JOURNAL OF POWER SOURCES
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2025
·
IF 7.9
Xiaodong Liang,Xin Liu,Peixiong Wang,Zhongxian Guo,Xin Chen,Jia Yao,Jingying Li,Yi Gan,Lin Lv,Li Tao,Hanbin Wang,Houzhao Wan,Jun Zhang,Hao Wang
Manganese-based cathode materials for zinc-ion batteries provide a moderate voltage window and good specific capacity. However, the disproportionation reactions cause manganese to dissolve during the charge and discharge process, seriously affecting its cycle stability. Herein, nickel-doped α phase manganese dioxide (Ni-MnO 2 ) obtained by ion exchange effectively improves the lattice stability and cycle stability of manganese dioxide (MnO 2 ). The introduction of Ni 2+ supports the lattice structure of MnO 2 , reduces structural damage and manganese (Mn) dissolution caused by the Jahn-Teller effect during the cycle, and improves its electronic conduction and ion migration capabilities. It quickly completes the activation process at a current density of 0.1 A g −1 and stably maintains a capacity of 233 mAh g −1 . After 2800 cycles at 1 A g −1 , the capacity retention rate remains 96.3 %. In contrast, MnO 2 without ion exchange modification has dropped to 19.6 % after 130 cycles. This paper demonstrates the feasibility of the ion exchange process, bringing more precise and effective ideas to the research and development of high-performance aqueous zinc-manganese batteries.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Chao Feng,Gaoyan Xiong,Fei Jiang,Qianqian Gao,Chong Chen,Yuan Pan,Zhaoyang Fei,Yanpeng Li,Yukun Lu,Chenguang Liu,Yunqi Liu
Through morphology control and structure construction of manganese catalyst to improve the conversion of VOCs is still a significant challenge in the field of environmental catalysis. Herein, secondary sphere structured δ-type manganese oxide (MnO 2 -SS) was synthesized via a simple room temperature two-step method. Compared with other sphere-type MnO 2 samples, MnO 2 -SS exhibited a higher propane oxidation activity (T 90 = 238 ℃), turnover frequency (14.54 × 10 −7 s −1 at 240 ℃), and stability in H 2 O, NO 2 , and CO atmospheres. Experimental results indicated that MnO 2 -SS exhibited an ultrahigh specific surface area, a high surface concentration of active Mn 4+ species and superior surface oxygen mobility. In-situ DRIFTs revealed that active oxygen species exhibit a key role in formation and dissociation of intermediate carboxylates. Electron paramagnetic resonance, O K-edge results and density functional theory calculation revealed that numerous oxygen vacancies existed on MnO 2 -SS. These vacancies can facilitate adsorption and activation of O 2 to generate active reactive oxygen species, which lead to superior propane and intermediate carboxylates oxidation activity. This work provides new strategy to enhance the surface oxygen activity of manganese oxide.
研究领域:
环境催化
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材料科学
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化学工程
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DOI
高影响因子
International Journal of Electrochemical Science
·
2023
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IF 1.5
Jie Huang,Yuting Wang,Hangchun Deng,Jianfa Chen,Jianhua Ding,Chunyan Wang
Herein, homogeneously dispersed Pt and MnO 2 nanoparticles were anchored to single-walled carbon nanohorns (SWCNHs) to obtain an efficient electrode material for supercapacitors. XPS and TEM analysis of the Pt/MnO 2 @SWCNH surface morphology confirms that the SWCNHs exhibit a dahlialike cluster structure with Pt/MnO 2 nanoparticles embedded in the interstices of the SWCNH horn structure to form a three-dimensional conductive network. This structure not only improves the overall conductivity of the composite but also provides more electron transfer pathways for the MnO 2 nanoparticles. Accordingly, the as-prepared Pt/MnO 2 @SWCNH composite displays a high specific capacitance (314.5 F/g at 1 A/g), good cycling stability (86.89% capacitance retention after 1000 cycles at 1 A/g), and remarkable rate performance (254.8 F/g at 10 A/g). Among reported composites of metal oxides, precious metals, and carbon materials, the prepared Pt/MnO 2 @SWCNH composite has outstanding electrical properties and is a highly promising candidate as supercapacitor.
研究领域:
材料科学
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能源存储
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DOI
高影响因子
Advanced Materials Technologies
·
2020
·Vol. 5
·期 8
·2000272
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IF 5.969
Xingxing Li,Yanan Ma,Peizhi Shen,Chuankun Zhang,Minglei Cao,Shaojun Xiao,Jinfeng Yan,Shijun Luo,Yihua Gao
Ti 3 C 2 T x MXene, as a new 2D material, with unique physical and chemical properties, is ideal for building high performance miniaturized electrochemical energy storage devices. However, the operating voltage window of Ti 3 C 2 T x based microsupercapacitor (MSC) in symmetric structure is very narrow (≤0.6 V), which affects its practical application. Herein, a flexible asymmetric microsupercapacitor (AMSC) based on Ti 3 C 2 T x //polypyrrole (PPy)/MnO 2 is reported, where Ti 3 C 2 T x is deposited on graphite paper (GP) by electrophoresis method as negative electrodes, MnO 2 and PPy are electrochemically deposited on GP successively as positive electrodes, and polyvinyl alcohol/sulfuric acid (PVA/H 2 SO 4 ) as the quasi-solid electrolyte. This AMSC based on Ti 3 C 2 T x //PPy/MnO 2 operates at 1.2 V voltage window, which is two times wider than symmetric Ti 3 C 2 T x based MSC. And its maximum areal capacitance and areal energy density can reach up to 61.5 mF cm −2 and 6.73 µWh cm −2 respectively. Moreover, three above AMSCs in series connection can turn on three lights after being charged. And the AMSC also shows high flexibility under mechanical bending level (bending angle with 0°–180°). The flexible AMSC based on Ti 3 C 2 T x //PPy/MnO 2 with ultrahigh energy density is a promising candidate for exploiting and fabricating next-generation miniature integrated energy storage devices.
研究领域:
材料科学
·
能源存储技术
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DOI
高影响因子
TALANTA
·
2020
·
IF 5.339
Qi Wang,Lingfang Li,Xiaodong Wang,Chuan Dong,Shaomin Shuang
Benefiting from their excellent optical absorption and electron transfer properties, manganese dioxide nanomaterials have been widely applied for fluorescence-based nanosensors. In this work, graphene quantum dots (GQDs) wrapped square-plate-like MnO 2 nanocomposite was synthesized from potassium permanganate via an in situ redox procedure under ultrasonication with poly(allylamine hydrochloride) (PAH) being involved. Through an effective fluorescence resonance energy transfer (FRET) process and inner filter effect (IFE) between GQDs and MnO 2 , the fluorescence of GQDs was quenched. Furthermore, the introduction of glutathione (GSH) decomposed MnO 2 and caused fluorescence recovery of GQDs. Therefore, a MnO 2 mediated nanosensor was established for fluorescent turn-on sensing of GSH. A satisfactory linear range was found to be 0.07–70 μM and the detection limit was as low as 48 nM. Besides, the fluorescent recognition of cancer cells using GQDs-MnO 2 nanocomposite was achieved because of the obviously higher GSH content in cancer microenvironment than normal cells. This nanosensor was constructed directly in GQDs solution in the presence of PAH without the complicated modifications or connections, making it a facile and novel nanosensor for GSH.
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产品关联
DOI
PubMed
高影响因子
Food Analytical Methods
·
2020
·Vol. 13
·期 10
·1842-1851
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IF 2.667
Qu Fei,Sun Yang,Guo Shuxian,Yan Hang,You Jinmao
2,4-Dichlorophenoxyacetic acid (2,4-D) is a typical chlorinated aromatic herbicide which is widely used because of its low cost. Herein, a new fluorescent assay for 2,4-D is developed based on covalent organic frameworks (COFs) and MnO 2 nanosheets. The fluorescence of COFs is quenched effectively by MnO 2 nanosheets. Ascorbic acid 2-phosphate (AAP) is hydrolyzed by alkaline phosphatase (ALP) to produce ascorbic acid (AA), which reduces MnO 2 nanosheets into Mn 2+ , so the quenched fluorescence recovers. Additionally, 2,4-D can inhibit the catalytic activity of ALP. Therefore, the addition of 2,4-D quenches the fluorescence of COF-MnO 2 system again. Under the optimum conditions, this assay displays a wide linear range of 2,4-D from 1 to 150,000 ng/mL with a limit of detection of 0.36 ng/mL. Then, this method is successfully used to measure 2,4-D in rice, millet, and cucumber samples with satisfactory recoveries. Compared with other probes for 2,4-D detection, both of COFs and MnO 2 nanosheets are stable, cost-effective, and easily prepared. The sensitivity and linear range of 2,4-D in this strategy are superior to most reported works. This is the first time that a novel sensing platform using fluorescent COFs and MnO 2 nanosheets is developed for 2,4-D.
研究领域:
分析化学
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环境科学
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食品安全
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产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
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2019
·
IF 9.518
Ying Gan,Ning Hu,Chuanjiang He,Shuqi Zhou,Jiawei Tu,Tao Liang,Yuxiang Pan,Dmitry Kirsanov,Andrey Legin,Hao Wan,Ping Wang
Urolithiasis commonly occurs in kidney and ureteral, and may cause local organ/tissue damage, even kidney failure. The incidence of this disease is increasing worldwide, in which calcium oxalate is the major composition forming the urinary calculus. Therefore, to monitor this disease for the prevention and treatment, measuring the oxalate in the urine is of great significance. Here, a rapid and sensitive colorimetric method was developed based on 3,3',5,5'-tetramethylbenzidine-manganese dioxide (TMB-MnO 2 ) nanosheets for oxalate detection. MnO 2 nanosheets acted as an efficient biomimetic oxidase to catalyze the reaction with TMB and oxalate. Pale yellow TMB can be oxidized to blue oxide TMB catalyzed by BSA-stabilized MnO 2 nanosheets, and oxalate can selectively inhibit this reaction by consuming and reacting with MnO 2 nanosheets, thus achieving the quantitative detection of oxalate. Moreover, a home-made bionic electronic-eye (E-eye) system was developed as a portable in-situ detection platform to efficiently measure the oxalate concentrations in 10 s by direct photographing. By optimizing experimental conditions, this method shows a wide linear range (7.8 μM to 250 μM) and a low detection limit (0.91 μM) for oxalate detection. Besides, this method exhibits high selectivity even with 80-fold interfering chemicals. Furthermore, the performance of the method was validated by testing the artificial urine samples, indicating its great potential for monitoring and diagnosis of urolithiasis in point-of-care applications.
研究领域:
生物化学
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分析化学
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医学诊断
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产品关联
DOI
PubMed
高影响因子
TALANTA
·
2019
·
IF 4.916
Xiaoli Wu,Pengsi Wang,Shaoyan Hou,Peiling Wu,Jian Xue
Organophosphorus pesticides (OPs) are frequently for pest control in the agriculture industry. Accumulation of OPs is harmful to the environment and human health. Thus, facile and portable detection of organophosphorus pesticides is of great importance. Among these methods, the fluorescence assay holds the advantages of high sensitivity, simplicity, nondestructive properties. Conventional fluorophores have the drawbacks of poor photostability and low signal-to-noise ratio due to their aggregation-caused quenching drawbacks at high concentration or in the aggregate state. Aggregation-induced emission fluorogens (AIEgens) are one key to develop next-generation fluorescence sensor due to their high emission efficiency in the aggregated state. 1,2-bis[4-(3-sulfonatopropoxyl) phenyl]-1,2-diphenylethene (BSPOTPE) is a typical AIE molecule containing two hydroxyl group . In this study, a fluorescence sensor based on BSPOTPE-SiO 2 –MnO 2 sandwich nanocomposites was fabricated. Thiocholine (TCh), which produced from acetylthiocholine(ATCh) by the hydrolysis of acetylcholinesterase (AChE), can “turn on” the fluorescence sensor. Based on the inhibition effect of OPs on AChE activity and the corresponding “turn off” effect on the fluorescence sensor, an AIE-based assay for OPs determination was developed. The fabricated sensor for paraoxon determination has a good linear relationship in the range of 1–100 μg/L and the LOD of 1 μg/L. Moreover, a simple, convenient fluorescence strip for visual semi-quantitative of OPs was fabricated, indicating this “on-off” fluorescent sensor is promising for on-site and infield detection.
研究领域:
环境科学
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分析化学
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生物医学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 44
·25266-25273
·
IF 3.049
Jiaxing Song,Tao Guo,Wen Ding,Miao Yao,Fengli Bei,Xiaonan Zhang,Junyi Huang,Xiang Fang
To explore the effect of the addition of poly(vinylidene fluorine) (PVDF) to a nanothermite system, an Al/MnO2/PVDF energetic nanocomposite was prepared using an electrospray method, Al/MnO2 nanothermite was prepared as a control group. Then, the energetic nanocomposite and nanothermite were tested and analyzed by XRD, FE-SEM and TG-DSC, and the reaction products were collected. The results show that energetic nanocomposite would have three obvious exothermic peaks in the range of room temperature to 800 °C with a total more than 1700 J g−1 heat release while the control experiment, Al/MnO2 nanothermite, could be found one exothermic peak with a 1100 J g−1 heat release. The residues are mainly MnAl2O4, MnF2 and AlF3 which indicates that Al/MnO2/PVDF energetic nanocomposite could make full use of manganese oxide. Finally, thermal analysis experiments were carried out under different heating rates to calculate the activation energy. The calculation results show that the addition of PVDF could significantly reduce the activation energy, which would help spark the thermite at comparatively low energy and temperature.
研究领域:
材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Kailin Li,Xiaoying Liu,Tianxu Zheng,Debin Jiang,Zheng Zhou,Chuanqi Liu,Xianming Zhang,Yuxin Zhang,Dusan Losic
Controlled synthesis of tunable Mn-iron-oxide (Mn-FeOx) hybrids with unique three-dimensional (3D) porous structure based on diatoms for high performance supercapacitors is demonstrated. Successful transition process from MnO 2 to FeOOH on diatomite was performed by two-step hydrothermal method and resultant replicas with 3D diatom morphology were obtained via etching process. The fabricated MnFeOx-0 diatom replica without transition was composed by MnO 2 nanosheets and exhibited a high specific capacitance (228.6 F g −1 at 1 A g −1 ), good rate capability (74.6% retention after current density were increased to 10 A g −1 ), high coulombic efficiency (about 93.1% at 10 A g −1 ), and steady cycling performance (94.3% capacitance retention after 4000 cycles). MnFeOx-110 replica with FeOOH nanorods owned 224.6 F g −1 at 1 A g −1 , high coulombic efficiency about 80% at 10 A g −1 and steady cycling performance about 92.5% retention after 4000 cycles. Finally, an asymmetric supercapacitor was assembled based on MnO 2 nanosheets as the positive electrode and FeOOH nanorods as the negative electrode, which delivered a wide potential of 2 V with maximum energy density of 51.5 Wh kg −1 and power density of 9.1 kW kg −1 . Considering that the two replicas owned great energy storage property, it opens an opportunity for rational design of the diatom morphology samples applied to high-performance supercapacitors.
研究领域:
材料科学
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能源存储
·
纳米技术
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jing Wang,Feng Zheng,Yi Yu,Pengfei Hu,Mingjun Li,Jiao Wang,Jifang Fu,Qiang Zhen,Sajid Bashir,Jingbo Louise Liu
Supercapacitors with improved specific capacitance , long cycling life, high power density and energy density are fabricated to close the gap between traditional and emerging energy storage. We develop interactive ternary metal oxides nano-ribbon electrodes used to assemble symmetric supercapacitor. The well-aligned vanadium oxide ribbon arrays act as the matrix, growing from nickel oxide/nickel substrate and then being grafted by manganese oxide nanoparticles. These tri-metallic oxides are formed in a cost-effective and green hydrothermal chemistry. The electrodes composed of ribbon arrays retain their crystallographic structure during charging and discharging processes, enabling steadiness at 83.6 % after 10,000 cycles. These as-prepared electrodes demonstrate a specific capacitance of 788 F g −1 at 5 mV s −1 . The symmetrical supercapacitors are assembled using triple component electrodes, achieving a high energy density of 138 W h kg −1 at a power density of 450 W kg −1 . These binderless single-cell devices are reported with a simplified design showing 10–20 times higher energy density in comparison with reported results of the V 2 O 5 -MnO 2 system. The nanografting results in reactive interfaces with interpenetrating channels for efficient ion transport and electron conduction. The advances to design nanostructured supercapacitor materials are based on these heterojunction arrays to enhance their supercapacitive performances.
研究领域:
材料科学
·
能源存储技术
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产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Rui Liu,Suleiman A. Haruna,Shujat Ali,Jing Xu,Qin Ouyang,Huanhuan Li,Quansheng Chen
The irrational use of tetracycline (TC) poses a serious threat to human health, which calls for the development of efficient and reliable detection methods. Herein, an ideal sensor based on luminescence resonance energy transfer (LRET) between aptamer modified up-conversion nanoparticles as signal probes (donors) and manganese dioxide (MnO 2 ) nanosheets (acceptors) was developed for TC detection in food samples. As a result of van der Waals forces between the nucleobases of the aptamer and the basal plane of MnO 2 nanosheets, the distance of the donors and acceptors was shortened. The emission spectrum of the signal probes and the absorption spectrum of MnO 2 nanosheets overlapped, resulting in LRET, and quenching of up-conversion luminescence. The TC-specific aptamer could fold into a complex conformational structure to provide recognition sites for TC. In the presence of TC, the aptamer was found to preferentially combine with TC due to the stacking of planar moieties, hydrogen bonding interactions and molecular shape complementarity, causing the separation of signal probes and nanosheets, and luminescence recovery. Consequently, a low detection limit of 0.0085 ng/mL was achieved with a wide detection range of 0.01–100 ng/mL. Moreover, the ability of the sensor to detect TC was confirmed in actual food samples and compared with the traditional ELISA with satisfactory results (p > 0.05).
研究领域:
食品安全检测
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分析化学
·
生物传感
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）