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.
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Zihao Su,Zhihao Guo,Haoyu Xie,Meizhen Qu,Gongchang Peng,Hao Wang
Li-rich Mn-based cathode materials (LLOs) are often faced with problems such as low initial Coulombic efficiency (ICE), limited rate performance, voltage decay, and structural instability. Addressing these problems with a single approach is challenging. To overcome these limitations, we developed an LLO with surface functionalization using a simple fabrication method. This two-step process involved a liquid-stage NaBF4 treatment followed by an in situ chemical reaction during sintering. This reaction led to the creation of oxygen vacancies (OV), spinel structures, and doping with Na at the Li site, B at the tetrahedral interstitial spaces of O in both the transition-metal (TM) layer and Li layers as well as the octahedral interstices in the TM layer, and F at the O site. We have carried out a thorough study and employed density functional theory calculations to reveal the hidden mechanisms. The treatment not only increases the electrical conductivity but also changes the oxygen charge environment and inhibits lattice oxygen activity. Surprisingly, the B–O bond is so strong that it prevents the migration of TM within the tetrahedral interstitial spaces of O in both the TM and Li layers, hence stabilizing its structure. This bonding interaction strengthens the transition of the TM 3d and O 2p states to lower energy levels, thus causing an increase in the redox potentials. Hence, a rise in the operating voltage occurs. Of special importance, this therapy dramatically increases the ICE to 90.29% and keeps a specified capacity of 203.3 mAh/g after 100 cycles at 1C, which is an excellent capacity retention of 89.94%. This study introduces ideas and methods to tackle the challenges associated with LLOs in batteries. It also provides compelling evidence for the development of high-energy-density Li-ion batteries.
✓ 已验证
DOI
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.
✓ 已验证
DOI
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.
✓ 已验证
DOI
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.
✓ 已验证
产品关联
DOI
PubMed
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.
✓ 已验证
产品关联
DOI
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.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Jingran Li,Longyan Cui,Chen Wang,Xuetao Liang,Mengying Wang,Han Wang,Qi Yang,Zhilin Yang
A three-dimensional particle electrode was established by integrating MoS 2 with nitrogen-doped Fe Mn biochar (MoS 2 /NFMB-1.0), enabling efficient electrochemical oxidation of tetracycline (TCH) in aqueous environments. Under optimized conditions, the MoS 2 /NFMB-1.0 achieved a TCH removal efficiency of 96.60%, substantially outperforming the two-dimensional electrode system. After five successive cycles, the degradation efficiency remained at 89.65%. The MoS 2 /NFMB-1.0 also promoted stronger mineralization, with a TOC removal of 74.31%, outperforming NFMB (65.21%), MoS 2 (38.43%). Reactive oxygen species (ROS) analysis revealed that the reaction was primarily driven by 1 O 2 (39.37%), accompanied by O 2 ·- (31.73%) and ·OH (28.90%). The incorporation of MoS 2 facilitated the Fe/Mn redox cycle and ensured continuous ROS generation throughout the reaction. The 3D/MoS 2 /NFMB-1.0 system maintained strong reactivity across a broad pH range from 3 to 11 and remained effective toward several representative antibiotics. Liquid chromatography-mass spectrometry (LC-MS) further clarified the transformation pathways of TCH, while ecotoxicity prediction confirmed that the toxicity of intermediates progressively declined as the reaction proceeded. These results highlight the significant potential of the MoS 2 /NFMB-1.0-based 3D particle-electrode system for future electrochemical water treatment.
✓ 已验证
DOI
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.
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Qida Peng,Huihui Su,Jiannan Qin,Hao Cheng,Mingfu Li,Pingjun Zhang,Liqun Jiang
2,5-Furandicarboxylic acid (FDCA) is a promising renewable alternative to petroleum-derived terephthalic acid for the production of bio-based polyesters. However, achieving efficient thermocatalytic oxidation of 5-hydroxymethylfurfural (HMF) to FDCA under mild conditions remains challenging. Herein, we report a lignin-derived nitrogen-doped carbon-supported Co–Mn dual single-atom catalyst (CoMn/LNC) prepared by a chelation-pyrolysis method, which achieves a 99.9% FDCA yield with a productivity of 1542.0 μmol FDCA ·g cat −1 ·h −1 at 65 °C using air as the oxidant. Physicochemical characterizations indicate that an asymmetric CoN 3 –MnN 3 electronic configuration in CoMn/LNC serves as the key catalytic center, which lowers the reaction activation energy and promotes the formation of FDCA under mild condition. Combined density functional theory calculations and in situ DRIFTS reveal that the asymmetric coordination modulates the d-band center, enhances interfacial electron transfer, and promotes HMF adsorption and subsequent oxidation. Furthermore, the asymmetric configuration facilitates oxygen activation and shifts the rate-determining step from the oxidation of HMFCA to FFCA toward FDCA desorption. This work provides a feasible strategy for designing transition metal dual single-atom catalysts for HMF oxidation to FDCA.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Yuchen Jiang,Jiaru Yang,Linlin Dong,Xiaolian Liu,Lanlan Guo,Yingli Yang,Jianliang Cao,Yan Wang,Guodong Wang
Hydrogen sulfide (H 2 S), as a highly toxic gas, poses severe threats to human health when its concentration exceeds safety thresholds. Therefore, it is crucial to develop H 2 S sensors with high response, excellent selectivity and fast response characteristics. In this work, we successfully synthesized In 2 O 3 -based nanotubes through a synergistic strategy combining variable-valence metal ion doping (Ni, Mn) and oxygen plasma treatment, achieving ultra-sensitive H 2 S detection at a low operating temperature of 75°C. Remarkably, the oxygen plasma-treated Ni-doped In 2 O 3 nanotubes (denoted as Ni-In 2 O 3 -plasma) exhibited outstanding sensing performance to 5 H 2 S gas: An unprecedented response value of 6601.4, a low detection limit of 100 ppb and superior anti-interference selectivity. Moreover, in situ diffuse reflectance infrared Fourier transform spectra (DRIFTS) proves the possible products in the gas-sensing reactions. Mechanistic investigations through electron paramagnetic resonance (EPR) and X-ray photoelectron spectroscopy (XPS) revealed that the enhanced performance is mainly attributed to the two synergistic effects of abundant oxygen vacancies and high Ni 3 + /Ni 2⁺ ratio in the composite materials. This study provides an efficient and controllable optimization strategy for the development of high-performance metal oxide semiconductor (MOS)-based H 2 S sensors.
✓ 已验证
DOI
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.
✓ 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）