Materials
·
2024
·Vol. 17
·期 6
·1417
·
IF 3.1
Chen Zheng,Xu Han,Fangfang Sun,Yue Zhang,Zihang Huang,Tianyi Ma
Aqueous supercapacitors have occupied a significant position among various types of stationary energy storage equipment, while their widespread application is hindered by the relatively low energy density. Herein, N/F co-doped carbon materials activated by manganese clusters (NCM) are constructed by the straightforward experimental routine. Benefiting from the elevated conductivity structure at the microscopic level, the optimized NCM-0.5 electrodes exhibited a remarkable specific capacitance of 653 F g−1at 0.4 A g−1and exceptional cycling stability (97.39% capacity retention even after 40,000 cycles at the scanning rate of 100 mV s−1) in a neutral 5 M LiCl electrolyte. Moreover, we assembled an asymmetric device pairing with a VOxanode (NCM-0.5//VOx), which delivered a durable life span of 95% capacity retention over 30,000 cycles and an impressive energy density of 77.9 Wh kg−1. This study provides inspiration for transition metal element doping engineering in high-energy storage equipment.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Shuangjie Xu,Chongqi Wang,Lianxu Ye,Ruixing Xu,Yu Wang,Kaifeng Li,Feng Chen,Yanda Ji,Jiyu Fan,Fengjiao Qian,Chao Yun,Lei Qiu,Weiwei Li,Hao Yang
Real-time monitoring of structural health status is very important for supersonic aircraft, since the long-term operation in harsh service environments, such as high temperatures, can cause potential damage. Structural health monitoring (SHM) based on lamb wave has been approved to be a critical technique for the reliable operation of supersonic aircraft , but is limited by the operating temperature of conventional piezoelectric sensors , which makes it difficult to meet the high-temperature monitoring requirements. The BiFeO 3 –BaTiO 3 ceramics exhibit excellent piezoelectric properties and high Curie temperature ( T c ), making them promising for high-temperature SHM of supersonic aircraft. Here, we fabricated a piezoelectric sensor using 0.67BiFeO 3 -0.33BaTiO 3 -0.25%molMnO 2 (BF33BTMN-025) ceramic, which exhibits a piezoelectric charge constant ( d 33 ) of 135 pC/N at room temperature and a T c of 448 °C. The BF33BTMN-025 ceramic sensor operates effectively at temperatures up to 200 °C and maintains stable damage monitoring sensitivity as well. Compared with Pb(Zr, Ti)O 3 (PZT), BaTiO 3 (BTO) and other piezoelectric sensors commonly used in SHM field, the BF33BTMN-025 ceramic sensor has a higher operating temperature and a comparable sensitivity. Our work demonstrates that the BF33BTMN-025 ceramic sensor can be employed as piezoelectric sensor for high-temperature SHM, which has a wide application potential in the field of real-time monitoring of supersonic aircraft.
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Energy Technology
·
2024
·
IF 3.6
Ning Li,Yue Dong,Bin Ma,Jiatong Zhang,Yanping Qiu,Yangqin Gao,Zhifeng Liu,Lei Ge
For green hydrogen, the exploitation of advanced electrocatalysts is crucial, and transition metal phosphides have great potential in water splitting due to their abundant reserves and optimized electronic structure. Herein, a synergistic approach involving Mn doping and phosphorization is applied to CoFe-layered double hydroxide nanoflowers to produce a series of bifunctional catalysts Mn-doped CoFeP (Mn-CoFeP). Electrochemical evaluations demonstrate that the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) performance of Mn(10%)-CoFeP both have notable improvement in 1 M KOH, with the overpotentials of only 160 and 239 mV to achieve current densities of 10 and 100 mA cm −2 , respectively. Comparative electrocatalytic analysis indicates that moderate Mn doping mainly contributes to improve the OER performance, while the phosphorization significantly enhances the HER activity, resulting in effective bifunctional catalysis. For overall water decomposition, a total hydrolysis electrolysis cell equipped with the Mn(10%)-CoFeP bifunctional catalyst requires only 1.64 V to reach a current density of 10 mA cm −2 . Furthermore, it performs stable operation for 10 h at a current density of 10 mA cm −2 with a current maintenance rate of 83.6%. This work offers new insights into preparing effective bifunctional electrocatalysts, advancing clean energy development.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Xiaojing Dong,Yangyang Wang,Jintao Wang,Yiqiang Sun,Bo Xu,Cuncheng Li,Lifeng Hang
In the field of research on renewable energy conversion and storage methods, the development of catalysts with excellent properties and outstanding stability for oxygen evolution reaction (OER) acting at various pH values has become a much-anticipated research focus. RuO 2 as a benchmark OER catalyst, its wide application has always been limited by slow reaction kinetics and limited persistence. In this paper, Mn-doped RuO 2 material was developed and the optimum doping ratio was identified for using as an OER electrocatalyst under general purpose pH media. Mn 0.1 Ru 0.9 O 2 exhibited a lower overpotential value of 224 mV in acidic environment with a Tafel slope value of 51.62 mV dec −1 . Moreover, in alkaline and neutral environments, overpotentials of 231 mV and 376 mV were required to obtain a current density of 10 mA cm −2 , respectively. In addition, through continuous stability testing over 24 h in alkaline, acidic and neutral solutions, it has been further demonstrated that the Mn-doped RuO 2 material exhibits extremely high stability. The advancements in this research offer crucial insight into the rational development of efficient and durable RuO 2 -based catalysts.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Hui Wan,Meng-Yuan Xie,Bo Li,Jian-Hang Nie,Tao Huang,Lei Li,Jing-Hui Shi,Ming-Hua Xian,Jia-Rong Huang,Wangyu Hu,Gui-Fang Huang,Fei Gao,Wei-Qing Huang
Transition metal (oxy)hydroxides are potential oxygen evolution reaction (OER) electrocatalysts; however, simultaneously modulating multiple factors to enhance their performance is a grand challenge. Here, we report an incorporating heteroatom strategy via one-step hydrothermal approach to adjust more than one factor of Mn-doped NiFe (oxy)hydroxide (Mn-NiFeOOH/LDH) heterojunction . Mn doping regulates heterojunction morphology (reducing nanoparticles and becoming thinner and denser nanosheets), Ni/Fe ratio and valence states (Ni 2+ , Ni 3+ , and Ni 3+Δ ) of Ni ions. The former could effectively increase surface active sites, and the latter two reduce the content of Fe in the Mn x -NiFeOOH/LDH heterojunction, enabling more Ni 2+ convert to Ni 3+/3+Δ that have higher intrinsic OER activity. As a result, the first-rank Mn-NiFeOOH/LDH with ultra-low overpotential of 185 mV@20 mA cm −2 and 296 mV@500 mA cm −2 , and the improved OER performance are outdo to those of commercial RuO 2 catalyst for OER. Moreover, the Mn-NiFeOOH/LDH affords the earliest initial potential (1.392 V vs. RHE), corresponds to a recorded low overpotential (162 mV). Based on the density functional theory (DFT), Mn dopants can alter intermediate adsorption energy and effectively decrease *OOH’s energy barrier. This research exhibits a feasible strategy to design low cost electrocatalysts and provide new possibilities for future industrialization.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Wanpeng Chen,Hongxia Liu,Yunzhu Wang,Yu Liu,Die Hu,Yuheng Huang,Xiaoliu Huangfu
Thallium(III) (Tl(III)) is mobile in acidic environments and under ligand complexation, posing a potential threat to the environment and human health. The adsorption of Tl(III) on manganese and iron (hydr)oxides will affect its environmental mobility and engineering removal efficiency. However, the adsorption behavior and interfacial reaction mechanism of Tl(III) remain largely unknown. This study is the first to elucidate the surface complexation mechanism of Tl(III) on Fe/Mn (hydr)oxides and to investigate the adsorption behavior of Tl(III) under the influence of typical environmental ligands. Deprotonation of surface hydroxyl groups contributes to the increase in adsorption capacity for Tl(III) (δ-MnO 2 , 1619.93 mg g −1 ; α-FeOOH, 48.25 mg g −1 ; and α-Fe 2 O 3 , 58.66 mg g −1 from Langmuir thermodynamic fitting). Surface complexation modeling reveals tridentate complexation of Tl(III) on birnessite and monodentate complexation on iron (hydr)oxides. The anionic ligand strongly inhibits the adsorption of Tl(III) (up to 16.0 %–40.0 %) by complexing with Tl(III) and occupying the adsorption sites. In addition, HA also reduces the adsorption of Tl(III) by 8.2 %–23.2 % by exacerbating the aggregation and surface coating of the adsorbent particles. New insights into the binding mechanism of Tl(III) on Fe/Mn oxides can help to guide the development of efficient Tl(III) removal adsorbents.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Bixiao Li,Danyang Xu,Yitong Chen,Wenjing Li,Hanyu Liu,Anees A. Ansari,Ruichan Lv
How to develop antitumor nanodrugs with low toxicity and a good curative effect is an urgent problem in the current biomedicine field. In this work, different proposed composites were simulated by the finite difference time domain (FDTD) and COMSOL, including the material element, refractive index, particle size, and shape. Also, different machine learning algorithms are utilized to predict the absorbance at the near-infrared laser of 980 nm of different materials. Through train, validation, and test, the prediction of the as-synthesized Pt–Mn has high absorbance. Then, inorganic Pt–Mn was coated with PEI in order to improve their biocompatibility. Pt–Mn nanoparticles can generate ROS under the single 980 nm laser irradiation as a photodynamic therapy (PDT) agent and as a photothermal therapy (PTT) agent to heat the cells with a photothermal conversion efficiency of 23.6%. In addition, the electrochemical and in vitro chemodynamic therapy (CDT) experiments prove that Pt–Mn nanozymes could mimic the activity of peroxidase and enhance the Fenton reaction, thereby catalyzing excess H2O2 to produce hydroxyl free radicals and illustrating the potential to induce tumor cell apoptosis as the CDT agent in a weakly acidic tumor environment to complete high-efficiency chemokinetic therapy. Finally, Pt–Mn–PEI nanoparticles were used for PDT/PTT/CDT and the immune checkpoint inhibitor of anti-PD-L1 is injected in order to obtain the assistant immunotherapy, providing a potential choice to anticancer through effective synergistic cancer therapies.
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Nanomaterials
·
2019
·Vol. 9
·期 5
·675
·
IF 4.034
Lei Zhu,Xi Li,Zhiying Liu,Lin Yao,Peng Yu,Ping Wei,Yanhua Xu,Xingmao Jiang
Mn-Ce-Zr-O catalysts doped with varying Mn content were prepared and assessed for the catalytic combustion of chlorobenzene (CB). Nanosized MCZ-0.67 catalyst with amorphous phase exhibited a high and stable catalytic activity among the studied catalysts, achieving 90% CB conversion at 226 °C and withstanding stability tests, including time-based stability and the successive influence of various operating conditions. Meanwhile, the MCZ-0.67 catalyst used showed good recyclability by calcination in air. Characterization results suggested that Mn doping played a dominant role in improving the catalytic performance, resulting in larger surface area, better redox properties and greater amounts of surface active oxygen. In addition, the introduction of Zr was also indispensable for maintaining the good catalytic performance of catalysts. Finally, trace amounts of polychlorinated by-products during CB oxidation were monitored and the oxidation process was discussed.Keywords:MnOx-CeO2-ZrO2;catalytic combustion;chlorobenzene;active oxygen;product analysis
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2025
·Vol. 39
·期 5
·e70141
·
IF 0
Huan Zhang,Wen-Qi Jin,Peng Li,Wei Gao,Xiu-Mei Zhang
A highly efficient photocatalyst, the CdS/Mn-MOF composite, was synthesized by first preparing a new 2D Mn-MOF (Mn(L)·H 2 O, H 2 L = 5-(2-benzothiazolyl)isophthalic acid) precursor through the solvothermal method and subsequently growing CdS nanoparticles. X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), UV–vis spectroscopy, and other techniques were utilized to characterize the structural, morphological, textural, compositional, and optical properties of the composites. The prepared photocatalysts, designated as X-CdS/Mn-MOF (where X = 50, 25, and 10, represents the mass percentage of CdS), were tested for photocatalytic performance. Among them, the 50-CdS/Mn-MOF sample exhibits the optimized degradation efficiency of 99.1% for Rhodamine B (RhB, 20 mg/L) in 50 min under visible light irradiation, which is 7.3 times and 2.4 times higher than that of Mn-MOF and CdS, respectively. Various test results indicate that the improved photocatalytic activity of CdS/Mn-MOF composites can be attributed to the formation of heterojunctions. Specifically, the heterojunctions enhance the separation efficiency of photogenerated carriers and effectively suppress the recombination of electrons and holes, thereby improving the overall efficiency of the photocatalytic reaction. Moreover, the presence of heterojunctions optimizes the material's band structure, facilitating more efficient carrier transport, which further enhances photodegradation performance. Radical quenching experiments confirmed hydroxyl radicals (·OH − ) and superoxide radical anions (·O 2 − ) played dominant roles in the photodegradation process. Additionally, the composite material also demonstrates good stability and reproducibility. The research further provides evidence that the efficiency of dye degradation can be significantly improved by the rational design of composite catalysts consisting of other semiconductors and MOFs.
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Catalysis Science & Technology
·
2025
·
IF 4.2
Yilin Zhao,Fangwei Liu,Jingbo Hu,Yang Yang,Jianzhou Wu,Shihui Zou,Jie Fan
The Mn–Na2WO4/SiO2 catalyst for oxidative coupling of methane (OCM) is highly appealing and promising but its high light-off temperature (>800 °C) hinders its industrial application. Engineering catalysts for efficient catalytic performance is attractive yet challenging. In this study, we demonstrate that the incorporation of small amounts of silver into the Mn–Na2WO4/SiO2 catalyst significantly improves its performance, achieving a C2 yield of up to 20% at 750 °C. Characterization results indicate that silver facilitates O2 activation and promotes C–H bond activation, thereby further enhancing CH4 conversion. The findings offer valuable insights into advancing the design concept of high-performance OCM catalysts.
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JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Yanli Kong,Siyu Dai,Qingwu Chen,Yong Nie,Jiangya Ma
Slow transformation efficiency of Fe(III)/Fe(II) limits the generation of radicals in peroxymonosulfate (PMS)-based advanced oxidation processes (AOPs), and these radicals was easy to be interfered by the presence of water constituents. In addition, in-situ coagulation during this oxidation process was neglected. This study proposed Fe(II)/PMS-Mn(VII) in the presence of chlorides ions (FPMC) process to reveal multiple promoting effects of Mn on redox cycle of Fe(III)/Fe(II) and different reactive mechanisms of Cl − on types of radicals generation pathways, and the in-situ coagulation enhanced mechanisms was investigated. Results showed that the dual functionality of oxidation and in-situ coagulation in FPMC process was significantly enhanced that carbamazepine (CBZ) could be efficiently and quickly removed. The reduction product Mn(III) of Mn(VII) could promote the redox cycle of Mn(II)/Mn(III) and Mn(III)/Mn(IV) that facilitated Fe(III)/Fe(II), sustaining the reactivity of the system. Cl − could significantly promote the cycling of Mn(Ⅲ)/Mn(Ⅳ) that indirectly affected the cycle of Fe(III)/Fe(II).
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OPTICAL MATERIALS
·
2025
·
IF 4.2
Chen-Yang Qi,Dan Zhao,Rui-Juan Zhang,Qing-Xia Yao
Mn 4+ has garnered significant global interest due to its application in red light emission, particularly within the realm of plant growth lighting. However, there are relatively few studies focusing on the incorporation of Mn 4+ into titanate materials. In this research, we synthesized a series of Ba₆Y₂Ti 4-x O₁₇ (BYT: x Mn⁴⁺) phosphors with varying concentrations of Mn 4+ using a high-temperature solid-state synthesis method. Initially, we confirmed the structural integrity and phase purity of the samples through X-ray diffraction (XRD) analysis and refinement techniques. The experimental results indicate that under near-ultraviolet (UV) excitation, these phosphors emit far-red light at approximately 700 nm. Furthermore, their emission spectra align closely with the spectral requirements of chlorophyll and photoreceptive pigments (P r and P fr ), which are essential for optimal plant growth. This characteristic makes them promising candidates for plant cultivation applications. Consequently, we posit that BYT:0.015Mn⁴⁺ represents a novel titanate-based far-red emitting material with considerable potential for use in LED lighting systems designed for plant growth particularly in enhancing photosynthetic efficiency and promoting overall plant development.
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