ACTA PHYSICO-CHIMICA SINICA
·
2017
·Vol. 33
·期 8
·1672-1680
·
IF 0.767
LIAO Pei-Yi,ZHANG Chen,ZHANG Li-Jun,YANG Yan-Zhang,ZHONG Liang-Shu,GUO Xiao-Ya,WANG Hui,SUN Yu-Han
A series of Cu/Co/Mn/Al catalysts derived from hydrotalcite precursors with different Cu/Co molar ratios (0, 0.1, 0.5, 1.0, and 2.0) were prepared and used for the synthesis of higher alcohols from syngas. N2 physical adsorption desorption, inductively coupled plasma atomic
emission spectrometry (ICP-AES), X-ray diffraction (XRD), scanning electron microscopy (SEM), hydrogen temperature-programmed reduction (H2-TPR), thermogravimetry (TG), and high-resolution transmission electron microscopy (HRTEM) techniques were employed to investigate the physical
and chemical properties of the Cu/Co/Mn/Al catalysts. The results show that the optimum Cu content can increase specific surface area, improve reducibility, and form regular layered structure to provide more uniform distribution of active sites, thereby enhancing catalytic activity and alcohol
selectivity. When the Cu/Co molar ratio was 0.5, the yield of alcohol and the alcohol selectivity reached the maximum values of 0.071 g·g-1·h-1 and 35.9%, respectively.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Fanlin Kong,Yi liu,Shiyu Cao,Huimin Chen,Yanwei Fan,Junhua Wang,Jincheng Yao,Aimin Chang
In this study, single-phase high-entropy ceramics (HECs) with the composition (Co,Mn,Fe,Zn,Ni,Mg,Al,Cr) 3 O 4 were successfully synthesized using five different types of spinel raw materials. The resulting material demonstrates excellent performance in the negative temperature coefficient (NTC) thermistor field. X-ray diffraction (XRD) analysis confirmed the structure as a cubic spinel with a single Fd-3m space group. The electron microscope image reveals the growth of ceramic grains with increasing sintering temperature, with a uniform distribution of all elements. After 1800 h of accelerated aging at 150 °C, the Δ R / R 0 value was only 0.41 %, indicating the ceramic's exceptional structural stability. X-ray photoelectron spectroscopy(XPS) analysis reveals that electrical conductivity are mainly governed by electron hopping between Mn 3+ and Mn 4+ ions in the octahedral sublattice sites. Impedance spectroscopy further shows that grain boundary resistance is the dominant contributor to the total resistance. This study provides new insights into the synthesis of single-phase HECs materials and proposes strategies to enhance material stability for future applications.
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ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Yong-Qi Ye,Si-Heng Liu,Wen-Qi Lv,Ding-Rong Deng,Gui-Fang Li,Ye Zeng,Jia-Xi Song,Hai Huang,Shuang-Lin Cai,Yu-Han Yuan,Xiao-Hong Fan,Jian-Chun Weng,Qi-Hui Wu
Iron-based sulfides are promising anode materials for sodium-ion batteries (SIBs) due to high theoretical capacities, but their short cycle life—caused by volume expansion and polysulfide shuttle effect—limits wide-temperature applications. To solve this, a novel three-dimensional MFS@rGO composite anode was prepared via one-step solvothermal method followed by annealing sulfurization, composed of Mn-doped Fe 7 S 8 (MFS) embedded in nitrogen-doped reduced graphene oxide (N-doped rGO). Mn doping enlarges Fe 7 S 8 lattice spacing, reducing Na⁺ diffusion resistance to boost ionic conductivity and Na storage. DFT calculations confirm Mn increases Fermi-level electronic density, lowers Na⁺ migration energy barrier, and accelerates ion transport. N-doped rGO builds a stable conductive network and synergizes with Mn to suppress shuttle effect and alleviate volume expansion, enhancing structural stability. Benefiting from this synergy, MFS@rGO performs well at −40–60 °C: 282.71 mAh g −1 after cycling at −40 °C, 310 mAh g −1 over 500 cycles at −20 °C, 450 mAh g −1 over 1000 cycles (60 °C, 2 A g −1 ). At room temperature, it retains 407.09 mAh g −1 ; over 100 cycles (1 A g −1 ); even at 50 A g −1 , it maintains 206.14 mAh g −1 over 100,000 cycles with negligible degradation. It also works well in full cells, offering a strategy for high-performance SIBs under extreme conditions.
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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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ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19.9
Hongbo Liang,Mengfan Pei,Shuo Zhuo,Rui Xie,Hui Lin,Wenkai Song,Zirui Guo,Xigao Jian,Fangyuan Hu
The high activation barriers for sodium polysulfide conversion during the charge–discharge processes of room-temperature sodium–sulfur batteries lead to sluggish reaction kinetics, thereby resulting in limited practical specific capacities. This simultaneously triggers the shuttle effect, leading to a rapid decay in specific capacity. In this study, we propose a hierarchical (crystalline-atomic) catalytic strategy, where the hierarchical catalyst features both manganese oxide crystalline sites and Mn single-atom sites. The two catalytic sites selectively anchor the sulfur and metal moieties of sodium polysulfides, respectively, exerting a “tearing” effect that weakens the chemical bonds and lowers the activation energy, thereby accelerating the polysulfide conversion. The cathode material synthesized using this method retains a specific capacity of 309 mAh g −1 after 2000 cycles at a current density of 2C, indicating that hierarchical parallel catalysis can effectively mitigate the shuttle effect and accelerate the reaction kinetics. Therefore, this work demonstrates the practical potential of hierarchical parallel catalysis in metal-sulfur batteries and provides a new approach for catalyst design in this domain.
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JOURNAL OF HAZARDOUS MATERIALS
·
2026
·
IF 10.6
Fenghua Shen,Chaolong Liu,Jie Yu,Kaisong Xiang,Bangwei Bai,Xin Liang,Guangpeng Sun,Shide Li,Hui Liu
To address the issues of low activity and poor stability of manganese-based catalysts in the catalytic degradation of refractory volatile organic compounds such as chlorobenzene (CB), this study designed a sodium-doped Mn-Cu bimetallic catalyst supported on hydroxyl-rich pseudo-boehmite (PB), denoted as Na-CuMnO x /PB, depending on the route of “support hydroxylation, bimetallic synergy, and alkali metal modification”. The catalyst achieved highly efficient degradation of CB under room temperature with the non-thermal plasma assistance. The PB support significantly increased surface hydroxyl groups and acidity. MnO x /PB showed a degradation efficiency of 85.14 %, superior to the 73.98 % achieved by a conventional Al 2 O 3 -supported catalyst. Cu doping promoted the formation of a Mn-Cu synergistic structure, increasing the surface-adsorbed oxygen to 56.59 % and the Mn(IV)/Mn(III) ratio to 0.63, thereby improving the degradation efficiency to 92.02 %. However, chlorine deposition (Cl content: 3.91 %) caused rapid deactivation. After Na modification, the Na-CuMnO x /PB catalyst exhibited a further increased Mn(IV)/Mn(III) ratio of 0.79, enhanced weak basic and acidic sites. The abundant surface hydroxyl groups and alkaline sodium hydrolysis facilitated HCl generation, achieving an HCl selectivity of 40.95 % with surface chlorine deposition as low as 0.59 %, thereby enabling the catalyst to maintain a degradation efficiency of 95.95 % over 16 h. Mechanism studies revealed the crucial roles of acid-base sites, reactive oxygen species, and metal valence states in CB degradation. The bimetallic system promotes the redox cycling between Cu(II)/Cu(I) and Mn(IV)/Mn(III), enabling continuous regeneration of active species. This work provides new insights for designing highly active and chlorine-tolerant catalysts for low-temperature purification of chlorine-containing VOCs.
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Catalysts
·
2026
·Vol. 16
·期 2
·112
·
IF 4
Ping Lu,Yan Xie,Xin Zhou,Wei Lu,Qian Xu
The synthesis of Mn-TiO2/TiO2, together with its application as a photoanode for solar flow batteries (SFBs), is reported herein. Both the pure TiO2electrode and the Mn-TiO2/TiO2based composite electrode were prepared using the sol–gel spin-coating technique. The incorporation of a Mn-TiO2layer led to the enhancement of the built-in electric field within the composite photoanode. This enhancement not only improved the light-harvesting capability of the photoanode but also suppressed the recombination of charge carriers, consequently enhancing the photocatalytic efficiency. Furthermore, the optimal annealing temperature and the optimum TiO2loading were systematically controlled and optimized to maximize the photoelectric conversion efficiency of the composite photoanode. Ultimately, the optimized Mn-TiO2composite photoanode was integrated into a monolithic solar flow battery. The results demonstrate that the battery’s photocharging current density reaches 300 μA·cm−2. The photocharging current density was relatively increased by 150%.
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RSC Advances
·
2026
·Vol. 16
·期 23
·20895-20907
·
IF 6.1
Xiaolong Xu,Yuze Zhou,Junhao Chen,Lujing Fei,Min Qi
The treatment of malignant melanoma, an aggressive skin cancer with high recurrence and metastatic potential, often presents challenges due to systemic toxicity and multidrug resistance in current therapies. In this study, we develop a localized therapeutic platform by integrating methotrexate–manganese (MTX–Mn) coordination nanoparticles into a thermosensitive PLGA–PEG–PLGA (PPP) hydrogel to achieve sustained and site-specific drug delivery for melanoma treatment. MTX–Mn nanoparticles were synthesized through coordination-driven self-assembly and comprehensively characterized by FTIR, 1H NMR, TEM, EDS, and zeta potential analyses, confirming successful coordination and uniform nanoscale features. In vitro experiments demonstrated that MTX–Mn significantly inhibited melanoma cell proliferation and migration. Flow cytometry further revealed that MTX–Mn induced pronounced G0/G1 cell-cycle arrest and effectively promoted apoptosis, which was confirmed by TUNEL staining. Mechanistic investigations indicated that MTX–Mn triggered severe mitochondrial dysfunction, including ultrastructural damage, elevated mitochondrial ROS generation, and collapse of mitochondrial membrane potential (JC-1), suggesting a mitochondria-associated antitumor mechanism. In vivo, peritumoral administration of PPP/MTX–Mn markedly suppressed tumor growth in a melanoma-bearing mouse model, reduced the tumor burden, and significantly decreased Ki-67 expression. Histological evaluation of major organs by H&E staining revealed no obvious pathological abnormalities, supporting good in vivo biosafety. Overall, this MTX–Mn-loaded thermosensitive hydrogel provides a promising strategy for effective and safe localized melanoma therapy.
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BIORESOURCE TECHNOLOGY
·
2026
·
IF 8.2
Youn-Jun Lee,Chohee Yang,Deok Hyun Moon,Eilhann E. Kwon
CO 2 thermochemical treatment yielded MnO x -biochar and CO-rich syngas. • Micro- and mesopore development enhanced BPA adsorption by MnCCB (CO 2 ). • MnO x rich in Mn(IV) and Mn(III) promoted catalytic BPA oxidation. • Char gasification and oxygenate conversion increased yields of CO and H 2 . Adsorptive removal of aqueous organic pollutants is often limited by mass-transfer kinetics to the adsorbent surface. To address this constraint, integrated adsorption-oxidation processes have been widely explored as a strategic measure because they enable in situ degradation of adsorbent-bound organic pollutants, thereby regenerating active sites and prolonging removal performance. However, many such systems require energy inputs and chemical oxidants, which hinder practical implementation. Here, we evaluate MnO x -loaded corncob (CC) biochar produced under a CO 2 atmosphere (MnCCB (CO 2 )) as a bifunctional adsorption-oxidation material for bisphenol A (BPA) removal. Physicochemical characterization showed that CO 2 -assisted fabrication yielded MnO x with a higher oxidation state in MnCCB (CO 2 ) than that in the N 2 -derived analogue (MnCCB (N 2 )). MnCCB (CO 2 ) exhibited increased micro-/mesopore volume and a higher specific surface area. Consistent with these structural advantages, MnCCB (CO 2 ) achieved a BPA removal rate constant of 8.48 × 10 -2 min −1 , outperforming MnCCB (N 2 ) and pristine CC biochars produced under either N 2 or CO 2 . Beyond pollutant removal, Mn-catalyzed CO 2 mediated thermochemical treatment also enhanced syngas formation during MnCCB (CO 2 ) production. This improvement is attributed to selective catalytic reactions between bio-oil and CO 2 , during which CO 2 is converted to CO in the presence of MnO x . Overall, this work demonstrates the potential of CO 2 -assisted thermochemical treatment for the simultaneous production of functional biochar and syngas. Download: Download high-res image (121KB) Download: Download full-size image
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Journal of Water Process Engineering
·
2026
·
IF 6.7
Xiao Liu,Runze He,Jiachen Song,Xinyu Hou,Fei Wang
With the growing severity of environmental pollution, the treatment of organic wastewater and waste plastic bottles has become global concerns. This study explored the feasibility of synthesizing metal-organic composite catalysts using waste PET plastic by a microwave one-step synthesis process with only 4 h. Comprehensive characterizations confirmed that the bimetallic Cu/Mn-PET catalyst outperformed monometallic counterparts and pure BDC-derived catalysts, featuring a more regular polyhedral morphology, good crystallinity and excellent stability. XPS valence state analysis uncovered pronounced synergistic interactions between Cu and Mn. Notably, despite a relatively low specific surface area (11.75 m 2 /g), Cu/Mn-PET featured the highest active site density and exhibited minimal interfacial charge transfer resistance in electrochemical measurements. When combined with PMS-AOPs technology, Cu/Mn-PET achieved nearly 100% degradation efficiency for various pollutants (dyes, antibiotics, phenolic compounds) under optimized conditions, accompanied by substantial mineralization (TOC removal rates above 56.36%). Additionally, the Cu/Mn-PET catalyst also showed strong recyclability with low metal leaching concentrations, as well as good salt tolerance. Furthermore, it was proved that the catalytic mechanism of Cu/Mn-PET involved the combined action of free radical reactions and non-free radical reactions, but the non-free radical based 1 O 2 played a dominant role. Thus, a green and efficient PET microwave one-step conversion technology has been developed to prepare a bimetallic organic composite catalyst with high catalytic activity and stability successfully, which hold significant implications for environmental protection and resource utilization.
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ANALYTICA CHIMICA ACTA
·
2026
·
IF 6.1
Yi-Ting Chen,Xiao-Jun Dai,Xi- Qing Xu,Pei Liu,Wen-Ge Zhang,Wen-Rui Zhang,Shu-Xuan Li,Peng Wang,Chun-Hui Gong,Yi Yang
Background Iodide (I − ) serves as a key indicator for monitoring 131 I contamination in marine environments. However, rapid on-site detection remains challenging due to the short half-life of radionuclides and the complex nature of seawater. Traditional nanocatalysts exhibit limited catalytic activity under near-neutral conditions and poor selectivity in high-salinity environments. There is therefore an urgent need to develop a robust, instrument-free analytical platform that can meet on-site environmental monitoring requirements by combining high sensitivity with operational simplicity. Results In this study, Mn-modified MOF-808 (Mn/MOF-808) nanozymes were synthesised using a sustainable aqueous post-synthetic approach. The incorporation of Mn centers significantly altered the electronic structure of the MOF nodes, resulting in exceptional peroxidase-like activity across a wide pH range (3.5-8.0). We found that I − acts as a potent synergistic amplifier, greatly accelerating the catalytic oxidation of chromogenic substrates. The sensing system achieved an ultra-low limit of detection (LOD) of 0.63 nM for I − . To enable point-of-care testing (POCT), we developed a smartphone-integrated platform using a customised WeChat mini-program for digital image colorimetry. The test results showed no significant deviation from those obtained using the standard ICP-MS method. Significance This work presents a cost-effective ($0.104/test), rapid, and user-friendly approach for I − monitoring. The Mn/MOF-808 platform demonstrates superior anti-interference capability in various environmental water samples and simulated seawater (recoveries: 96.5%-103.2%). By bridging advanced nanozyme engineering with mobile digitization, this research offers a practical and scalable solution for real-time environmental monitoring and emergency diagnostics of radioactive contaminants, aligning with the principles of green analytical chemistry.
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ACS Applied Materials & Interfaces
·
2026
·
IF 7.8
Xiaoyu Gui,Weiliang Li,Wenbo Liu,Zhongyuan Pei,Zhiqiang Zhao,Canrong Cao,Guifa Long,Kai Wan,Zhiyong Fu,Zhenxing Liang
Despite the high specific capacity of P′2-NaxMnO2 (NMO), its practical application is severely hindered by rapid capacity decay caused by drastic structural evolution. Herein, a P′2-[Na0.57KxZn0.10-x]Mn0.90Ti0.10O2 (NKxZMTO) cathode featuring K+ and Zn2+ as pillar cations is developed to mitigate O2–-O2– electrostatic repulsion and suppress detrimental phase transition. Physicochemical characterization and theoretical calculations reveal that K+ and Zn2+ co-occupy the Nae site, acting as inert pillars in the Na layers. While NMO undergoes an abrupt and irreversible OP4-P′2-P″2 triphase transition, NK0.02ZMTO maintains a high fraction of P layers within the OP4 phase and exhibits a mild and reversible P′2-OP4 biphase transition. This stabilized interlayer evolution arises from the combined effects of K+ and Zn2+: K+ enlarges the Na layer spacing owing to its large ionic radius, while Zn2+ reduces the electron density on O2– through its high positive charge, thereby simultaneously mitigating O2–-O2– electrostatic repulsion in accordance with Coulomb’s law. Benefiting from this structural stabilization, NK0.02ZMTO delivers superior cyclability (99.2% capacity retention after 150 cycles at 100 mA g–1) and a high specific capacity of 180 mAh g–1 at 10 mA g–1. This work provides an innovative strategy for designing highly stable cathode materials.
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