JOURNAL OF POWER SOURCES
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2024
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IF 8.1
Wei Liu,Xin Geng,Hailong Wang,Jing Chen,Chenyang Wang,Nian Zhang,Ahmed M. Hashem,Wei Chu,Xin He
Lithium (Li) - and manganese (Mn)-rich oxides ( x Li 2 MnO 3 ·(1− x ) Li TM O 2 , TM = Ni, Co, Mn, etc.) are one of the most promising cathode materials because of their high theorical capacity, which is contributed by the redox of both transition metal cations and oxygen anion. However, anionic redox leads to transition-metal migration and release of lattice oxygen, which further triggers voltage decay and capacity fade. Here, we report a dual-doping and multiphase co-existence strategy to tackle the structure degradation of Li- and Mn-rich materials and enhance electrochemical kinetics. La–Ti dual cations doping strength the TM -O bonds and improve cycling stability, and the inducement of LaMnO 3+ δ (LaMO) phase provides higher conductivity. As a result, the unique architecture presents a favourable rate performance, improved capacity retention, and suppressed voltage decay. After 200 cycles at 1C (250 mA g −1 ), the La–Ti dual cations doped Li-and Mn-rich material shows 24 % higher capacity retention and 52 % lower voltage decay compared to the non-doped material. This study demonstrates the potential of dual transition-metal ion doping combined with doping-induced perovskite phase to enhance the performance of Li- and Mn-rich materials.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
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IF 20.2
Bin Zhang,Shuangqing Xia,Zhenyi Wang,Wenqian Li,Boda Li,Haochen Zhang,Yanjun Xin,Kai Wu,Jun Ma,Xu He
Permanganate [Mn(VII)] needs to be activated to improve its reactivity towards refractory organic contaminants in practice. Herein, visible light (VL) and graphitic carbon nitride (g-C 3 N 4 ) were introduced to enhance the activation of Mn(VII) for the first time. Sulfamethoxazole (SMX) can be degraded effectively by VL/Mn(VII)/g-C 3 N 4 system in neutral and alkaline environments. Different from conventional Mn(VII) activation and photocatalytic processes, the performance of VL/Mn(VII)/g-C 3 N 4 system in various real water samples was superior than Milli-Q water. Mn(V) was found to be the dominant active species responsible for SMX degradation. Photo-induced electron (e cb – ) of g-C 3 N 4 under VL irradiation was proved to be the initiator of Mn(VII) activation. Density functional theory calculations revealed the strong affinity of g-C 3 N 4 for Mn(VII), which can resist the interference of water substrates on the Mn(VII) activation process by photo-induced e cb – . This work deepens the understanding of reactive manganese intermediates in the Mn(VII) activation system.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Wenhao Gu,Jinxian Feng,Xingshuai Lv,Weng Fai Ip,Hui Pan
Photocatalytic CO 2 reduction has been considered as an efficient way for the carbon nuetrality. In this work, a series of (Cu, Mn) co-incorporated metal-orgnaic frameworks (MOFs) (NH 2 -MIL-125(Ti) (NML)) with different Cu 2+ /Ti 4+ and Mn 2+ /Ti 4+ molar ratios are systematically investigated to improve the efficiency for photocatalytic CO 2 reduction. The optimized sample (1 M−5C−−NML) shows a highest yield of HCOOH (116.74 μmol . g −1. h −1 ) (3.71 times higher than that of NML), and a superior apparent quantum efficiency (AQE) (6.74 % at 405 nm). The improved performance is attributed to the formed oxygen vacancy and intermediate energy level as introduced by the co-incorporation, which facilitate the charge separation and enhance the visible-light-harvesting of NML. It shows that the density of oxygen vacancies increases with the increasing amount of Cu, resulting in enhanced charge separation. However, the increasing amount of Mn leads to the short-range Mn-Mn interaction, the concentration quenching effect as well as the inhibited photocatalytic performance. This work shows that the co-incorporated MOFs can be used as an advanced photocatalyst.
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ACS Applied Energy Materials
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2025
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IF 5.5
Dongheng Zhao,Qian Ma,Ying Sun,Lingyu Li,Huayushuo Zhang,Bolong Li,Zhiqiang Liu,Xiaomei Jiang
Zero-dimensional organic zinc halides have garnered significant attention as efficient and eco-friendly photoluminescent materials. However, its luminance efficiency, which is typically attributed to self-trapped excitons formed within zinc halide tetrahedra, often encounters a serious thermal quenching problem. This issue significantly limits its application in the field of solid-state lighting. Intriguingly, the incorporation of tetra-coordinated Mn2+ ions into these organic zinc halides can effectively mitigate unnecessary electron interactions and nonradiative energy transfer between Mn–Mn, achieving significantly improved photoluminescence quantum yield (PLQY) in the alloyed materials. In this work, a series of zero-dimensional Mn2+-alloyed 4-benzylpiperidinum zinc chloride hybrids were designed and synthesized by a solvent evaporation method. It is noteworthy that the pure zinc chloride shows a negligible visible emission at 510 nm, whereas (C12H12N)2MnxZn1–xCl4 (x = 0.25, 0.5, 0.75, 1) emits visible light ranging from green to yellow at room temperature. Incorporating Mn has led to a remarkable enhancement in PLQY, increasing from a mere 4.02% in the organic zinc halide to an impressive 94.45% in the (C12H12N)2Mn0.75Zn0.25Cl4. The white LED was successfully fabricated by employing the optimal sample as a single-component yellow phosphor coated on 450 nm chip. The correlated color temperature was determined to be 4770 K with a color rendering index as high as 91. It was also demonstrated with good luminous stability under different working currents. This research provides a straightforward approach for developing eco-friendly, cost-effective, and high-performance single-component yellow phosphors for white LED applications.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Shuangfu Gang,Yongxin Qian,Tianshun Xiong,You Li,Wang Li,Zheng Ma,Wenguang Zhang,Hui Long,Yingchao Wei,Xin Li,Qinghui Jiang,Yubo Luo,Junyou Yang
All-scale hierarchical defects induced by structural designing from unit cell to mesoscale play a significant role in oscillating and dissipating electromagnetic wave energy under external microwave radiation. To construct such all-scale hierarchical defects, hereby, high-entropy alloy nanoparticles coated by microscale carbon (HEA@C) with a core–shell structure were obtained by carbonizing Ni-Mn-Co-Cu-Al metal–organic. Thus, all-scale hierarchical defects were gained, including lattice distortion and nanotwins caused by the high entropy effect, vacancy and topological defects within carbon, and the heterojunction between high entropy nanoparticles and carbon. These all-scale hierarchical defects combined with the magnetic and conductive nature of HEA@C enable us to achieve a high electromagnetic wave absorption performance, with a reflection loss (RL min ) value of −52.36 dB and an effective absorption bandwidth (EAB) of 5.01 GHz. It implies that HEA@C should be an effective electromagnetic wave (EMW) absorber.
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JOURNAL OF MOLECULAR STRUCTURE
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2024
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IF 4
Jian-Wei Zhang,Ya Chen,Yong-Ya Zhang,Wei Wei
In this work, by utilizing an X-type tetracarboxylate ligand (1,2,4,5-tetrakis(4-carboxyphenyl)benzene, H 4 TCPB), a novel Mn-organic framework, namely, [(CH 3 CH 2 ) 2 NH 2 ] 2 [Mn(TCPB)(H 2 O) 2 ] ( SQNU-25 , SQNU = Shangqiu Normal University), was prepared under a DEF/HAc solm. Due to the structural advantage of SQNU-25 , the Ln 3+ ions (Eu 3+ and Gd 3+ ) have been successfully introduced into the framework by post-synthetic modification. The result of the energy levels of the H 4 TCPB ligand and Eu 3+ ion shows that the H 4 TCPB ligand as a chromophore can effectively sensitize Eu 3+ ions. Moreover, the Eu@SQNU-25 not only shows a typical Eu 3+ ion red emission but also exhibits good temperature sensing in the wide temperature range (80 to 300 K).
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ACS ES&T Water
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2025
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IF 4.3
Xinyue Zhang,Zhichao Yang,Hongchao Li,Bingcai Pan
Transition-metal oxide-mediated peroxide activation systems have been demonstrated to initiate selective degradation of pollutants, while the underlying mechanism remains unclear and sometimes controversial. In this study, we systematically explored the reactive species/pathways for pollutant degradation in the Mn oxide octahedron molecular sieve (OMS-2)-triggered peracetic acid (PAA) activation system. By separating PAA activation and pollutant oxidation processes using a sequential activation/oxidation system or galvanic oxidation system, we confirm that the OMS-2/PAA system follows the reactive metal species mechanism, where surface reactive Mn(IV) species, rather than Mn–PAA complexes, are primarily responsible for the nonradical oxidation of bisphenol A. OMS-2 shows varied peroxide-activating activities (i.e., catalase-like and peroxidase-like activities) toward different peroxides (i.e., H2O2, PAA, and persulfates), depending on the reactivity of surface reactive Mn(IV) species with those peroxides. In addition, the long-lived surface reactive Mn(IV) species exhibit excellent resistance to fluctuations in solution pH and interference from coexisting anions and natural organic matter. This study offers novel insights into the nonradical mechanism involved in Mn oxide-mediated peroxide activation processes.
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ACS ES&T Water
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2024
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IF 4.8
Jianwang Wu,Mei Lin,Zuliang Chen
Fenton oxidation is highly efficient for removing pollutants from wastewater. However, the low utilization efficiency of oxidants increases operating costs and limits their application in water treatment. To address these issues, this study designed a novel Fenton-like catalyst: zerovalent iron/amorphous manganese composites (ZVI-Mn). This catalyst can activate O2 in situ to generate H2O2 and simultaneously activate H2O2 to produce free radicals, achieving a 96.3% removal efficiency of enrofloxacin (ENR) from water. Radical quenching experiments showed that superoxide radicals (•O2–) (46%) play a dominant role in ENR removal, while hydroxyl radicals (•OH) (28.2%) and singlet oxygen (1O2) (25.8%) also participate. Liquid chromatography–mass spectrometry (LC–MS), density functional theory (DFT) calculations, and toxicity estimations demonstrated effective ENR degradation and significant toxicity reduction of the intermediates, primarily through decarboxylation and ring opening. Additionally, ZVI-Mn achieved a 90.1% removal efficiency of ENR in aquaculture wastewater. This study proposes a new Fenton oxidation technique based on the in situ generation of H2O2, providing a meaningful research basis for environmentally friendly water treatment technologies.
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FUEL
·
2024
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IF 6.7
Liangyong Chen,Rui Mao
Developing robust catalytic oxygen carriers (COC) to make Chemical-looping Oxidation Coupling of Methane (CL-OCM) economical and practical remains a big challenge. This work modified the Mn-based catalysts for co-feed OCM and tried to adapt them into CL-OCM process. COCs were specially designed with high faction of Mn-oxides to improve oxygen storage, with supports (pelletized from SiO 2 , MgO and TiO 2 ) of stable and porous structure to improve cyclic stability and to tune lattice oxygen reactivity, and with Na + dopant to improve conversion and selectivity. Among the COCs, Mn20Na2Si and Mn20Si (20 wt% Mn 2 O 3 supported on SiO 2 with/without 2.0 wt% Na 2 CO 3 dopants) exhibited excellent methane coupling activity. The averaged CH 4 conversion, C 2 selectivity and yield of Mn20Na2Si upon multiple redox cycles were 21.4 %, 79.6 % and 17.03 %, respectively. It showed improvements in C 2 selectivity and yield by 187 % and 163 % compared to Mn20Si. This work tried to establish the relationships between CL-OCM performance and lattice oxygen behaviors, since COC transports lattice oxygen to promote methane coupling as it performs as a catalyst during CL-OCM reduction. It is found that high C 2 -selectivity and CH 4 conversion are benefited from the constant oxygen transporting rate. Na + dopant improved the concentration of surface lattice oxygens, tuned the spatial arrangement of metal oxides, and stabilized the surface lattice oxygen in cyclic reactions. Due to Na + -doping, carbon deposition on Mn20Na2Si was avoided, and catalyst deactivation as well. Finally, a mechanism was developed to reveal how lattice oxygen species and their releasing rates affected surface reaction network, CH 4 conversion, C 2 selectivity and cyclic stability.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Shu-Xiang Xiang,Jin-Peng Wang,Su Gao,Zhan-Kuo Guo,Hui-Lin Jiang,Bao-Xia Dong,Yun-Lei Teng
The CH 4 yield over dual functional materials (DFMs) remains low and requires further improvement. In this work, we first examined the influence of Mn on the performance of the Ni-CaO/γ-Al 2 O 3 DFM for CO 2 capture and in situ methanation. Our results showed that the MnNi-DFM-3 (MnNi-CaO/γ-Al 2 O 3 DFM) exhibited the best performance at 350 °C, with a CH 4 yield of 0.56 mmol/g which is 4 times higher than that of the Ni-DFM-1 (Ni-CaO/γ-Al 2 O 3 DFM) (0.14 mmol/g). Nanoscale characterization revealed that highly scattered Mn 3 O 4 acted as a barrier preventing the agglomeration of Ni-based catalysts. Furthermore, our density functional theory (DFT) analysis demonstrated that the introduction of Mn enhanced the activation of CO 2 , promoted the dissociation of H 2 and intermediates, and reduced the activation energy needed to produce carboxylic acid intermediates on the Ni catalyst. The prepared MnNi-DFM is promising to be a cheap efficient material for CO 2 capture and in situ methanation. This work opens up a new pathway for enhancing the performance of DFMs using inexpensive transition metals.
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LANGMUIR
·
2025
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IF 3.9
Huining Lan,Jingge Niu,Tianshu Luo,Louqun Wang,Xiaohong Hou
Biological antioxidants play a crucial role in numerous disease-related biological processes, which has led to significant interest in their identification. In this research, a colorimetric sensor array was created. It uses MIL-53 (Fe, Mn) nanozymes to simultaneously detect multiple antioxidants. The bimetallic nanozymes, MIL-53(Fe, Mn), were synthesized by using a solvent-thermal method. This framework demonstrated notable oxidase-like catalytic ability. In particular, it facilitates the conversion of colorless TMB to a blue compound under different pH conditions. When antioxidants were introduced into the reaction system, the sensor array exhibited cross-reactivity, resulting in distinct color signals. Linear discriminant analysis (LDA) was successfully utilized to precisely identify the different concentrations of cysteine (CYS), glutathione (GSH), dopamine (DA), and ascorbic acid (AA) and their combinations. This method enabled accurate determination of the amounts of these substances both individually and in mixtures, providing a reliable way to analyze their concentrations in an experimental context. Furthermore, the prepared sensor array combined with the smartphone successfully distinguished the target antioxidants in the serum. The proposed sensing method would be expected to have practical applications in diagnosis.
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PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Yi Ma,Luming Li,Yong Zhang,Ning Jian,Huiyan Pan,Jie Deng,Junshan Li
Electrochemical upgrading methanol into value-added formate at the anode in alkaline media enables the boosting production of hydrogen fuel at the cathode with saved energy. To achieve such a cost-effective and efficient electrocatalytic process, herein this work presents a Mn-doped nickel iron layered double hydroxides supported on nickel foam, derived from a simple hydrothermal synthesis. This developed electrocatalyst could act as an efficient bifunctional electrocatalyst for methanol-to-formate with a high faradaic efficiency of nearly 100 %, and for hydrogen evolution reaction, at an external potential of 1.5 V versus reversible hydrogen electrode. Additionally, a current density of 131.1 mA cm −2 with a decay of merely 12.2 % over 120 h continuous long-term testing was generated in co-electrocatalysis of water/methanol solution. Further density functional theoretical calculations were used to unravel the methanol-to-formate reaction mechanism arising from the doping of Fe and/or Mn. This work offers a good example of co-electrocatalysis to produce formate and green hydrogen fuel using a bifunctional electrocatalyst.
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