Journal of Materials Chemistry C
·
2026
·
IF 5.1
Jiaoyuan Lu,Xiaojun Tang,Huiting Bi
Compared with α-, β- and γ-MnO2, δ-MnO2 possesses a large interlayer spacing, abundant active sites and high compatibility with aqueous electrolytes. Due to these advantages, δ-MnO2 is considered a potential candidate for efficient aqueous zinc-ion battery and high-safety energy storage systems. Nevertheless, its structural instability and suboptimal electrical conductivity hinder it from being an ideal electrode material. In this study, a 3D conductive framework was fabricated by uniformly integrating δ-MnO2 and ultrathin rGO nanosheets through a simple freeze-drying process. The introduction of rGO endows the δ-MnO2/rGO composites with a unique “conductive network–dispersion support” structure. The as-constructed 3D architecture effectively overcomes the intrinsically low conductivity of δ-MnO2 and decreases the charge transfer resistance. Meanwhile, the porous framework enlarges the electrode–electrolyte contact area, accommodates the volume variation and lattice distortion during Zn2+ insertion/extraction, and thus maintains structural integrity upon long-term cycling. Consequently, the δ-MnO2/rGO electrode exhibits excellent cycling stability, with a maximum specific discharge capacity of 127.6 mAh g−1 at 1 A g−1, which remains at 82.1 mAh g−1 after 600 cycles. The specific capacity is obviously better than that of δ-MnO2 (63.2 mAh g−1 after 450 cycles).
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Liwei Yang,Xinyuan Tian,Zhuoyue Liu,Hui Yu,Zixin Peng,Chao Hai,Xing Xu,Chuanliang Zhao
MnO 2 has a large potential for defluoridation, however, the influences of its crystal forms on the performance and mechanism of defluoridation are unknown. The research systematically investigated the defluoridation performance and mechanism of a total of eight materials with different crystal forms of MnO 2 (α, β, γ, δ) before and after lanthanum modification, separately. It was indicated that the largest Langmuir adsorption of α-MnO 2 and La-γ-MnO 2 for fluoride achieved 5.04 mg/g and 42.39 mg/g, correspondingly. The surface hydroxyl group and lanthanum loading of the material proved to be the major contributors to defluoridation. For the adsorption performance of eight materials on fluoride, pH was a significant influencing factor, with the highest adsorption performance at pH 5 ∼ 6. The eight materials showed consistent selectivity for fluoride adsorption in the existence of different anions, with the order of influence on the removal efficiency: CO 3 2– > NO 3 – > SO 4 2 – > Cl – . The studies of FTIR, XPS, and variation of solution pH further illustrated that the adsorption mechanism of the eight materials on fluoride was the ion-exchange interaction and the complexation reaction. In addition, the effect of crystal forms on the adsorption of fluoride ions was further elaborated by DFT analysis. Finally, this study provided an in-depth discussion of the parameters of the dynamic process as well as the nature of the penetration curves by applying the Thomas, Clark, and BDST models.
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
Science of Advanced Materials
·
2022
·Vol. 14
·期 5
·927-933
·
IF 1.067
Zhou Shuwen,Wang Qing,Chen Jun,Shen Yue,Liu Li,Wang Cheng
Manganese dioxide (MnO2) is one of the commonly applied inorganic material which is gaining increasing attentions in recent years. However, preparation and optimization of MnO2 nanoparticles have rarely been studied by previous studies, making the mechanisms responsible
for preparation of MnO2 remaining largely unknown. Here in this study, we synthesized MnO2 through reduction of potassium permanganate (KMnO4) using different reductants, including protein, polymers and small molecule organic acids. It was suggested that, stable
MnO2 nanoparticles can only be obtained in balanced synthesis/stabilization process which requires the reductant to have proper reducibility and stabilization ability at the right charge ratios. Our results concluded that, among these materials, polyvinylpyrrolidone (PVP) K30 showed
the best performance at the charge ratio of 8/3 (w/w, PVP K30 to KMnO4, under given reaction conditions, which resulted in nanoparticles (hydrodynamic size: 79.72±31.53) with high stability and well dispersity, which was then selected as the optimal formulation.
研究领域:
材料科学
·
化学工程
·
纳米技术
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2023
·
IF 6.2
Huan Yao,Wenju Dong,Xu Ji,Shuang Cheng
In acidic environment, electrolytic Zn//MnO 2 batteries possess high potential to reach high energy density on the promise of high safety, low cost, and high power density. However, several serious challenges still need to be overcome, mainly including suitable current collector that can be stable in strong acidic and oxidizing environment, optimal cathode that can promote massive and uniform deposition of the MnO 2 , and Zn-plating efficiency and corrosion resistance improvement. Herein, a free-standing and binder-free film composed of graphene powder (GP) and MnSO 4 (GP/MS-F) was developed and used as initial cathode frame. The film with a GP: MnSO 4 mass ratio of 2:3 and a total areal mass of 13 mg cm −2 exhibits good conductivity and considerable flexibility without the using of any other additives. Matched with C coated ZnO (ZnO@C) modified anode frame and Carboxy Methyl Cellulose Sodium gelled acidic electrolyte, the film can deliver a high areal capacity of 1.4 mAh cm −2 , corresponding to a specific capacity of 184 mAh g −1 based on the total mass of initial GP and deposited MnO 2 (∼7.6 mg). At 5 mA cm −2 , a high Coulombic efficiency of 92 % can be achieved and maintained for 2,100 cycles. At 30 mA cm −2 , the cell can work well for 8,000 cycles. Meanwhile, discharge voltage of the cell can reach 1.9 V, exhibiting high practical application prospect.
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Energy Research
·
2020
·
IF 2.746
Zhou Weijun,Wang Anran,Huang Aixiang,Chen Minfeng,Tian Qinghua,Chen Jizhang,Xu Xinwu
With the advantages of intrinsic safety, low price, high output potential, and acceptable energy density, aqueous rechargeable Zn–MnO2 batteries are gradually emerging as promising energy storage devices in recent years. Unfortunately, the structural instability and poor electrical conductivity of manganese dioxides still hinder their further applications. To tackle these issues, we demonstrate a high-performance cathode material for Zn–MnO2 batteries by hybridizing lignin-derived porous carbon with δ-MnO2 (denoted as LPC/δ-MnO2). Benefiting from the high electrical conductivity of porous carbon, the LPC/δ-MnO2 cathode material can offer high discharge capacity of 332.3 mAh g–1 at 0.2 A g–1 and excellent high-rate capability (196.1 mAh g–1 at 5 A g–1). Meanwhile, the assembled Zn–MnO2 battery displays good long-term cycling stability (82% capacity retention after 1000 cycles). Such superior performances are attributed to the synergetic effect of nanostructured δ-MnO2 and porous carbon scaffold, which is in favor of rapid Zn2+ ion diffusion and large contribution ratio of pseudocapacitive Zn2+ ion intercalation. The results of this study show great prospects of hybridizing biomass-derived carbon framework with electrochemically active materials toward advanced energy storage materials.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2024
·
IF 13
Gang Zhao,Huanchi Chen,Bingzhe Jia,Shanshan Bai,Xinrui Qiang,Xinming Wu
All-solid-state supercapacitors are known for their safety, stability, and excellent cycling performance. However, their limited voltage window results in lower energy density, restricting their widespread application in practical scenarios. Therefore, in this work, CC/MoO 3 @Ti 3 C 2 T x negative electrode and Mo 1 Al 1 -MnO 2 /CC positive electrode materials are synthesized and prepared by electrochemical deposition co-coating and one-step hydrothermal methods, respectively, and assembled into an asymmetric supercapacitor (ASC) device based on the two electrode materials. The study reveals that the surface capacitances of the positive and negative electrodes are 1685.5 mF cm −2 and 1134.98 mF cm −2 correspondingly, with potential windows of both as high as 1.1 V. Surprisingly, the potential window of the all-solid-state supercapacitor assembled based on the two electrodes reaches 2.2 V, and the energy density reaches 0.44 m W h cm −2 , which is much higher than the performance indicators based on similar electrodes. The resulting excellent performance parameters are mainly attributed to the efficient synergy between the pseudo-capacitance effect of the MoO 3 film and the high electrical conductivity of the Ti 3 C 2 T x sheets, as well as the great improvement of the intrinsic electron mobility and ion diffusion channel stability of MnO 2 by Mo and Al bimetallic doping.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2026
·
IF 10.6
Jie Chen,Peizeng Yang,Kai Wu,Yuefei Ji,Xuezhu Zhu,Jing Chen,Junhe Lu
The cryosphere plays a critical role in global biogeochemical cycles, however, the kinetic behavior and environmental fate of pollutants in ice remain insufficiently understood. In this study, we investigated for the first time the effect of freezing and syringic acid (SYA) on the transformation of sulfamethoxazole (SMX) mediated by manganese dioxide (MnO 2 ) under slightly acidic conditions. Freezing significantly accelerated SMX removal, reached 23.1% within 4 h in the absence of SYA, whereas this removal was negligible in aqueous solution. The presence of SYA further promoted the transformation of SMX, achieving 81.3% removal in ice compared to 46.5% in aqueous solution. We proposed that this enhanced transformation was driven by synergistic effects of solute aggregation and localized pH drop between ice crystals, arising from the freeze-concentration effect. These processes collectively elevated the redox activity of MnO 2 , and significantly promoted the rate of SMX transformation. Under this condition, SYA was first oxidized by MnO 2 to quinone, which subsequently underwent nucleophilic addition with SMX to form coupling products. These findings underscore that natural ice matrices serve as a potential medium for organic matter transformation, thereby exerting a profound influence on the environmental fate of sulfonamide antibiotics in polar and cold regions.
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Honghao Zhang,Jun Wei,Yu Yan,Qianjin Guo,Liqiang Xie,Zhengchun Yang,Jie He,Wen Qi,Zongsheng Cao,Xinhao Zhao,Peng Pan,Huayi Li,Kailiang Zhang,Jinshi Zhao,Xuan Li,Ping Zhang,Kwok Wei Shah
In order to improve the production rate of MnO 2 as the excellent supercapacitor materials and enhance the performance of MnO 2 based pseudocapacitor , an innovative mechanical method of ultrasonic assisted shear exfoliation is developed to prepare MnO 2 nanocrystalline in large quantities, and then the MoS 2 composites are deposited by simple magnetron sputtering to form inner heterojunction structure to improve the overall supercapacitor performance. The electrochemical performances of the electrodes fabricated by commodity MnO 2 (c-MnO 2 ), sheared MnO 2 (s-MnO 2 ) and s-MnO 2 /MoS 2 are studied respectively. The results demonstrate that as-prepared s-MnO 2 presents better supercapacitor performance compared with c-MnO 2 due to the increase of specific surface area after the shearing process. In addition, the s-MnO 2 /MoS 2 inner heterostructure shows the best electrochemical reversibility , the highest rate capacity, the most excellent specific capacitance (~224 mF cm −2 ) and the highest conductivity among three working electrode materials because of its high specific surface area and good conductivity. The symmetrical all-solid-state supercapacitor based on s-MnO 2 /MoS 2 is fabricated, its specific capacitance can still maintain 90% after 3000 cycles of charging/discharging process, and this all-solid-state supercapacitor can power a group of 43 light-emitting diodes (LEDs). In addition, the packaged supercapacitor device can gain excellent capacitance performance during bending.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Small Methods
·
2022
·Vol. 6
·期 12
·2201142
·
IF 15.367
Ce Qiu,Jia Liu,Hanghui Liu,Xiaohui Zhu,Liang Xue,Shuang Li,Mingzhu Ni,Yang Zhao,Tong Wang,Serguei V. Savilov,Sergey M. Aldoshin,Hui Xia
Although birnessite-type manganese dioxide (δ-MnO 2 ) with a large interlayer spacing (≈7 Å) is a promising cathode candidate for aqueous Zn/MnO 2 batteries, the poor structural stability associated with Zn 2+ intercalation/deintercalation limits its further practical application. Herein, δ-MnO 2 ultrathin nanosheets are coupled with reduced graphene oxide (rGO) via van der Waals (vdW) self-assembly in a vacuum freeze-drying process. It is interesting to find that the presence of vdW interaction between δ-MnO 2 and rGO can effectively suppress the layered-to-spinel phase transition in δ-MnO 2 during cycling. As a result, the coupled δ-MnO 2 /rGO hybrid cathode with a sandwich-like heterostructure exhibits remarkable cycle performance with 80.1% capacity retained after 3000 cycles at 2.0 A g −1 . The first principle calculations demonstrate that the strong interfacial interaction between δ-MnO 2 and rGO results in improved electron transfer and strengthened layered structure for δ-MnO 2 . This work establishes a viable strategy to mitigate the adverse layered-to-spinel phase transition in layered manganese oxide in aqueous energy storage systems.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Current Analytical Chemistry
·
2020
·Vol. 16
·期 6
·744-752
·
IF 1.365
Luo Kuan,Jiang Xinyu
Background: Diabetes Mellitus (DM) is a major public metabolic disease that influences 366 million people in the world in 2011, and this number is predicted to rise to 552 million in 2030. DM is clinically diagnosed by a fasting blood glucose that is equal or greater than 7 mM. Therefore,
the development of effective glucose biosensor has attracted extensive attention worldwide. Fluorescence- based strategies have sparked tremendous interest due to their rapid response, facile operation, and excellent sensitivity. Many fluorescent compounds have been employed for precise analysis
of glucose, including quantum dots, noble metal nanoclusters, up-converting nanoparticles, organic dyes, and composite fluorescent microspheres. Silicon dot as promising quantum dots materials have received extensive attention, owing to their distinct advantages such as biocompatibility, low
toxicity and high photostability. Methods: MnO2 nanosheets on the Si nanoparticles (NPs) surface serve as a quencher. Si NPs fluorescence can make a recovery by the addition of H2O2, which can reduce MnO2 to Mn2+, and the glucose can thus be monitored based on the enzymatic conversion
of glucose by glucose oxidase to generate H2O2. Therefore, the glucose concentration can be derived by recording the fluorescence recovery spectra of the Si NPs. Results: This probe enabled selective detection of glucose with a linear range of 1-100 μg/mL and a limit of detection of
0.98 μg/mL. Compared with the commercial glucometer, this method showed favorable results and convincing reliability. Conclusion: We have developed a novel method based on MnO2 -nanosheet-modified Si NPs for rapid monitoring of blood glucose levels. By combining the highly sensitive
H2O2/MnO2 reaction with the excellent photostability of Si NPs, a highly sensitive, selective, and cost-efficient sensing approach for glucose detection has been designed and applied to monitor glucose levels in human serum with satisfactory results.
研究领域:
生物医学工程
·
分析化学
·
糖尿病研究
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2025
·
IF 4.1
Hu Fu,Weigang Zhu,Wenhua Xu,Zhongwei Zhao
Lithium-ion detection is necessary for extraction of lithium. Electrochemical sensors based on spinel LiMn 2 O 4 /λ-MnO 2 are expected to enable low-cost detection of lithium ions. Many studies demonstrate preferential intercalation of lithium ions, but little research has been done on how the differences in intercalation between lithium and other ions arise. Here, the differences in intercalation were identified by electrochemical impedance spectroscopy. Lithium ions were preferentially intercalated into λ-MnO 2 because of low charge transfer impedance. The apparent diffusion coefficient of sodium or potassium ions was one order of magnitude lower than that of lithium ions, while that of magnesium or calcium ions was two orders of magnitude lower. Therefore, insignificant intercalation of sodium, magnesium, potassium, and calcium ions slowed down diffusion of lithium ions through the channel and obstructed lithium-ion intercalation. The concentration of lithium ions was detected in brine of Baqiancuo Salt Lake by stripping voltammetry using λ-MnO 2 and an average recovery of 95.0 % was achieved. This study gives insights into ion intercalation of LiMn 2 O 4 in brine, which favors improvement of lithium-ion sensor based on LiMn 2 O 4 . In addition, the investigation facilitates understanding of the selectivity of similar materials (e.g., LiFePO 4 and Prussian blue analogous) in intercalation process.
研究领域:
材料科学
·
电化学传感器
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL ENGINEERING
·
2025
·Vol. 151
·期 8
·04025043
·
IF 1.6
Jie Zhang,Mengchen Zong,Ben Dong,Sijie Ge,Shilong He
Quinoline, as one of the typical toxic and refractory organic pollutants in coal chemical industry wastewater, poses a significant threat to human health and environmental quality. In this study, MnCexOy and MnFexOy catalysts were successfully synthesized by doping Ce3+ and Fe2+ into α-MnO2 at a molar ratio of 1∶10 and were applied to the process of catalytic ozonation for the degradation of quinoline. Additionally, a variety of characterization techniques were employed to elucidate the characteristics of the catalysts, including scanning electron microscopy, X-ray diffraction, Brunauer–Emmett–Teller (BET) analysis, X-ray photoelectron spectroscopy, H2-TPR, NH3-TPD. The results show that, in the catalytic ozonation system for quinoline removal, MnCexOy demonstrates excellent quinoline removal efficiency of 87.45%, which is higher than that of MnFexOy (78.83%) and unmodified α-MnO2 (62.67%). By introducing the surface hydroxyl masking agent HPO42−, the significant role of surface hydroxyl groups and oxygen vacancies in the catalytic degradation of quinoline by MnCexOy was further demonstrated. Exploring the surface characteristics of catalysts is beneficial for continued understanding of the active centers of catalysts. Research results will be helpful to the deep treatment and reuse of tailing water of coking wastewater.
研究领域:
环境科学
·
催化材料科学
✓ 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）