CATALYSIS LETTERS
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2023
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IF 2.8
Gao Youxin,Zhou Aojia,Min Jie,Yu Chengbing
A simple redox method was used to synthesize δ-MnO 2 and introduce the first main group metal elements between the layers of δ-MnO 2 . Through testing, we found that δ-MnO 2 doped with Rb + demonstrated the best catalytic performance for formaldehyde removal. Under the condition of 36 °C and the initial formaldehyde concentration of 200 ppm, a 200 mg of Rb-MnO 2 could achieve the percentage of removal of formaldehyde 97.48%. We found that doping elements with low electronegativity and large ion radius could weaken the Mn–O bond, which is conducive to the formation of reactive oxygen species and improve the performance of catalytic oxidation. Graphical Abstract
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Wenyu Zhao,Qingquan Kong,Xiaoqiang Wu,Xuguang An,Jing Zhang,Xiaonan Liu,Weitang Yao
Aqueous zinc-ion batteries (ZIBs) are potential candidates for achieving considerable energy savings owing to their environmental benignity and low cost. At present, however, Mn 2+ dissolution causes structural failure in manganese-based cathodes. Therefore, addressing this issue is vital for improving their cycling stability and specific capacity. Herein, ε-MnO 2 was obtained by annealing MnCO 3 at 350 °C. Subsequently, ε-MnO 2 was coated with a carbon layer (carbonizing D-glucose) to obtain ε-MnO 2 @C, which effectively mitigated the Mn 2+ dissolution as well as the side reactions between the electrode and electrolyte. Electrochemical results revealed a significant improvement in the specific capacity (280 mAh g −1 at 0.2 A g −1 ) and capacity retention (∼91% over 1700 cycles at 1 A g −1 ) of the ε-MnO 2 @C cathode.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yu Tian,Pengxia Zhang,Zhen Ma,Mengya Li,Yali Fan,Rui Guo,YanFeng Li,Yingying Zhang
Mesenchymal stem cells (MSCs) have become an important choice for regenerative medicine because of their specific differentiation ability. However, MSCs are rapidly cleared by direct injection, and living cells need to be embedded in a 3D semipermeable hydrogel matrix to prolong cell retention time to enhance therapeutic effects. Herein, MnO 2 doped alginate hydrogel was prepared for single stem cell encapsulation (SA@MSC-MnO 2 ) with maintaining biological activity. This hydrogel system could accelerate the differentiation potential of MSCs and promoted 60 % repair of bone defects within 8 weeks. Besides, the doping of MnO 2 could react with H 2 O 2 to generate H 2 O and O 2 , thus achieving the goal of reactive oxygen species (ROS) clearing and improving the bone regeneration effects. We believe that this single stem cell hydrogel encapsulation system will further promote the clinical application of stem cell therapy.
研究领域:
再生医学
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生物材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
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IF 8.758
Qin Zhao,Xinjun Huang,Mengmeng Zhou,Zhengnan Ju,Xiaodong Sun,Ying Sun,Zihang Huang,Hui Li,Tianyi Ma
Rechargeable aqueous Zn–MnO2 batteries using a mild electrolyte have attracted considerable interest because of their high output voltage, high safety, low cost, and environmental friendliness. However, poor cycling stability remains a significant issue for their applications. Equally, the energy storage mechanism involved is still controversial thus far. Herein, porous polyfurfural/MnO2 (PFM) nanocomposites are prepared via a facile one-step method. When tested in a rechargeable aqueous Zn–MnO2 cell, the PFM nanocomposites deliver high specific capacity, considerable rate performance, and excellent long-term cyclic stability. Based on the experimental results, the role of the hydrated basic zinc sulfate layer being linked to the cycling stability of the aqueous rechargeable zinc-ion batteries is revealed. The mechanistic details of the insertion reaction based on the H+ ion storage mechanism are proposed, which plays a crucial role in maintaining the cycling performance of the rechargeable aqueous Zn–MnO2 cell. We expect that this work will provide an insight into the energy storage mechanism of MnO2 in aqueous systems and pave the way for the design of long-term cycling stable electrode materials for rechargeable aqueous Zn–MnO2 batteries.
研究领域:
材料科学
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电化学
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储能技术
✓ 已验证
DOI
PubMed
高影响因子
Nanoscale Research Letters
·
2018
·Vol. 13
·期 1
·1-12
·
IF 3.125
Wang Qi,Ma Chunlei,Tang Jianke,Zhang Cuihong,Ma Lihua
Taking advantages of reticular proteins and reductive groups on the surface, eggshell membrane (ESM) was selected to synthesize MnO 2 nanoparticles from potassium permanganate through a super simple way in which ESM acted as both template and reductant. This process avoided harsh reaction conditions or complicated aftertreatments and thus owned the merits of green synthesis, handy operation, low cost, and easy purification. The ESM-templated MnO 2 nanoparticles (MnO 2 NPs/ESM) were characterized, and the content of nanomaterials on the template was tested. MnO 2 NPs/ESM showed a good capacity for decontamination of tetracycline hydrochloride (TCH). The macroscopical materials can be separated easily by taking the membrane out to stop the degradation instead of centrifugation or filtration. It was studied that 72.27% of TCH (50 mg/L) was decontaminated in 20 min by 0.1920 g/L MnO 2 nanoparticles, and removal efficiency could reach 83.10% after 60 min under buffered condition. The kinetics was studied with or without buffer, and it was concluded that the degradation process followed a pseudo-second-order model. The facile synthesis of materials and effective degradation would facilitate the nano-MnO 2 -based decontamination applications.
研究领域:
材料科学
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环境科学
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生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
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2016
·Vol. 6
·期 43
·36484-36490
·
IF 3.289
Xiaoxia Wang,Baoqin Zhang,Mingxun Yu,Jingquan Liu
Hierarchical hybrid nanostructures are desirable materials for microwave absorption (MA) capacity. However, how to obtain this kind of versatile structural materials still remains a great challenge. In this work, a novel MA composite of MnO2@NiMoO4 was synthesized via two-step hydrothermal processes combined with a simple annealing process. As confirmed by X-ray diffraction, scanning electron microscopy, energy-dispersive spectrometry, and transmission electron microscopy analysis, the well-defined NiMoO4 nanosheets could uniformly cover the surface of the MnO2 nanorods. Compared with pure MnO2 nanorods, these hierarchical composite structures could provide a higher superficial area, and more effective components, which will favor the penetration of microwaves into the absorber effectively instead of reflecting it, and then translate it into thermal energy. The minimum reflection loss (RL) value of MnO2@NiMoO4 composites was −31.4 dB at 11.2 GHz with a thickness of 3 mm, and the band of reflection loss was below −10 dB when frequency was in the range from 9.6 to 14.1 GHz. However, the minimum RL value of MnO2 was only −12.5 dB at 10.4 GHz with a thickness of 3 mm. The significantly enhanced microwave absorption of MnO2@NiMoO4 composites is mainly attributed to the hierarchical hybrid nanostructures, multi-effective components, good impedance matching, and interfacial polarization between MnO2 and NiMoO4. Meanwhile, the surface attached NiMoO4 is useful to increase the multiple reflection of electromagneticwaves. It is believed that these MnO2@NiMoO4 composites could serve as an excellent microwave absorber in practical applications.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2016
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IF 7.145
Zhibin Geng,Yanxiang Wang,Jinghai Liu,Guangshe Li,Liping Li,Keke Huang,Long Yuan,Shouhua Feng
Pure phase manganese oxides have been widely studied as water oxidation catalysts, but further improvement of their activities is much challenging. Herein, we report an effective method to improve the water oxidation activity by fabricating a nanocomposite of Mn3O4 and δ-MnO2 with an active interface. The nanocomposite was achieved by a partial reduction approach which induced an in situ growth of Mn3O4 nanoparticles from the surface of δ-MnO2 nanosheets. The optimum composition was determined to be 38% Mn3O4 and 62% δ-MnO2 as confirmed by X-ray photoelectron spectra (XPS) and X-ray absorption spectra (XAS). The δ-MnO2–Mn3O4 nanocomposite is a highly active water oxidation catalyst with a turnover frequency (TOF) of 0.93 s–1, which is much higher than the individual components of δ-MnO2 and Mn3O4. We consider that the enhanced water oxidation activity could be explained by the active interface between two components. At the phase interface, weak Mn–O bonds are introduced by lattice disorder in the transition of hausmannite phase to birnessite phase, which provides active sites for water oxidation catalysis. Our study illustrates a new view to improve water oxidation activity of manganese oxides.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2018
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IF 5.667
Xiang Ran,Zhen Liu,Zhenzhen Wang,Fang Pu,Jinsong Ren,Xiaogang Qu
High sensitive detection and monitoring of miRNAs in living cells have obtained considerable attention for clinical diagnosis of diseases. However, there are still enormous challenges for developing new method of quantification of miRNA in vivo. Herein, an intelligent MnO 2 -carried catalytic DNA machine (MCDM) was constructed for direct visualization of MicroRNAs in vivo with high selectivity and extremely low detection limit. MnO 2 nanosheets were used as a degradable carrier to introduce the DNA machine into cells. Benefiting from the enhanced permeability and retention (EPR) effect, the MnO 2 -carried probes could accumulate in tumor tissue, realizing a direct visualization of low concentration of miR-21 in the tumor of living animals in situ.
研究领域:
生物化学
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分子生物学
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医学诊断
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
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2017
·
IF 4.798
Guangdi Nie,Xiaofeng Lu,Maoqiang Chi,Yun Zhu,Zezhou Yang,Na Song,Ce Wang
The incompetency of conventional single-phase electrode materials remains a stumbling block for making further breakthroughs in high-performance supercapacitors. In this work, α-Fe 2 O 3 nanotube@MnO 2 nanosheet hierarchical networks with tunable mass ratio of MnO 2 to α-Fe 2 O 3 are prepared via a simple two-step method for supercapacitor electrodes. The α-Fe 2 O 3 @MnO 2 core-shell heterostructures, especially the FM10020 containing 60.1 wt% of MnO 2 , exhibit a larger specific capacitance of 289.9 F g −1 at 1.0 A g −1 , a better rate capability of 40.8% at 5.0 A g −1 and a higher cycling stability of 85.3% after 1200 cycles than the pure MnO 2 , highlighting the advantages of such unique configuration accompanied by the synergistic effect. It is believed that these intriguing results will provide an alternative way for the construction of metal oxide-based composite nanostructures with improved electrochemical performance.
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
IONICS
·
2024
·
IF 2.4
Yan Lichen,Chen Wei,Song Zehui,Xiao Li
A novel NiO/MnO 2 pompon-like hybrid structure was synthesized through a facile one-step hydrothermal in situ growth approach in this paper. NiO nanosheets grow on MnO 2 pompon-like microsphere to form typical hybrid structures which significantly increase the abundant active sites of electrode materials. The resulting NiO/MnO 2 electrode material exhibits an impressive specific capacity of 2706.1 F/g at a current density of 1 A/g. Remarkably, NiO/MnO 2 pompon-like hybrid structure shows excellent cycling performance and its capacity retention is maintained at 84.8% and the charge–discharge efficiency at 96% after 15,000 cycles. Even after undergoing 40,000 cycles, the electrode material maintains an outstanding charge–discharge efficiency of 95.2% with capacity retention of 69%, which revealing promising application as long-term 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
ACS Catalysis
·
2017
·
IF 10.614
Shaopeng Rong,Pengyi Zhang,Yajie Yang,Lin Zhu,Jinlong Wang,Fang Liu
Formaldehyde (HCHO) causes increasing concerns, because of its ubiquitous presence in the indoor environment and its irritating and carcinogenic nature, with regard to humans. The fast abatement of HCHO is of significant practical interest at room temperature. In this paper, we fabricate a three-dimensional manganese dioxide framework (3D-MnO2), which has interconnected network structures, low mass density (∼7.3 mg cm–3), and high absorption capacity for organic liquids. In particular, the 3D-MnO2 showed excellent activity and stability for HCHO oxidation at room temperature, achieving 45% of 100 ppm of HCHO mineralized into CO2 under high gas hourly space velocity (GHSV = 180 L gcat–1 h–1). The excellent performance of 3D-MnO2 catalysts in decomposing HCHO can be ascribed to their quick reversibility and high water content for replenishing the consumed surface hydroxyl groups during HCHO decomposition, and fully exposed active reaction sites. It is valuable to know that inexpensive metal oxides such as MnO2 can transform ppm-level HCHO into harmless CO2 in a timeframe as brief as a subsecond at room temperature.
研究领域:
环境科学
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催化
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空气污染控制
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Hongwei Tang,Mingkun Wang,Juan Xie,Kang Zhang,Pengcheng Su,Xiangyi Zheng,Kexin Wan,Huilong Dong,Jishi Wei,Yihui Li
Layered MnO2 is regarded as one of the most prospective cathode materials for aqueous zinc-ion batteries (AZIBs), yet it is impeded by its inferior conductivity and the poor cycling stability caused by the manganese dissolution. Herein, a facile alkali-metal-ion intercalation strategy is proposed, where sodium ion and potassium ion are adopted to verify the universality of the alkali-metal-ion intercalators in promoting the zinc-ion storage capability of MnO2. The intercalated alkali-metal ions could not only effectively promote the structural stability by serving as pillars but also improve the conductivity by modulating its electronic structure. Moreover, the extra oxygen defects are introduced during the intercalation of alkali-metal-ion “pillars”, which is conducive to the mitigation of manganese dissolution by regulating the Mn–O bond and acceleration of Zn2+ kinetics. As a result, the proposed Na+-intercalated MnO2 (NMO) and K+-intercalated MnO2 (KMO) present enhanced electrochemical performances and Zn2+ transfer kinetics. Specifically, NMO 600 and KMO 650 deliver the capacities of 236.3 and 158.2 mAh g–1 after 100 cycles at 0.1 A g–1, respectively, which are larger than that of pristine δ-MnO2. This work substantiates the potential of alkali-metal-ion “pillars” in improving the zinc-ion storage capability of layered MnO2 cathode and provides a promising way to develop high-performance manganese-based cathode materials via a facile solid-phase method.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 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）