ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Pengyi Tang,Lijuan Han,Li Zhang
A facile and low-cost method is presented to synthesize graphite/PEDOT/MnO2 composites with controlled network structures on commercial supercapacitor separator (CSS) membranes for high-performance supercapacitors, in which pencil lead and a cellulose-based commercial supercapacitor separator membrane were applied as the graphite source and the flexible substrate, respectively. The dependence of PEDOT and MnO2 loading on the structural formation, the electrochemical performance of the hybrid electrode, and the formation mechanism of MnO2 nanowires are systematically investigated. The optimized electrode possesses a high areal capacitance of 316.4 mF/cm2 at a scan rate of 10 mV/s and specific capacitance of 195.7 F/g at 0.5 A/g. The asymmetric supercapacitor device assembled using optimized CSS/Graphite/PEDOT/MnO2 electrode and activated carbon electrode exhibits a high energy density of 31.4 Wh/kg at a power density of 90 W/kg and maintains 1 Wh/kg at 4500 W/kg. After 2000 cycles, the device retains 81.1% of initial specific capacitance, and can drive a mini DC-motor for ca. 10 s. The enhanced capability of the CSS-based graphite/PEDOT/MnO2 network electrode has high potential for low-cost, high-performance, and flexible supercapacitors.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Xinyang Zhang,Yingjun Wei,Xiaoyu Yang,Chunping Hou,Yuhong Chen,Dewei Wang
The development of high-performance magnesium-ion-based hybrid capacitors and asymmetric supercapacitors is hindered by the limitations of cathode materials, particularly in terms of specific surface area and the availability of active sites. This study presents a phase transition approach to overcome these challenges by enhancing the magnesium-ion (Mg 2+ ) storage capacity of MnO 2 through a general, single-step method that is applicable to various MnO 2 phases. The method involves low-temperature treatment, which engenders a considerable increase in the specific surface area and the transformation of the material's morphology into a three-dimensional hierarchical structure. This structural change, along with the introduction of oxygen vacancies and fluoride anion doping, results in a noticeable improvement in the specific capacitance of the resulting material (denoted as MnO 2-x F y ). Utilizing K 1.33 Mn 8 O 16 as a case study, the specific surface area was significantly enhanced from an initial 39.6 to an impressive 255.5 m 2 g −1 following the treatment process, and the specific capacitance enhanced from 101.8 to 491.5 F g −1 at 0.5 A g −1 . Similar enhancements were achieved for other MnO 2 phases, including alpha-MnO 2 , Na 0.55 MnO 2 , and beta-MnO 2 . Furthermore, the as-obtained MnO 2-x F y materials were then used as the cathode to construct hybrid capacitors and asymmetric supercapacitors, which exhibited high specific capacitance and good cycling stability when paired with 3,4,9,10-perylenetetracarboxylic diimide (PTCDI) or activated carbon anodes. This work highlights a universal strategy for cathode material design that integrates structural and defect engineering, providing a foundation for the development of advanced magnesium-ion-based hybrid capacitors and asymmetric supercapacitors.
研究领域:
材料科学
·
能源存储
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS TECHNOLOGY
·
2021
·
IF 3.846
Liangshuo Li,Shuhua Pang,Xin Fan,Yanfang Wang,Hua Cheng,Dong Fang,Lin Qin,Ming Deng,Zhouguang Lu
Aqueous supercapacitor shows a narrow operating voltage range because of the limitation of the water electrolysis, resulting in low energy density. In this work, a nanoporous MnO2 entangled hierarchical porous carbon skeleton (simplified to MHPC) has been successfully prepared. Aqueous asymmetric supercapacitor has been assembled by employing the MHPC as a positive electrode, a hierarchical porous carbon skeleton (HPC) as a negative electrode, and a neutral Na2SO4 aqueous solution as electrolyte. The assembled asymmetric supercapacitor can be stably charged in an aqueous medium in a wide voltage range of 0–2.5 V and delivers a maximum energy density of 20.8Wh/kg at a power density of 0.25 kW/kg and 25 kW/kg at an energy density of 11.1 Wh/kg in a 1 M Na2SO4 aqueous solution. This strategy provides a new idea for developing high-energy supercapacitor.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Xinxing Zhou,Yunzhi Xu,Xiaojie Mei,Ningjie Du,Rongmao Jv,Zhaoxia Hu,Shouwen Chen
An efficient and inexpensive catalyst for oxygen reduction reaction (ORR), polyaniline (PANI) and β-MnO 2 nanocomposites (PANI/β-MnO 2 ), was developed for air-cathode microbial fuel cells (MFCs). The PANI/β-MnO 2 , β-MnO 2 , PANI and β-MnO 2 mixture modified graphite felt electrodes were fabricated as air-cathodes in double-chambered MFCs and their cell performances were compared. At a dosage of 6 mg cm −2 , the maximum power densities of MFCs with PANI/β-MnO 2 , β-MnO 2 , PANI and β-MnO 2 mixture cathodes reached 248, 183 and 204 mW m −2 , respectively, while the cathode resistances were 38.4, 45.5 and 42.3 Ω, respectively, according to impedance analysis. Weak interaction existed between the rod-like β-MnO 2 and surficial growth granular PANI, this together with the larger specific surface area and PANI electric conducting nature enhanced the electrochemical activity for ORR and improved the power generation. The PANI/β-MnO 2 nanocomposites are a promising cathode catalyst for practical application of MFCs.
研究领域:
环境科学
·
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yongping Lu,Wenjin Ye,Weiqi Kang,Shuaibing Wang,Zhongqiang Zhu,Xingyu Chen,Jianshu Li
Wound healing, a global medical issue, poses a substantial financial burden. Therefore, developing low-cost and highly efficacious wound-healing materials is essential. In this study, we prepared keratin–hyperbranched polymer hydrogel-M (KHBP-M), a multifunctional composite gel, by mixing reduced keratin containing free sulfhydryl groups extracted from human hair waste, hyperbranched polymer (HBP) with double bonds at the end, and MnO2 nanoparticles prepared using the biological template method. Keratin has intrinsic wound-healing properties, and MnO2 is a wound-healing material with both photothermal antibacterial and reactive oxygen species (ROS)–scavenging abilities. KHBP-M showed antibacterial effects against both Gram-positive (Staphylococcus aureus) and Gram-negative (Escherichia coli) bacteria. When exposed to irradiation (808 nm), the killing ratio for S. aureus reached 99.99%, which is especially suitable for wound environments. A similar trend was noted for E. coli. The composite hydrogel also showed excellent ROS-scavenging ability and could resist oxidative stress in L929 cells. Furthermore, in an animal model of infected wounds, the KHBP-M hydrogel treated with near-infrared light had the fastest wound-healing rate, reaching 82.98% on day 15. Our study provides a promising wound-healing material, with simple preparation methods, easy access to sources, and low cost involved.
研究领域:
生物材料学
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医学工程
·
药理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DIAMOND AND RELATED MATERIALS
·
2022
·
IF 3.806
Jiwei Xie,Guijing Liu,Jia Sun,Rundou Zheng,Wenwen Zhao,Tongtong Chu,He Lin,Yanbin Xu,Shanmin Gao,Zhuyin Sui
MnO 2 as the cathode material of Zinc-ion batteries (ZIBs) has attracted great attention. In order to further improve the performance of ZIBs, MnO 2 hollow nanorobs and carbon nanotubes (CNTs) are compounded to obtain α-MnO 2 /CNTs nanocomposites in which robs and tubes are entangled with each other and present the cross-linked reticular structure. This structure of α-MnO 2 /CNTs electrode is obtained through hydrothermal strategy and provides large space for the volume variation of MnO 2 during the charge and discharge process. The α-MnO 2 /CNTs composite displays an excellent initial discharge capacity of 302 mAh·g −1 at 100 mA·g −1 , and keeps 116 mAh·g −1 at 2000 mA·g −1 (78.4% retention after 2000 cycles). This composite provides a new way for the further application of ZIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Lili Ren,Dongyang Zhou,Jingjing Wang,Tao Zhang,Yinxian Peng,Guoguang Chen
The selection and preparation of materials is very important for the green treatment of wastewater. In our study, MnO 2 nanosheets were in-situ grown on biomass carbon microspheres (BCM) to format flower-like MnO 2 @carbon microspheres (CMn) adsorption composites. Amoxicillin (AMX) was adopted as model pollutant, and its adsorption was investigated as function of the contact time, AMX concentration, adsorbent dosage, and pH. The highest adsorption capacity of CMn was 16.094 mg/g in neutral medium. The adsorption isotherms were fitted using the Langmuir model. The kinetics of AMX adsorption was determined to follow the pseudo-first-order model. Recycle experiments indicated that CMn exhibited high adsorption efficiency (>80%) after four cycles. Therefore, the as-prepared CMn can be a promising material for removing pollutants form wastewater in the future.
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
MATERIALS RESEARCH BULLETIN
·
2022
·
IF 5.6
Xing Li,Jun Li,Xixian Yang,Lisheng Deng,Tao Zeng,Hongyu Huang
A porous MnO 2 /CeO 2 composite catalyst was prepared via the template method for the catalytic decomposition of formaldehyde (HCHO). The physical and chemical properties of the catalysts were intensively characterized via X-ray diffraction, transmission electron microscopy, Brunauer-Emmett-Teller analysis, temperature programmed reduction system and X-ray photoelectron spectroscopy. The catalytic activity and stability for HCHO oxidation were measured via a fixed bed reactor, and the effects of physical and chemical properties of the catalysts on their catalytic performance were investigated. The results showed that the porous MnO 2 /CeO 2 catalyst had abundant 3D pore structures, a large specific surface area, an amorphous structure, and an abundance of lattice oxygen species. Thus, the MnO 2 /CeO 2 catalyst had high catalytic activity and stability for HCHO decomposition. This catalyst completely decomposed HCHO at 90 °C and maintained a 99% HCHO conversion rate over 72 h. The highly porous structure reduced the diffusion resistance in the reaction process and improved the efficiency of catalytic decomposition of HCHO. Doping with CeO 2 improved the low temperature oxidation activity and catalytic stability of the porous MnO 2 /CeO 2 catalyst. The porous MnO 2 /CeO 2 composite was an effective agent for the removal of harmful HCHO from the air.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Xiufeng Wang,Wenhui Ai,Ge Chen,Yao Jin,Jiayao Chen,Fang Wang,Ting Zhou,Guodong Zhang,Zhiqing Zhang
A novel Mo-MnO 2 nanoflowers (NFs) with oxidase-like (OXD-like) activity was performed by microwave-assisted hydrothermal synthesis, and the doping of Mo resulted in enhanced enzyme-like activity and stronger affinity for the chromogenic substrate 3,3′,5,5′-Tetramethylbenzidine (TMB) than single MnO 2 by the same synthesis method. In the presence of oxygen, Mo-MnO 2 NFs oxidized the colorless TMB to blue oxTMB, and the addition of isoniazid and ascorbic acid inhibited the color development reaction. Besides, it was further investigated that the inhibitory mechanism of INH and AA on the color development reaction of Mo-MnO 2 -TMB system, mainly due to the electrostatic interaction. The absorbance change of oxTMB at 652 nm could be used to quantitative detect isoniazid (INH) and ascorbic acid (AA). The linear ranges of colorimetric detection were 1–40 μM for INH and 1–30 μM for AA, and the limits of detection (LOD) were 0.436 μM for INH and 0.579 μM for AA, respectively. The successful application of this sensing platform in real samples further validated its practicality, demonstrating the broad potential in the field of colorimetric sensing.
研究领域:
生物化学
·
纳米医学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Zhi Luo,Jing Li,Shenglan Hu,Lingling Zheng,Lixin Xu,Biyang Deng
In this study, Ru(bpy) 3 2+ and oxalate (C 2 O 4 2− ) in Ru@Zn-MOF generated self-enhanced electrochemiluminescence (ECL). The self-enhanced ECL composite exhibited a short electron transfer distance and minimal energy loss, which ensured the high and stable luminescence efficiency of Ru@Zn-MOF. A MnO 2 @AuNPs nanocomposite was introduced into Ru@Zn-MOF via antigen–antibody interactions in the presence of squamous cell carcinoma antigen (SCCA). This significantly quenched the ECL signal due to the combined effect of the dual quenchers, MnO 2 NFs and AuNPs. A highly efficient ECL-RET immunosensor was constructed for the sensitive detection of SCCA in the linear range of 1 fg/mL to 100 ng/mL, with a limit of detection of 0.26 fg/mL (S/N = 3). This immunosensor has broad clinical applications for the quantitative detection of biomarkers.
研究领域:
生物医学工程
·
分析化学
·
肿瘤学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Yuejie Li,Yan Chen,Xinyue Wang,Khalil Md Ibrahim,Guowen Wang,Xinxin Zhang,Hongchao Ma
Recently, employing photoelectrocatalysis (PEC) strategy to eliminate environmental impact and hazards of hard-to-handle antibiotics such as sulfamethoxazole (SMX) has been given increasing attention. Herein, a “honeycomb” heterostructured α-MnO 2 nanowire/NiCo 2 O 4 hollow nanocages PEC catalyst is fabricated by using a continuous assembly process as following: (1) construction of α-MnO 2 nanowire carrier, (2) surface adhesion of ZIF-67, and (3) Co/Ni ion exchange. The as-synthesized Ti/α-MnO₂@NiCo₂O₄ demonstrated excellent PEC performance for degrading SMX, as compared with that of α-MnO 2 , α-MnO 2 @ZIF-67. Especially, the optimized Ti/α-MnO₂@NiCo₂O₄-30 showed removal rate of 98.2 % for SMX in 30 min, outstanding durability (~8000 s), and tolerable reusability (the removal rate can still reach 76.5 % for SMX after five cycles). The improvement of PEC performance for Ti/α-MnO₂@NiCo₂O₄ can be attributed to that the unique porous structure formed numerous electrochemically active sites, and the α-MnO₂ nanowire as common channel for charge transfer promoted the migration of induced carriers. The DFT calculation indicated that a II-scheme heterojunction can be formed over the α-MnO 2 @NiCo 2 O 4 composite, which can effectively inhibit the recombination of induced carriers, facilitate the degradation process. This work provides a valuable approach for constructing nanohybrids with targeted functionalities, opening new possibilities for the application of nanomaterials in wastewater treatment.
研究领域:
环境科学
·
纳米材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2019
·Vol. 11
·期 42
·5472-5477
·
IF 2.378
Linjie Wang,Kun Ye,Jianming Pan,Hongwei Song,Xin Li,Xiangheng Niu
As a typical biomarker for disease diagnosis in clinical practice, alkaline phosphatase (ALP) plays a critical role in regulating the dephosphorylation process of biomolecules. On this account, exploration of an effective and simple means of ALP activity measurement becomes very significant. In this work, we report a catalytic reaction-based colorimetric method for the monitoring of ALP activity via employing nanostructured MnO2 as a favorable oxidase mimic. The prepared MnO2 microspheres exhibit good oxidase-like capacity to induce the catalytic oxidation of colorless 3,3′,5,5′-tetramethylbenzidine (TMB) to deep-blue TMBox; when ALP hydrolyzes ascorbic acid phosphate, the produced ascorbic acid (AA) with a certain reducing power can destroy the MnO2 enzyme mimic by reducing it to Mn2+, dramatically suppressing the TMB chromogenic reaction. Based on the strategy, a convenient and high-performance colorimetric method was established for ALP activity sensing, giving a wide linear range from 0.5 to 120 U L−1. With the help of N-ethylmaleimide as an efficient masking agent for biothiols, the colorimetric approach could provide excellent specificity for ALP activity detection. Reliable and precise measurement of the analyte in practical samples was also verified by our assay, indicating its promise as a feasible tool for clinical diagnosis.
研究领域:
生物化学
·
医学诊断
·
纳米材料科学
✓ 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）