ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Jiajie Li,Quan Kuang,Gang Wang,Qiuchen Lu,Pan Jiang,Qinghua Fan,Youzhong Dong,Yanming Zhao
To meet the application requirements of different scenarios, expanding the selection of cathode materials is a crucial step for the development of aqueous zinc-ion batteries (AZIBs). Manganese phosphates are a type of important and representative cathodes for rechargeable batteries, but they are rarely reported in AZIBs due to their electrochemical sluggishness in aqueous zinc electrolyte. Herein, carbon coating technic and galvanostatic stimulation process are combined to solve the issue and obtain an electrochemically active Na 3 Mn 2 (P 2 O 7 )(PO 4 ) as cathode material for AZIBs. Carbon coated Na 3 Mn 2 (P 2 O 7 )(PO 4 ) (NMPP@C) is synthesized by using a liquid-phase method assisted with freeze-drying process. After galvanostatic stimulation (100 mA g −1 for 5 cycles and following at 10 mA g -1 ), the originally inactive NMPP@C cathode shows a peak capacity of 150 mAh g -1 and then stabilizes at 90 mAh g −1 with a discharge plateau at 1.45 V vs. Zn 2+ /Zn. It is found that the NMPP@C cathode undergoes a structural decomposition during stimulation process, then α-MnO 2 and Zn 2 P 2 O 7 •5H 2 O jointly serve as electrochemical reaction agents eventually. The electron/proton host (α-MnO 2 ) and the Zn 2+ host (Zn 2 P 2 O 7 •5H 2 O) are generated from the same conductive matrix of NMPP@C, which guarantees a satisfactory rate ability and a decent cycle performance in AZIBs.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Yuming Tu,Gaoyan Shao,Wenjing Zhang,Jianjie Chen,Yixin Qu,Fan Zhang,Shichao Tian,Zhiyong Zhou,Zhongqi Ren
Printing and dyeing wastewater generally has high pH, high turbidity , poor biodegradability , complex composition, and high chroma, which make it one of the most difficult industrial wastewaters to treat. Herein, heterogeneous ozone oxidation technology is applied to oxidize and degrade printing and dyeing wastewater. A metal oxide catalyst supported on activated carbon (γ-MnO 2 /AC) was prepared by hydrothermal synthetic method and shown to enable synergistic catalysis involving MnO 2 metal sites and N/C sites. A simulated methyl orange solution was used to determine the effects of various preparation and operation parameters. The results confirmed that the γ-MnO 2 /AC catalyst exhibited good chemical oxygen demand (COD) removal and reusability. Additionally, γ-MnO 2 /AC demonstrated excellent degradation of the secondary biochemical effluent of printing and dyeing wastewater (COD removal = 72.45% within 120 min). The γ-MnO 2 /AC catalyst was fully characterized, and the mechanism governing its catalytic ozone oxidation process was investigated experimentally.
研究领域:
环境科学
·
催化材料
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高影响因子
MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 3
·1-8
·
IF 5.7
Yu Yao,Li Yansong,Xu Ning,Zha Yonghong,Bai Xue,Liu Mingyuan,Zhou Yu,Liu Xiaolei
Fumonisin B1 (FB1) is one of the important mycotoxins posing health risks in the area of food safety. A sensitive fluorescence ratio immunoassay has been established for FB1 based on the growth of monodispersed 2-D MnO 2 nanosheet on an individual gold nanoparticle (AuNP@MnO 2 ). FB1 competed with the coated FB1-BSA to bind the FB1 monoclonal antibody. After a washing step, alkaline phosphatase-labeled goat anti-mouse IgG (ALP-IgG) with high catalytic activity was combined with FB1 monoclonal antibody. ALP reacts with ascorbic acid 2-phosphate (AAP) to produce ascorbic acid (AA), which decomposes AuNP@MnO 2 to dehydroascorbic acid (DHAA). O-Phenylenediamine dihydrochloride (OPD) is oxidized to yellow-fluorescent substrate of 2,3-diaminophenazine (DAP) (excitation, 423 nm; emission, 570 nm) by AuNP@MnO 2 . Meanwhile, OPD can also be reduced to blue fluorescent substrate of OPDred (excitation, 350 nm; emission, 430 nm) by DHAA. The content of FB1 can be determined by fluorescence ratio of blue/yellow. The limit of detection (LOD) of the fluorescence ratio immunoassay for FB1 was 0.06 ng mL −1 , and the linear range was from 0.25 to 60.00 ng mL −1 . The effectiveness of the assay was verified in real maize samples, and satisfactory recoveries were attained. The correlation coefficient of these results between the fluorescence ratio immunoassay and commercial ELISA kit was 0.9999. This method provides a sensitive and selective tool for the detection of FB1 in maize samples. Graphical Abstract
研究领域:
食品安全
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分析化学
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纳米技术
·
毒理学
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DOI
PubMed
高影响因子
JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
·
2022
·
IF 5.062
Cheng Wang,Li Liu,Shaoqing Chen,Pengfei Cui,Shuwen Zhou,Lin Qiu,Pengju Jiang,Jianhao Wang,Xinye Ni
The ongoing development of nuclear technologies, especially in medical diagnosis, calls for attention to radiation protection. Herein, a MnO 2 nanozyme with peroxidase activity was synthesized using hemoglobin (HGB) as the reducing agent and with a facile one-method method. The HGB-MnO 2 nanozyme showed good dispersity and near spherical morphology with size of about 5 nm . In addition, the HGB-MnO 2 nanozyme showed high colloidal stability and decent scavenging ability on different radicals (DPPH, ABST, hydroxyl, and superoxide radicals). Therefore, the HGB-MnO 2 nanozyme can effectively lower the intracellular ROS level, reduce the DNA damage and maintain the cell viability of HUVECs under X-ray irradiation. The in vivo experiments using C57BL/6J mice as the model also revealed a longer survival time in HGB-MnO 2 nanozyme treated group under X-ray radiation without causing observable damage to the subjects. Therefore, HGB-MnO 2 nanozyme can be considered as an effective and safe formulation for radiation protection.
研究领域:
纳米技术
·
辐射生物学
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材料科学
·
生物医学工程
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DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Weitao Shi,Feifan Hong,Renhuan Li,Ruolin Zhao,Sizhi Ding,Ziqi Liu,Peilin Qing,Yi Fan,Haizhen Liu,Jin Guo,Zhiqiang Lan
MgH 2 is a promising high-capacity solid hydrogen storage material. In this work, MnO 2 -doped Ti 3 C 2 (Ti 3 C 2 @MnO 2 ) was synthesized and used as a catalyst to improve the hydrogen storage performance of MgH 2 . We found that the dehydrogenated 10 wt% Ti 3 C 2 @MnO 2 -doped MgH 2 sample exhibited good hydrogen adsorption ability even at room temperature (30 °C), and could absorb 5.13 wt% of hydrogen in 400 s at 75 °C. The re‑hydrogenated Ti 3 C 2 @MnO 2 -doped MgH 2 sample started to release hydrogen at 182 °C and required 484 s to completely release hydrogen at 275 °C with a dehydrogenation capacity of 6.4 wt%. The Ti 3 C 2 @MnO 2 composite did not change the thermodynamic properties of MgH 2 . In the MgH 2 + Ti 3 C 2 @MnO 2 sample, Ti 3 C 2 , TiO 2 , MnO 2 , MnO, and Mn combined with MgH 2 to form Ti 3 C 2 /MgH 2 , TiO 2 /MgH 2 , MnO 2 /MgH 2 , MnO/MgH 2 , and Mn/MgH 2 multiphase interfaces, which improved the hydrogen storage performance of MgH 2 . The findings of this work may provide a new strategy for preparing novel and efficient catalysts for hydrogen storage applications.
研究领域:
材料科学
·
能源存储
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DOI
高影响因子
CATALYSIS LETTERS
·
2019
·Vol. 149
·期 7
·2032-2042
·
IF 2.372
Wang Ying,Shen Shuguang,Li Meina,Sun Yujuan,Li Binbin,Ma Xueping,Zhou Zijian,Guo Chenyuan
Abstract MnO 2 was screened from various metal oxides and different crystal structures of MnO 2 were prepared, which were used to hydrolyze urea process wastewater for energy conservation and environmental protection. The characterizations of XRD, SEM, Raman, FT-IR, XPS and H 2 -TPR were employed and the hydrolysis experiments were carried out, demonstrating that oxygen vacancy on the surface of MnO 2 might be the catalytic activity source on urea hydrolysis. By optimizing reaction influencing factors, the residual urea concentration reduced to 1.61 mg/L over α -MnO 2 , far below the effluent standard. Meanwhile, the temperature of heterogeneous hydrolysis over α-MnO 2 dropped drastically compared with that of thermal hydrolysis. Further, the kinetic parameters of hydrolysis were obtained over α -MnO 2 . And α -MnO 2 also showed excellent recycling ability on the reused test. Graphical Abstract
Effect of different crystal structures MnO2 on urea degradation rate. (Catalyst dosage is 50 g/L, reaction time is 60 min, temperature is 165oC.)
研究领域:
环境化学
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催化科学
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废水处理
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材料化学
·
绿色能源
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DOI
高影响因子
ACS Applied Engineering Materials
·
2026
·
IF 3.5
Hao Zhang,Anming She,Junxi Zhang,Zhenxiao Bi,Qing Chen,Hehua Zhu
Cement-based structural batteries offer an attractive pathway for integrating energy storage technologies into civil infrastructure. However, their practical application is severely constrained by capacity degradation caused by the dissolution of trivalent manganese (MnOOH) under alkaline conditions. This study proposes a zeolite-coated cathode strategy to suppress manganese dissolution, thereby achieving highly durable MnO2/Zn cement-based batteries. The zeolite porous framework complex traps free trivalent manganese ions [Mn(OH)6]3– and promotes uniform migration of OH– within the poly(vinyl alcohol)-cement matrix. The optimized MnO2 material enhances electrolyte wetting and reduces interfacial charge transfer resistance. The zeolite-induced effect enables the MnO2 electrode to exhibit highly reversible conversion reactions and stable morphological evolution during cycling. The assembled structural battery achieves high Coulombic efficiency and cycling stability, retaining 56.21% capacity after 300 cycles in the freshly prepared system and 77.09% capacity after 300 cycles following 28 days of cement curing. This study establishes a universal interfacial stabilization strategy through zeolite coating, opening promising avenues for developing energy-storage building materials suitable for long-life infrastructure.
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高影响因子
Materials
·
2026
·Vol. 19
·期 8
·1504
·
IF 3.7
Deju Gao,Yuhan Du,Junjie Deng,Zhengxin Gan,Wei Zhang,Yuxiao Lai,Yuanchi Zhang
Treatment of postsurgical osteosarcoma remains one of the major challenges in orthopedic clinics. Conventional implants often fail to address complex pathological issues, including irregular bone defects, residual tumor cells, and delayed bone regeneration. Herein, this study reports a multifunctional shape-memory polyurethane (SMPU)/manganese dioxide (MnO2) composite that provides adaptive support, antitumor activity, and osteogenic bioactivity. SMPU was synthesized by introducing 1,4-butanediol (BDO) and dimethylolpropionic acid (DMPA) as chain extenders at a specific ratio. Commercial MnO2nanoparticles were incorporated as both a photothermal agent and a bioactive component to achieve multifunctionality. As designed, a coordination system was formed between the polymer chains and MnO2nanoparticles within the composites. The influence of MnO2content was systematically investigated. Although increasing MnO2amounts improved photothermal and mechanical performance, excessive incorporation adversely affected the molecular structure and compromised the composite’s biocompatibility. By adjusting the MnO2content, the composites were demonstrated to possess robust mechanical performance, good shape-memory behavior, and controllable Mn2+release. Additionally, the composites exhibited tunable photothermal performance under near-infrared (NIR) irradiation. Furthermore, in vitro studies confirmed that the composites containing 4 wt% MnO2could eliminate tumor cells via photothermal effects and promote the osteogenic differentiation of human bone marrow-derived mesenchymal stem cells (hBMSCs). Overall, the SMPU/MnO2composites had superior multifunction for treating irregular bone defects following bone tumor surgery.
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DOI
PubMed
高影响因子
Carbon Neutralization
·
2025
·Vol. 4
·期 3
·e70014
·
IF 12
Dai-Huo Liu,Chunyan Xu,Fang Xu,Yaozhi Liu,Ao Wang,Cheng Yun,Mengqin Song,Jialin Zheng,Liang Wang
The lattice distortion resulting from the Jahn–Teller effect (JTE) at the Mn redox center typically induces irreversible phase transitions and structural degradation, which in turn diminishes the reversible capacity and long-term cycling performance. Here, N-doped carbon quantum dots (N-CDs) grafted to the surface of 3 × 3 tunnel todorokite-type MnO 2 (TMO) nanosheet (abbreviated to TMO@N-CDs) are designed. The adsorption of N-CDs promoted the charge transfer and redistribution between Mn and O and promoted the closer electron cloud overlap between Mn and O, thus enhancing the bonding strength of Mn–O bonds, stabilizing the lattice structure, inhibiting JTE, and realizing reversible H + /Zn 2+ storage. Meanwhile, a significant amount of N-CDs can increase active sites of TMO nanosheet, enhance the binding ability with metal ions, and accelerate the ion diffusion kinetics, thus realizing stable electrochemical performances. The density functional theory (DFT) calculation shows that there is obvious orbital overlap between Mn and O in [MnO6] octahedron, which further quantifies the strong interaction between Mn and O through interphase synergy between N-CDs and TMO. The reversible (de)insertion behavior dominated by H + during charging and discharging was proved by operando XRD and ex-situ SEM. As expected, the obtained TMO@N-CDs cathode exhibits remarkable electrochemical properties in terms of high reversible capacity, good rate performance, and satisfactory cycling stability (after 1000 cycles, the specific capacity remains 96.02%).
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Yanmei Nie,Yifei Yan,Boning Wu,Tianlang Wen,Tao Wan,Linping Yu
Lithium metal, a widely recognized anode material for next generation high energy density batteries, is hindered by challenges such as dendrite growth and interfacial instability. Lithiophilic MnO 2 based current collectors have demonstrated potential in regulating lithium deposition. However, the critical relationship between MnO 2 phase selection, structural stability, and electrochemical performance remains poorly understood. In this study, we employ density functional theory (DFT) calculations to guide the fabrication of MnO 2 based current collectors, followed by a dual functional modification strategy through reductive and conductive polydopamine (PDA) integration. This approach synergistically enhances both the electronic conductivity and structural stability of δ-MnO 2 . The reductive nature of PDA induces partial conversion of Mn 4+ to Mn 2+ , generating oxygen vacancies (Ovs) that facilitate Li + diffusion, while its conjugated polymer framework significantly improves electrical conductivity. The optimized electrode achieves uniform lithium deposition with an average coulombic efficiency (CE) of 98.5% over 300 cycles at 1 mA cm −2 . This work presents a novel theoretical and experimental approach to designing durable, dendrite suppressing current collectors, representing a significant step toward practical lithium metal batteries.
研究领域:
储能
·
材料科学
·
电化学
·
计算化学
·
电池技术
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产品关联
DOI
高影响因子
ChemNanoMat
·
2024
·Vol. 10
·期 12
·e202400157
·
IF 2.6
Guohua Pan,Hanxiao Bao,Jinguo Zhang,Jue Hou,Jun Zhou,Hongzhen Bai,Guping Tang
Manganese dioxide (MnO 2 ) nanoparticles are increasingly recognized for their potential in biomedical applications, particularly in the realm of hypoxic cancer therapy, due to their unique physicochemical characteristics. This investigation introduces a novel, template-free synthesis strategy. The reducing groups inherent in bovine serum albumin (BSA) facilitate a redox reaction with potassium permanganate (KMnO 4 ), while the abundance of functional groups in BSA is instrumental in the formation of MnO 2 . The transmission electron microscopy (TEM) analysis has characterized the synthesized MnO 2 nanoparticles, termed BM NPs, as spherical particles with a mean diameter of 210 nm and zeta potential of −40.1 mV measured by dynamic light scattering (DLS). The Fourier transform infrared (FT-IR) spectrum of BM NPs exhibits the characteristic peak of MnO 2 at 1113 cm −1 and 620 cm −1 . Furthermore, the elemental composition of BM NPs has been ascertained through energy-dispersive X-ray (EDX) elemental mapping analysis. Though concentration of BM NPs up to 200 μg/mL, the survival rate of 4T1 cells remained approximately 75 %. Given that BM NPs at a concentration of 100 μg/mL significantly alleviate cellular hypoxia, the high oxygen-generating capacity of these nanoparticles is proved, suggesting their suitability as a drug delivery system, especially in the context of hypoxic tumor microenvironments.
研究领域:
纳米医学
·
癌症治疗
·
生物材料
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产品关联
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2025
·
IF 3.5
Yang Luyao,Zou Xuehua,Wang Hanlin,Chen Tianhu,Liu Haibo,Sun Fuwei,Chen Dong
Birnessite-type (δ-MnO 2 ) exhibits a high adsorption and catalytic performance to remove organic contaminants, but it still suffers from agglomerates, low specific surface area, and uneven distribution of active sites. Here, a novel birnessite-loaded biochar (δ-MnO 2 @BC, MBC) was prepared by chemical precipitation and used for the catalytic degradation of tetracycline under visible light. The biochar provides a large number of birnessite loading sites, which increases the specific surface area of the material, and reduces the electron–hole pair complexation rate. Photocatalytic results showed that under optimal conditions, 91.89% of TC could be degraded by 20% MBC(m(δ-MnO 2 )/m(BC) = 20%) at a pH value of 3.0, with a negligible effect by solid–liquid ratio and temperature. Our evidences demonstrate that photogenerated electrons and holes serve as the key active species, whereas superoxide radicals play a supplementary role. The MBC photocatalyst exhibits excellent stability, maintaining an 85% TC removal efficiency after five recycling cycles. In addition, the proposed degradation pathways of TC were presented, suggesting a partial mineralization by visible light photocatalysis using MBC. This study provides new ideas for the treatment of antibiotic wastewater with manganese oxides and biochar materials. Graphical abstract
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高影响因子
危险品化学品经营许可证（带存储）