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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高影响因子
ACS Applied Materials & Interfaces
·
2026
·Vol. 18
·期 32
·43897-43906
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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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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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JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Yukun Pan,Yuhu Li,Lei Hu,Yudong Yang,Jiacheng Guo,Sijie Yang
To address the rapid capacity degradation of spinel LiMn 2 O 4 caused by Mn dissolution and Jahn-Teller distortion, this work develops a surface-engineered LiMn 2 O 4 material (LMO@NCM) through a urea-assisted homogeneous precipitation and gradient sintering strategy. The resultant gradient Ni-Co co-doped LiNi x Co y Mn 2-x-y O 4 coating synergistically combines bulk-phase doping and surface modification benefits. Systematic investigations reveal that LMO@NCM1 % delivers enhanced cycling stability with an initial discharge capacity of 119.74 mA h g −1 and 92.25 % capacity retention after 200 cycles at 1C (148 mA h g −1 ) under 25 °C, significantly outperforming pristine LMO (116.48 mA h g −1 , 84.47 % retention).Characterization results revealed that the Ni-Co gradient co-doping improved the electrode's interfacial kinetics, suppressed manganese dissolution, and mitigated side reactions between the electrolyte and the electrode, thereby significantly enhancing the battery's rate capability and cycling stability.
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EES Catalysis
·
2026
·
IF 9.8
Mingge Zhi,Jinan Niu,Chaoyao Yao,Ruixuan Zhang,Shunle Zhou,Sonehra Anjum,Fangfang Liu,Yihan Ling,Guiqing Liu,Guohua Fan,Arianit A. Reka,Farid Akhtar,Peizhong Feng,Hermenegildo Garcia
Developing efficient and durable oxygen evolution reaction (OER) electrodes for alkaline water electrolysis requires not only catalytically active components but also strong interfacial integration between the catalyst layer and the conductive substrate. Herein, we report a one-step hydrothermal route for constructing a six-metal NiZnCuCoMnFe LDH-based heterostructure directly on copper foam, denoted as M6-LDH/CF. Rather than forming an ideal homogeneous multimetal LDH phase, the synthesis produces an integrated architecture consisting of a six-metal LDH nanosheet framework, segregated Co/Mn-containing oxide or oxyhydroxide surface phases, and a reconstructed Cu/Cu₂O/CuO interfacial region derived from the substrate. Structural analyses indicate that differences in hydrolysis, oxidation, and precipitation behavior among the metal species, together with substrate oxidation under hydrothermal conditions, govern this non-ideal growth pathway. The optimized M6-LDH/CF electrode exhibits overpotentials of 181, 392, and 502 mV at 10, 50, and 100 mA cm⁻², respectively, and maintains stable operation at 50 mA cm⁻² for 100 h. Post-OER XPS further reveals pronounced surface-state evolution, including Cu oxidation, Zn leaching, and the formation of more metal–oxygen–metal coordination environments, indicating that M6-LDH/CF functions as a precatalyst architecture that evolves toward a more oxidized working state during operation. These results suggest that controlled non-ideal in situ growth can be used constructively to fabricate integrated multimetal OER electrodes with favorable activity and operational stability in alkaline media.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 11
·5420-5430
·
IF 3.3
Qi Guo,Jihong Xu,Rui Tang,Yulin Min,Zhenhu Hu,Penghui Shi
In the degradation process of organic pollutants, compared with the free radical pathway, the non-radical pathway shows the advantages of mild oxidation ability, strong anti-interference, and adaptation to different pH values. In this study, a manganese–nitrogen co-doped porous carbon (Mn–N@C-1) with high nitrogen content was prepared to improve the contribution rate of non-radical pathways to the degradation process of organic pollutants. The high performance of Mn–N@C-1 is attributed to the formation of Mn–Nx sites between Pyridine N and Mn, which can effectively oxidize organic pollutants in water (phenol, bisphenol A, 2,4-dichlorophenol). In addition, the catalyst exhibits high catalytic activity over a wide pH range (pH = 3–9) and has good immunity to inorganic anions. Moreover, the Mn–Nx site and graphitic-N are considered to be the generation sites of singlet oxygen, and the role of metastable Mn–N@C-1/PMS* complexes in the electron transfer process is explored. Overall, this study explores the crucial role of non-radical pathways in the degradation of organic pollutants by carbon-based materials.
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Reaction Chemistry & Engineering
·
2023
·Vol. 8
·期 5
·1185-1191
·
IF 3.9
Lingjiang Kou,Yong Wang,Jiajia Song,Taotao Ai,Koji Kajiyoshi,Panya Wattanapaphawong,Jintao Wang
Developing a structurally controlled electrode has attracted widespread attention in recent years, which is ascribed to the morphology of cathode materials having an influence on the electrochemical performance. Herein, we present Mn-decorated (NH4)2V10O25·8H2O (NVOH) materials with a cauliflower-like, tremella-like, and purslane-like structure via a solvothermal approach. When examined as a cathode material for aqueous zinc-ion batteries (ZIBs), all three materials with different morphologies exhibited superior electrochemical performances. Especially for materials with a tremella-like structure, benefiting from the uniqueness of the porosity structure of the tremella, the active material has a larger contact area with the electrolyte, which increases the active sites and diffusion coefficient of Zn2+. This tremella-like NVOH delivered a high rate capability of 159 mA h g−1 at 500 mA g−1 together with long-term stability (85% retention after 500 cycles at 500 mA g−1). This study has great significance for the exploitation of cathode electrodes of aqueous ZIBs with high reversible specific capacity and long cycle life and provides a promising candidate cathode for practical rechargeable aqueous ZIBs.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 21
·10455-10462
·
IF 3.3
Mengting Chen,Qifeng Zhong,Jiao Ma,Zhiyang Zhang,Yingxin Liu,Zuojun Wei,Shuguang Deng
Hydrogenation of levulinic acid (LA) to γ-valerolactone (GVL) is a key reaction in the conversion of biomass to renewable fuels and value-added chemicals. Developing low-cost, highly efficient and reusable non-noble metal-based heterogeneous catalysts is vital but challenging. Herein, non-noble Ni–Mn/SiO2 catalysts with a low Ni loading (2.0 wt%) were designed for the selective hydrogenation of LA to GVL. The results showed that the optimal Ni–Mn/SiO2 (Ni/Mn = 2) catalyst with well-dispersed and small-sized metal nanoparticles (2.21 nm) and moderate acid sites exhibited excellent activity and selectivity and achieved a 100% yield of GVL in a 1,4-dioxane solvent under mild reaction conditions (e.g., 0.8 mol% Ni, 140 °C and 2.0 MPa H2) for 5.5 h and a 100% GVL yield at 180 °C for 2 h with a turnover frequency (TOF) of 190.2 h−1, which is better than most non-noble metal catalysts reported. Furthermore, the catalyst exhibited excellent reusability and could be recycled at least five times with only slight activity loss. This work provides new insights for the rational design of highly efficient and stable non-noble metal catalysts for the conversion of LA to GVL.
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INORGANICA CHIMICA ACTA
·
2023
·
IF 2.8
Ruiqin Huang,Wei Li,Xiaoling Luo,Zheng Liu,Guo-Cheng Han,Runzhi Wei
2,5-bis(trifluoromethyl)terephthalic acid (H 2 L 1 ) as the main ligand and 1,10′-phenanthroline (L 2 ) as the co-ligand were reacted with manganese chloride tetrahydrate (MnCl 2 ·4H 2 O), nickel sulfate hexahydrate (NiSO 4 ·6H 2 O) and cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) by solvothermal reaction to give the manganese complex [Mn 2 (L 1 ) 2 (L 2 ) 2 ] n ( 1 ), the nickel complex {[Ni 3 (L 1 ) 3 (L 2 ) 2 (H 2 O) 4 ]·2DMF} n ( 2 ) and the cobalt complex {[Co 2 (L 1 ) 2 (DMF) 2 ]·H 2 O} n ( 3 ). The structures were characterized and their properties studied by means of single-crystal X-ray diffraction, infrared spectroscopy, elemental analysis, ultraviolet spectroscopy, fluorescence spectroscopy, thermogravimetric analysis. The single-crystal structure analysis showed that the complexes 1 – 3 are infinitely extended three-dimensional network-like structures of space groups P 1 - , P 1 - , P 2 1 / n , respectively. The results of fluorescence analysis and thermogravimetric analysis showed that complexes 1 – 3 have good thermal stability and fluorescence properties, respectively. Complex 3 can also maintain good thermal stability at 230 °C, and the maximum fluorescence emission wavelength is 370 nm.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2022
·
IF 7.305
Yun Da,Jialei Zhou
The ability of calcium-based composites to simultaneously improve optical absorption and accelerate decomposition kinetics represents a major endeavor direction in the direct solar-driven thermochemical energy storage system. Doping strategy has been macroscopically proved to be an effective way in boosting optical absorption properties and calcination kinetics, but the underlying microscopic mechanisms are still unclear. This paper aims to reveal the mechanisms of optical absorption enhancement and accelerated decomposition kinetics for Mn-doped CaCO 3 through both experiments and density function theory (DFT). In the experiment, the optical absorption of Mn-doped CaCO 3 was much higher than that of pure CaCO 3 . The sample CaCO 3 –7Mn displayed satisfied optical absorption and fabulous cycling stability. The optical absorption reached 74% and energy storage density only decreased 2.6% after 20 cycles. Meanwhile, the decomposition reaction rate equations of pure CaCO 3 and Mn-doped CaCO 3 were obtained via non-isothermal kinetic analysis . The results indicated that doping Mn could accelerate decomposition kinetics of CaCO 3 by reducing the apparent activation energy . In the DFT calculation, the complex refractive index of Mn-doped CaCO 3 was lower in real part (refractive index) and higher in imaginary part (extinction coefficient) within the wavelength range from 300 to 2500 nm compared with pure CaCO 3 , which was closely related to the electron cloud distribution in the calcite crystal structure. Moreover, Mn-doped CaCO 3 has lower transition state energy barrier and dissociation energy than pure CaCO 3 . The calculation results revealed the mechanisms of doping Mn in CaCO 3 to enhance the light absorption and accelerate the decomposition kinetics from the microscopic perspective at atomic level. This work contributes to understanding the physical mechanisms of doping elements on boosting the performance of calcium-based composites at the molecular level.
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JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Chengyun Zhou,Yuntao Liang,Wu Xia,Eydhah Almatrafi,Biao Song,Ziwei Wang,Yuxi Zeng,Yang Yang,Yanan Shang,Chaohai Wang,Guangming Zeng
Highly efficient single atom catalysts are critical to substantially promote for peroxymonosulfate (PMS) activation to organic pollutant degradation , but it remains a challenge at present. Herein, single atom Mn anchored on N-doped porous carbon (SA-Mn-NSC) was synthesized by ball milling of Mn-doped carbon nitride and spirulina biochar to dominantly activate PMS . The precursor of carbon nitride and spirulina possessed a strong coordinating capability for Mn(II), facilitating the formation of highly dispersed nitrogen-coordinated Mn sites (Mn-N 4 ). The SA-Mn-NSC catalyst exhibited high activity and stability in the heterogeneous activation of PMS to degrade a wide range of pollutants within 10 min, showing an outstanding degradation rate constant of 0.31 min −1 in enrofloxacin (ENR) degradation. The high surface density of Mn-N 4 sites and abundant interconnected meso–macro pores were highly favorable for activating PMS to produce 1 O 2 and high-valent manganese (Mn(IV)) for pollutant degradation. This work offers a new pathway of using a low-cost and easily accessible single-atom catalysts (SACs) and could inspire more catalytic oxidation strategies.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yuan Qin,Zihao Ou,Chuanlan Xu,Jianping Liu,Qi Lan,Rong Jin,Xinru Xu,Chaozhong Guo,Honglin Li,Yujun Si
Carbon-supported single Mn atoms catalysts are seen as one of the most promising substitutes for the conventional Pt-based catalysts owing to weaker Fenton reaction , higher stability and lower cost. We here report a confined thermal-erosion strategy for converting Mn-based MOF materials (Mn-ZIF-8) into a pore-rich graphene structure (4 ∼ 5 layers) with highly accessible defect-hosted Mn-N 3 sites and ultrahigh specific surface area (1419 m 2 g −1 ) via high-temperature full-gasification of graphitic C 3 N 4 , which can serve as an efficient single Mn atoms catalyst for oxygen reduction reaction (ORR). The catalyst shows superior ORR catalytic activity with a half-wave potential of 0.863 V ( vs. RHE), high cycling stability and four-electron selectivity for the ORR. Theoretical calculations indicate that the promoted ORR activity of the Mn-SAC catalyst may be mostly attributed to the defective Mn-N 3 sites with a lower free energy barrier and a higher intrinsic activity compared to in-plane Mn-N 4 sites. The Zn-air battery assembled with this catalyst represents a maximum power density (226 mW cm −2 ) and superior energy density of 857 Wh kg Zn -1 , far exceeding the air battery performance using the Pt/C catalyst. Our findings can provide new design methods and in-depth insights for defect-hosted active single-metal-atoms ORR catalysts. W h
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危险品化学品经营许可证（带存储）