IONICS
·
2024
·Vol. 30
·期 10
·6047-6059
·
IF 2.4
Jin Duolong,Dong Xiaoping,Liu Jiankai,Pang Qianran,Xin Shenghai,Yang Liying,Wang Cuibiao
With the continuous development of new energy application technology, there is an increasingly urgent need for the safety and affordability of new energy storage products. In recent years, aqueous zinc-ion batteries based on mild aqueous electrolytes have garnered widespread attention as a potential replacement for traditional lithium-ion batteries. However, the limited capacity and low operating voltage of aqueous zinc-ion batteries restrict their widespread application. For this reason, sulfuric acid was added to the electrolyte, which effectively promotes the two-electron conversion of MnO 2 /Mn 2+ during the discharge process. This enhancement results in the high voltage segment of the batteries’ discharge phase offering a higher reversible specific capacity. The results showed that the batteries with 0.1 M H 2 SO 4 added to the electrolyte had a reversible discharge-specific capacity of up to 536.07 mAh·g −1 at a current density of 100 mA·g −1 . The activated batteries exhibited a reversible specific capacity of 85.11 mAh·g −1 even at a high current density of 1 A·g −1 . Furthermore, the capacity retention rate after 1000 cycles was 88.3%. Moreover, the activation rate of the batteries was faster with the addition of H 2 SO 4 , and the average operating potential increased compared to the batteries without H 2 SO 4 in the electrolyte. This provides an effective solution for the practical application of aqueous zinc-ion batteries in power grids.
研究领域:
电化学
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能源存储技术
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材料科学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Lei Han,Shi Gang Liu,Jia Yu Liang,Nian Bing Li,Hong Qun Luo
Glutathione (GSH) plays a critical role in the living system and its abnormalities are closely associated with numerous clinical diseases. Thus, monitoring and detecting the content of GSH in the living system is still of great importance. Herein, a novel dual-signal responsive optical sensor is developed by using resonance Rayleigh scattering (RRS) and colorimetry for sensitive detection of GSH. In this sensor, MnO 2 nanoflakes are used as both GSH recognizer and signal transducer of RRS and colorimetry. The solution of MnO 2 nanoflakes shows strong RRS and absorption signals because MnO 2 nanoflakes possess a large surface area and high molar extinction coefficient. However, MnO 2 can be reduced to Mn 2+ and MnO 2 nanoflakes can be etched to small nanoparticles by GSH, causing both the RRS and absorption signals to decrease. Based on the change of RRS signal and absorbance of MnO 2 nanoflakes, a novel dual-signal responsive optical sensor is successfully constructed to detect the content of GSH. The as-developed optical sensor toward GSH presents a favorable sensitivity with a detection limit of 0.033 and 0.67 μM for RRS and colorimetry, respectively. Furthermore, the as-developed approach is straightforward, quickly responsive, free-label, and cost-effective. More significantly, this method combines the advantages of RRS and colorimetry for the detection of GSH. Beyond this, the proposed RRS method has also been successfully utilized to detect the content of GSH in glutathione injection samples.
研究领域:
分析化学
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生物传感器
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纳米技术
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Chengfu Deng,Zhibing He,Jinglin Huang,Lei Liu,Yansong Liu,Tao Wang,Guo Chen,Yong Yi,Kai Du
Aqueous asymmetric sodium-ion supercapacitors (ASSCs) with high energy density assembled from all-inorganic materials are expected to provide high-efficiency power sources for intelligent electric vehicles and off-grid systems. However, it is still challenging to fabricate high-performance positive materials by a simple method and rationally assemble ASSCs to meet the demand of ultralong cycle life and high energy/power density. Here, a simple pre-activation strategy was introduced into the α-MnO 2 electrode with a microcrystalline nanosheet structure to improve the Na-storage performance. The sodium-ions concentration was optimized by tuning charge-discharge parameters. Impressively, the pre-activated electrode achieved superior capacitance retention after 10,000 cycles, high volumetric capacitance of 377 F cm −3 and low charge transfer resistance of 5.9 Ω. Based on the facile operability of the proposed pre-activation strategy, it can be expected to be easily ported to other Li/K/Zn-storage, providing a novel avenue for the exploration of positive electrode materials with outstanding electrochemical behaviors. A novel ASSC was fabricated by matching α-MnO 2 //WO 3 electrodes, exhibiting wide voltage of 2.0 V, high energy/power density (0.965 W h cm −3 /65.2 W cm −3 ) and ultralong cycle life. This work proposes a simple strategy to develop high-performance positive materials and assemble ASSC with high energy/power density and long-term stable operation.
研究领域:
电化学
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材料科学
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能源存储
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 12
·1-10
·
IF 6.232
Zhong Yingying,Li Qing-lan,Lu Minglei,Wang Tiantian,Yang Huiyi,He Qiyi,Cui Xiping,Li Xiangguang,Zhao Suqing
A highly sensitive colorimetric sensing strategy based on enzyme@metal-organic framework (GAA@Cu-MOF) and IrO 2 /MnO 2 nanocomposite was exploited innovatively for screening of α-glucosidase (GAA) inhibitors. IrO 2 /MnO 2 nanocomposite exhibits excellent oxidase-mimicking activity which can directly catalyze the oxidation of 3,3 , 5,5 , -tetramethylbenzidine (TMB) into a blue product with an absorption maximum at 652 nm. And GAA@Cu-MOF can decompose L-ascorbic acid-2-O-α-D-glucopyranosyl (AAG) to ascorbic acid (AA). The produced AA can destroy the IrO 2 /MnO 2 nanocomposite and reduce its oxidase-like activity. However, the generation of AA is restricted when GAA inhibitors are added to the system, which allows the oxidase-like activity of the IrO 2 /MnO 2 nanocomposite to be maintained. In view of this, a method for screening of GAA inhibitors was developed. In addition to enhancing the stability of GAA, the method can also effectively avoid the potential interference of H 2 O 2 in the screening process of GAA inhibitors, which helps to improve the sensitivity of the method. Therefore, highly sensitive determination for acarbose and ascorbic acid are achieved with detection limits of 6.27 nM and 1.23 μM, respectively. The proposed method was successfully applied to screen potential GAA inhibitors from oleanolic acid derivatives.
Graphical abstract
研究领域:
生物化学
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药物开发
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分析化学
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产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2025
·
IF 2.6
Jintao Yi,Zhenhua Wu,Nani Fu,Xianqin Han,Ting Yan,Jiaying Zheng
Amoxicillin (AMO), a broad penicillin antibiotic, has been widely employed for the treatment of bacterial infections. However, the unreasonable use of amoxicillin may cause a serious threat to human health and its visual determination remains a challenge. Herein, a MnO2@CQDs probe was used for the dual-mode detection of AMO, which was synthetized by CQDs doped in MnO2 nanosphere. In the colorimetric mode, MnO2@CQDs oxidized colorless 3, 3ʹ, 5, 5ʹ-tetramethylbenzidine (TMB) into yellow oxidized TMB (oxTMB). In the presence of AMO, the AMO could deoxidize oxTMB to cause multiple color changes from yellow to colorless. In the fluorescence mode, MnO2@CQDs initially exhibited quenched fluorescence due to the presence of MnO2. Upon the addition of AMO, MnO2 was reduced to Mn2⁺ ions, then CQDs were released and recovered fluorescence at the emission wavelength of 450 nm. The colorimetry detection range was wide from 0.005 to 0.09 μM, and the detection limit was 1.6 nM. With increasing concentration of AMO, the color changed from yellow to colourless which allowed naked eye observation. The fluorescence method was rapid, requiring only 1 min, and exhibited a linear detection range from 0.003 to 0.045 μM, with a detection limit as low as 1 nM. In addition, a paper-based sensing platform was constructed, where fluorescence intensity transitioned from dark to blue with increasing AMO levels. The RGB analysis demonstrated that AMO concentration could be discriminated effectively using a smartphone-assisted detection system. The MnO2@CQDs sensor showed excellent selectivity and specificity for AMO colorimetric and fluorescence detection. Moreover, the probe exhibited good practicability in tap water, milk and serum, with results comparable to those obtained by high-performance liquid chromatography. Overall, the MnO2@CQDs dual-mode probe provides an efficient, convenient and rapid strategy for the visual and quantitative detection of AMO in complex environments.
研究领域:
分析化学
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环境监测
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食品安全
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生物传感
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纳米材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Discover Nano
·
2023
·Vol. 18
·期 1
·1-14
·
IF 0
Shao Runrun,Qiao Xiaofang,Cao Linlin,Man Jianliang,Guo Lingyun,Li Lanlan,Liu Wen,Li Lihong,Wang Bin,Guo Lixia,Ma Sufang,Zhang Boye,Wang Haojiang,Yan Lili
The development of nanoparticles capable of inducing reactive oxygen species (ROS) formation has become an important strategy for cancer therapy. Simultaneously, the preparation of multifunctional nanoparticles that respond to the tumor microenvironment is crucial for the diagnosis and treatment of tumors. In this study, we designed a Molybdenum disulfide (MoS 2 ) core coated with Manganese dioxide (MnO 2 ), which possessed a good photothermal effect and could produce Fenton-like Mn 2+ in response to highly expressed glutathione (GSH) in the tumor microenvironment, thereby generating a chemodynamic therapy (CDT). The nanoparticles were further modified with Methoxypoly(Ethylene Glycol) 2000 (mPEG-NH 2 ) to improve their biocompatibility, resulting in the formation of MoS 2 @MnO 2 -PEG. These nanoparticles were shown to possess significant Magnetic Resonance Imaging (MRI) and Computed Tomography (CT) imaging capabilities, making them useful in tumor diagnosis. In vitro and in vivo experiments demonstrated the antitumor ability of MoS 2 @MnO 2 -PEG, with a significant killing effect on tumor cells under combined treatment. These nanoparticles hold great potential for CDT/photothermal therapy (PTT) combined antitumor therapy and could be further explored in biomedical research.
研究领域:
生物医学工程
·
纳米技术
·
癌症治疗
·
医学成像
✓ 已验证
DOI
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Bang-Bang Liu,Xue-Jie Zhao,Lin-Song Li,Peng-Wei Chen,Dong Cheng,Wen-Qi Zhu,Wenhao Zhang,Peng Yuan,Mei-Xia Zhao
In solid tumors, chronic lack of blood and oxygen (O 2 ) causes hypoxia, which diminishes tumor cell sensitivity and contributes to unfavorable outcomes. To address this issue, we synthesized manganese dioxide MnO 2 on gold nanorods (GNR), a system designed to undergo straightforward degradation within the tumor microenvironment (TME). The nano platform facilitates the controlled release of drugs within the TME and mitigates hypoxia to enhance photodynamic therapy for hepatocellular carcinoma. The unique mesoporous structure of the nanoplatforms allows for the loading of indocyanine green (ICG) and Doxorubicin (DOX), which serve as near-infrared (NIR)-mediated photodynamic reagents. When applied to hepatocellular carcinoma, MnO 2 rapidly degrades within the TME, efficiently releasing DOX and ICG. Additionally, the agent induces the decomposition of endogenous hydrogen peroxide abundant in hepatocellular carcinoma, thereby facilitating highly efficient chemo/photothermal/photodynamic therapy.
研究领域:
纳米技术
·
肿瘤学
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生物医学工程
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药剂学
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光化学
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Ruiqi Huang,Yingfeng Qin,Yanqin Huang,Zengqiong Huang,Gao-Jie Ye
6-mercaptopurine (6-MP) is widely used in the treatment of many diseases, but exhibits some serious side effects due to its toxicity. Therefore, it is important and imperative to effectively control and monitoring concentration of 6-MP. Herein, we designed a smartphone-assisted colorimetric sensing platform for 6-MP detection, based on an excellent β-cyclodextrin modified MnO 2 nanosheets (β-CD@MnO 2 NNS) mediated oxidase-like activity. β-CD@MnO 2 NNS can directly oxidizes 3,3′,5,5′-tetramethylbenzidine (TMB) into oxidized TMB with color changes, yielding more than 3-fold higher oxidase-like catalytic activity compared with individual MnO 2 NNS. After adding 6-MP, β-CD@MnO 2 NNS can be reduced to Mn 2+ and lose their oxidase-like properties, resulting in a color and absorbance change for sensitive and selectivity detection of 6-MP. Meanwhile, the smartphone-based color recognition application can intuitively and simply measure the concentration of 6-MP. The limits of detection UV–vis instrument and smartphone were 0.35 μM and 0.86 μM, respectively. This method has also been successfully applied to the detection of real samples. Finally, this study provides a new promising platform for detection of 6-MP and is expected to be used in application of pharmaceutical analysis and biomedicine.
研究领域:
医学诊断
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药物分析
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生物传感
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 8
·期 4
·2021-2032
·
IF 10.733
Yuhan Li,Zongjie Sun,Dongyu Liu,Yiyang Gao,Yuankun Wang,Huaitian Bu,Mingtao Li,Yanfeng Zhang,Guoxin Gao,Shujiang Ding
A solid polymer electrolyte is expected to be useful for safe and high energy density lithium-metal batteries owing to its good flexibility and high degree of safety. The development of a polyethylene oxide (PEO) based solid electrolyte is still restrained by low ionic conductivity and unsatisfactory mechanical strength. Since MnO2 could combine with PEO chains and Li ions could undergo long-range migration on MnO2 nanosheets, MnO2 nanoflakes are chosen as fillers to improve the electrochemical and mechanical properties of a solid polymer electrolyte. A PEO/MnO2 composite solid polymer electrolyte (CSPE) displays a higher lithium ion transference number (0.378), higher ionic conductivity (1.5 times higher at 60 °C) and better tensile strength (2.3 times) than a PEO solid electrolyte. Density functional theory calculations reflect the fact that the binding energy between the PEO/Li complex and MnO2 is small and there is easy desorption of Li from PEO and migration on MnO2 nanosheets, indicating enhanced lithium ion transport in the electrolyte system. A solid-state lithium metal battery using a PEO/MnO2 CSPE delivers higher capacity (143.5 mA h g−1 after 300 cycles) than an electrolyte without fillers (61.2 mA h g−1 after 90 cycles). Soft-package lithium metal batteries with an MnO2 CSPE reveal high safety after cutting, nail and bending tests.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Zheng Zhang,Xiao Du,Qiang Wang,Fengfeng Gao,Tongtong Jin,Xiaogang Hao,Pengfei Ma,Jun Li,Guoqing Guan
A scalable three-dimensional (3D) porous composite electroactive film consisting of λ-MnO 2 , reduced graphene oxide (rGO) and calcium alginate (Ca-alg) was successfully fabricated and employed for the selective extraction of Li + ions with low concentration via an electrochemically switched ion exchange (ESIX) technology. The Li + ion adsorption capacity of the obtained λ-MnO 2 /rGO/Ca-alg composite electroactive film reached as high as 32.7 mg g −1 and more than 90% of its equilibrium adsorption capacity was achieved in 1 h. The λ-MnO 2 /rGO/Ca-alg composite electroactive film displayed evident selectivity towards Li + ions. The separation factors for Li + /Na + and Li + /Mg 2+ reached 1040.57 and 358.96, respectively, while tested in simulated brine. The composite film also showed superior electrochemical stability, and the normalized ion exchange capacity retained at 98.3% of its initial value even after 100 successive cycles. The excellent Li + ion recovery performance of the obtained composite film should be attributed to its low ion transfer resistance owing to the porous network structure and the potential-responsive ion-pumping effect in the ESIX process. In addition, a large-scale of such a composite electroactive film could be effectively fabricated by controlling the spreading area of the mixed solution consisting of λ-MnO 2 , rGO and alginate binder. It is expected that such a scalable 3D porous composite film could be a promising alternative for the recovery of lithium ions from salt lake brine.
研究领域:
材料科学
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环境科学
·
电化学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xiunan Cai,Meifei Chen,Chuanyi Zhong,Jiayue Lu,Yanmei Huang,Yanjuan Zhang,Tao Gan,Huayu Hu,Zuqiang Huang
Crystalline MnO 2 exhibits excellent photo-thermal conversion and adjustability of valence states properties, but the weak near-infrared light absorption, poor charge transportation and utilization limit its environmental applications. Herein, a novel Na-doped amorphous MnO 2 /C-decorated Fe-based geopolymer sphere (A-MnO 2 /C-FeGS) with rich structure vacancies was constructed by ion exchange anchoring strategy and used to degrade tetracycline hydrochloride (TC) in solar light-induced photo-thermal-Fenton process. Manganese residue (MR), an industrial solid waste, was used as the source of Fe and Si. A-MnO 2 /C-FeGS exhibited excellent catalytic performance with TC removal of 98.2% within 30 min, being about 4.5 and 3.3 times faster than crystalline MnO 2 and C-FeGS, respectively. The improved photocatalytic activity was attributed to that rich oxygen vacancies could provide more catalytic active sites and accelerate Fe 3+ /Fe 2+ and Mn 4+ /(Mn 2+ +Mn 3+ ) conversion for more ·OH generation. Moreover, Na-doped amorphous MnO 2 and C decoration synergistically contributed to high photo-thermal conversion rate, which could in-situ heat the catalyst and induce the activation of H 2 O 2 . This promoted the activation of the surface lattice oxygen and accelerated the secondary transition and utilization of the thermal electrons captured by the defect sites. This work provides a novel strategy for the development of highly reactive catalysts and valorization of MR in the field of environmental remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2025
·
IF 1.7
Cheng Lijun,Lei Juan,Ren Xiaoli,Chang Hong,Ju Baihe
In this study, a series of La-α-MnO 2 catalysts with different La doping amounts were prepared by hydrothermal method. It was found that the introduction of La could reduce the crystallinity of α-MnO 2 and increase the specific surface area of the catalyst. Furthermore, La doping can significantly weaken the Mn–O bond, increase the surface Mn 3+ and O ads content, and enhance the oxygen mobility and low-temperature reducibility. The catalytic results indicated that La doping could significantly improve the catalytic oxidation performance of toluene, and 1%La-α-MnO 2 catalyst exhibited the best catalytic activity for toluene oxidation. The toluene conversion rate reaches 90% when the reaction temperature is only 215 °C. In addition, 1%La-α-MnO 2 catalyst presented good stability and repeatability during 50 h durability test under water vapor.
研究领域:
催化化学
·
环境科学
·
材料化学
·
化学工程
✓ 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）