JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Yuantao Li,Jiajun Zhu,Jiyang Xie,Yongyun Mao,Wanbiao Hu
Constructing three-dimensional (3D) hierarchical bimetallic pseudocapacitive materials with abundant opening channel and heterojunction structures is rather promising but still challenging for high-performance supercapacitors. Herein, a self-sacrifice-template epitaxial growth strategy was proposed for the first time to construct 3D hierarchical bimetallic pseudocapacitive material. By using this strategy, NiCo 2 O 4 nanowires (NiCo 2 O 4 NW) arrayed randomly to form a porous shell via in-situ epitaxial growth fully enclosing a MnO 2 tube core, forming multiple transport channels and nano-heterojunctions between MnO 2 and NiCo 2 O 4 NW, which facilitates electron transfer, i.e. exhibiting high electronic conductivity than any single component. As a result of the self-sacrifice-template epitaxial growth method, special hollow tectorum-like 3D hierarchical structure with considerable inter-nanowire space and hollow interior space enables easy access of electrolyte to NiCo 2 O 4 NW surface and MnO 2 core, thereby resulting in highly exposed redox active sites of MnO 2 core and NiCo 2 O 4 NW shell for energy storage. Comprehensive evaluations confirmed MnO 2 @NiCo 2 O 4 NW was a supercapacitor electrode candidate, delivering a superior energy density of 106.37 Wh kg −1 . Such performance can be ascribed to the synergistic coupling effect of 3D hierarchical tube and nano-heterojunction structures. The proposed self-sacrifice-template epitaxial growth strategy provides important guidance for designing high-performance energy storage materials.
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高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 14
·2138
·
IF 5.3
Yanyun Cui,Jun Zhao,Huidan Li
Alkaline phosphatase (ALP) is among the most studied enzymes by far, playing an important role in the metabolism of organisms and the regulation of protein activity. Herein, a label-free composite nanoprobe is constructed by combining inorganic nanomaterials and aggregation-induced emission (AIE) molecule to achieve highly sensitive and selective detection of ALP. Negatively charged 9,10-bis [2-(6-sulfonatopropoxyl) naphthylethenyl] anthracene (BSNVA) molecule is synthesized, which has the AIE performance and can be assembled on the surface of amino–SiO2nanoparticles through electrostatic interaction for fluorescence enhancement. MnO2nanosheets are rich in negative charges, enabling them to be wrapped on the surface of the amino–SiO2nanosphere to shield the positive charge on its surface, making it impossible for BSNVA to accumulate on the surface and then weakening the bio-fluorescence of the system. Furthermore, with catalyzed substrates induced by ALP, generating ascorbic acid and the redox reaction between ascorbic acid and MnO2, the nanoprobe helps in realizing the high-sensitivity detection of ALP with a detection limit of 0.38 mU/mL. The proposed strategy requires no complex cleaning and modification processes and can overcome the quenching effect caused by the aggregation of traditional organic dyes, proving to be a simple, low-cost and “turn-on” fluorescent detection method for ALP.Keywords:aggregation-induced emission;fluorescence sensor;alkaline phosphatase;SiO2nanospheres;MnO2nanosheet
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CATALYSIS LETTERS
·
2023
·
IF 2.8
Gao Youxin,Zhou Aojia,Min Jie,Yu Chengbing
A simple redox method was used to synthesize δ-MnO 2 and introduce the first main group metal elements between the layers of δ-MnO 2 . Through testing, we found that δ-MnO 2 doped with Rb + demonstrated the best catalytic performance for formaldehyde removal. Under the condition of 36 °C and the initial formaldehyde concentration of 200 ppm, a 200 mg of Rb-MnO 2 could achieve the percentage of removal of formaldehyde 97.48%. We found that doping elements with low electronegativity and large ion radius could weaken the Mn–O bond, which is conducive to the formation of reactive oxygen species and improve the performance of catalytic oxidation. Graphical Abstract
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Advanced Healthcare Materials
·
2023
·
IF 10
Yi Lu,Xinni Pan,Cheng Cao,Shanshan Fan,Haisong Tan,Shengsheng Cui,Yanlei Liu,Daxiang Cui
As one of the most widely used drugs, acetaminophen, is the leading cause of acute liver injury. In addition, acetaminophen-induced liver injury (AILI) has a strong relationship with the overproduced reactive oxygen species, which can be effectively eliminated by nanozymes. To address these challenges, mesoporous PdPt@MnO 2 nanoprobes (PPM NPs) mimicking peroxide, catalase, and superoxide dismutase-like properties are synthesized. They demonstrate nontoxicity, high colloidal stability, and exceptional reactive oxygen species (ROS)-scavenging ability. By scavenging excessive ROS, decreasing inflammatory cytokines, and inhibiting the recruitment and activation of monocyte/macrophage cells and neutrophils, the pathology mechanism of PPM NPs in AILI is confirmed. Moreover, PPM NPs’ therapeutic effect and good biocompatibility may facilitate the clinical treatment of AILI.
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Nanoscale
·
2023
·Vol. 15
·期 18
·8255-8269
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IF 6.7
Huanhuan Wang,Qi Qu,Jiangshan Gao,Yan He
Herein, Fe3O4@MnO2@Ni–Co/C composites derived from PBAs were successfully fabricated. Firstly, Ni–Co Prussian blue analogues (Ni–Co PBAs) were used as precursors to derive a carbon layer on their surface by annealing treatment and subsequently translated into MnO2@Ni–Co/C nanocubes after hydrothermal reactions. Fe3O4@MnO2@Ni–Co/C composites were finally obtained after depositing Fe3O4 nanoparticles through the annealing process. Their electromagnetic wave (EMW) absorption performance apparently enhanced, thanks to the excellent impedance matching and strong attenuation derived from the synergy between the dielectric loss and the magnetic loss. In particular, the minimum reflection loss (RLmin) of Fe3O4@MnO2@Ni–Co/C reached −41.2 dB with a thickness of 4.0 mm and the effective absorption bandwidth (EAB) reached 7.1 GHz with a thickness of 2.0 mm. Therefore, the results could be significant for synthesizing EMW absorbers with excellent performance, a broad bandwidth, strong absorption, thin thickness and light weight.
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Nanomaterials
·
2023
·Vol. 13
·期 4
·775
·
IF 5.3
Hong Su,Jiangping Liu,Yanan Hu,Tianhao Ai,Chenhao Gong,Jichang Lu,Yongming Luo
As a representative sulfur-containing volatile organic compounds (S-VOCs), CH3SH has attracted widespread attention due to its adverse environmental and health risks. The performance of Mn-based catalysts and the effect of their crystal structure on the CH3SH catalytic reaction have yet to be systematically investigated. In this paper, two different crystalline phases of tunneled MnO2(α-MnO2and β-MnO2) with the similar nanorod morphology were used to remove CH3SH, and their physicochemical properties were comprehensively studied using high-resolution transmission electron microscope (HRTEM) and electron paramagnetic resonance (EPR), H2-TPR, O2-TPD, Raman, and X-ray photoelectron spectroscopy (XPS) analysis. For the first time, we report that the specific reaction rate for α-MnO2(0.029 mol g−1h−1) was approximately 4.1 times higher than that of β-MnO2(0.007 mol g−1h−1). The as-synthesized α-MnO2exhibited higher CH3SH catalytic activity towards CH3SH than that of β-MnO2, which can be ascribed to the additional oxygen vacancies, stronger surface oxygen migration ability, and better redox properties from α-MnO2. The oxygen vacancies on the catalyst surface provided the main active sites for the chemisorption of CH3SH, and the subsequent electron transfer led to the decomposition of CH3SH. The lattice oxygen on catalysts could be released during the reaction and thus participated in the further oxidation of sulfur-containing species. CH3SSCH3, S0, SO32−, and SO42−were identified as the main products of CH3SH conversion. This work offers a new understanding of the interface interaction mechanism between Mn-based catalysts and S-VOCs.Keywords:CH3SH decomposition;MnO2;oxygen vacancies;oxygen migration
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2023
·
IF 6.9
Menghan Tian,Xueqing Liu,Xungang Diao,Xiaolan Zhong
The conductive polymer polyaniline (PANI) has attracted much attention in the field of electrochromic energy storage device (EESD) due to its rich color changes and good pseudocapacitive properties, however, the operating voltage window and cycling stability of PANI material, as an essential part in the full electrochromic devices , has failed to be fully explored and employed. Herein, we synthesized the PANI and MnO 2 nanocomposite structure via robust one-step electrodeposition approach, forming an intriguing architecture similar to the coral-like nano-porous. The rougher coral-like structure provides a great quantity nano porous ion transport channel, which greatly improves the working voltage range and cycling stability of the electrode, and shows great potential as an anode electrode for EESDs. In addition, we built a complementary full EESD prepared with tungsten oxide (WO 3 ) as the counter electrode, which has both electrochromic and energy storage dual function integration, allowing real-time observation of the EESD operating state based on color change. It can work stably under a large voltage window of -2V–1.5V, with good bistable performance, fast response speed and more than 1000 times electrochemical cycle life. This work provides a new opportunity to design next-generation high-performance and intelligent hybrid energy storage system for consumer electronics.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Jin Li,Xiao-Peng Liu,Wen-Qi Ye,Zhang-Run Xu
Alkaline phosphatase (ALP), as a crucial enzyme involved in many physiological activities, is always used as one of the significant biomarkers in clinical diagnosis. Herein, a novel, simple, and effective photothermal quantitative method based on the etching of MnO 2 -coated gold nanoparticles ( [email protected] 2 NPs) was established for ALP activity assay with a household thermometer-based visual readout. The photothermal effect of [email protected] 2 NPs is much higher than that of MnO 2 NPs or Au NPs. The MnO 2 shell of [email protected] 2 NPs can be etched by ascorbic acid , a product of ALP-catalyzed hydrolysis of 2-phospho- l -ascorbic acid. With the etching of [email protected] 2 NPs, the photothermal conversion efficiency decreased gradually, causing the decrease of the temperature increment of the solutions by degrees. A household thermometer, instead of large-scale and professional instruments, was used as a signal reader to realize the visual quantitative detection. The photothermal platform was used successfully for the determination of ALP with a wide linear range from 2.0 to 50 U/L and a detection limit as low as 0.75 U/L. Moreover, the inhibition efficiency of sodium vanadate for ALP activity was investigated, proving the photothermal quantitative method will be a potential platform for screening enzyme inhibitors . Such a sensitive, facile, and low-cost sensing assay provides a new prospect to develop platforms for point-of-care testing.
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Small
·
2022
·Vol. 18
·期 49
·2204484
·
IF 15.153
Yibo Chen,Zhi-Han Zuo,Zhao-Qing Liu,Yadong Yin
Drop-casting manganese oxide (MnO 2 ) hollow nanospheres synthesized via a simple surface-initiated redox route produces thin films exhibiting angle-independent structural colors. The colors can rapidly change in response to high-humidity dynamic water vapor (relative humidity > 90%) with excellent reversibility. When the film is triggered by dynamic water vapor with a relative humidity of ≈100%, the color changes with an optimal wavelength redshift of ≈60 nm at ≈600 ms while there is no shift under static water vapor. The unique selective response originates from the nanoscale porosity formed in the shells by randomly stacked MnO 2 nanosheets, which enhances the capillary condensation of dynamic water vapor and promotes the change of their effective refractive index for rapid color switching. The repeated color-switching tests over 100 times confirm the durability and reversibility of the MnO 2 film. The potential of these films for applications in anti-counterfeiting and information encryption is further demonstrated by reversible encoding and decoding initiated exclusively by exposure to human breath.
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Membranes
·
2022
·Vol. 12
·期 11
·1044
·
IF 4.562
Tingting Liu,Lei Chen,Ling Chen,Guoxing Tian,Mingtong Ji,Shuai Zhou
In this paper,δ-MnO2with layered structure was prepared by a facile liquid phase method, and exfoliated MnO2nanosheet (e-MnO2) was obtained by ultrasonic exfoliation, whose surface was negatively charged. Then, positive charges were grafted on the surface of MnO2nanosheets with a polycation electrolyte of polydiallyl dimethylammonium chloride (PDDA) in different concentrations. A series of e-MnO2@reduced graphene oxide (rGO) composites were obtained by electrostatic self-assembly combined with hydrothermal chemical reduction. When PDDA was adjusted to 0.75 g/L, the thickness of e-MnO2was ~1.2 nm, and the nanosheets were uniformly adsorbed on the surface of graphene, which shows layer-by-layer morphology with a specific surface area of ~154 m2/g. On account of the unique heterostructure, the composite exhibits good electrochemical performance as supercapacitor electrodes. The specific capacitance of e-MnO2-0.75@rGO can reach 456 F/g at a current density of 1 A/g in KOH electrolyte, which still remains 201 F/g at 10 A/g. In addition, the capacitance retention is 98.7% after 10000 charge-discharge cycles at 20 A/g. Furthermore, an asymmetric supercapacitor (ASC) device of e-MnO2-0.75@rGO//graphene hydrogel (GH) was assembled, of which the specific capacitance achieves 94 F/g (1 A/g) and the cycle stability is excellent, with a retention rate of 99.3% over 10000 cycles (20 A/g).Keywords:MnO2;reduced graphene oxide (rGO);layer-by-layer;supercapacitor
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Qinghe Liu,Sen Wang,Fei Han,Shupei Lv,Zairong Yan,Yunfei Xi,Jing Ouyang
Highly efficient three-dimensional (3D) kaolinite/MnO2–CuO (KM@CuO–NO3) catalysts were synthesized by a mild biomimetic strategy. Kaolinite flakes were uniformly wrapped by ultrathin tremelliform MnO2 nanosheets with thicknesses of around 1.0–1.5 nm. Si–O and Al–O groups in kaolinite hosted MnO2 nanosheets to generate a robust composite structure. The ultrathin MnO2 lamellar structure exhibited excellent stability even after calcination above 350 °C. Kaolinite/MnO2 exhibited abundant edges, sharp corners, and interconnected diffusion channels, which are superior to the common stacked structure. Open channels guaranteed fast transportation and migration of CO and O2 during CO oxidation. The synthesized KM@CuO–NO3 achieved a 90% CO conversion efficiency at a relatively low temperature (110 °C). Furthermore, the abundant oxygen vacancies on KM@CuO-NO3 assisted the adsorption and activation of oxygen species and thus enhanced the oxygen mobility and reactivity in the catalytic process. The mechanism results suggest that CuO introduced to the catalyst not only acted as CO active sites but also weakened the Mn–O bond, subsequently improved the mobilities of the oxygen species, which was found to contribute to its high activity for CO oxidation. This study provides new conceptual insights into rationally regulating structural assembly between transition metal oxides and natural minerals for high-performance catalysis reactions.
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Journal of Water Process Engineering
·
2022
·
IF 7.34
Xingyu Fang,Ying Wu,Lijie Xu,Lu Gan
In this study, a series of coconut shell biochars (CSB) with different pyrolysis temperature were prepared and incorporated with α-MnO 2 for bisphenol A (BPA) degradation in water through activating peroxymonosulfate (PMS). The results showed that with the assistance of CSB, α-MnO 2 /CSB exhibited superior catalytic activity over pristine α-MnO 2 , in which CSB played multiple roles in the composite. Basically, CSB could effectively improve the dispersion and expose more active sites of α-MnO 2 . Besides, CSB could build solid interactions with α-MnO 2 and boost the electron transferring rate between catalyst, PMS and BPA. Moreover, α-MnO 2 and CSB were both enrolled in the generation of radical and non-radical species for BPA degradation. Having multiple active species, the α-MnO 2 /CSB composite could maintain high catalytic performance under a wide pH range with good reusability and adaptability. The existence of both radical and non-radical pathways was further verified through identifying the BPA degradation intermediates. This study provides a new insight for the design of novel composite catalyst for water decontamination using biochar as a multifunctional participant.
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