APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Wei Liao,Minghu Zhang,Jiangping Liu,Weikun Wang,Jichang Lu,Jin Zhang,Yumin Zhang,Wenjie Zhu,Yongming Luo
Previous studies have primarily focused on the role of single defects, particularly oxygen vacancies, in the catalytic oxidation of volatile organic compounds (VOCs). However, the mechanisms by which coexisting defects influence catalytic activity remain unclear. In this work, dual manganese and oxygen vacancies were introduced in Mn 3 O 4 via solvothermal synthesis and low-temperature H 2 treatment, and a comprehensive analysis of catalysts with varying defect configurations was performed. The introduction of dual vacancies in V Mn -100-1 resulted in a reduced MnO 4 /MnO 6 ratio, leading to significant structural modifications. These changes enhanced the redox properties and promoted the migration of oxygen species. Consequently, V Mn -100-1 exhibited superior catalytic performance, stability, and moisture resistance (15%) for the complete oxidation of styrene. Additionally, designed experiments and density functional theory (DFT) calculations revealed that the dual vacancies improved oxygen species mobility and O 2 dissociation, while the co-existing defects and surplus O 2 mitigated the adverse effects of moisture. In situ diffuse reflectance infrared spectroscopy and DFT results indicated that the dual vacancies enhanced styrene activation and maleic anhydride decomposition. Thus, the rate-limiting steps were modified and the reaction process was optimized. This study provides new insights into dual-defect systems and offers a novel approach for designing high-efficiency catalysts for VOC degradation.
研究领域:
材料化学
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环境催化
·
表面科学
·
物理化学
·
纳米催化
·
理论计算化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2021
·
IF 9.676
Zhongyu Pan,Tingting Qin,Wei Zhang,Xianyu Chu,Taowen Dong,Nailin Yue,Zizhun Wang,Weitao Zheng
Aqueous rechargeable magnesium ion batteries (ARMBs) have obtained more attention due to the two-electrons transfer nature, low cost and safety. However, the scarcity of cathode materials seriously hinders the development of ARMBs because of the unfavorable strong interaction between Mg 2+ and cathode material. Herein, we choose a pre-treated spinel Mn 3 O 4 cathode for aqueous Mg 2+ storage. The pre-treatment in Na 2 SO 4 solution induces the grain refinement decorated with tortuous amorphous ion diffusion channels, facilitating the production of electrochemical reaction active sites and the diffusion of Mg 2+ , respectively, which achieve a (sub-)surface pseudocapacitance reaction between Mn (II) and Mn (III). As a result, the pre-treated Mn 3 O 4 cathode exhibits a package of optimal performances, i.e., a capacity of 98.9 mAh g −1 and a high capacity retention rate of 99.4% after 2000 cycles. To the best of our knowledge, our work not only provides a new reaction mechanism of spinel Mn 3 O 4 in aqueous batteries system, but also affords a high cycle stability electrode material for rechargeable Mg 2+ energy storage.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2020
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IF 8.247
Yinfeng Cheng,Baoqiang Li,Zengyan Wei,Yaming Wang,Daqing Wei,Dechang Jia,Yujie Feng,Yu Zhou
Nanostructured metal oxides have shown outstanding promise for electrochemical energy storage , but are usually limited to low rate capability and poor cycling performance caused by irregular shapes and aggregation of nanoparticles at high mass loading (>1 mg cm −2 ). To solve these problems, we report the design of a novel Mn 3 O 4 tetragonal bipyramid laden nitrogen doped and hierarchically porous carbon (Mn 3 O 4 TB/NHPC) composite with higher mass loading (～5 mg cm −2 ) for high-performance energy storage. The homogeneous dispersion of Mn 3 O 4 TBs on NHPC with 3D architecture provides excellent electron transfer , and its hierarchically porous structure with large mesopore volume facilitates rapid ion transport. To achieve wide working potential window, an asymmetric supercapacitor of 1.8 V is assembled with Mn 3 O 4 TB/NHPC composite and NHPC as the positive and negative electrode, respectively. Benefiting from these advantages, the supercapacitor exhibits excellent rate capability (80% of the capacitance retention from 0.5 to 10.0 A g −1 ) and high energy density (34.7 Wh kg −1 at 450 W kg −1 ). More importantly, the assembled device demonstrates a splendid cycling performance (97% capacitance retention after 10000 cycles). Morphology controlled Mn 3 O 4 laden porous carbon composites with remarkable capacitive performance inspire us to develop superior electrode materials for energy storage.
研究领域:
材料科学
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电化学能源存储
✓ 已验证
产品关联
DOI
高影响因子
WATER RESEARCH
·
2023
·
IF 12.8
Yinning He,Jiayi Li,Jingyu Tang,Haijun Cheng,Tao Zeng,Zhiqiao He,Da Wang,Lizhang Wang,Shuang Song,Jun Ma
In this study, N-doped Mn 3 O 4 catalysts (Mn- n N) with electron-dense Mn sites were synthesized and employed in heterogeneous catalytic ozonation (HCO). These catalysts demonstrated excellent performance in pyrazines degradation and odor elimination. The synthesis of Mn- n N was achieved through a facile urea-assisted heat treatment method. Experimental characterization and theoretical analyses revealed that the Mn N structures in Mn- n N, played a crucial role in facilitating the formation of electron-dense Mn sites that served as the primary active sites for ozone activation. In particular, Mn-1N exhibited excellent performance in the HCO system, demonstrating the highest 2,5-dimethylpyrazine (2,5-DMP) degradation efficiency. • OH was confirmed as the primary reactive oxygen species involved in the HCO process. The second-order rate constants for 2,5-DMP degradation with O 3 and • OH, were determined to be (3.75 ± 0.018) × 10 −1 and (6.29 ± 0.844) × 10 9 M −1 s −1 , respectively. Seventeen intermediates were identified through GC-MS analysis during the degradation of 2,5-DMP via HCO process with Mn-1N. The degradation pathways were subsequently proposed by considering these identified intermediates. This study introduces a novel approach to synthesize N-doped Mn 3 O 4 catalysts and demonstrates their efficacy in HCO for the degradation of pyrazines and the elimination of associated odors. The results show that the catalysts are promising for addressing odor-related environmental issues and provide valuable insights about the broader significance of catalytic ozonation processes.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 5
·124163
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IF 7.5
Zhiyun Jiang,Mingjing Ge,Xiaoting Jie,Lixiao Ni,Shiyin Li
Efficient and durable activation of peroxymonosulfate (PMS) for the degradation of persistent organic pollutants remains challenging owing to the instability of active catalytic sites. Here, a Mn 3 O 4 @g-C 3 N 4 heterostructured catalyst (MCN-2) is constructed to enable efficient PMS activation and enhance the generation of non-radicals for rapid bisphenol A (BPA) degradation. MCN-2 preferentially adsorbs the peroxy oxygen atom of PMS, facilitating O-O and O-H bond cleavage to form the high-valent Mn-oxo species (Mn(IV)=O), which further reacts with PMS to yield singlet oxygen ( 1 O 2 ). The resulting 1 O 2 (60.5%) and Mn(IV)=O species (39.5%) synergistically drive rapid non-radical oxidation. Here, Mn 3 O 4 provides catalytic active sites, whereas g-C 3 N 4 enhances adsorption, shortens the mass-transfer distance between BPA and reactive oxygen species (ROS), and functions as an electron reservoir to sustain Mn redox cycling. Consequently, the synergistic 1 O 2 and Mn(IV)=O species system delivers a k-value of 0.258 min −1 for BPA degradation, which is 258 times and 6.45 times higher than that of the g-C 3 N 4 /PMS and Mn 3 O 4 /PMS systems, respectively. Moreover, MCN-2-based catalytic membranes enable stable BPA removal under continuous-flow conditions, and toxicity assessments demonstrate significantly reduced acute toxicity and mutagenicity of the transformation products, highlighting the potential for scalable and environmentally benign water treatment.
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Yingqiang Huang,Haoliang Huang,Qiongzhi Gao,Cuifen Gan,Yingju Liu,Yueping Fang
The two-dimensional sandwich-like Pt/Mn 3 O 4 /reduced-graphene-oxide (RGO) nanocomposites are successfully fabricated through a spontaneous and electroless approach, where Mn 3 O 4 is rationally utilized as a green reducing agent in the synthesis of Pt nanoparticles and also a superior metal oxide support for the growth of Pt nanoparticles. By using X-ray diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy to characterize the catalysts, Pt nanoparticles are found to highly disperse on the Mn 3 O 4 /RGO surface. Electrochemical measurements indicate that the Pt/Mn 3 O 4 /RGO nanocomposites not only possess remarkably excellent long-time stability and electrocatalytic activity toward methanol oxidation, but also reduce the overpotential of methanol oxidation significantly, as compared to the Pt/RGO and the conventional Pt/C catalyst, which could be ascribed to the unique sandwich-like structure and the synergetic interaction formed between Pt, Mn 3 O 4 and RGO . Therefore, the present approach provides some new clues for further development of two-dimensional sandwich-like electrocatalysts for fuel cells.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2014
·
IF 10.211
Shuyan Gao,Keran Geng
Manganese oxide coated with a uniform layer of N-doped carbon (Mn 3 O 4 @CN x ) is readily synthesized using a simple aqueous solution based chelating agent dicyandiamide mediated growth of MnCO 3 followed by calcination at 1000 °C. The Mn 3 O 4 @CN x can provide sufficient effective three-phase interface area due to the unique structures, which plays the important role in the complex three-phase interface electrocatalytic reaction in oxygen reduction reaction . The electron transfer , from the CN x layer to the Mn ions, is supposed to occur and the high positive charge be generated on the Mn 3 O 4 @CN x surface. As a result, these non-precious hybrid materials display an excellent activity for oxygen reduction reaction in terms of electrocatalytic activity , long-term stability, and excellent resistance to crossover effect.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 47
·33463-33470
·
IF 3.9
Ruibin Liang,Si Liu,Jianrong Lin,Jingfei Dai,Jingyi Peng,Peiyuan Huang,Jianwen Chen,Peng Xiao
Mass loading is an important parameter to evaluate the application potential of active materials in high-capacity supercapacitors. Synthesizing active materials with high mass loading is a promising strategy to improve high performance energy storage devices. Preparing electrode materials with a porous structure is of significance to overcome the disadvantages brought by high mass loading. In this work, a Mn3O4/NiMoO4@NiCo layered double hydroxide (MO/NMO/NiCo LDH) positive electrode is fabricated on a carbon cloth with a high mass loading of 20.4 mg cm−2. The MO/NMO/NiCo LDH presents as a special three-dimensional porous nanostructure and exhibits a high specific capacitance of 815 F g−1 at 1 A g−1. Impressively, the flexible supercapacitor based on the MO/NMO/NiCo LDH positive electrode and an AC negative electrode delivers a maximum energy density of 22.5 W h kg−1 and a power density of 8730 W kg−1. It also retains 60.84% of the original specific capacitance after bending to 180° 600 times. Moreover, it exhibits 76.92% capacitance retention after 15 000 charge/discharge cycles. These results make MO/NMO/NiCo LDH one of the most attractive candidates of positive electrode materials for high-performance flexible supercapacitors.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Bei-Lei Yan,Deng Jun,Jun Wang,Tao Yang,Xue-Hua Mao
Based on characteristic multielectron conversion reactions, transition-metal oxides are regarded as potential anode candidates for the new generation of lithium-ion batteries (LIBs) because they are endowed with high specific capacity. Nevertheless, the inferior electronic conductivity and larger volume change lead to fast capacity decay during cycling. Herein, we propose a novel electrophoretic deposition strategy to prepare binder-free Mn 3 O 4 /graphene hybrid electrodes and overcome these two obstacles simultaneously. In the rationally designed structure, Mn 3 O 4 nanoparticles are well encapsulated in the conductive network constructed by interconnected graphene sheets. In the process of cycling, thanks to the excellent flexibility of graphene and the rich voids in this sandwiched structure, not only the structural integrity but also the unobstructed conductive network can be ensured. In addition, it is verified that electrode kinetics is a fast process for surface-controlled lithium storage. From this perspective, in addition to high reversible specific capacity (880 mAh g −1 at 0.1 A g −1 ), the prepared Mn 3 O 4 /graphene hybrid electrode possesses outstanding rate capability (678 mAh g −1 at 5 A g −1 ) and remarkable cycling stability (neglectable capacity decay after 500 cycles at 1 A g −1 ).
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Hongjing Wang,Qiqi Mao,Tianlun Ren,Tongqing Zhou,Kai Deng,Ziqiang Wang,Xiaonian Li,You Xu,Liang Wang
Achieving high efficiency in nitrate (NO3–) to ammonia (NH3) electrocatalysis requires the exploration of advanced electrocatalysts with a well-designed composition and architecture. In this work, a facile one-step hydrothermal approach was developed for the construction of novel Cu/oxygen vacancy-rich Cu-Mn3O4 heterostructured ultrathin nanosheet arrays on Cu foam (Cu/Cu-Mn3O4 NSAs/CF). Two-dimensional ultrathin nanosheet arrays could increase the exposure of catalytically active centers, and the heterogeneous nanointerface and oxygen vacancies synergistically improve the nitrate-to-ammonia activity over the active centers. Due to the desirable compositional and structural advantages, the Cu/Cu-Mn3O4 NSAs/CF demonstrated excellent performance for the electrocatalytic nitrate reduction to ammonia with high ammonia selectivity (87.6%) and Faradic efficiency (92.4%).
研究领域:
材料科学
·
电催化
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Wenjun Le,Zeyi Sun,Tieyan Li,Hao Cao,Chuanxue Yang,Tianxiao Mei,Laihai Zhang,Yibing Wang,Wenwen Jia,Wen Sun,Yihui Hu,Zhongmin Liu
Cell therapy is a promising approach for myocardial infarction (MI) treatment. However, this strategy is often restricted by the harsh microenvironment of MI, such as excess ROS, high oxidative stress, inflammation, etc., and thus decreases the curative effect. Additionally, the distribution, migration, and homing of the transplanted stem cells is ambiguous, which also becomes a bottleneck for clinical translation. To address these challenges, herein, a versatile antioxidant nanozyme is designed by polymerically modifying dopamine (PDA) onto the surface of Mn 3 O 4 . The obtained nanozyme acts as an efficient SOD mimic, eliminating ROS, relieving oxidative stress, and reducing inflammation to improve the MI microenvironment. Simultaneously, Mn 3 O 4 @PDA serves as an excellent MRI contrast agent for tracking MSCs. Then, MSCs are engineered with Mn 3 O 4 @PDA nanozyme via endocytosis to form Mn 3 O 4 @PDA-MSCs (Abbr. E-MSCs), which possess superior viability, migration and homing ability compared to normal MSCs. Furthermore, E-MSCs exhibit superior anti-oxidant and anti-inflammatory activity, thereby enhancing the therapeutic efficacy of MSCs. Finally, the in vivo MRI tracking and synergistic therapy potential of E-MSCs is explored in MI model mice. Overall, this work provides a strategy to combine antioxidant activity and imaging properties of nanozymes to simultaneously facilitate imaging tracking of stem cells and improve MI treatment.
研究领域:
纳米技术
·
干细胞治疗
·
心脏病学
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医学影像
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Biomaterials Science
·
2021
·Vol. 9
·期 7
·2732-2742
·
IF 6.843
Sihan Ji,Yaodong Chen,Xianglong Zhao,Yunyu Cai,Xiaopeng Zhang,Feilong Sun,Qi Chen,Qingmei Deng,Changhao Wang,Kun Ma,Bo Hong,Changhao Liang
The construction of surface structures of manganese oxide nanoparticles (MONs) in order to promote their longitudinal relaxivity r1 to surpass those of commercially available Gd(III) complexes is still a significant challenge. Herein, we successfully obtained Mn3O4/PtOx nanocomposites (NCs) with an r1 of 20.48 mM−1 s−1, four times higher than that of commercially available Gd-DTPA (5.11 mM−1 s−1). The r2/r1 ratio of these NCs is 1.46 lower than that of Gd-DTPA (2.38). This is the first time that such excellent T1 contrast performance has been achieved using MONs via synergistically utilizing the surface morphology and surface payload. These NCs are composed of porous Mn3O4 “skeleton” nanostructures decorated with tiny PtOx nanoparticles (NPs) that are realized using laser ablation and irradiation in liquid and ion etching steps. Experimental results showed that the enlarged specific area of the porous Mn3O4/PtOx NCs and the payload of ultrafine PtOx NPs synergistically facilitated the T1 contrast capabilities. The former favors sufficient proton–electron interactions and the latter reduces the global molecular tumbling motion. These NCs also exhibit an evident computed tomography (CT) attenuation value of 24.13 HU L g−1, which is much better than that achieved using the commercial product iopromide (15.9 HU L g−1). The outstanding magnetic resonance (MR) imaging and CT imaging performances of the Mn3O4/PtOx NCs were proved through in vivo experiments. Histological examinations and blood circulation assays confirmed the good biosafety of the NCs. These novel findings showcase a brand-new strategy for fabricating excellent MON T1 contrast agents (CAs) on the basis of the surface structure and they pave the way for their practical clinical applications in dual-modal imaging.
研究领域:
材料科学
·
医学影像
·
生物医学工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）