APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Pengzu Kou,Zhigui Zhang,Zhaoyang Dong,Runguo Zheng,Zhishuang Song,Zhiyuan Wang,Hongyu Sun,Yanguo Liu
Lithium-rich manganese-based cathode (LRM) is considered to be the most promising cathode materials for next-generation lithium-ion batteries due to its high energy density. However, the low initial coulombic efficiency and poor rate performance are severe problems in the commercialization of LRM. Herein, we use an ascorbic acid (VC) modulation strategy to create spinel-carbon composite coatings and dual defects (oxygen vacancies, stack faults) on the surface of LRM. The composite surface coating and defects play a synergistic role in inhibiting interfacial side reactions, enhancing structural stability, and improving electrical conductivity as well as lithium-ion diffusion kinetics. As a result, the modified LRMs exhibit a specific capacity of 251.7mAh/g with an improved initial coulombic efficiency (ICE) of 82.3 % (pristine 72.9 %), enhanced rate capability (135 mAh/g at 5C), and long-term cyclability of 90 % retention after 200 cycles compared with the pristine (78 % retention after 200 cycles). The performance improvement of the modified LRMs is attributable to the composite coating and the dual defects, which ensure the LRM with a more stable structure (smaller volume change of 2.4 % compared with the original sample of 3.65 %). This strategy provides an efficient and environmentally friendly idea of surface modification for boosting the electrochemical performance.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Zhigui Zhang,Pengzu Kou,Yu Chen,Runguo Zheng,Zhiyuan Wang,Hongyu Sun,Yanguo Liu,Dan Wang
Li-rich manganese-based oxide (LRMO) is considered one of the most promising cathode materials for next-generation lithium-ion batteries due to its high energy density. However, many issues need to be addressed before its large-scale commercialization, including significant voltage decay and capacity fading. Herein, a Sn 4+ /Na + co-doping induced integrated defect structure (oxygen vacancies, stacking faults, and surface spinel phase) strategy is proposed to suppress the voltage decay and enhance the cycling performance of LRMO. The integrated surface defect structures have significantly favorable effects on the LRMO, where the oxygen vacancies remove surface labile oxygen and suppress surface oxygen release, the induced stacking faults alleviate the stress accumulation during cycling, the surface spinel phase promotes the Li + diffusion and prevents the outward migration of cations, and the co-doped Sn 4+ /Na + stabilize the layered structure. As a result, the modified sample Na 2 SnO 3 -1 % (NSO-1) achieves excellent cycling performance (capacity of 207 mAh/g and capacity retention of 96.71 % after 100 cycles at 0.5C) and a smaller voltage decay (less than 1.5 mV per cycle) compared with the unmodified LRMO. This work provides a new valuable strategy to suppress capacity fading and voltage decay of LRMO through dual-element substitution induced surface defect engineering.
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高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2019
·
IF 2.931
Jie Zhao,Zhefeng Fan
Melamine (MA)-passivated Mn-doped ZnS quantum dots (QDs) were synthesized by a hydrothermal method . The MA-passivated QDs can form a charge-transfer complex with picric acid (PA) at 80 °C, thereby quenching the phosphorescence of the QDs. A sensitive method for detecting PA was established based on this principle of phosphorescence quenching . When the PA concentration ranged from 2.0 to 180 ng mL −1 , the concentration was linearly related to the quenching intensity of the QDs, with a detection limit of 1.4 ng mL −1 . When applied to detect PA in environmental water samples, the proposed method showed superior analytical performance compared with other PA analysis methods. Furthermore, we verified the static quenching mechanism by density functional theory . MA on the surface of QDs and PA formed a stable structure with a binding energy of 12.43 eV.
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高影响因子
DYES AND PIGMENTS
·
2025
·
IF 4.2
Ying Wang,Bai-gang An,Lei Guan
5,5'-(diazene-1,2-diyl)bis(2-hydroxybenzoic acid) (H 2 L ) is used as a ligand precursor for a high-performance metal-organic framework (MOF)-based fluorescent probe, due to its dye characteristic group. The hydrothermal reaction of H 2 L and 4, 4ʹ-bipyridine (4,4ʹ-bipy) with Mn(II) salt led to a MOF Mn 3 ( L ) 4 (4,4ʹ-bipy) 2 (H 2 O) 2 ·Mn(4,4ʹ-bipy) 2 (H 2 O) 2 ·4H 2 O (MOF- 1 ). MOF- 1 features a 3D net with 1D square channels (12.50 Å × 15.36 Å), where L 2− ligands link trinuclear Mn clusters via bis-bridging and bis-monodentate carboxylate groups. MOF- 1 has good chemical stability across a wide pH range and strong blue luminescence. It enables quantitative detection of Fe 3+ , MnO 4 − , dehydroacetic acid sodium salt (SDH), and hydrocortisone (HC) via fluorescence turn-off effect, and Pb 2+ , tartaric acid (TA), and ascorbic acid (AA) through fluorescence turn-on effect, with high selectivity, good reusability, and low limits of detection (LODs). The sensing of Fe 3+ and MnO 4 − involves the competitive absorption (CA) and the resonance energy transfer (RET) mechanisms. The sensing of Fe 3+ also relies on the weak interactions with uncoordinated O sites in carboxylate groups. The detection of Pb 2+ primarily relies on its weak interactions with benzene moieties of L 2− ligands. Orbital energy theoretical calculations reveal that the fluorescence changes of MOF- 1 for SDH, HC, TA, and AA mainly stem from photoinduced electron transfer (PET). The CA process also plays an important role for SDH detection. The detection of water pollutants in real water samples (tap, spring, and Hunhe River) and of HC and AA in 100-fold diluted real sweat is achieved with corresponding recoveries of 98.00–103.70 %, 100.1 %, and 104.10 %. MOF- 1 fabricated into test strips can rapidly detect HC and AA in sweat. These results highlight the potential of MOF- 1 as a dual-signal sensor for detecting water pollutants and food additives, and for sensing specific sweat biomarkers to evaluate exposure to these substances.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Wenjuan Luo,Xiunan Cai,Zhongqiu Luo,Chaochao Lai,Qian Long,Xue Yang,Limin Ning,Pingyan Wang,Xiang Zhang,Xin Fu,Xintao Zhou
Developing efficient and cost-effective processes for removing highly toxic As(III) from water is critical for environmental restoration. Herein, an amorphous Fe–Mn composite (A-CSM) rich in oxygen vacancies was synthesized via a one-pot process. Acid etching of a pretreated copper slag product created the chemical conditions that simultaneously enabled the in situ anchoring of MnO x clusters and induced a crystalline-to-amorphous transformation. The resulting strong Fe–O–Mn interfacial coupling drives interfacial electron redistribution, which upshifts the d-band center and thereby endows the material with unique capabilities for O 2 activation and arsenic adsorption. Leveraging abundant oxygen vacancies within the amorphous structure, A-CSM efficiently activates O 2 into •O 2 − radicals to drive spontaneous As(III) oxidation to As(V), while exposed unsaturated sites in amorphous FeO x domains provide rapid adsorption sites for As(V). Consequently, A‑CSM exhibits a broad pH range (3–9), rapid adsorption kinetics (achieving complete removal of 5 mg L −1 As(III) within 30 min, which is 24.7 times faster than its crystalline counterpart, CSM), the q max calculated by Langmuir model is 84 mg g −1 , and good reusability over five consecutive cycles. Mechanistic studies confirmed that the synergy between the acid etching‑induced amorphous structure and oxygen vacancies significantly reduces the O 2 adsorption energy while it upshifts the d‑band center. This effect lowers the energy barrier for As(III) oxidation/adsorption by approximately 48.9%, and substantially enhances •O 2 − generation. Adsorption primarily involves complexation, electrostatic interactions, and hydrogen bonding, which is consistent with a heterogeneous multilayer process as described by the Freundlich isotherm.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2026
·
IF 3.9
Xuechun Li,Ze Zhang,Yang Xu,Rongxin Xia,Yuxiang Mao,Jun Cheng
For improving the activity of low-cost non-noble metal catalysts for the oxygen evolution reaction (OER) in acidic water electrolysis, a strategy was proposed to construct atomic Mn–O–Co asymmetric units within Co3O4 to form a directional built-in electric field. Mn-doped Co3O4 catalysts (MnxCo3–xO4) were synthesized via a hydrothermal-calcination method. The computational results indicated that Mn selectively occupied the octahedral Co site, forming a directional electron transfer pathway from Mn to Co, which effectively modulated the electronic structure of both Co and O. In situ Raman spectroscopy proved that the Mn–O–Co structure accelerated the efficient conversion of oxygen-containing intermediates. DFT calculations indicated that the Mn–O–Co directional built-in electric field facilitated H2O polarization via enhancing hydrogen bonding and, by optimizing the *OOH adsorption structure, lowered the OER rate-determining step barrier by 0.05 eV. The asymmetric Mn–O–Co coordination structure lowered the p-band center of the O atom by ∼0.1 eV atom, which passivated lattice-O to improve lattice stability. XPS revealed that the Mn0.6Co2.4O4 material had the maximum built-in potential. The electrochemical testing indicated that it exhibited an overpotential of only 243 mV at a current density of 10 mA cm–2 and maintained stability for over 80 h.
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高影响因子
Journal of Energy Storage
·
2026
·
IF 9.8
Wei Zhao,Shao-Hua Luo,Qi Sun,Rui Huang,Shengxue Yan,Lixiong Qian
Mn-based layered oxides have become competitive cathode materials for sodium-ion batteries (SIBs) due to their high energy density, cost-effectiveness, and potential for large-scale production. However, these materials often suffer from irreversible redox reactions, significant phase transitions, and the formation of microcracks, leading to substantial internal stress and subsequent degradation of their electrochemical performance. This study presents a high-entropy engineering strategy for P2-type manganese-based layered oxide cathodes, utilizing solid-state sintering to fabricate a Ni/Co-free high-entropy layered oxide, P2-Na 0.67 Mn 0.6 Cu 0.2 Li 0.075 Mg 0.025 Ti 0.025 Al 0.025 Sn 0.025 Zr 0.025 O 2 (high-entropy-doped layered oxides, HEO). It was found that the high configurational entropy significantly stabilized the layered framework and MnO 6 octahedral local structures, suppressing detrimental phase transitions during high-voltage cycling (>4.0 V) and enabling highly reversible cation/anion redox reactions. Benefiting from the high-entropy stabilization effect, complex atomic structure, and multi-element composition, these factors collectively improved the material's performance and stability. The HEO exhibits a capacity of 160.5 mAh g −1 at 0.1C within a wide voltage window of 2–4.5 V, demonstrating excellent cycling stability (with a capacity retention of 93.1 % after 100 cycles at 0.5C) and outstanding rate capability (94.8 mAh g −1 at 5C). Thus, this study expands the application of high-entropy layered materials, offering new insights for the design of high-stability sodium-ion battery cathodes.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2026
·
IF 2.6
Meng Gao,Zhichao Wang,Jincheng Liu,Xianming Xu,Guangjian Liao,Yongjun Zhang,Guanghui Zhao,Yulong Wang,Guochuan Yin
Short- to middle-length aliphatic acids have significant applications in high quality lubricant synthesis. The present work introduces a Lewis acid (LA) improved aerobic oxidation of short- to middle-length aliphatic aldehydes to the corresponding acids by the Mn(acac)2 catalyst with high efficiency. It was found that adding a modest LA such as Ca(OTf)2 could substantially improve Mn(acac)2-catalyzed aldehyde oxidations to the corresponding acids with yields up to 97%. Quenching experiments with 1,4-benzoquinone indicated that the superoxide radical plays a crucial role in catalysis. The trapping experiments with methyl p-tolyl sulfide disclosed that the content of peroxide and peracid was very limited in the reaction mixtures, and monitoring the temperature and pressure of the oxidation also showed that the reaction proceeded smoothly without obvious temperature and pressure changes, highlighting the promising advantages of this Mn(acac)2/Ca(OTf)2 catalysis in its practical applications for the middle-length aliphatic acid production from the corresponding aldehydes.
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高影响因子
INORGANIC CHEMISTRY
·
2026
·Vol. 65
·期 32
·18789-18799
·
IF 4.6
Liu Jia,Yang Xin,Liu Ziqing,Yu Long,Li Xin,Wen Zhiqing,Li Zhizai,Zhang Qiangsheng,Wang Suhua
Zero-dimensional
organic–inorganic metal halides (OIMHs)
have attracted considerable attention for optoelectronic applications
due to their exceptional luminescent properties. However, their practical
utilization is severely hindered by poor moisture and thermal stability,
especially in the case of manganese-based compounds, which tend to
degrade rapidly under humid conditions. To address this challenge,
we propose a polyaromatic molecular engineering strategy. By incorporating
bulky hydrophobic triazine-derived cations (TNZ-2 and TNZ-3), we successfully
synthesized two zero-dimensional Mn 2+ -based halides, (TNZ-2) 2 MnBr 4 and (TNZ-3) 2 MnBr 4 ,
featuring isolated [MnBr 4 ] 2– tetrahedra.
Notably, (TNZ-3) 2 MnBr 4 exhibits significantly
enhanced stability under high-humidity conditions (70% relative humidity
for 30 days) or even upon immersion in water, and achieves efficient
green emission with a photoluminescence quantum yield of 33.11%, benefiting
from the strong quantum confinement effect of its zero-dimensional
structure. Furthermore, flexible (TNZ-3) 2 MnBr 4 @PMMA composite films were fabricated and demonstrated to function
effectively in X-ray imaging, highlighting their potential in flexible
optoelectronic devices. This work provides a viable molecular design
route toward stable and highly luminescent OIMH materials.
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2026
·Vol. 18
·期 32
·43897-43906
·
IF 7.8
Li Ling-Yun,Zhu Zhi-Jie,Shen Ming-Yuan,Wu Tao,Li Wen-Cui
Mn-rich P2-type oxides offer high capacity via Mn redox, yet their commercial viability is stalled by Jahn−Teller distortions and structural instability. To overcome these hurdles, a pillaring strategy is employed to anchor the layered framework, effectively suppressing lattice strain and ensuring long-term cycling stability. Here, we regulate the coordination chemistry of a multielement co-doped P2 framework by coupling Ca/Mg/Ni/Ti substitution with controlled Li + occupation in the Na layer and systematically tune the composition as Na 0.8 Li 0.2 Ca 0.025 Mg 0.05 Ni 0.1 Mn 0.75 Ti 0.05 O 2 (NMNMT-20Li). The optimized NMNMT-20Li activates the reversible anionic redox above 4.0 V and delivers the highest reversible capacity of 120 mAh g −1 . In situ XRD evidences a solid-solution-like evolution without a phase transition and an ultra-low unit-cell volume change of ∼0.9% within 2.0−4.3 V. In situ distribution of relaxation times (DRT) reveals highly reversible charge-transfer and cathode−electrolyte interphase resistances. Density functional theory (DFT) calculation identifies interlayer Li as a “pillar” that smooths electrostatic potential between layers and lowers Na + migration barriers, while excessive Li induces transport blocking. Furthermore, the NMNMT-20Li || HC full cell exhibits a high initial energy density of 241.3 Wh kg −1 and retains 97.71% capacity after 200 cycles, demonstrating its strong practical promise.
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DOI
PubMed
高影响因子
ACS Omega
·
2026
·
IF 5.2
Yulin Sun,Yiwei Zhang,Yong He,Wubin Weng,Yanqun Zhu,Peixi Liu,Zhihua Wang
Mn-based catalysts usually exhibit considerable potential for enhancing the catalytic ozonation of volatile organic compounds (VOCs) at a lower temperature. In this study, bimetallic oxides M-Mn (M = Cr, Cu, Co) were supported on HZSM-5 zeolites to degrade dimethyl carbonate (DMC, chemical formula C3H6O3), a typical VOC emitted during the productive process of lithium batteries, with Mn/ZSM-5 for comparison. The Cr-doped catalyst CrMn/ZSM-5 could achieve 92% DMC conversion with 91% CO2 selectivity (O3/DMC = 6, T = 120 °C), showing an excellent catalytic performance among the prepared catalysts. The exceptionally low-temperature activity of CrMn/ZSM-5 was attributed to the synergistic effect of its large surface area, sufficient oxygen vacancies, and suitable acidity and reducibility, which collectively enhanced the level of O3 activation and accelerated DMC degradation. Furthermore, the catalyst demonstrated desirable stability and resistance to varying concentrations of water vapor. To elucidate the reaction pathway, in situ DRIFTS was employed to track the evolution of intermediate species during the adsorption and catalytic ozonation of DMC. With a further study of DFT calculation, the reaction mechanism of DMC catalytic ozonation on CrMn/ZSM-5 catalysts was put forward.
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PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 3
·122891
·
IF 7.5
Yuankun Liu,Yuanqi Cao,Gangyi Sun,Zhiwei Zhou,Xing Li,Zhonglin Chen
Fluoxetine (FLX), a widely used antidepressant, has been increasingly detected in aquatic environments due to its high chemical stability and resistance to biodegradation, posing potential ecological risks. In this study, sludge was used as a precursor to synthesize a Fe–Mn bimetallic nitrogen-doped biochar (FeMn/NBC), enabling the resource utilization of solid waste, which was further applied for peroxydisulfate (PDS) activation to achieve efficient degradation and defluorination of FLX. The superior catalytic performance originated from the synergistic coupling between the N-doped carbon framework and Fe–Mn bimetallic active sites. Nitrogen doping enhanced adsorption and PDS activation, while the bimetallic configuration further improved radical generation efficiency, electron transfer, and catalyst stability. Under optimal conditions (FLX = 10 mg/L, PDS = 2 mM, FeMn/NBC-4 = 0.4 g/L), complete removal of FLX was achieved within 60 min. The system exhibited stable performance over a wide pH range, in the presence of coexisting anions, and in real water matrices, with low metal leaching. Quenching experiments indicated that SO₄•⁻ and •OH were the dominant reactive species. The redox cycling of Fe(II)/Fe(III) and Mn(II)/Mn(III) facilitated continuous PDS activation, while the nitrogen-doped carbon framework enhanced electron transfer. DFT calculations combined with LC–MS analysis revealed that SO₄•⁻ first oxidized FLX via electron transfer, followed by •OH weakening the stability of the C–F bond through electrophilic addition and inducing its cleavage. Toxicity evaluation indicated that the degradation intermediates exhibited reduced ecological risk. These findings provide new insights into the degradation and defluorination mechanisms of fluorinated pharmaceuticals.
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高影响因子
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