JOURNAL OF COORDINATION CHEMISTRY
·
2021
·
IF 1.751
Le Guo,Yan-Peng Gao,Yan-Hua Lv,Li Wang,Yu Han,Fei Chang
We report the synthesis, crystal structures, and magnetic properties of a series of two-dimensional (2-D) and three-dimensional (3-D) coordination polymers (CPs). A solvothermal reaction of manganese metal salts with 4,4′-oxydibenzoic acid (H2oba), 4,4′-methylenebis(oxy) dibenzoic acid (H2mba), 4,4′-(propane-1,3-diylbis (oxy))dibenzoic acid (H2pba) or 1,4-bis (1H-imidazol-1-yl)-butane (bib) gives five new non-interpenetrating CPs, [Mn2(oba)2(CH3OH)(H2O)] (1), [Mn6(oba)6(bib)(DMF)2(H2O)4] · (DMF)2(CH3OH) (2), [Mn4(mba)4(bib)(CH3OH)] (3), [Mn7(pba)7 (bib)(H2O)4] · (H2O)3(DMA)(CH3OH)0.5 (4), and [Mn7(pba)7(H2O)6](DMA)3 (5). The X-ray crystal structural analyses revealed that 1, 4, and 5 are 2-D layers, whereas 2 and 3 are 3-D frameworks with 1-D Mn-carboxylate chains. In 1, 2, 4, and 5, the 1-D Mn-carboxylate chains are formed by flexible carboxylate ligands and Mn ions; these were then linked by organic ligands in different directions, leading to the formation of 2-D and 3-D frameworks. Furthermore, IR, PXRD, elemental analysis, TGA, and magnetic properties have been investigated.
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高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Suxing Xue,Huan Zhang,Huan He,Yachao Jin,Li Song,Mingdao Zhang
Due to the exceptional specific capacity, high energy density, and low cost, Li-rich manganese-based cathode materials (LRMCs) have emerged as promising candidates for next-generation lithium-ion batteries. However, their practical applications are hindered by relatively low initial Coulombic efficiency (ICE), continuous voltage fading during cycling, and poor capacity retention. In this study, Polyvinylpyrrolidone (PVP) and melamine are employed to treat the material surface, generating oxygen vacancies and forming a protective nitrogen-doped carbon layer. The presence of oxygen vacancies not only enhances Li + diffusion kinetics but also plays a critical role in suppressing voltage decay by activating stable cationic redox and minimizing irreversible oxygen release, which is key to the enhanced ICE. Additionally, the N-doped carbon coating establishes efficient electron conduction networks, facilitating efficient charge transfer. The modified materials exhibit an initial discharge capacity of 301.65 mAh g −1 at 0.1C (vs. 268.13 mAh g −1 for the pure Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 (LMNCO)), with an ICE of 87.88 % (pristine 77.46 %). After 200 cycles, the capacity retention reaches 85.17 % (compared to 45.16 % for the pure materials), and the voltage decay decreases from 0.72 V to 0.51 V. This study provides an important exploration for overcoming the challenges in the development of high-performance Li-rich manganese-based cathode materials.
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Analytical Methods
·
2025
·
IF 2.6
Chuntong Liu,Haiyan Qi,Jiayu Zhang,Jun Li,Tao Jing,Qiuying Li,Lixin Qiu,Xiaochen Zhu
The construction of a ratiometric fluorescent sensor based on nitrogen-doped carbon dots (NS-CDs) and fluorescein was reported to detect Mn(VII) and captopril. The detection mechanism of Mn(VII) and captopril were based on inner filter effect (IFE) and redox reaction, respectively. The sensor showed good linearities in the detection range of 0.12-100 μM for Mn(VII) and 0.52-300 μM for captopril, with limits of detection (LODs) of 0.12 μM and 0.52 μM, respectively. Furthermore, a smartphone-based platform for the detection of Mn(VII) and captopril was developed, based on the dual-signal response of color and fluorescence intensity. The system displayed linear signal changes with increasing Mn(VII) and captopril concentration in the ranges of 0.32-100 μM and 0.52-300 μM, with LODs of 0.32 μM and 0.52 μM, respectively. Finally, the ratiometric sensor was validated for the determination of Mn(VII) and captopril in herb and captopril tablet samples, demonstrating its broad applicability and versatility as a portable, sensitive, and specific detector for Mn(VII) and captopril in various sample types. Overall, our ratiometric fluorescent sensor has potential as a portable, on-site detector for Mn(VII) and captopril analysis.
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PubMed
高影响因子
Nano Energy
·
2018
·
IF 13.12
Guorong Chen,Juan An,Yiming Meng,Changzhou Yuan,Bryan Matthews,Fei Dou,Liyi Shi,Yongfeng Zhou,Pingan Song,Gang Wu,Dengsong Zhang
Cobalt-free Li and Mn-rich layered cathode materials are promising for next generation lithium ion batteries due to their high specific capacity and low cost. However, these materials are facing serious issues, such as structural collapse due to volume shrinkage during Ni 2+ oxidation to Ni 4+ and oxygen vacancy generation over 4.5V. In this work, we report a strategy to address the issue of volume shrinkage caused by structural deformation via constructing a large-size rigid frame by simultaneously doping inactive and large radius atoms of Cd and S. This strategy significantly reduces the volume shrinkage when fully delithiated relative to the pristine material. The Cd- and S-doped cathode materials present a highly reversible structure, which were determined by using HAADF-STEM and in-situ XRD characterization. The doped Cd and S atoms act as supporting atoms and synergistically enlarge the layer spacing of crystalline from 0.455 to 0.483 nm. The in-situ XRD monitors the structural changes in real time during charging and discharging processes, further verifying structural stability during cycling. Due to the unique structural properites, an initial capacity of 268.5 mAh g −1 at 0.1 C along with a good rate capacity of 153.8 mAh g −1 at 5 C were achieved. Also, a capacity of 243.4 mAh g-1 at 0.1 C over 80 cycles indicate good cyclic stability of the co-doped Li- and Mn-rich layered cathode.
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JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Yixuan Zhang,Guoqiang Liu,Chang Su,Guangyin Liu,Hongda Sun,Danlei Qiao,Lei Wen
This work focuses on the improvement on the electrochemical performances of Fe–Mn based oxides as cathode for sodium ion batteries by doping Cu and F elements. The synthesized doped-compounds exhibit extremely excellent electrochemical performance. For instance, it's initial discharge capacity can reach 195.6 mAh g −1 at a current density of 10 mA g −1 . Meanwhile, after 200 cycles at 200 mA g −1 , it still remains a capacity of 124.1 mAh g −1 , 87.8% of the initial capacity of 141.3 mAh g −1 . More significantly, it can deliver a high capacity of 106.4 mAh g −1 at a high current density of 1000 mA g −1 . It is found that F/Cu co-substitution obviously improve the discharge capacity and cycle stability of Fe–Mn based oxide especially at higher current densities. Doping Cu and F elements has influence on the structure and morphology of the material, which results in the improvement of charge-discharge characteristics.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Jun Xiao,Mengmeng Wang,Yaru Wang,Xunxun Li,Jiaqin He,Yunchong Liu,Qingfeng Xu,Hua Li,Najun Li,Dongyun Chen,Jianmei Lu
Catalytic oxidation is one of the most promising methods to remove toluene; manganese-cerium catalysts have high activity in the catalytic oxidation of toluene. Herein, nano-sized ZSM-5 was synthesized using a simple hydrothermal method, and catalysts with different Mn and Ce contents were prepared via alcohol-induced redox precipitation at room temperature. In addition, zeolite provides sufficient surface area for the dispersion of manganese cerium catalysts and plays a role in concentration and enrichment in the catalytic conversion of toluene. Based on the experimental characterization results, the 20Ce/M1Z1 catalyst exhibited the best catalytic activity, achieving 90% toluene conversion at 215 °C. Moreover, the catalyst still has excellent catalytic activity in humid environments. This work provides a new strategy to expose more active sites and enhance toluene adsorption, which provides a reference for the development of more efficient catalysts in the future.
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高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Zhen Ruan,Junzhen Di,Ting Zhang
Acid mine drainage (AMD) contains high levels of harmful heavy metal (HM) ions. To mitigate its harmful effects, this study developed novel Algae-Fungal Immobilized Bioparticles (AFIBs) using Chlorella ellipsoidea HLDA2 and Aspergillus tubingensis HLDF3. By optimizing the culture conditions of the algal-fungal system, the immobilization efficiency of the mycelial pellets formed at pH 3 reached 94.40 %. It was revealed that AFIBs effectively removed Mn(II) and Zn(II) through the mechanisms of electrostatic adsorption, ion exchange, chelation, and chemical precipitation. AFIBs outperformed both single algae and fungal systems within the Mn(II) and Zn(II) concentration range of 1 to 30 mg/L tested. The water quality index ( WQI ) of the treated AMD with AFIBs was 82.82, indicating suitability for aquatic life. In the real AMD treatment, the AFIBs decreased Mn(II) and Zn(II) concentrations to 1.832 mg/L and 1.663 mg/L, respectively, achieving removal rates of 92.97 % and 87.40 %. They also raised the pH to 8.59, adhering to the coal industry pollutant discharge standards (GB20426–2006). Thus, the novel AFIBs developed offer a sustainable solution for AMD remediation.
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高影响因子
Journal of Physical Chemistry Letters
·
2024
·
IF 4.8
Yanchang Wang,Yao Xiao,Jiangnan Huang,Chunxiao Zhang,Kentaro Yamamoto,Yoshiharu Uchimoto,Weifeng Wei,Hongshuai Hou,Datong Zhang,Xiaobo Ji
For cathode materials of sodium-ion batteries, O3-type Ni/Fe/Mn-based (Na-NFM) layered oxides have garnered extensive attention because of high economic viability, environmental friendliness, and the potential for high energy density. Among them, Fe-rich compositions exhibit higher initial charge capacity and lower bill-of-material costs, while they fade rapidly and exhibit low initial coulombic efficiency, hindering their commercialization prospects. In this work, we investigate the failure of Fe-rich Na-NFM materials through X-ray absorption spectroscopy methods. The results reveal a combined failure mechanism that encompasses not only the conventional theory of Fe migration but also an abnormal Ni-redox deterioration, which has not yet been reported. More factors related to the failure of Fe-rich Na-NFM layered oxides are discussed in detail. These findings are expected to inspire targeted research efforts toward Fe-rich Na-NFM materials, thereby accelerating the practical application of sodium-ion batteries.
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高影响因子
JOURNAL OF POWER SOURCES
·
2023
·
IF 9.2
Zhongshuai Zhang,Yuqing Liu,Zixi Liu,Hailin Li,Yaoliang Huang,Weijian Liu,Dingshan Ruan,Xin Cai,Xiaoyuan Yu
O3-type Fe/Mn-based layered oxides are considered as the competitive cathode materials for sodium-ion batteries because of environmental friendly metal elements and low cost. However, a lower capacity, poor cycling stability and irreversible phase transitions hinder their commercial application. Herein, the Cu-doped O3 biphasic Na[Mn 0.6 Fe 0.4 ] (1- x ) Cu x O 2 (NFMCu- x ) layered oxides are successfully synthesized by high temperature calcination using Fe/Mn-based Prussian blue analogues as precursor. The results indicate that the different stoichiometric of Cu 2+ substitution in P2 NaMn 0.6 Fe 0.4 O 2 can cause the transformation of P2 phase to O3 monophase or O3 biphase. The NFMCu- x samples exhibit O3 monophase at x = 0.1, 0.15, while O3 biphase coexists in the compound at x = 0.2, 0.25, and 0.3. Benefiting from the synergetic effect of Cu-doping and O3 biphasic structure, the optimized O3 biphasic NaMn 0.48 Fe 0.32 Cu 0.2 O 2 exhibits a high Na + diffusion coefficient and an excellent sodium storage performance with a high discharge specific capacity of 103.76 mAh g −1 at 24 mA g −1 and good capacity retention of 82.9% after 100 cycles. Moreover, Cu-doped O3 biphasic NaMn 0.48 Fe 0.32 Cu 0.2 O 2 features an excellent air stability. Thus, this work proposes a strategy in development of O3 Fe/Mn-based layered oxide as high-performance cathode materials for sodium-ion batteries.
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高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yangeng Peng,Xianzhao Zhang,Fengmao Liu,Dawei Zhen,Yanyan Jiao,Qingrong Peng
This work developed a novel Mn/N co-doped biochar (Mn/N-BC) using 1-methyl-3-methylimidazolium tetrachloromanganate ([Emim] 2 [MnCl 4 ]) as a modifier. The modification process increased the specific surface area (SSA) by 2.4 times and pore volume by 1.8 times, while simultaneously doping the biochar matrix with Mn and N, which provided additional adsorption sites and enhanced chemical reactivity. Adsorption experiments were conducted following pseudo-second-order kinetics and Langmuir isotherms, revealing a monolayer adsorption behavior. The maximum adsorption capacity of Mn/N-BC-3 for tetracycline (TC) was 2.8 times higher than that of unmodified biochar. Thermodynamic analysis indicated that the adsorption process was both spontaneous and endothermic. The adsorption mechanism involved multiple interactions, including pore-filling, hydrogen bonding, and π-π interactions. Density functional theory (DFT) calculations revealed that Mn and N doping significantly reduced the energy gap and increased adsorption energy, enabling stronger electronic interactions and enhancing the material’s affinity for TC. Regeneration experiments demonstrated that Mn/N-BC-3 retained 86 % of its initial TC adsorption capacity after five cycles, and leaching tests showed minimal Mn leaching. The material also exhibited excellent performance in real water, with a minimal reduction in TC adsorption in tap and river water. Furthermore, Mn/N-BC-3 showed effective adsorption of five different antibiotics. This study demonstrates that Mn/N-BC holds significant potential as an effective adsorbent for TC removal and demonstrates the versatility of metal ionic liquids in biochar modification. The findings provide valuable insights into developing advanced adsorbents for environmental remediation.
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高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2017
·Vol. 409
·期 10
·2675-2683
·
IF 3.431
Gao Ni,Ling Bo,Gao Zhongling,Wang Lun,Chen Hongqi
An electrochemiluminescence resonance energy transfer (ECL-RET) system that detects prostate-specific antigen (PSA) was created. Near-infrared (NIR)-emitting NaYF 4 :Yb,Tm/Mn upconverting nanoparticles (UCNPs) are used as donors, and gold nanorods (GNRs) are used as acceptors. The ECL was enhanced nearly threefold by Mn 2+ doping, with an emission peak appearing at an NIR wavelength of 808 nm. Anti-PSA 1 (Ab 1 ) was bound to the surfaces of UCNPs after being modified with poly(acrylic acid) (PAA). As for acceptors, cetyltrimethylammonium bromide (CTAB)-capped GNRs were treated with 11-mercaptoundecanoic acid (MUDA) and then conjugated with Anti-PSA 2 (Ab 2 ). When PSA was added, donors and acceptors were brought in close proximity through specific interactions of antibodies and antigens, resulting in high quenching efficiency levels. Under optimal conditions, the linear range of detection was 3.75–938 pg/mL for PSA ( R = 0.999), with a detection limit as low as 3.16 pg/mL. This method can be applied to detect PSA in human serums with satisfactory results.
An electrochemiluminescence resonance energy transfer system was developed for determination of prostate-specific antigen using near-infrared-emitting NaYF 4 :Yb,Tm/Mn upconverting nanoparticles as donors and gold nanorods as acceptors.
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PubMed
高影响因子
Advanced Sustainable Systems
·
2025
·
IF 6.1
Yu Ren,Youhao Zhang,Zizheng Zhou,Yi Fang,Yuzhuo Wang,Yingjie Li
Ca(OH) 2 can be used in CO 2 uptake from the flue gas in fossil-fired power plants. Compared with indirect method where Ca(OH) 2 is first converted into CaO and then uptakes CO 2 , direct CO 2 uptake by Ca(OH) 2 occurs at lower temperature, leading to slighter sintering. However, the direct CO 2 uptake capacity of Ca(OH) 2 should be further enhanced. In this study, Ca(OH) 2 is doped with Mn to improve its direct CO 2 uptake capacity in carbonation-calcination-hydration cycles. The cyclic tests are conducted in a triple fixed-bed reactor. The mechanism of CO 2 adsorbed on Mn-modified Ca(OH) 2 is determined by density functional theory calculations. In the first cycle, Mn-modified sorbents acquire highest carbonation conversion at 400 °C, which is 40 °C lower than Ca(OH) 2 . The modified Ca(OH) 2 with Ca/Mn molar ratio of 100:0.75 exhibits the best performance, and its carbonation conversions reach 0.76 and 0.59 in the 1st and 20th cycles, respectively, which are 28% and 18% higher than those of Ca(OH) 2 . Furthermore, carbonation conversion of this Mn-modified Ca(OH) 2 decreases by within 1.00% from cycle 5 to 20. Mn addition boots oxygen vacancy, increases the surface area and pore volume, and reduces the energy barrier for carbonation of Ca(OH) 2 . Mn-modified Ca(OH) 2 as CO 2 sorbent appears promising.
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