Nature Communications
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2026
·
IF 18.1
Deng Canbin,Xie Yizhan,Tang Jiayue,Lu Xibin,Li Yiqing,Weng Lu-Tao,Li Biao,Li Kaikai,Huang Jiaqiang
Electrochemical reactions are generally accompanied by mechanical evolutions, which, in turn, play a critical role in the performance of the electrochemical system. In aqueous Zn||MnO 2 batteries, the intrinsically structural instability of MnO 2 and rampant side reactions create considerable strain/stress changes in operation. However, the electrochemistry-mechanics-performance relationship of the Zn||MnO 2 cell is still missing. Herein, we decode the electrochemomechanical interplay of Zn||β-MnO 2 pouch cells with different electrolytes via optical fiber sensors. The operando stress monitoring provides proof of the prevailing proton intercalation and Mn dissolution/deposition mechanisms in the system, where the basic zinc salts play a dominant role in stress evolution. Additionally, the non-monotonic stress variation during discharge implies Zn-compensated reaction. For cycling ageing, a negative correlation is found between early stress amplitudes and capacity retention in long cycles. For calendar ageing, greater stress variation during open-circuit ageing is linked with more severe self-discharge. Altogether, this work provides a deep understanding of the electrochemistry-mechanics-performance correlation in aqueous Zn||MnO 2 batteries, offering additional tools for electrolyte screening and battery design.
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2016
·Vol. 27
·期 11
·11541-11547
·
IF 1.798
Liu Hongdong,Hu Zhongli,Ruan Haibo,Hu Rong,Su Yongyao,Zhang Lei,Zhang Jin
Owing to the high reversible capacity, low-cost, natural abundance and environmental friendliness, manganese dioxide (MnO 2 ) is recognized as one of the most appropriate and promising anode materials. In this work, nanostructured MnO 2 anode materials have been achieved via a hydrothermal method. The crystal structure, morphology and specific surface area of as-prepared MnO 2 are characterized by XRD, SEM and BET techniques. As anode materials for lithium-ion batteries, MnO 2 samples show high initial discharge capacity and relatively excellent cyclic performance. The electrochemical performance of MnO 2 samples is related to crystal structure and surface morphology. Monoclinic structure, it is similar to graphene, which is more convenient for the fast ionic transportation into the bulk of the electrode materials. And porous structure, which can accommodate volume expansion, shorten the electron and lithium ion diffusion pathway and provide a large number of electrochemical reactive sites for lithium ion insertion and extraction during cycling.
研究领域:
材料科学
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能源科学
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高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2022
·
IF 4.778
Na Lei,Yin Qiao,Guanfu Liu,Renhao Xu,Guohua Jiang,Muslum Demir,Pianpian Ma
Cobalt-based perovskite SrCo 0.875 Nb 0.125 O 3 is an advantageous electrode material for supercapacitors . However, the particle form of SrCo 0.875 Nb 0.125 O 3 is not conducive to the electrochemical behavior. Based on this, surface MnO 2 modified SrCo 0.875 Nb 0.125 O 3 on carbon cloth (MnO 2 @SrCo 0.875 Nb 0.125 O 3 @CC) has been prepared as supercapacitor electrode. The dandelion-like morphology of MnO 2 significantly increases the specific surface area and inhibits the grain agglomeration of SrCo 0.875 Nb 0.125 O 3 , thus promoting the ion diffusion during the electrochemical process. As a result, the electrochemical performance of the composite is significantly optimized due to the synergistic effect of SrCo 0.875 Nb 0.125 O 3 and MnO 2 . The MnO 2 @SrCo 0.875 Nb 0.125 O 3 @CC electrode yields an ultra-high specific capacitance of 2066.0 mF cm −2 at 2 mA cm −2 current density. Compared with SrCo 0.875 Nb 0.125 O 3 @CC electrode and MnO 2 @CC electrode, this work provides a much improved performance. Besides, an asymmetric supercapacitor composed of MnO 2 @ SrCo 0.875 Nb 0.125 O 3 @CC as positive electrode and CuS@CC as negative electrode exhibits a voltage window of 1.8 V and a specific capacitance of 114.6 mF cm −2 when the current density is 3 mA cm −2 . A high energy density of 51.57 μ Wh cm −2 is achieved at a power density of 4.86 mW cm −2 for the device.
研究领域:
材料科学
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电化学
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高影响因子
POLYMER DEGRADATION AND STABILITY
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2022
·
IF 5.204
Xiuyuan Ma,Jiayue Ma,Mengzhu Li,Yuanxin Gu,Ting Wang
Effective degradation of lignin and further production of small-molecule aromatic chemicals are of great importance in sustainable chemistry. In this experiment, lignin was efficiently oxidatively degraded under mild conditions using inexpensive manganese dioxide rather than a precious metal catalyst, with a lignin degradation efficiency of 66%. A double electrolytic cell system was then used to achieve the recycling of manganese dioxide at the anode while producing hydrogen at the cathode. GC-MC analysis showed that the lignin was degraded to chemicals containing small aromatic molecules such as benzoic acid and benzyl acetate. This experiment provides a new pathway for the cyclic degradation of lignin.
研究领域:
可持续化学
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电化学
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生物质转化
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高影响因子
CHEMICAL PAPERS
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2017
·Vol. 69
·期 5
·722-728
·
IF 1.258
Xu Jun-Hui,Ma Yan-Qiong,Wei Jian-Ping,Li Fang-Mei,Peng Xin-Hua
Ambroxol used as an expectorant in treating respiratory diseases was effectively prepared with a total yield of 62%, with o -toluidine as the feedstock via successive procedures of electrophilic bromination, acetylation, radical benzylic bromination, N -alkylation and hydrolysis processes. The addition of aqueous hydrogen peroxide could enhance the utilisation of liquid bromine in the electrophilic bromination of o -toluidine, avoiding the hazardous HBr generated as a by-product. In addition, liquid bromine promoted by MnO 2 was used efficiently for the radical benzylic bromination of N -acetyl- N -(2,4-dibromo-6-methylphenyl)acetamide under mild conditions.
研究领域:
药物化学
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有机合成
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高影响因子
DESALINATION
·
2024
·
IF 8.3
Zhongsen Yan,Ziyue Zhang,Yaman Huang,Haiqing Chang,Dan Qu,Yuling Jiang,Hongting Wan,Senlin Shao,Fangshu Qu
Membrane scaling and subsequent membrane wetting pose significant impediments to the application of membrane distillation (MD) in treating high-salinity wastewater. This study introduces an innovative in-situ bubble cleaning strategy for the amelioration of membrane scaling in MD processes. A catalytic membrane was fabricated by introducing MnO 2 as a catalyst by electrospinning and the self-cleaning mechanism involving micro-nano bubbles and superhydrophobic surface was systematically investigated. Results showed that the fabricated MnO 2 /PVDF nanofiber membranes (M-FMP) showed superhydrophobic properties, with a water contact angle and rolling angle of 158° and 17°, which significantly improved the membrane's resistance to wetting and fouling. The M-FMP membrane exhibited exceptional performance across ten experimental cycles, achieving a flux recovery rate of over 92 % and demonstrating robust chemical stability following repeated cleanings with 0.006 wt% H 2 O 2 . Notably, CaSO 4 deposition on the M-FMP membrane was approximately 46.0 μg/cm 2 , accounting for only 14.6 % of the deposition observed on the M-P electrospun membrane. The in-situ cleaning process leveraging micro-nano bubbles proved to be significantly more effective than conventional ex-situ cleaning methods, offering superior performance in removing scale deposits. Overall, this pioneering in-situ catalytic self-cleaning approach offers a new option for controlling MD membrane scaling.
研究领域:
环境工程
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材料科学
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高影响因子
NANOTECHNOLOGY
·
2018
·Vol. 29
·期 19
·195603
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IF 3.404
Sisi Dai,Bin Quan,Xiaohui Liang,Jing Lv,Zhihong Yang,Guangbin Ji,Youwei Du
Increasing efforts have recently been devoted to the artificial design and function of nanostructures for their application prospects in catalysis, drug delivery, energy storage, and microwave absorption. With the advantages of natural abundance, low cost, and environment friendliness, a one-dimensional (1D) MnO2 nanowire (MW) is the representative dielectric-loss absorber for its special morphology and crystalline structure. However, its low reflection loss (RL) value due to its thin thickness limits its wide development and application in the microwave absorption field. In this work, artificially designed MnO2@AIR@C (MCs), namely, 1D hollow carbon nanotubes filled with nano-MnO2, were designed and synthesized. It is found that the RL value of the MC is almost lower than −10 dB. Furthermore, the RL value was able to achieve −18.9 dB with an effective bandwidth (−10 dB) of 5.84 GHz at 2.25 mm. Simultaneously, the dielectric and interfacial polarization became stronger while the impedance matching was much better than in the single MWs. Hence, the rational design and fabrication of micro-architecture are essential and MC has great potential to be an outstanding microwave absorber.
研究领域:
材料科学
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电子工程
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DOI
PubMed
高影响因子
ANALYST
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2025
·
IF 3.3
Chenlong He,Huawei Liu,Ming Yin,Jing Chen,Wensi Huang,Han Zhou,Shengming Wu,Yilong Wang
Uric acid (UA) is a key end product of purine metabolism in the human body, and its abnormal level is associated with many diseases, so accurate monitoring is essential. Existing detection methods have many limitations, such as chromatography, which is cumbersome, time-consuming, and not cost-effective, and serum uric acid analysis, which requires specialized equipment and venous blood collection. In the field of uric acid sensors, electrochemical detection is commonly used but prone to interference, and nanomaterials are improved but complicated to modify. To better block the interference via an easily-made nanocomposites involved system, in this study, MnO2 with peroxidase-mimicking activity was used as a protective shell to encapsulate natural uric acid oxidase (UOx), realizing good combination of nanozymes and biocatalysts. The UOx can selectively catalyze UA and generate H2O2, and the MnO2 nanozymes can make up for the insufficiency of UOx, and the two main components synergistically make the activity of UOx@HMnO2 ultra-high, which can offer simple and versatile methods to prepare highly efficient hybrid biocatalysts for the fields of biosensors and biocatalysis. This provides a simple and general method for the preparation of efficient hybridized biocatalysts in the fields of biosensors and biocatalysis. The detection limit of the fabricated uric acid sensor is as low as 0.74 μM, and the concentration of the actual sample is consistent with that of mass spectrometry, which provides a means of non-invasive detection of uric acid with high sensitivity, high specificity and good accuracy.
研究领域:
生物化学
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医学检测
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材料科学
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DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2022
·
IF 9.221
Yang Lu,Xu Li,Ling Zhang,Xu Zhao,Xu Yan,Chenguang Wang,Fangmeng Liu,Peng Sun,Xiaomin Liu,Geyu Lu
To address the problems of short donor-acceptor interaction distance and poor structural stability of the complexes in existing upconversion based luminescence resonance energy transfer (UC-LRET) biosensing technologies. We constructed a LiErF 4 @ZIF-MnO 2 nanoplatform taking advantages of the long-range energy migration characteristics of the energy level strongly correlated LiErF 4 donor and the in situ immobilization technology on the ZIF surface. It significantly improves the solidity of the donor-acceptor structure, breaks the limitation of short LRET distance using the long-range energy migration among Er 3+ ions, realizes the fully utilization of donor LiErF 4 luminescence, and thus effectively improves the LRET efficiency. As a demonstration, this platform exhibited highly sensitive to GSH in solution with a detection limit of 0.14 μM. It presented good photostability, GSH-specific selectivity, and structural robustness under different physiological conditions . We also achieved real-time monitoring of GSH in cells, and effectively distinguished cancer cells from normal cells by the difference in GSH expression levels. The concept of constructing this platform can be of wide interest in the field of biosensing. And the use of long-range energy migration to break the limitations of the short-range action of LRET will make upconversion nanoprobes a more powerful tool for future detection applications.
研究领域:
分析化学
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生物医学工程
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纳米技术
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DOI
高影响因子
LANGMUIR
·
2023
·
IF 3.9
Qiang Ma,Lijun Jiang,Bowen Yang,Bowen Xu,Qingyuan Wang,Qihong Wu,Ping Ning,Yingjie Zhang,Jin Huang,Jiming Hao
Gaseous thallium (Tl) pollution events, primarily caused by non-ferrous mineral refineries and fossil fuel combustion, have increased over the past few decades. To prevent gaseous Tl distribution from flue gas, MnO2/CeO2@HKUST-1 (MCH) was synthesized and found to achieve a gaseous Tl(I) removal level of up to 90% at 423 K, a weight hourly space velocity (WHSV) of 2000 h–1/mL with an Mn dose of 10%, maintained over 10 h. The best Mn/Ce ratio was found to be 9:1. To further investigate surface kinetic behavior, four commonly used kinetic models were applied, including the Eley–Rideal (ER) model, Langmuir–Hinshelwood (LH) model, Mars–van Krevelen (MVK) model, and pseudo-first-order (PFO) model. While the ER and LH models had the slightest deviation, the MVK model was the most reliable. The CatMAP software was also used to match the simulation deviation. This work demonstrated the Tl removal mechanism and provided insights into the accuracy of kinetic models on minor-radius heavy metal. Thus, this research may help promote the design of reactors, heavy metal removal rates, and flue gas purification technology selection.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
COMPOSITES PART B-ENGINEERING
·
2019
·
IF 6.864
Ling Kang,Chun Huang,Jian Zhang,Mengyao Zhang,Nan Zhang,Yaqin He,Chen Luo,Chaolun Wang,Xiaofeng Zhou,Xing Wu
The intrinsically low electrical conductivity and the poor cycling stability are two major obstacles of manganese oxides to hamper their further application in high-performance supercapacitors . One effective way to enhance their electrochemical properties is construction of appropriate nanocomposite with different structures. Herein, we demonstrated the fabrication of a hierarchical MnO 2 nanowires-Mn 3 O 4 nanoparticles nanocomposite by an effective and innovative two-step synthesis strategy. Further, the Mn 3 O 4 nanoparticles were exfoliated from the surface of α -MnO 2 nanowires . And the optimum composition was calculated to be ~ 35% Mn 3 O 4 and ~ 65% α -MnO 2 . The capacitance of the optimized MnO 2 –Mn 3 O 4 nanocomposite electrode reaches 278.2 F g −1 at a current density of 20 A g −1 , and the capacitance retained at 99.3% even after 5000 cycles. The asymmetric supercapacitor was also fabricated with optimized MnO 2 –Mn 3 O 4 as the positive electrode and activated carbon as the negative electrode . It could deliver an excellent energy density of ~ 41.3 Wh kg −1 at a power density of ~ 1153W kg −1 . And the superior cycling stability achieves as well. The excellent capacitance properties of the MnO 2 –Mn 3 O 4 nanocomposite can be attributed to the hybrid structure, in which one-dimension α -MnO 2 nanowires provide a super highway for electron and ion transfer and Mn 3 O 4 nanoparticles attached offer the abundant pseudocapacitive sites for charge storage.
研究领域:
材料科学
·
能源存储与转换
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高影响因子
Catalysis Science & Technology
·
2019
·Vol. 9
·期 18
·5090-5099
·
IF 5.726
Yi Yu,Shuilian Liu,Jian Ji,Haibao Huang
Ozone pollution has aroused worldwide concern for its adverse impact on both the environment and human health. A series of MnO2 catalysts with different crystallinities were prepared for ozone decomposition. The crystallinity of MnO2 was regulated by varying the calcination temperature of an amorphous MnO2. The calcination temperature was confirmed oddly to have a significant effect on the morphology, the textural properties and the surface chemistry of manganese oxides. Both the pristine amorphous MnO2 and the one calcined at 300 °C (MnO2-300) exhibited superior catalytic activity for ozone decomposition owing to the abundant surface oxygen vacancies, large specific surface area, and high oxygen mobility, which were derived from the amorphous structure. FTIR and in situ DRIFTS experiments revealed that calcination generated the hydrophobic MnO2-300, which showed enhanced water resistant ability compared with the pristine amorphous MnO2, and significantly suspended catalyst deactivation. Moreover, the oxidation state of Mn slightly changed in the used MnO2-300, further maintaining the high activity. This work may broaden the horizons of designing catalysts with high stability and efficiency for ozone decomposition.
研究领域:
环境科学
·
催化化学
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高影响因子
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