JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Jianghua Wu,Zhen Shen,Jie Zhao
Sodium-ion hybrid supercapacitors, as emerging energy storage devices, require structural optimization of electrode materials for performance enhancement. This study employs a facile one-step hydrothermal synthesis to construct Ru/MnO 2 electrode materials featuring single site defects and crystalline-amorphous heterointerfaces, elucidating the synergistic mechanism of dual structural features on sodium storage properties. Aberration-corrected high-resolution transmission electron microscopy verifies the atomic-level dispersion of single site defects. High-resolution transmission electron microscopy unambiguously reveals the ubiquitous distribution of crystalline-amorphous heterointerfaces within the Ru/MnO 2 electrode. Electrochemical evaluations demonstrate that the composite electrode delivers a remarkable specific capacitance of 377.6 F g −1 at 1 A g −1 , demonstrating a 75.2 % enhancement compared to conventional manganese oxide counterparts (215.5 F g −1 ). The corresponding device achieves a peak energy density of 59.6 Wh kg −1 while maintaining 93 % capacity retention after 10,000 cycles at 10 A g −1 . This work proposes a novel structural engineering paradigm for advancing high-performance sodium-ion energy storage systems through defect-interface synergy.
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高影响因子
Reaction Chemistry & Engineering
·
2025
·
IF 3.1
Qiang Bao,Wenhui Feng,Yunfeng Hu,Zhenlu Wang,Guoliang Wu,Zhirui Chen,HaoCheng Li,Chenguang Shi
In this work, a series of alkaline earth metal-modified manganese oxide catalysts were prepared via the impregnation method and applied to the oxidative coupling reaction of alcohols and amines to imine. The prepared catalysts were characterized by X-ray diffraction (XRD), N2-adsorption, field emission-scanning electron microscopy (FE-SEM), H2 temperature-programmed reduction (H2-TPR), NH3-temperature-programmed desorption (NH3-TPD), CO2-temperature-programmed desorption (CO2-TPD) and X-ray photoelectron spectroscopy. Among the catalysts, Ba/MnO2 showed the best catalytic performance in the reaction and exhibited the highest Mn3+/Mn4+ ratio, surface weak basic sites and a relatively small number of weak acidic sites. Lattice oxygen mobility and Mn3+/Mn4+ ratio were found to play important roles in the catalytic activity of aerobic reactions. The weak and medium basic sites on the catalyst surface can further promote the alcohol–amine oxidative coupling process, as they serve as active centers for the activation of benzyl alcohol, which is the rate-determining step for this oxidative coupling reaction.
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高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Bin Cui,Yunfeng Zhu,Tongrui Hu,Jingwei Liu,Jiahao Wu,Yana Liu,Jiguang Zhang,Rui Shi,Zhixin Ba,Jun Wang,Jian Yang
The exploration of non-precious metal catalysts (NPMCs) with high activity and excellent stability for the oxygen reduction reaction (ORR) is significant to develop the fuel cells and metal-air batteries (MABs) for large-scale applications. Heterointerface engineering is deemed as a prospective strategy to improve the ORR activity by modulating the inner electronic structure and enhancing the surface properties. Herein, the uniformly dispersed MnCo 2 O 4 nanoparticles on α-MnO 2 nanotubes were fabricated via a two-step route, and the nanoparticle size was regulated at different calcination temperatures to obtain MnCo 2 O 4 /α-MnO 2 catalysts (MCM-T, T = 450 ℃, 600 ℃, 750 ℃, 900 ℃). Benefiting from the large specific surface area, hierarchical porous structure and high ratio of (Mn 3+ +Mn 4+ )/Mn 2+ , the MCM-450 catalyst exhibits superior ORR activity with a half-wave potential of 0.78 V ( vs . RHE) and remarkable stability in 0.1 M KOH solution. Correspondingly, an impressive specific capacity (875.6 mAh g −1 ), a high discharge plateau (1.37 V) and a noticeable peak power density (151.1 mW cm −2 ) are achieved in MCM-450-based liquid aluminum-air batteries (LAABs), surpassing the performance of the commercial 20 wt% Pt/C catalyst (601.0 mAh g −1 , 1.31 V, and 128.2 mW cm −2 ). This work provides a new strategy on developing transition metal oxides (TMOs) catalysts and endows an opportunity for efficient sustainable energy storage.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yadi Wang,Jingang Zhao,Taoyang Zou,Yuekun Jing,Yixuan Song,Guanchao Wang,Fang Liu,Guofei Jiang
In order to address the issue of air pollution caused by the volatilization of VOCs in oilfield mud storage tanks and further reduce the energy consumption associated with traditional thermal oxidation technology, this study employs a photothermal synergistic catalytic oxidation method for the treatment of oilfield VOCs. A series of Ni/α-MnO 2 catalysts doped with varying nickel contents were synthesized via the hydrothermal method using transition metals, with propane selected as the representative pollutant. The incorporation of nickel enhances the adsorption capacity of O 2 to a certain extent. Simultaneously, it increases the competitive adsorption intensity of O 2 in the presence of coexisting H 2 O and O 2 , thereby exhibiting superior catalytic oxidation performance for propane. Compared to the single-component α-MnO 2 material (T 90 = 228 °C), the 40 %Ni/α-MnO 2 composite catalytic material showed excellent degradation ability for propane (T 90 = 206 °C) and good long-term stability. Furthermore, based on density functional theory (DFT) calculations, a plausible mechanism for propane removal was proposed. Consequently, this study offers novel insights into the design and synthesis of efficient catalysts and the degradation of VOCs.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Chao Feng,Gaoyan Xiong,Fei Jiang,Qianqian Gao,Chong Chen,Yuan Pan,Zhaoyang Fei,Yanpeng Li,Yukun Lu,Chenguang Liu,Yunqi Liu
Through morphology control and structure construction of manganese catalyst to improve the conversion of VOCs is still a significant challenge in the field of environmental catalysis. Herein, secondary sphere structured δ-type manganese oxide (MnO 2 -SS) was synthesized via a simple room temperature two-step method. Compared with other sphere-type MnO 2 samples, MnO 2 -SS exhibited a higher propane oxidation activity (T 90 = 238 ℃), turnover frequency (14.54 × 10 −7 s −1 at 240 ℃), and stability in H 2 O, NO 2 , and CO atmospheres. Experimental results indicated that MnO 2 -SS exhibited an ultrahigh specific surface area, a high surface concentration of active Mn 4+ species and superior surface oxygen mobility. In-situ DRIFTs revealed that active oxygen species exhibit a key role in formation and dissociation of intermediate carboxylates. Electron paramagnetic resonance, O K-edge results and density functional theory calculation revealed that numerous oxygen vacancies existed on MnO 2 -SS. These vacancies can facilitate adsorption and activation of O 2 to generate active reactive oxygen species, which lead to superior propane and intermediate carboxylates oxidation activity. This work provides new strategy to enhance the surface oxygen activity of manganese oxide.
研究领域:
环境催化
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材料科学
·
化学工程
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2025
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IF 3.9
Zheng Zhang,Dan Sui,Lingling Yang,Man Xu,Kangjun Wang
Lanthanide-doped upconversion nanoparticles (UCNPs) can achieve multiple emissions and have garnered significant attention in accurate diagnostics over the past few years. Herein, multifunctional core–shell nanoplatforms (UCNP/Au@MnO2 NPs) were developed by combining Au, UCNP and mesoporous MnO2. Under near-infrared (NIR) laser irradiation, the UCNP/Au@MnO2 NPs achieved excellent photothermal conversion and photoluminescence properties. The UCNP/Au@MnO2 NPs have demonstrated exceptional performance in fluorescence quenching and recovery, as MnO2 can serve as both a fluorescence quencher and a GSH recognizer. Moreover, the mesoporous MnO2 shell of the UCNP/Au@MnO2 NPs served as an effective nanocarrier. A comprehensive analysis of drug release kinetics and mechanisms revealed that the UCNP/Au@MnO2 NPs exhibited sensitive GSH- and NIR-responsive drug release behavior. The cumulative drug release reached up to ca. 94.52%, with the release profile being dependent on both GSH concentration and NIR laser irradiation. Thus, the work highlights the potential of UCNP/Au@MnO2 NPs as a versatile platform for applications, such as smart photoluminescence, photothermal conversion, and controlled drug release.
研究领域:
纳米技术
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材料科学
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生物医学工程
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光学
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药学
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xueming Bao,Leilei Wu,Biaobiao Yan,Ying Liu,Man Zhou,Qiang Wang,Ping Wang
Transition metal oxides have shown great potential in catalytic indoor pollutant removals, but their applications are hindered by the poor aqueous dispersity, inhalable powder forms and concerning substrate adhesion. Herein, we proposed a simple technique to fabricate durable textile coatings with ‘brick-mud’ nanostructure of Ti 3 C 2 T x (MXene) and manganese dioxide (MnO 2 ). Viscosity-controllable inks were prepared by hybridizing inulin-templated MnO 2 nanoparticles with acid-etched MXene nanosheets at room temperature, establishing firm bindings through coordination bonds between transition metal cores and hydroxyls, covalent redox linkages of Mn/Ti vacancies and intermolecular hydrogen bonds. Meanwhile, the high flatness of MXene optimized the binder/catalyst-free deposition of MnO 2 onto cotton textiles, simplifying the finishing process and providing MXene@MnO 2 coatings with encouraging fastness through the aforementioned triple bridges. Consequently, the resulting textiles exhibit satisfactory photo-antibacterial activities against gram negative and positive bacteria (>99 % within 10 min), accompanying with promising formaldehyde (HCHO) removal ability (>83 % within 30 min) and encouraging ultraviolet-absorption property (<0.05 % of UVA). Summarily, the presented deposition strategy of ‘brick-mud’-like coatings of transition metal catalysts on textiles provides a reliable alternative for the fabrication of multifunctional home textiles to improve indoor living quality.
研究领域:
材料科学
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环境科学
·
纺织工程
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Advanced Materials Technologies
·
2020
·Vol. 5
·期 8
·2000272
·
IF 5.969
Xingxing Li,Yanan Ma,Peizhi Shen,Chuankun Zhang,Minglei Cao,Shaojun Xiao,Jinfeng Yan,Shijun Luo,Yihua Gao
Ti 3 C 2 T x MXene, as a new 2D material, with unique physical and chemical properties, is ideal for building high performance miniaturized electrochemical energy storage devices. However, the operating voltage window of Ti 3 C 2 T x based microsupercapacitor (MSC) in symmetric structure is very narrow (≤0.6 V), which affects its practical application. Herein, a flexible asymmetric microsupercapacitor (AMSC) based on Ti 3 C 2 T x //polypyrrole (PPy)/MnO 2 is reported, where Ti 3 C 2 T x is deposited on graphite paper (GP) by electrophoresis method as negative electrodes, MnO 2 and PPy are electrochemically deposited on GP successively as positive electrodes, and polyvinyl alcohol/sulfuric acid (PVA/H 2 SO 4 ) as the quasi-solid electrolyte. This AMSC based on Ti 3 C 2 T x //PPy/MnO 2 operates at 1.2 V voltage window, which is two times wider than symmetric Ti 3 C 2 T x based MSC. And its maximum areal capacitance and areal energy density can reach up to 61.5 mF cm −2 and 6.73 µWh cm −2 respectively. Moreover, three above AMSCs in series connection can turn on three lights after being charged. And the AMSC also shows high flexibility under mechanical bending level (bending angle with 0°–180°). The flexible AMSC based on Ti 3 C 2 T x //PPy/MnO 2 with ultrahigh energy density is a promising candidate for exploiting and fabricating next-generation miniature integrated energy storage devices.
研究领域:
材料科学
·
能源存储技术
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Materials
·
2026
·Vol. 19
·期 2
·
IF 3.2
Mengjie Huang,Baihui Zhang,Xiangyu Jiang,Maojie Jiang,Peng Yin,Xuan Fang,Yanna Lin,Fuqiang Ma
This study addresses the issues of poor stability and difficulty in recovery of free horseradish peroxidase (HRP) by developing a multi-level composite immobilized carrier that combines high loading capacity with long-term stability. The SiO2@MnO2@MAF-7 core–shell structured carrier was prepared via a solvothermal self-assembly method. Three immobilization strategies—adsorption, covalent cross-linking, and encapsulation—were systematically compared for their immobilization efficacy on HRP. The material structure was analyzed using techniques such as specific surface area analysis (BET), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR) to characterize the material structure. Enzyme kinetic parameter determination experiments were conducted to systematically evaluate the performance advantages of the immobilized enzyme. BET analysis showed that SiO2@MnO2@MAF-7 had a specific surface area of 251.99 m2/g and a mesoporous area of 12.47 nm, and its HRP loading was 50.37 U/mg (immobilization efficiency 85.03%). Compared with free HRP, the Km value of the immobilized enzyme was decreased by 42%, the activity retention rate was increased by 35–50% at 80 °C and pH 4–9, and the activity was maintained by 65% after five repeated uses. In this study, MAF-7 was combined with MnO2/SiO2for HRP immobilization for the first time, and the triple effect of rigid support-catalytic synergy-confined protection synergistically improved the stability of the enzyme, providing a new strategy for the industrial application of oxidoreductases.
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PubMed
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2023
·Vol. 88
·期 8
·2174-2188
·
IF 2.7
Li Xiaoyan,Zhang Hongbin,Zhang Guozhen,Zhou Tianhong,Min Rui
View large Download slide View large Download slide Close modal Four kinds of manganese oxides were successfully prepared by hydrothermal and redox precipitation methods, and the obtained oxides were used for CIP removal from water by activating PMS. The microstructure and surface properties of four oxides were systematically characterized. The results showed that ε -MnO 2 prepared by the redox precipitation method had large surface area, low crystallinity, high surface Mn(III)/Mn(Ⅳ) ratio and the highest activation efficiency for PMS, that is, when the concentration of PMS was 0.6 g/L, 0.2 g/L ε -MnO 2 could degrade 93% of CIP within 30 min. Multiple active oxygen species, such as sulfate radical, hydroxyl radical and singlet oxygen, were found in CIP degradation, among which sulfate radical was the most important one. The degradation reaction mainly occurred on the surface of the catalyst, and the surface hydroxyl group played an important role in the degradation. The catalyst could be regenerated in situ through the redox reaction between Mn 4+ and Mn 3+ . The ε -MnO 2 had the advantages of simple preparation, good stability and excellent performance, which provided the potential for developing new green antibiotic removal technology. Epsilon-MnO 2 nanoflowers were simply prepared by the redox precipitation method. Epsilon-MnO 2 nanoflowers were used to activate PMS to degrade CIP in water. The high activity of ε-MnO 2 was due to its large surface area, low crystallinity and high surface Mn(III)/Mn(Ⅳ) ratio. The –OH groups on the surface could promote the activation of PMS.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 13.2
Mingjun Nan,Jiaying Yan,Qizhen Cui,Wanyao Sun,Shujie Gao,Xinyu Guo,Wendi Jin,Xiangkun Ma
Slurry flow batteries have recently garnered escalating attention due to their super-high theoretical capacity (utilizing insoluble redox-active materials and breaking through the solubility limit). Nevertheless, several longstanding and intractable issues, such as insoluble materials activity, cycling stability and static stability, must be resolved. This study demonstrates an innovative colloidal electrolyte-mediated dispersion and transport mechanism within a MnO 2 -based slurry flow battery (MnO 2 -SFB). Specifically, the MnO 2 particles are produced on the surface of colloidal substances and co-flow therewith. In this way, agglomeration and sedimentation are prevented, which helps maintain the stability of MnO 2 -SFB. Simultaneously, owing to the robust charge interaction among the colloidal materials and MnO 2 , the dispersion of MnO 2 particles is enhanced. During the discharge process, the reduction activity is augmented via the synergistic effect of electrochemical and chemical reactions, thus ensuring the reversibility of the battery. Consequently, the PBI-MnO 2 -SFBs can achieve running stability for over 300 cycles at 80 mA cm −2 with an average energy efficiency of 81 % at a volume capacity of 42.8 Ah L −1 . Moreover, the MnO 2 -SFBs with PBI colloidal material can work effectively after static for over 60 days, which is, to our knowledge the highest value ever reported for slurry flow batteries. Overall, this study provides new insights into exhibiting highly reversible and long-cycling-capability slurry flow batteries and promotes their development.
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高影响因子
ANALYST
·
2020
·Vol. 145
·期 15
·5206-5212
·
IF 3.978
Tianzi Li,Yetong Gao,Huiya Li,Chenyang Zhang,Yifei Xing,Meng Jiao,Yu-e Shi,Wei Li,Yongqing Zhai,Zhenguang Wang
Butyrylcholinesterase (BChE) activity is an important index for a variety of diseases. In this work, a “turn-on” assay is proposed based on controlling the inner filter effect (IFE) of MnO2 nanosheets (NSs) on sulfur nanodots (S-dots). The fluorescence of S-dots is effectively quenched by the MnO2 NSs, due to the wide overlap of the emission spectrum of S-dots and absorption spectrum of MnO2 NSs, together with the superior light absorption capability of MnO2 NSs. BChE can catalyze acetylthiocholine and produce thiocholine, which effectively decomposes the MnO2 NSs into Mn2+, resulting in the disappearance of the IFE and recovery of fluorescence of S-dots. Two-stage linear relationships between the ratio of fluorescence intensity and concentration of BChE are observed from 0.05 to 10 and from 10 to 500 U L−1. A limit of detection of 0.035 U L−1 is achieved, which is the best performance so far. The as-proposed assay is robust enough for practical detection in human serum, and it can avoid interference from its sister enzyme (acetylcholinesterase) and glutathione at the micromolar level. The presented results provide a clue for the functionalization of S-dots, and offer a powerful tool as an analytic technique for nanomedicine and environmental science.
研究领域:
分析化学
·
纳米技术
·
生物医学工程
·
环境科学
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高影响因子
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