networks was designed. The MnFe 2 O 4 composite nanoparticles were synthesized via co-precipitation firstly. Then by combining different coating technologies and heat treatment, MnO/Fe 3 C with stable carbon doped (MnO/Fe 3 C@C 3 ) composite anode for lithium/sodium-ion storage was prepared. The results showed that MnO/Fe 3 C@C 3 exhibited the excellent reversible capacities of 608.2 mAh g −1 at 0.2 C after 100 cycles and 348.2 mAh g −1 at 10 C after 1500 cycles for lithium-ion battery. MnO/Fe 3 C@C 3 as sodium-ion anode also showed the capacity of 282.4 mAh g −1 at 0.2 C after 100 cycles. The study indicated that MnO/Fe 3 C as active components were produced by the doped carbon participating in redox reaction. In addition, the stable doped carbon was also formed by the binding of graphitic carbon with carbon layers. GITT and EIS tests revealed that the addition of MWCNTs could effectively enhance the ion transport kinetics and further optimize the electrochemical performance. This study highlighted a way to construct the active component with stable doped carbon as anode, which could exhibit the excellent recyclability and electrochemical performance.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2026
·
IF 9.2
Xintong Li,Zhichuan Yang,Shenglong Li,Min Gao,Yu Liu
Although remarkable progress has been achieved in electrocatalytic water splitting, the design of highly efficient bifunctional catalysts remains a significant challenge, mainly because of the slow kinetics of the oxygen evolution reaction (OER) and the limited stability of non-precious metal catalysts. This work presents a novel heterojunction catalyst consisting of Co–MnO nanocubes anchored on nitrogen-doped graphitic carbon derived from carbonized Ganoderma lucidum mycelium (CGLM), synthesized via an ion-exchange-coupled pyrolysis strategy. The unique fibrous entanglement morphology of CGLM offers ideal anchoring sites for catalytic centers, while preserving its intrinsic three-dimensional porous architecture to establish a continuous conductive network. This structural enhances electron transport efficiency and promotes stable immobilization of Co–MnO nanocubes (Co–MnO -2 /CGLM). Extensive experimental and theoretical investigations demonstrate that the Co–MnO -2 heterogeneous interface induces charge redistribution, synergistically optimizes the hydrogen adsorption free energy (Δ G H = −0.15 eV), and reduces the OER energy barrier, with a rate-determining step of Δ G 4 = 1.69 eV. The catalyst demonstrates remarkable bifunctional activity in alkaline media, exhibiting overpotentials of 105 mV for hydrogen evolution reaction (HER) at 10 mA cm −2 and 250 mV for OER at 50 mA cm −2 . Notably, the assembled electrolytic cell (Co–MnO -2 /CGLM||Co–MnO -2 /CGLM) achieves a voltage of only 1.61 V (50 mA cm −2 ) in overall water-splitting tests and maintains excellent durability, with negligible change in current density during prolonged operation. This study highlights the synergistic effect of heterogeneous structure engineering combined with biomass-derived carbon substrates in reducing reaction barriers and facilitating charge transfer, offering novel perspectives on the design of cost-effective electrocatalysts for sustainable energy conversion.
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Ehsan Ullah,Ali B.M. Ali,Muhammad Zia Ullah Shah,Shenghui Guo,A. Shah,Yannan Zhang,Peng Dong,Hassan M.A. Hassan,Talal M. Althagafi,Sameerah I. Al-Saeedi,Rakhmonov
Metal oxides have been widely studied as an efficient and robust electrode material for supercapacitors for a couple of decades due to their affordability, high capacitance, multiple oxidation states, pseudocapacitive nature, and excellent redox activity. In this paper, a SnO 2 -MnO 2 hierarchical nanostructure (HNS) composite has been developed via a cost-effective and straightforward hydrothermal reaction. FESEM and TEM analysis revealed flower-like and nanowire-like morphologies for SnO 2 and MnO 2 , respectively , with highly pure, crystalline tetragonal structure. The average size of SnO 2 microflowers and MnO 2 nanorods is 1.5 μm and 2.3 μm. The chemical composition and oxidation states of the samples were investigated using Energy-Dispersive X-ray (EDX) and X-ray Photoelectron Spectroscopy (XPS), specifying the adequate formation of the SnO 2 -MnO 2 HNS composite. The surface area and pore analysis of the samples reveal that the SnO 2 -MnO 2 HNS composite yields the highest BET surface area of 62.93 m 2 /g with mesoporous features centered at ~9 nm. Remarkably, at a low current rate of 1 A/g, the SnO 2 -MnO 2 HNS composite achieved a high capacitance of 520 F/g as compared to pure SnO 2 and MnO 2 in a three-electrode mode assembly at identical conditions. The emergence of heterointerfaces enhanced the capacitance of the composite by providing more surface area for charge transfer and storage at the electrode/electrolyte interface. An asymmetric hybrid supercapacitor (HASC) was constructed utilizing two pseudocapacitive electrode materials: a SnO 2 -MnO 2 HNS composite as the anode and FeSe 2 as the cathode, represented as SnO 2 -MnO 2 ||FeSe 2 . The fabricated HASC attained a high specific capacitance of 111 F/g, a high energy density of 44.5 Wh/kg, and a power density of 852 W/kg at 1 A/g. At higher current rates, the power density extends to 4153 W/kg, with an energy density of 15 Wh/kg. Similarly, notable stability was observed, with 93.5% capacitance retention after 10,000 cycles during HASC assembly. Therefore, metal oxides are extensively explored as electrode materials for supercapacitors, and their superiority remains a top priority for researchers and engineers in the design of viable and renewable energy technologies.
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DOI
高影响因子
危险品化学品经营许可证（带存储）