DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Long Chen,Zhao Zhang,Xinyang Zhang,Dewei Wang
Aqueous ammonium-ion (NH 4 + ) is gaining attention as a viable energy storage option due to the use of NH 4 + as the charge carrier, offering advantages of resource abundance, safety, fast diffusion, and a unique storage mechanism. Despite these benefits, the development of storage devices with NH 4 + as the charge carrier are still in the early stages, highlighting the crucial need to explore suitable electrode materials for the production of high-performance devices. In this study, broken porous carbon nanocages (BPCs) serve as the support structure to form a heterostructure with δ-MnO 2 nanosheets (MnO 2 -BPCs) grown onto them, building aqueous NH 4 + asymmetric supercapacitors (ASCs). Both MnO 2 -BPCs and BPCs act as host materials for storing aqueous NH 4 + , exhibiting high specific capacitance and long cycling durability. The assembled NH 4 + ASCs present good capacitive performance, with a large specific capacitance of 223 F g −1 and capacitance preservation of 91.4 % over 10,000 cycles. The high energy density achieved by NH 4 + ASCs is crucial for advanced energy storage thanks to their elevated specific capacitance and broad operating voltage. The balanced capacitive performance of the positive and negative electrodes is essential in enhancing the energy storage capabilities of NH 4 + ASCs. This work provides a straightforward method for creating porous carbon-MnO 2 heterostructures for NH 4 + storage and paves the way for designing aqueous NH 4 + -based sustainable energy storage systems (SESSs) for capacitive energy storage.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2026
·
IF 4.6
Huong Thu Duong,Tai Duc Luong,Duy Tho Pham,Khanh Van Tran,Bien Quang Nguyen,Subramanian Nithiananth,Duc Dung Mai,Vaiyapuri Soundharrajan,Duong Tung Pham,Hien Xuan Vu
A sulfur-doped β-MnO 2 /S, with a ratio of 9: 1, prepared by simple calcination, is applied as a cathode in aqueous Zn-ion pouch cells. Sulfur doping enhances Zn 2+ transport and stabilizes interfacial reactions, enabling durable performance: 111.25 mAh·g −1 after 500 cycles at 1C (1.9 V cutoff) and 158 mAh·g −1 after 250 cycles at 1.3C. GITT and in-situ EIS indicate faster ion transport and lower charge-transfer barriers, while micro-CT reveals uniform Zn deposition and suppressed dendrite formation. This scalable route improves conductivity, kinetics, and interfacial stability, positioning β-MnO 2 /S (9: 1) as a practical cathode for safe, high-performance Zn-ion pouch batteries.
✓ 已验证
DOI
高影响因子
Journal of Pharmaceutical Analysis
·
2026
·
IF 11.2
Jiahui Cai,Zutong Cui,Wenming Liang,Jianming Sun,Zihan Zhang,Feifei Sun,Feng Yang,Zhiwei Liu,Liming Gao,Jidong Wang,Jian Li
The therapeutic efficacy of glucose oxidase (GOx)-mediated starvation therapy and β-Lapachone (LPC)-induced oxidative stress is significantly constrained by tumor hypoxia and elevated antioxidant defenses in the tumor microenvironment. To address these limitations, a multifunctional nanoplatform, LPC/GOx@ZIF-8@MnO 2 , was developed through the integration of LPC and GOx within a zeolitic imidazolate framework-8 (ZIF-8) carrier followed by surface modification with manganese dioxide (MnO 2 ), and its antitumor efficacy and mechanistic basis were systematically evaluated using HeLa cells in vitro and U14 tumor-bearing mouse models in vivo . Comprehensive in vitro and in vivo studies demonstrated significant tumor growth inhibition with excellent biosafety, while mechanistic investigations revealed that this nanocomposite achieves synergistic antitumor effects through four coordinated mechanisms: MnO 2 -catalyzed conversion of endogenous hydrogen peroxide to oxygen alleviates hypoxia while sustaining GOx-mediated glucose depletion; a self-amplifying cascade reaction enhances LPC-induced reactive oxygen species (ROS) generation; photothermally activated upregulation of NAD(P)H:quinone oxidoreductase 1 (NQO1) via the heat shock protein 70 (HSP70)/NQO1 axis enhances LPC efficacy; and depletion of glutathione disrupts cellular antioxidant defenses. Furthermore, it was also revealed that LPC/GOx@ZIF-8@MnO 2 acts on caspase-3, high mobility group box 1 (HMGB1), and matrix metalloproteinase-1 (MMP-1) to coordinate apoptosis induction and metastasis suppression, with molecular docking further clarifying the key binding sites of LPC with these three targets. Collectively, this work presents an innovative strategy to overcome therapeutic limitations imposed by tumor hypoxia, provides molecular-level insights into multimodal synergistic therapy, and offers new ideas for precision tumor therapy.
✓ 已验证
DOI
高影响因子
Colloid and Interface Science Communications
·
2020
·
IF 2.831
Jiaxing Song,Tao Guo,Miao Yao,Jialin Chen,Wen Ding,Xiaonan Zhang,Fengli Bei,Junyi Huang
Graphene oxide (GO) with outstanding mechanical properties and high temperature stability is attractive to many researchers. As a flame retardant, GO also has been widely used in fire resistance applications of polymers. Herein, to explore ignition resistance effect of GO on nanothermite, GO/Al/MnO 2 nanocomposites were prepared. Due to the large specific surface area, GO can completely cover the surface of nanothermite components. Thermal results showed that exothermic thermite reaction occurred in the range of 500 °C to 600 °C while with GO addition, thermite reaction did not happen at all. Originally, combustion phenomenon of Al/MnO 2 nanothermite was intense with bright flame, but GO/Al/MnO 2 nanocomposites cannot be ignited even if the current on heating wires was higher. The physical barrier of GO hinders the direct contact between fuel and oxidizer which prevents the occurrence of self-propagating thermite reaction. This work provides guiding significance to the design of nanothermite flame retardant.
研究领域:
材料科学
·
燃烧化学
✓ 已验证
产品关联
DOI
高影响因子
Energy Storage Materials
·
2019
·
IF 0
Zhuoxin Liu,Donghong Wang,Zijie Tang,Guojin Liang,Qi Yang,Hongfei Li,Longtao Ma,Funian Mo,Chunyi Zhi
Practical application of flexible energy storage devices has not been realized despite the booming of experimental researches. One major concern is their poor mechanical durability, which has seldom been investigated in literatures. On one hand, their flexibility is not good enough to accommodate arbitrary deformations, which was merely demonstrated by statically bending at certain angles. Thus, stability against dynamic mechanical stimuli is highly desired. On the other hand, these devices are not strong enough to endure severe mechanical stimuli including large shear forces and impacts, which greatly limits their practicability. Therefore, device-level toughness to ensure long-term usability is also needed. Here, a mechanically durable Zn-MnO 2 battery is developed based on a dual-crosslinked hydrogel electrolyte without the usage of separator. Due to the effective energy dissipation of the hydrogel, the as-fabricated battery maintains a stable energy output when being dynamically deformed under severe mechanical stimuli. It can be vastly deformed into various shapes without electrochemical performance decay, showing excellent flexibility. It also exhibits super toughness that can endure two days' treading pressure and survive 20 times of random run-over by cars on road. These demonstrations reveal its outstanding mechanical stability and durability, suggesting great potential in truly flexible and wearable applications.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
Small Methods
·
2021
·Vol. 5
·期 9
·2100491
·
IF 14.188
Wending Pan,Jianjun Mao,Yifei Wang,Xiaolong Zhao,Kee Wah Leong,Shijing Luo,Yue Chen,Dennis Y. C. Leung
Aqueous Al–ion battery (AAIB) is regarded as a promising candidate for large-scale energy storage systems due to its high capacity, high safety, and low cost, with MnO 2 proved to be a high-performance cathode. However, the potential commercial application of this type of battery is plagued by the frequent structural collapse of MnO 2 . Herein, an in situ, electrochemically reformed, urchin-like Al x MnO 2 cathode is developed for water-in-salt electrolyte-based AAIBs. Benefiting from its unique α-MnO 2 coated Mn 2 AlO 4 structure, a high Al ion storage capacity is achieved together with a high discharge voltage plateau of 1.9 V by reversible MnO 2 electrolysis. Consequently, the battery exhibits a high specific capacity of 285 mAh g –1 and a high energy density of 370 Wh kg –1 at a high current density of 500 mA g –1 . Improved stability with record capacity retention is also obtained at an ultrahigh current density of 5 A g –1 after 500 cycles. Such a high-capacity and high-stability Al x MnO 2 cathode would pave the way for in situ electrochemical transformation of cathode design and thus boost the practical application of AAIBs.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Xue Wang,Hanping Zhang,Quanguo Zhai,Yucheng Jiang,Mancheng Hu,Shuni Li
In this work, the high-quality protonated Ni-doped MnO 2 (H–Ni–MnO 2 NRs) nanorods with a mean diameter of about 15 nm were synthesized by a hydrothermal method , which was successfully applied to Cs + adsorption under electrochemical process. The as-prepared H–Ni–MnO 2 NRs showed high selectivity to Cs + adsorption in both acidic and neutral media. In particular, the amount of Cs + adsorption increased with increasing solution pH. The adsorption capacity of H–Ni–MnO 2 NRs for Cs + could reach up to 11.5 mmol·g −1 at pH 7, much higher than previous reports (0.06–6 mmol·g −1 ). The high adsorption of H–Ni–MnO 2 NRs ability could be attributed to their especial morphology, Ni doping, and Mn(III) amount enhancement induced by electrochemical reduction .
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Qing Sun,Ziyang Guo,Tie Shu,Yongfei Li,Kailin Li,Yuxin Zhang,Liang Li,Jiaoyi Ning,Ke Xin Yao
The traditional methods for creating oxygen vacancies in materials present several challenges and limitations, such as high preparation temperatures, limited oxygen vacancy generation, and morphological destruction, which hinder the application of transition metal oxides in the field of zinc–air batteries (ZABs). In order to address these limitations, we have introduced a pioneering lithium reduction strategy for generating oxygen vacancies in δ-MnO2@MXene composite materials. This strategy stands out for its simplicity of implementation, applicability at room temperature, and preservation of the material’s structural integrity. This research demonstrates that aqueous Ov-MnO2@MXene-5, with introduced oxygen vacancies, exhibits an outstanding oxygen reduction reaction (ORR) activity with an ORR half-wave potential reaching 0.787 V. DFT calculations have demonstrated that the enhanced activity could be attributed to adjustments in the electronic structure and alterations in adsorption bond lengths. These adjustments result from the introduction of oxygen vacancies, which in turn promote electron transport and catalytic activity. In the context of zinc–air batteries, cells with Ov-MnO2@MXene-5 as the air cathode exhibit outstanding performance, featuring a significantly improved maximum power density (198.3 mW cm–2) and long-term cycling stability. Through the innovative strategy of introducing oxygen vacancies, this study has successfully enhanced the electrochemical catalytic performance of MnO2, overcoming the limitations associated with traditional methods for creating oxygen vacancies. Consequently, this research opens up new avenues and directions for nonprecious metal catalyst application in ZABs.
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Jianghua Wu,Yue Guo,Waseem Raza,Hajera Gul,Geng Luo,Yangbin Ding,Ying Li,Ying Lv,Jian Yu,Lasharl Najeeb Ur Rehman,Jie Zhao
Manganese dioxide (MnO 2 ) is a promising supercapacitive material due to the advantages of low cost, natural abundance and friendly environment. Nevertheless, it generally presents an unsatisfactory supercapacitive performance due to the poor utilization rate in the charge/discharge process and the sluggish charge (electrons/ions) transfer kinetics. Constructing a 3D MnO 2 network is a promising way to solve the above problems, but usually suffers from a prolonged reaction time or a high-heating source that makes them unfavorable for practical applications. Here, we developed a one-pot, fast and cost-effective method to assemble 3D MnO 2 network electrode materials within 10 min. The MnO 2 -network materials present a high utilization rate and a fast charge transfer capability. As an aqueous supercapacitor electrode, it exhibited a high specific capacitance of 382 F g −1 at 1 A g −1 and ranked among the intrinsic MnO 2 materials at the top level. The corresponding asymmetric supercapacitor coupled with activated carbon delivered a high energy density of 44 Wh kg −1 at a power density of 277 W kg −1 and maintains 91.2 % capacitance retention after 10,000 cycles at 10 A g −1 . This work paves the way for simple, environmental-friendly, and rapid methods to gain the high-performance MnO 2 electrode materials for supercapacitors.
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
Catalysts
·
2023
·Vol. 13
·期 4
·663
·
IF 3.9
Xu Wu,Heqin Guo,Litao Jia,Yong Xiao,Bo Hou,Debao Li
The base-free oxidation of furfural by non-noble metal systems has been challenging. Although MnO2emerges as a potential catalyst application in base-free conditions, its catalytic efficiency still needs to be improved. The crystalline form of MnO2is an important factor affecting the oxidation ability of furfural. For this reason, four crystalline forms of MnO2(α, β, γ, and δ-MnO2) were selected. Their oxidation performance and surface functional groups were analyzed and compared in detail. Only δ-MnO2exhibited excellent activity, achieving 99.04% furfural conversion and 100% Propo.FA(Only furoic acid was detected by HPLC in the product) under base-free conditions, while the furfural conversion of α, β, and γ-MnO2was below 10%. Characterization by XPS, IR, O2-TPD and other means revealed that δ-MnO2has the most abundant active oxygen species and surface hydroxyl groups, which are responsible for the best performance of δ-MnO2. This work achieves the green and efficient oxidation of furfural to furoic acid over non-noble metal catalysts.Keywords:base-free;MnO2;crystal type;furfural oxidation to furoic acid
研究领域:
催化化学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2016
·
IF 4.836
Xueqin Wang,Lvye Dou,Liu Yang,Jianyong Yu,Bin Ding
Constructing nanostructured catalyst-embedded ceramic fibrous membranes would facilitate the remediation or preliminary treatment of dyeing wastewater, however, most of such membranes are brittle with low deformation resistance, thus, restricting their widely applications. Herein, the flexible and hierarchical nanostructured MnO 2 -immobilized SiO 2 nanofibrous membranes (MnO 2 @SiO 2 NFM) were fabricated by combining the electrospinning technique with hydrothermal method. The morphologies of membranes could be regulated from nanowires and nanoflower to mace-like structure via varying concentration of reactants. The resultant MnO 2 @SiO 2 NFM could cooperate with hydrogen peroxide to form a Fenton-like reagent for the degradation of methylene blue (MB). The resultant membrane exhibited prominent catalytic performance towards MB, including high degradation degree of 95% within 40 min, fast degradation rate of 0.0865 min −1 , and excellent reusability in 5 cycles. Moreover, the membranes could be used in a wide pH range of 0 to 14 and the degradation degree reached 76% during dynamic filtration process with a flux of 490,000 L m −2 h −1 . The successful fabricating of such membrane with extraordinary catalytic performance would provide a platform for preparing high-performance catalysts for remediation of dyeing wastewater.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2015
·
IF 6.217
Chao Pan,Haiteng Gu,Li Dong
We introduce a facile method to construct new ternary hierarchical nanocomposites by combining MnO 2 coated one dimensional (1D) conducting polyaniline (PANI) nanowires with 2D graphene sheets (GNs). The hierarchical nanocomposite structures of PANI@MnO 2 /GNs (PMGNs) are further proved by X-ray diffraction (XRD), FT-IR, field emission scanning electron microscopy (FESEM), transmission electron microscope (TEM), thermogravimetric analysis (TGA), and X-ray photoelectron spectroscopy (XPS). The electrochemical characteristics of the electrodes made of the hierarchical structured PMGNs materials are determined by the CV and galvanostatic measurements. These electrochemical tests indicate that electrodes made of the nanostructured PMGNs exhibit an improved reversible capacitance of 695 F g −1 after 1000 cycles at a high current density of 4 A g −1 . The ternary composites possess higher electrochemical capacitance than each individual component as supercapacitor electrode materials . Such intriguing electrochemical performance is mainly attributed to the synergistic effects of MnO 2 , PANI and graphene. The hierarchical ternary nanocomposites show excellent electrochemical properties for energy storage applications , which evidence their potential application as supercapacitors.
研究领域:
材料科学
·
电化学
✓ 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）