JOURNAL OF SOLID STATE CHEMISTRY
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2025
·
IF 3.5
Yinghao Lv,Jiaqi He,Yajie Yang,Meilin Huang,Dawei He,Yongsheng Wang
Supercapacitors are gaining traction in the energy storage sector due to their high power and energy density. MnO 2 is identified as a promising supercapacitors electrode material due to its reversible Faraday reaction and great theoretical specific capacitance. However, its practical performance is hindered by poor electrical conductivity and structural instability. By incorporating Ti 3 C 2 T x , a 2D MXene material known for its high conductivity and functional groups, the electrochemical behavior of the MnO 2 composite is expected to be enhanced. This study introduces a novel method for synthesizing MnO 2 @Ti 3 C 2 T x self-assembled electrodes (1, 3, 6, 9-MnO 2 @Ti 3 C 2 T x composite electrodes) via a simple solution immersion technique at room temperature and ambient pressure. The state of manganese dioxide deposition can be influenced by varying the number of operations of the solution immersion technique. Among them, 6-MnO 2 @Ti 3 C 2 T x has the largest specific surface area and achieves the best specific capacitance of 324.1 F g −1 . When the current density is increased to 10 A g −1 , the specific capacitance retention of 6-MnO 2 @Ti 3 C 2 T x is 67.11 %. Furthermore, the 6-MnO 2 @Ti 3 C 2 T x //Ti 3 C 2 T x asymmetric capacitor demonstrated a maximum energy density of 30.8 W h kg −1 and a power density of 7493.3 W kg −1 , maintaining a capacitance retention rate of 95.98 % (from 74.6 to 71.6F g −1 ) after 2000 charge-discharge cycles. This study presents an effective and scalable synthesis strategy for MnO 2 composite electrodes, highlighting their potential for future energy storage applications.
研究领域:
材料科学
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能源存储
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DOI
高影响因子
Advanced Healthcare Materials
·
2024
·
IF 10
Wanqing Lun,Huajun Wang,Mengyuan Li,Jiuzhi Ma,Yilin Ding,Xiaofei Zheng,Xiaodong Cao,Qingtao Li
Repairing tendon/ligament injuries is a major challenge in sports medicine. It has been reported that tendon injury healing is hindered by massive production of reactive oxygen species (ROS). Manganese oxides nanoparticles are generally non-toxic, can scavenge ROS, promote tissue regeneration, and hold promise for sustainable nanotechnologies. However, the effective and safe integration of MnO 2 nanoparticles on decellularized scaffold mediating tissue repair is still a great challenge. To address these issues, an in situ MnO 2 -modified decellularized scaffold is developed to enhance tendon regeneration through improving microenvironment. The decellularized fibrous membrane is designed and prepared using the central tendon of the porcine diaphragm. Then MnO 2 nanozymes are in situ grown on the collagen fibers using tannic acid (TA) as cross-linking agent and reducing agent. The results showed that MnO 2 -modified scaffold eliminates excessive accumulation of ROS in cells, protects mitochondrial, and maintains the phenotype of tendon cells in an oxidative stress environment. Notably, it is found that the MnO 2 -modified scaffold exhibits good biocompatibility and is able to promote the tendon healing in the rat patellar tendon defect model. Altogether, this study confirmed that this nanozyme-functionalized decellularized extracellular matrix effectively enhanced tendon repair by scavenging ROS, which provides new strategies for enhancing tendon regeneration.
研究领域:
运动医学
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生物材料
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纳米技术
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组织工程
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再生医学
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DOI
PubMed
高影响因子
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
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2015
·Vol. 54
·期 14
·4338-4343
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IF 11.261
Yuxiang Hu,Tianran Zhang,Fangyi Cheng,Qing Zhao,Xiaopeng Han,Jun Chen
Graphical Never say die : Depleted Li–MnO 2 batteries could be further utilized as rechargeable Li–O 2 batteries with admitted oxygen. Thus, when the manganese oxide electrode was lithiated in situ and exposed to air (see picture), the resulting battery showed superior performance, including high capacity, a low overpotential, high rate capability, and high cycling stability. The ever-increasing consumption of a huge quantity of lithium batteries, for example, Li–MnO 2 cells, raises critical concern about their recycling. We demonstrate herein that decayed Li–MnO 2 cells can be further utilized as rechargeable lithium–air cells with admitted oxygen. We further investigated the effects of lithiated manganese dioxide on the electrocatalytic properties of oxygen-reduction and oxygen-evolution reactions (ORR/OER). The catalytic activity was found to be correlated with the composition of Li x MnO 2 electrodes (0< x <1) generated in situ in aprotic Li–MnO 2 cells owing to tuning of the Mn valence and electronic structure. In particular, modestly lithiated Li 0.50 MnO 2 exhibited superior performance with enhanced round-trip efficiency (ca. 76 %), high cycling ability (190 cycles), and high discharge capacity (10 823 mA h g carbon −1 ). The results indicate that the use of depleted Li–MnO 2 batteries can be prolonged by their application as rechargeable lithium–air batteries.
研究领域:
材料科学
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能源技术
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环境科学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
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2021
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IF 6.707
Shiwei Liu,Kai Li,Qingyi Shen,Dandan Shao,Shansong Huang,Youtao Xie,Xuebin Zheng
Electroactive biointerfaces on metallic implants can transduce electrical into ionic signals under exogenous electrical stimulation (ES), which have been proposed to compensate the mislaid bioelectricity signals in bone defects. However, unsatisfied electrical properties and long-term stability are the major issues that hinder their clinical applications. Herein, based on the merits of birnessite-type MnO 2 (the large capacitance and effective surface area) and poly(3,4-ethylenedioxythiophene) (PEDOT, the high conductivity and physicochemical stability), MnO 2 -PEDOT composite nanocoatings (MnO 2 -P1 and MnO 2 -P2) were prepared by coating trace amounts of PEDOT onto the MnO 2 nanocoating surfaces via an in-situ polymerization method. The composite nanocoatings exhibited decreased charge transfer resistance and concurrently enhanced charge storage capacity. More importantly, the MnO 2 -P2 nanocoating with thicker PEDOT layer withstood higher voltages with minor loss of mass and charge injection capacity, thus enhancing mechanical and electrochemical stability. The composite nanocoatings were further applied to MC3T3-E1 osteoblastic cells to enhance their adhesion, proliferation and differentiation with the MnO 2 -P2 showing the greatest enhancement. Enhanced cellular proliferation on the MnO 2 -P2 nanocoating under ES could be ascribed to the combination of the ES-induced Ca 2+ -fibronectin interactions and the limited Mn 2+ release prevented by PEDOT protective layer.
研究领域:
生物材料学
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组织工程学
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DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Jingliang Liu,Fengxia An,Changyin Zhu,Dongmei Zhou
In this study, three different structures of MnO 2 were synthesized and used to activate peroxymonosulfate (PMS) for the degradation of DDT in aqueous solutions. It was found that DDT was efficiently degraded in the MnO 2 /PMS system and the degradation rate was dependent on the properties of MnO 2 including crystal structure (followed the order: α-MnO 2 > γ-MnO 2 > β-MnO 2 ), surface area and Mn(III) content. Sulfate radicals (SO 4 − ) was primarily responsible for the degradation of DDT based on the results of electron paramagnetic resonance (EPR) and quenching experiments. The degradation of DDT was suppressed at alkaline pH because the formation of SO 4 − was inhibited. The results of GC–MS indicated that dichlorobenzophenone, 4-chlorobenzoic acid and benzylalcohol were the dominant intermediates for DDT degradation. The possible pathways of DDT degradation were proposed according to the identified products.
研究领域:
环境科学
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化学
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2020
·Vol. 55
·期 23
·10022-10034
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IF 3.553
Qu Fei,Yan Hang,Li Kexin,You Jinmao,Han Wenli
Covalent organic frameworks (COFs) are usually synthesized by virtue of Schiff base reaction between amino and aldehyde groups. Owing to their electron-rich property, COFs are widely applied to detect electron-deficient nitroaromatic explosives through photoinduced electron transfer mechanism. However, except for these cases, the COFs-based chemosensors are rarely reported for the analysis of electron-rich biomolecules. In this work, a fluorescent platform constructed by COFs and MnO 2 nanosheets is developed for sensitive detection of glutathione (GSH). It is found that the fluorescence of COFs can be effectively quenched by MnO 2 nanosheets. The quenching mechanisms involving inner filter effect and static quenching effect are discussed in detail. Due to the reducing ability of GSH, it can trigger the reduction of MnO 2 to Mn 2+ , accompanying with the fluorescence recovery of COFs. The linear range of GSH is achieved from 0.5 to 100 µM with a detection limit of 0.28 µM. This method is further applied for GSH detection in human serum samples with satisfactory results.
研究领域:
生物化学
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分析化学
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材料科学
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DOI
高影响因子
Analytical Methods
·
2016
·Vol. 8
·期 11
·2366-2374
·
IF 1.915
Zongen Liu,Xiaohui Cai,Xuefang Lin,Yanjie Zheng,Yangting Wu,Pingping Chen,Shaohuang Weng,Liqing Lin,Xinhua Lin
Graphene quantum dots (GQDs) exhibit strong photoluminescence, biocompatibility, and low toxicity and can easily functionalize surfaces to improve the detection of biomolecules. As-prepared MnO2 nanosheets were applied in the fabrication of GQDs–MnO2 composite to develop a signal-on fluorescent platform for sensing glutathione (GSH). The fluorescence of the GQDs was quenched by MnO2 in the GQDs–MnO2 composite as a result of fluorescence resonance energy transfer within the composite. The fluorescence of GQDs was restored when GSH was introduced because GSH reduced the MnO2 nanosheets into Mn2+ and released GQDs. Under the optimized conditions, the concentration of GSH can be accurately detected with high sensitivity and specificity in Tris–HCl buffer and simulated serum. The proposed sensing strategy was successfully used to measure GSH in the range of 1–1000 μM with a detection limit of 0.45 μM. In addition, GSH in reduced glutathione injection and reduced glutathione tablets can be determined accurately using the proposed method. GQDs–MnO2 composite is thus a promising GSH fluorescence sensor for the analysis of complex systems and for quality control in the pharmaceutical industry.
研究领域:
分析化学
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生物医学工程
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药物分析
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Haoyu Li,Huan Yao,Xinyi Sun,Chuanchao Sheng,Wei Zhao,Jianghua Wu,Shiyong Chu,Zhaoguo Liu,Shaohua Guo,Haoshen Zhou
Due to the rapid development of energy storage systems from the goal of carbon neutrality, rechargeable aqueous Zn-MnO 2 batteries have attracted growing attention. While the controversy surrounding various mechanisms, such as Zn 2+ insertion, Zn 2+ /H + co-insertion and Mn dissolution/deposition, leads to limitation of MnO 2 cathodes, especially for the β-MnO 2 . Though showing promising performance in recent works, the reaction process and influence factors of β-MnO 2 cathodes are still under debate. In this work, a complete MnO 2 /Mn 2+ redox chemistry is proposed to explain the abnormal electrochemical behaviors of β-MnO 2 cathodes, which indicates the reversible dissolution/deposition of layered manganese oxides appears after the initial MnO 2 dissolution reaction. The revealed effects of interfacial environment in regulating the electrochemical reactions also provide a new perspective for studying the working mechanism of aqueous Zn-MnO 2 batteries. Besides, the high specific capacity shown in the MnO 2 /Mn 2+ redox chemistry also contributes to designing high-performance cathodes for AZIBs.
研究领域:
材料科学
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电化学
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DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Yanmei Liang,Danhua Zhu,Shixing Chao,Meihua Hu,Danqin Li,Weiqiang Zhou,Jingkun Xu,Xuemin Duan,Peipei Liu
In term of supercapacitors application, MnO 2 has been recognized as a popular pseudocapacitive material on account of its environmental friendliness, cost inexpensive, plentiful abundance and high theoretical capacitance. However, its inherently low conductivity and structural instability lead to low specific capacitance and short cycle life, which greatly limit its development. Rare-earth doping can manipulate the size, shape, and crystallographic phase of doped nanomaterials . For the sake of hoisting the supercapacitors performance of MnO 2 , herein, we synthesized europium-doping MnO 2 (Eu 5% -MnO 2 ) ultrathin nanosheets (3.4 nm) possessing rich oxygen vacancies via a facile co-precipitation strategy. The specific capacitance of Eu 5% -MnO 2 at 1 A g − 1 is 361.2 F g − 1 and remains 100% after 10,000 cycles, outperforming of MnO 2 nanosheets (198 F g −1 , 82.8%). The reason of enhancing performance may be mainly correlation to the heighten conductivity, boosted surface reactivity and electrochemical active sites. The assembled Eu 5% -MnO 2 //AC device at 1 A g −1 can reach 63.36 F g −1 with high voltage of 3 V and exerts 19.8 Wh kg −1 of energy density when the power density is 373.2 W kg −1 . This synthesis technique is a simple and convenient means for the development of high-performance MnO 2 -based energy storage electrodes.
研究领域:
材料科学
·
能源存储与转换
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Ziyin Yang,Zhigao Tian,Chengcheng Qi
The development of a high-performance electrocatalyst is the key to the construction of highly sensitive electrochemical sensing methods. In this work, we design Ru nanoclusters supported on MnO2 nanotubes (c-Ru/MnO2) as an electrocatalyst for boosting electrochemical nonenzymatic hydrogen peroxide (H2O2) sensing. c-Ru/MnO2 is synthesized based on a facile hydrothermal method, followed by cation exchange and calcination. The obtained c-Ru/MnO2 nanocomposite is characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and electrochemical methods. Electrochemical studies and theoretical calculations reveal that the anchoring of Ru nanoclusters not only makes MnO2 nanotubes exhibit higher electrochemical surface area and faster electron transfer rate but also promotes the strong adsorption of H2O2 and optimizes the interactions with the key intermediates OOH*/OO*. Thanks to the synergistic effect between Ru nanoclusters and MnO2 nanotubes, the sensor based on c-Ru/MnO2 exhibits a low anode peak potential of 0.42 V and an extremely high sensitivity of 2967.9 μA mM–1 cm–2 toward H2O2. Therefore, c-Ru/MnO2 is demonstrated to be an advanced electrocatalyst for sensitive electrochemical sensing of H2O2.
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DOI
高影响因子
MATERIALS LETTERS
·
2023
·
IF 3
Siqi Li,Yanan Wei,Qiong Wu,Yuan Han,Rongmei Liu,Guixiang Qian,Chao Yang
The spiny spherical MnCO 3 @MnO 2 cathode material for aqueous zinc ion batteries was designed and constructed. Electrochemical test results revealed that, the spiny spherical MnCO 3 @MnO 2 cathode material had an initial discharge capacity of 598.2 mAh/g at a current density of 0.2 A/g. As the current density increased with the gradient and then decreased to 0.2 A/g, the specific capacity remained at 541.5 mAh/g, indicating the superior performances compared to that of MnCO 3 . This research showed that this spiny spherical MnCO 3 @MnO 2 has distinctive structural characteristics and can easily embed zinc ions, demonstrating a competitive cycle stability in aqueous systems.
研究领域:
材料科学
·
电化学
·
能源存储
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产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 9
·1-11
·
IF 6.232
Ye Mingshu,Lin Bixia,Yu Ying,Li He,Wang Yumin,Zhang Li,Cao Yujuan,Guo Manli
By using graphene quantum dots (GQDs) and o -phenylenediamine (OPD), a ratiometric fluorescence probe was designed for the highly sensitive and selective detection of AChE. GQDs with strong fluorescence were synthesized by the one-step hydrothermal method. The optimal emission wavelength of GQDs was 450 nm at the excitation wavelength of 375 nm. MnO 2 nanosheets with a wide absorption band of 300–600 nm were prepared at room temperature. Because of the extensive overlap between the absorption spectrum of MnO 2 nanosheets and the excitation and emission spectra of GQDs, the fluorescence of GQDs at 450 nm was efficiently quenched by the inner-filter effect. Meanwhile, due to the peroxidase-like activity of MnO 2 nanosheets, OPD was catalytically oxidized to 2,3-diaminophenazine (oxOPD), a yellow fluorescent substance with a new emission peak at 572 nm. When AChE was present, the substrate acetylthiocholine (ATCh) was hydrolyzed to thiocholine (TCh) that is capable of decomposing MnO 2 nanosheets. Therefore, the quench of GQDs and the oxidation of OPD by MnO 2 nanosheets were suppressed, resulting in the fluorescence recovery of GQDs at 450 nm, while the fluorescence decrease of oxOPD at 572 nm. Utilizing the fluorescence intensity ratio F 450 /F 572 as the signal readout, the ratiometric fluorescence method was established to detect AChE activity. The ratio F 450 /F 572 against the AChE concentration demonstrated two linear relationships in the range 0.1–2.0 and 2.0–4.5 mU mL −1 with a detection limit of 0.09 mU mL −1 . The method was applied to the detection of positive human serum samples and the analysis of the inhibitor neostigmine. Due to the advantages of high sensitivity, favorable selectivity, and strong anti-interference, the method possesses an application prospect in clinical diagnosis of AChE and the screening of inhibitors.
Schematic presentation of a ratiometric fluorescence method for the detection of acetylcholinesterase (AChE). The fluorescence of graphene quantum dots (GQDs) is quenched and o -phenylenediamine (OPD) is oxidized to generate fluorescent product 2,3-diaminophenazine (oxOPD) by MnO 2 nanosheets. When AChE is present, acetylthiocholine iodide (ATCh) is hydrolyzed to thiocholine (TCh) with reducibility for decomposing MnO 2 nanosheets. Due to the decomposition of MnO 2 nanosheets, the quenching of GQDs and oxidation of OPD are suppressed. The fluorescence of GQDs at 450 nm is enhanced, while the fluorescence of oxOPD at 572 nm is reduced. The fluorescence intensity ratio F 450 /F 572 is used to establish the ratiometric fluorescence method for AChE activity.
研究领域:
生物化学
·
分析化学
·
医学诊断
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）