INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Zhibo Yan,Yixuan Tao,Guangrui Liu,Jie Yin,Juan Li,Wenpin Wang,Jie Wu,Zhongcheng Li
Suffering from their low conductivity, Mn-base oxides are commonly inactive in H–OH activation. Generally, tailoring the coordinate environment of materials could induce variation in the atomic arrangement and further influence their chemical activity. Herein, we propose a feasible strategy to mediate the electronic structure of Mn-based oxides by facile hydrothermal method and thermal reduction route. Compared with MnO 2 sheets, the as-synthesized Ru/MnO–Mn 7 C 3 /N-doped carbon sheets (Ru/MnO–Mn 7 C 3 /NC) exhibit the higher activity for both acidic (73 mV) and alkaline water reduction reaction (44 mV@10 mA/cm 2 ). Benefitting from unique structures, Ru/MnO–Mn 7 C 3 /NC sheets show the better freshwater/seawater oxidation reactivity, exceeding RuO 2 . The strong interaction of MnO–Mn 7 C 3 heterostructures, Ru, and N-doped carbon endows Ru/MnO–Mn 7 C 3 /NC with the good freshwater and seawater dissociation performance, outperforming most of the reported Mn-based oxides.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Xiang Li,Danwen Guo,Shanying He,Jiahao Kang,Yijuan Zhao,Shaohua Wu,Chunping Yang
Peroxymonosulfate-based advanced oxidation processes (PMS-based AOPs) via nonradical pathways have attracted close attention due to their excellent anti-interference properties and high selectivity in degrading organic pollutants from wastewater. However, the highly efficient production of nonradicals for PMS activation remains challenging, especially for recalcitrant organic pollutants such as tetracycline (TC) in complex aqueous matrices. Here, MnO and nitrogen-doped carbon catalysts were synthesized using NH 4 Cl modified strategy. The performances and mechanisms of TC degradation were evaluated, and toxicity of the system was also assessed. Results showed that the system achieved 86.7 % removal of TC within 30 min with a rate constant of 0.1713 min −1 . This system demonstrated effective TC degradation across a broad pH range (3.0–10.5) while exhibiting resistance to diverse anionic interferences in aqueous matrices. Characterization data showed that NH 4 Cl calcination led to a hierarchical porous structure with optimized MnO dispersion and nitrogen functionality in the carbon support, further significantly enhancing nonradicals generation through PMS activation. The key active sites were identified as Mn-N X sites, graphitic nitrogen, and C-O/C-N groups. Quenching experiments and ESR tests indicated that electron transfer and Mn(V) played the major role in TC degradation, followed by singlet oxygen ( 1 O 2 ). Based on LC-MS analysis of intermediates, three primary TC degradation pathways were identified: hydroxylation-driven ring-opening, oxidative demethylation/deamination, and oxidative ketonization. Toxicity assessment via the Toxicity Estimation Software Tool confirmed a significant reduction in ecotoxicity throughout these pathways. These data could be referred for the optimization of PMS-based AOPs in wastewater treatment.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Fengping Hu,Lin Wei,Jinchang Xu,Zhenyou Wang,Fangming Jiang
Developing robust, multifunctional electrocatalysts is critical for advancing unitized regenerative fuel cells (URFCs) that couple water electrolysis and fuel-cell operation within a single device. We report a nanostructured palladium–manganese dioxide/carbon nanotube (Pd/MnO₂–CNTs) composite in which hollow MnO₂ nanoflowers are uniformly anchored to CNTs, forming a conductive, high–surface area framework that promotes homogeneous Pd dispersion. Comprehensive structural and surface analyses (SEM, TEM, XRD, XPS, and Raman) indicate strong interfacial interactions among Pd, MnO₂, and CNTs, generating abundant defect sites and mixed-oxide bonding that correlate with enhanced catalytic activity and stability. The composite exhibits multifunctional electrocatalysis toward the hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and oxygen reduction reaction (ORR). When integrated into membrane–electrode assemblies, an optimized Pd/MnO₂–CNTs: IrO₂ (1: 9) electrode delivers a roundtrip efficiency of 51.4 ± 0.7 % at 50 mA cm −2 under ambient conditions, together with durable cycling performance. Beyond materials design, we propose a practical protocol for evaluating URFCs under realistic operating constraints, linking electrode composition, interfacial structure, and device-level metrics. This study establishes a scalable route to multifunctional Pd/MnO₂–CNTs catalysts and provides an experimentally grounded framework for benchmarking URFC performance.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
·
2025
·
IF 5.7
You Li,Yunshu Zhang,Zhichao Gan,Lulu Zhan,Yanan Ji,Mengxue Zhou,Yi Lin
Aqueous zinc-ion batteries (AZIBs) promise safe, green and cheap grid storage.Among the cathode candidates, α-MnO₂ is regarded as one of the most promising materials yet they are throttled by poor conductivity.In this work, a microwave-hydrothermal route is adopted to rapidly tailor the crystal orientation and micro-morphology of α-MnO₂, and the correlation between microstructure and ion-diffusion kinetics is systematically investigated. Graphene (Gr) is subsequently introduced to construct a three-dimensional conductive network, which markedly lowers charge-transfer resistance. Quantitative pseudocapacitive analysis further elucidates the underlying energy-storage mechanism. It is revealed that a properly prolonged hydrothermal duration alleviates nanorod aggregation, enlarges the specific surface area, and thus accelerates ion diffusion. Concurrently, the Gr-incorporated architecture enables rapid Zn²⁺/H⁺ transport and endows the composite with superior reaction kinetics. Consequently, a synergistic enhancement in both specific capacity and cycling stability is achieved. This work offers a feasible strategy for the rational design of high-performance Mn-based cathodes.
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Shaowen Dong,Haitao Geng,Wence Yue,Shumin Zheng,Xiaowan Pang,Jie Liang,Gaojun An,Wangliang Li,Bao Wang,Changbo Lu
Lithium-ion batteries (LIBs) have been extensively employed in a range of electrical vehicles and portable devices in virtue of their high energy density and stable cycle life. However, poor performance under low temperatures hinders their application in cold climates and regions. Herein, single-shell (carbon) multiple-core (ultra-small MnO@C nanoparticles) hollow carbon nanospheres (MnO@C@HCS) were prepared by a sacrificial template method, and MnO@C@HCS showed excellent low-temperature electrochemical performance. These MnO@C cores with large surface areas can shorten diffusion lengths of lithium ions and enhance diffusion rates along their rich grain boundaries, enabling rapid charging/discharging. The hollow carbon nanosphere with a porous shell can block serious agglomeration of nanoparticles and regulate the amount of electrolyte filled in the hollow nanosphere to reduce side reactions between highly active electrode materials and electrolytes. The hollow structure formed between the core and the shell mitigates the volume expansion and contraction during cycling. The MnO@C@HCS anode exhibits high specific capacities (1027 mAh g–1 at 0.20 A g–1) and high rate performance (353 mAh g–1 at 10.00 A g–1) under room temperature. Furthermore, the MnO@C@HCS anode maintains a satisfactory discharge capacity under low temperatures (461 mAh g–1 at 0.05 A g–1 under −10 °C, 220 mAh g–1 at 0.10 A g–1 under −20 °C, respectively). The contribution of pseudocapacitance to the capacity decreases as the test temperature drops. Our strategy provides a design concept for the high-performance anode for low-temperature lithium storage.
✓ 已验证
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2018
·
IF 1.686
Bo Long,Xiangyang Zhou,Jingjing Tang,Juan Yang
Graphene encapsulated MnO nanorods , with a diameter of 60–120 nm and length of 1–1.5 μm (MnO@rGO) was synthesized. When evaluated as an anode material for LIBs, the MnO nanorods could not only better accommodate the huge volume change compared with bulk MnO during cycling, but also provide one dimensional charge transportation pathways. Meanwhile, graphene could efficiently alleviate the stress caused by volume change of MnO and improve the electrical conductivity . As a consequence, the as-obtained MnO@rGO hybrid delivers a high reversible capacity of 545 mA h g −1 at 0.5 A g −1 after 150 cycles, demonstrating its promising application in LIBs.
✓ 已验证
DOI
高影响因子
Advanced Healthcare Materials
·
2025
·
IF 9.6
Hua Chai,Renpeng Xia,Nan Ouyang,Jingyu Yao,Jiukun Hu,Minxuan Sun,Peng Miao
Reactive oxygen species (ROS) mediated cell damage is one of the most popular and effective ways for cancer therapy. However, overexpressed antioxidant of reduced glutathione (GSH) is always activated in tumor cells, which maintains redox equilibrium. Attempts to deplete GSH and elevate ROS levels can be potent therapeutic strategies. Herein, tumor cell membrane-encapsulated Fe 3 O 4 @MnO and 2′,3′-cyclic GMP-AMP (cGAMP) are prepared as the nanocatalyst for cancer therapy. The ionized Fe 3+ /Fe 2+ redox couple is utilized to initiate the Fenton reaction. Intracellular GSH level can thus be efficaciously controlled, and peroxide oxidation is catalyzed to produce excessive ROS. Meanwhile, cGAMP is released to trigger the cyclic GMP-AMP synthase (cGAS)-stimulator of interferon genes (STING) signaling axis. This targeted activation enhances the recruitment of macrophages, stimulates the secretion of critical pro-inflammatory cytokines, and consequently bolsters the efficacy of innate immune responses within the tumor microenvironment.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER
·
2021
·
IF 4.43
Wancai Guo,Xutong Guo,Lei Yang,Tianyou Wang,Minghua Zhang,Gaigai Duan,Xianhu Liu,Yiwen Li
Although tremendous efforts have been devoted to manganous oxide (MnO)-based hybrid electrode materials , the rational design and facile preparation of high-performance MnO hybrid supercapacitors are still full of challenges, due to the inevitable agglomeration and limited stability of MnO within carbon matrixes. In this work, we developed a direct one-pot polymerization method to synthesize a series of Mn ion doped polylevodopa [P( L- DOPA)] synthetic melanin nanoparticles (Mn@SMNPs) for further transforming into small-sized hybrid carbon nanoparticles (MnO@CNPs, 20–80 nm) consisting of many stable Mn-related chemical bindings (C–N–Mn). The obtained MnO@CNPs electrode materials with physically spatial protection and well distribution of MnO could display high specific capacitance values (e.g., 545 F g −1 at 0.5 A g −1 in 6 M KOH electrolyte) within a wide operation voltage of 1.3 V. This work will continue to provide an inspiration towards the fabrication of the next-generation of high-performance synthetic melanin-based energy storage materials and devices.
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Jing Lin,Lei Yu,Qujiang Sun,Fangkuo Wang,Yong Cheng,Sheng Wang,Xu Zhang
It is imminently to seek for high energy density in addition to a sensational lifetime of lithium-ion batteries (LIBs) to meet growing requisition in the energy storage application. Anode containing metal oxide composite is being thoroughly investigated for their higher capacity than that of the commercial graphite. A multiporous core-shell structured metal oxide composite anode possessing the excellent capacity and superb lifespan for LIBs is designed. In detail, metal oxide ( i.e., MnO) is encapsulated in N-doped carbon shell (MnO@N–C) via coprecipitation-annealing technique. During annealing, abundant void space among MnO cores/between MnO cores and N–C shells is obtained. This space can efficaciously buffer volume changes of MnO upon cycles. Benefiting from the unique structure and heteroatom doping , the capacity of MnO@N–C microcube anode exhibits 576 mAh g −1 at 5 A g −1 with an ultra-long lifespan more than 3500 cycles. The connection between the electrode characteristics and structure is concurrently examined by adopting kinetic analysis. Finally, a full lithium-ion battery is presented, applying the MnO@N–C (anode) and Nick-rich layered oxide (cathode). It is believed that structural designing with heteroatom doping can be utilized in vaster fields for superior capabilities.
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Yiyang Fan,Xiaoyi Yang,Xin Xu,Tong Shen,Ze Zhang,Fan Wang,Hongzhi Pan,Dong Chang
A CRISPR-responsive DNA hydrogel gates δ-MnO 2 nanozyme release. • RPA–Cas12a recognition enables detection of five common uropathogens. • The assay achieved LODs of 2.44–45.47 copies/μL across targets. • Parallel channels showed specificity, reproducibility, and 20-day stability. • KernelRidge-RBF provided the lowest prediction error among nine evaluated regression models. Urinary tract infection (UTI) requires rapid and accurate pathogen identification, yet conventional culture-based methods are time-consuming and many molecular assays remain dependent on sophisticated instrumentation. Here, we developed a multiplex visual biosensing platform for uropathogen detection by integrating recombinase polymerase amplification (RPA), CRISPR/Cas12a recognition, a CRISPR-responsive DNA hydrogel gate, and a δ-MnO 2 nanozyme-mediated colorimetric module. In this system, target-derived amplicons activate pathogen-specific Cas12a, which degrades the DNA hydrogel and releases encapsulated δ-MnO 2 , thereby catalyzing the TMB/H 2 O 2 reaction to produce a visible and spectrophotometrically measurable signal. The platform was applied to five representative uropathogens, including Escherichia coli , Klebsiella pneumoniae , Pseudomonas aeruginosa , Enterococcus faecium , and Enterococcus faecalis . Under optimized conditions, the assay showed good linearity for all five targets, with R 2 values of 0.9955, 0.9958, 0.9948, 0.9974, and 0.9956, respectively, and limits of detection of 2.60, 3.15, 2.44, 20.40, and 45.47 copies/μL, respectively. The platform also exhibited satisfactory specificity, multiplexing capability, reproducibility, and storage stability. To improve quantitative interpretation, an image-recognition- and machine-learning-assisted workflow was further introduced, in which KernelRidge-RBF showed the best overall performance among the tested models. Clinical urine sample testing further supported the applicability of the platform, with AUC values of 1.000, 0.976, 0.994, 0.947, and 0.939 for the five target pathogens, respectively. Collectively, the RPA-Cas12a-DNA hydrogel-δ-MnO 2 platform enables visual and parallel multi-target detection of uropathogens within approximately 3 h and provides a proof-of-concept framework for the further development of portable nucleic acid biosensors. Download: Download high-res image (194KB) Download: Download full-size image
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Xiaoyan Yuan,Ruiqin Wang,Wenrui Huang,Luo Kong,Shouwu Guo,Laifei Cheng
To enhance microwave loss abilities, constructing composites with one-dimensional (1D) structure is an excellent scheme. In this work, a high-efficiency microwave absorber of MnO nanograins decorated vanadium nitride/carbon nanofibers (MnO-VN/C NFs) was successfully prepared for the first time via co-electrospinning technology and subsequent nitriding treatment. Studying in detail the specific relationship between nitriding time and the morphology of the as-prepared NFs, the precipitations of MnO nanoparticles with tailored structures were attached on the surface of VN/C NFs to optimize their electromagnetic parameters. When the nitriding time was 2.0 h at 600 °C, the MnO-VN/C NFs displayed good microwave absorption performances: the minimum reflection loss (RL) value was −63.2 dB at 8.8 GHz, and the bandwidth of RL < −10 dB was up to 6.4 GHz from 11.6 to 18 GHz at the thickness of 2.8 mm. Meanwhile, the absorption bandwidth (RL< −10 dB) could cover the whole X and Ku band by adjusting the thickness, respectively. The outstanding performances could be attributed to the good impedance matching and various loss pathways including conductive loss and interfacial and dipole polarizations. In these regards, MnO-VN/C NFs are likely to be utilized as a high-efficiency microwave absorber. And the strategy in this work can provide great help to design other 1D structural microwave absorbers with a broader absorbing band.
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Jiawei Wei,Bingqiang Han,Yaowu Wei,Nan Li,Yilong Wang,Junlong Duan,Jiali Fu
In this paper, the influence of the CaO, MnO and Cr 2 O 3 on the decomposition mechanism, sintering process and properties of zircon ceramics were studied. The X-ray diffraction (XRD), microstructure, pore characteristics and densification behaviour were used to evaluate the decomposition mechanism and the properties of the zircon ceramics. The results indicated that the addition of CaO could accelerate the decomposition rate of zircon by the formation of the solid solution, which caused the appearance of the large pores to weaken the properties. Cr 2 O 3 could limit the sintering process, decomposition reaction and grain growth of zircon to degrade the performance of the zircon ceramics. The addition of MnO promoted the grains growth and had no effect on the decomposition of zircon by the formation of solid solution. Thus, the zircon ceramics with MnO rendered an optimal bulk density and an apparent porosity of 3.53 g/cm 3 and 22.5%, a high compressive strength of 212.6 MPa sintered at 1550 °C.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）