CERAMICS INTERNATIONAL
·
2026
·
IF 5.6
Ruiling Chang,Zhonghua Yao,Hua Hao,Minghe Cao,Hanxing Liu
BaTiO 3 -based ceramics are widely used as dielectric materials in base metal electrode multilayer ceramic capacitors (BME-MLCCs), and enhancing their stability is of considerable importance. In this study, Mn 2+ and Y 3+ are co-doped into BaTiO 3 via a chemical method. The acceptor Mn 2+ suppresses carrier migration, while Y 3+ promotes the formation of defect associates that further impede carrier movement, leading to a synergistic enhancement in both reduction resistance and dielectric stability. The results demonstrate that the formation of a core-shell structure significantly enhances both the reduction resistance and the temperature stability of the ceramics. Appropriate co-doping of Mn 2+ and Y 3+ effectively reduces the grain size and increases the activation energy of grain boundaries, thereby improving the bias stability. Simultaneously, co-doping helps maintain a low oxygen vacancy concentration and promotes the formation of defect dipoles ( [ M n T i ″ · V O · · ] , [ 2 M n T i ′ · V O · · ] and Y B a · Y T i ′ ), which further synergistically enhances the bias stability. In particular, the BT-M2Y1 ceramic exhibits a high insulation resistivity of 1.63 × 10 11 Ω cm, indicating good reduction resistance. Its temperature stability meets the EIA X8R specification. Under a DC bias field of 2.0 V/μm, the ceramic shows a minimal variation in dielectric constant of only −0.61 %, demonstrating excellent DC bias stability. Moreover, the BT-M2Y1 ceramic maintains a relatively high dielectric constant (∼1550) and a low dielectric loss (∼0.0078) even with a fine grain size of 204 nm. This study provides an important experimental basis for developing highly stable dielectric materials for BME-MLCCs.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·Vol. 45
·期 22
·12237-12243
·
IF 4.939
Xiaodeng Wang,Hao Tian,Mingyu Pi,Dingke Zhang,Shijian Chen
Designing earth-abundant and highly active hydrogen evolution reactions (HER) electrocatalysts is pivotal for developing renewable energies. Here, we report that Mn-doped NiSe 2 nanosheets is successfully fabricated on carbon fiber cloth by solvothermal process and followed selenide reaction, showing excellent catalytic performance for electrochemical water splitting. Benefiting from the unique electronic property modified by Mn doping and nanosheets structures, the obtained electrodes only requires low overpotential of 86 mV to achieve the current density of 10 mA/cm 2 in acid solution. Moreover, the higher normalized exchange current densities manifest that Mn doping can improve the intrinsic activity of NiSe 2 . Furthermore, first-principle calculation results manifest that Mn doping can optimize the electronic structures to reduce hydrogen adsorption energy and consequently improve the HER active. This novel method is expected to provide new chances for developing efficient catalysts for energy conversion applications.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2026
·
IF 21.1
Yifei Liu,Kaicai Fan,Cheng-Hao Chuang,Porun Liu,Zumin Wang,Lingbo Zong,Lei Wang
The nanoconfined environment offers a synergistic combination of physical confinement and electronic regulation, yet its underlying microscopic mechanisms remain to be systematically elucidated. Herein, we fabricate atomically dispersed homonuclear Mn catalytic pairs through the perhalate cascaded oxidation strategy within nanoconfined pores on activated mesoporous carbon spheres (Mn 2 -N-AMC). Finite element method (FEM) simulations and density functional theory (DFT) calculations reveal that nanoconfinement enhances O 2 transport and weakens the adsorption of oxygen intermediates. Furthermore, the bridge adsorption configuration of intermediates on Mn pairs promotes the subsequent O* protonation and reduces the energy barrier for OH* desorption. Consequently, Mn 2 -N-AMC exhibits superior radical scavenging capability and delivers excellent oxygen reduction reaction (ORR) performance with a half-wave potential (E 1/2 ) of 0.90 V and remarkable stability. Additionally, Mn 2 -N-AMC-based aqueous Zn-air batteries (A-ZABs) achieve an ultrahigh power density of 256.7 mW cm −2 and long-life stability (> 800 h). Quasi-solid-state ZABs also display a long-life operation over 100 h across various current densities, with negligible voltage gap decay. This work provides mechanistic insights, advancing the rational design of nanoconfined ORR catalysts for sustainable energy conversion and storage.
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JOURNAL OF RARE EARTHS
·
2026
·
IF 7.2
Mei Lin,Jianwang Wu,Yifang Wu,Zuliang Chen
The chemical activation method has been widely applied for the in-situ generation of hydrogen peroxide (H 2 O 2 ), enabling effective facilitate environmental remediation and pollution control. However, developing self-Fenton catalysts with both high catalytic activity and good stability still poses significant challenges. In this study, a ternary ZVI-Mn/La 100 catalyst featuring a core-shell chain architecture was synthesized by a one-step method, and an environmentally friendly self-Fenton system was constructed for the efficient degradation of enrofloxacin (ENR). Compared with the ZVI-Mn catalyst, the removal efficiency of ENR by the ZVI-Mn/La 100 catalyst increases by 20.8%. X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT) analyses indicate that La doping significantly promotes the cyclic regeneration of low-valent manganese and induces the formation of oxygen vacancies. Continuous flow experiments show that the catalyst maintains a high ENR removal efficiency of 88.1% over an 8 h operation, demonstrating its excellent stability and promising engineering application prospects. This work presents a novel strategy for designing highly efficient and stable self-Fenton catalysts, offering significant implications for reducing wastewater treatment costs and improving overall treatment efficiency.
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CERAMICS INTERNATIONAL
·
2026
·
IF 5.6
Wenming Shi,Che Sun,Hongjun Zhang,Yingchun Liu,Lang Bian,Yuanhao Deng,Bin Yang
High-power PZT-based piezoelectric ceramics with high electromechanical properties are in urgent demand in the market. In this study, Mn ions were introduced into 0.36 Pb(Ni 1/3 Nb 2/3 )O 3 –0.28PbZrO 3 –0.36PbTiO 3 (PNN–PZT) ceramics in the form of Pb(Mn 1/3 Nb 2/3 )O 3 (PMnN) to synthesize a quaternary piezoelectric ceramic ( x PMnN–PNN–PZT) with coexistence of rhombohedral and tetragonal phases. The addition of PMnN caused the grain sizes to continuously decrease from 3.29 μm to 1.58 μm. However, the density first increased and then decreased, reaching a maximum value of 8.02 g/cm 3 at x = 0.07. The increased internal bias field ( E i ) and domain size suppressed the domain wall motion and domain switching, reducing internal friction and improving the mechanical quality factor ( Q m ). Compared with Q m ∼146 of undoped PNN–PZT ceramics, the maximum Q m of 0.07PMnN-PNN-PZT reached approximately 2244. And the Vickers hardness of x PMnN–PNN–PZT ceramics was promoted from ∼356 HV ( x = 0) to ∼480 HV ( x = 0.07). In addition, the other optimal electromechanical performances: piezoelectric coefficient d 33 = 202 pC/N, planar electromechanical coupling coefficient k p = 0.45, Curie temperature T c = 198 and dielectric loss tan δ = 0.0059 were also achieved at x = 0.07. This work provides a feasible way for the development and application of high-power piezoelectric ceramics.
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DALTON TRANSACTIONS
·
2026
·
IF 3.3
Weixin Mo,Liming Yang,Xinggui Gu,Huiyu Li,Yongjun Feng
Near-infrared (NIR)-responsive photothermal materials are critical for solar energy conversion, yet conventional materials face limitations in efficiency, stability, and spectral tunability. Herein, we report a Mn-doped Prussian blue intercalated MgAl-layered double hydroxide (Mn-PB@LDHs) synthesized via a separate nucleation and aging steps (SNAS) method, achieving synergistic enhancement in photothermal performance and stability. The optimized Mn-PB@LDH-3 exhibits a high photothermal conversion efficiency (75.10% under 808 nm laser, 0.5 W·cm⁻²) and solar-driven water evaporation performance (1.60 kg·m⁻²·h⁻¹, 97.93% under 1 kW·m⁻² simulated sunlight). Moderate Mn²⁺ doping optimizes the Prussian blue electronic structure by enhancing metal-to-metal charge transfer and reducing resistance, while excessive doping amount induces Jahn–Teller distortion and electron localization, impairing efficiency. The MgAl-LDH host confers stability via nanoconfinement (suppressing structural degradation) and electrostatic interactions (inhibiting metal leaching under alkaline conditions). This work presents a high-performance, stable photothermal material and establishes a generalizable host–guest strategy for advanced solar energy conversion applications.
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PubMed
高影响因子
Nano-Micro Letters
·
2026
·Vol. 18
·期 1
·420
·
IF 38.5
Du Wenqing,Xu Lin,Yang Yi,Sun Jingying,Yang Gongzheng,Wang Chengxin
A degradation chain reaction triggered by Mn dissolution is revealed, clarifying the continuous performance deterioration caused by Mn dissolution.
A strategy for in situ surface repair is proposed, which achieves long-term stability through the synergistic action of high-concentration electrolyte and Fe 3+ filling of Mn vacancies.
After 20,000 cycles at a current density of 2 A g −1 , the repaired electrode exhibited a capacity retention rate of 80%, outperforming most previously reported manganese-based aqueous sodium-ion battery cathodes.
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高影响因子
SOLID STATE COMMUNICATIONS
·
2026
·
IF 2.8
Han Zheng,Dongxu Pan,Ling Zhang,Guodong Yang,Zhengfa Li
Moderate Mn doping at x = 0.01 pins ferroelectric domains, yielding slim hysteresis loops and optimal energy-storage efficiency. • Higher Mn doping of x ≥ 0.02 induces a phase transition of coexisting AFE P and FE Q phases, in which the FE Q phase can broaden hysteresis loops and increase energy-storage density. • With increasing doping content of Mn, the site of Mn substitution transitions from A site to B site. (1- x )NaNbO 3 - x MnO 2 ceramics were synthesized via solid-state reaction method. X-ray diffraction with Rietveld refinement shows that increasing Mn content induces a phase transition from a single antiferroelectric P phase ( Pbcm ) to the coexistence of P and ferroelectric Q phases ( P2 1 ma ). Scanning electron microscopy indicates that Mn doping promotes grain growth. Dielectric patterns demonstrate that moderate Mn doping with x = 0.01 effectively suppresses leakage current and reduces dielectric loss (tanδ = 0.526 at 25 °C and 56.4 MHz). Electrical measurements show that the composition of x = 0.01 achieves the optimal energy-storage efficiency, and the composition of x = 0.025 attains the recoverable energy-storage density of 0.531 J/cm 3 . The study illustrates that Mn doping tunes phase composition and defects, thereby optimizing the energy-storage properties of lead-free NaNbO 3 -based ceramics.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2025
·
IF 4.7
Lei Xu,Mao-Ling Luo,Jing-Jing Dai,Huan Zhu,Feng-Qing Yang
Iron ion (Fe(III)) plays a crucial role in many physiological processes, and both excess and deficiency of Fe(III) can lead to diseases. Therefore, developing simple and reliable methods for detecting Fe(III) is of great importance. Based on a novel Mn-based material (coordination of manganese with 2,6-dicarboxypyridine, Mn-DPA) prepared in this study with Fe(III)-enhanced peroxidase-like activity, an efficient fluorescence method was developed for Fe(III) detection. The method demonstrated excellent analytical performance in detecting Fe(III), such as superior selectivity and an extremely low detection limit (0.66 nM). Furthermore, the mechanism of Fe(III) enhancing the enzyme-like activity of Mn-DPA was investigated, and the results suggest that the addition of Fe(III) can promote the generation of active intermediates (hydroxyl radicals) during the reaction. Additionally, Mn-DPA based fluorescence method has been successfully applied to detect Fe(III) in spinach, with recovery rates in the range of 90.9 %–115.6 %. The fluorescence method established in this study holds significant application potential for Fe(III) detection.
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Catalysts
·
2025
·Vol. 15
·期 10
·933
·
IF 4
Junxi Tang,Yue Zhang,Jun Yin,Yiwen Chen,Guocheng Deng,Yulong Jin,Jie Xu,Bing Xue,Fei Wang
The utilization of carbon dioxide (CO2) for synthesizing value-added chemicals represents a promising environmentally sustainable strategy. Herein, we synthesized a series of Mn2O3catalysts derived from metal-organic frameworks (MOFs) incorporating three different ligands—homophthalic tricarboxylic acid (H3BTC), 1,4-benzenedicarboxylic acid (H2BDC), and a combination of polyvinyl pyrrolidone (PVP) with H3BTC—via a hydrothermal method for ethylene urea (EU) production from CO2and ethylenediamine (EDA). The Mn2O3catalyst derived from the H3BTC+PVP ligand system (designated MnTP) demonstrated superior catalytic performance, achieving 97% EDA conversion and 97% EU selectivity under mild conditions (100 °C, 1 min), which surpassed all previously reported catalysts under comparable conditions. The enhanced activity originated from structural improvements induced by the H3BTC+PVP precursors, particularly the promotion of oxygen vacancies and Mn3+species, thereby facilitating efficient CO2activation and binding. This work establishes a novel strategy for the sustainable conversion of CO2into high-value cyclic ureas through rational catalyst design.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Yurong Ren,Xiaofang Lai,Minhao Guo,Ruiqi Wang,Jun Deng,Jikang Jian
Three layered quaternary sulfides, NaLi M S 2 ( M = Mn, Fe, Co) were synthesized by solid-state reactions. They adopt a trigonal CaAl 2 Si 2 -type structure (S.G. P -3 m 1) with Li and M randomly distributed at the tetrahedral metal site. Magnetic measurements reveal spin-glass ground states for these compounds, in contrast to the long-range antiferromagnetic order in the ternary counterpart NaFe 1.6 S 2 . As evidenced by electrical resistivity and optical measurements , all these three compounds show semiconducting nature, consistent with the results of first-principles calculations. The measured band gaps are 3.4 eV and 1.25 eV for NaLiMnS 2 and NaLiCoS 2 , respectively. Photoelectric measurements on NaLiCoS 2 demonstrate its potential application in photovoltaic devices .
研究领域:
材料科学
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固体化学
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凝聚态物理
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无机化学
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功能材料
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Catalysts
·
2022
·Vol. 12
·期 12
·1606
·
IF 4.501
Ruicheng Li,Jianhua Xiong,Yuanyuan Zhang,Shuangfei Wang,Hongxiang Zhu,Lihai Lu
In this study, a Co-Mn/CeO2composite was prepared through a facile sol-gel method and used as an efficient catalyst for the ozonation of norfloxacin (NOR). The Co-Mn/CeO2composite was characterized via XRD, SEM, BET and XPS analysis. The catalytic ozonation of NOR by Co-Mn/CeO2under different conditions was systematically investigated, including the effect of the initial solution’s pH, Co-Mn/CeO2composite dose, O3dose and NOR concentration on degradation kinetics. Only about 3.33% of total organic carbon (TOC) and 72.17% of NOR could be removed within 150 min by single ozonation under the conditions of 60 mg/L of NOR and 200 mL/min of O3at pH= 7 and room temperature, whereas in the presence of 0.60 g/L of the Co-Mn/CeO2composite under the same conditions, 87.24% NOR removal was obtained through the catalytic ozonation process. The results showed that catalytic ozonation with the Co-Mn/CeO2composite could effectively enhance the degradation and mineralization of NOR compared to a single ozonation system alone. The catalytic performance of CeO2was significantly improved by the modification with Mn and Co. Co-Mn/CeO2represents a promising way to prepare efficient catalysts for the catalytic ozonation of organic polluted water. The removal efficiency of NOR in five cycles indicates that Co-Mn/CeO2is stable and recyclable for catalytic ozonation in water treatment.Keywords:antibiotics;catalytic ozonation;emerging contaminant;Co-Mn/CeO2;norfloxacin
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