ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Xinrui Song,Jiaming Wen,Xiaohua Li,Jizhao Zou,Chaobo Yan,Xierong Zeng
The commercial applications of lithium metal anodes are still hindered by safety concerns resulting from uncontrollable lithium dendrite growth and serious volume changes during the discharge and charge processes. In this study, N-rich hollow porous carbon nanofibers decorated with various zinc oxide morphologies as the lithiophilic phase are fabricated through simple coaxial-electrospinning. The ZnO nanostructure gradually changes from small nanoparticles to needle-like structures with increasing Zn(Ac) 2 fraction, resulting in lithiophilic to lithiophobic scaffold transfer, owing to current density concentration, long Li ion diffusion distances, and inhomogeneous Li deposition behavior with ZnO needle-like shapes. The small ZnO nanoparticles on the NHCNF as the Li metal deposition scaffold also efficiently reduce the local current density and guide the Li ions to homogenously nucleate and deposit. The hollow porous structure provides ultra-high Li metal space accommodation, which can prevent uncontrollable Li dendrite growth. These excellent scaffold characteristics display a high Columbic efficiency of 97% after 150 cycles at 1 mA cm −2 and a stable cyclic lifespan of 1000 cycles in the symmetrical cells, even at a super high current density of 5 mA cm −2 on the 5-ZnO@NHCNF/Li composite anode, full cells coupled with an LiFePO 4 commercialized cathode deliver excellent cyclic and rate performance.
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SENSORS
·
2022
·Vol. 23
·期 1
·91
·
IF 3.847
Yanlu Chen,Xinxin Pu,Xinyu Xu,Menghan Shi,Hui-Jun Li,Ding Wang
The traditional self-supported piezoelectric thin films prepared by filtration methods are limited in practical applications due to their poor tensile properties. The strategy of using flexible polyethylene terephthalate (PET) fabric as the flexible substrate is beneficial to enhancing the flexibility and stretchability of the flexible device, thus extending the applications of pressure sensors. In this work, a novel wearable pressure sensor is prepared, of which uniform and dense ZnO nanoarray-coated PET fabrics are covered by a two-dimensional MXene nanosheet. The ternary structure incorporates the advantages of the three components including the superior piezoelectric properties of ZnO nanorod arrays, the excellent flexibility of the PET substrate, and the outstanding conductivity of MXene, resulting in a novel wearable sensor with excellent pressure-sensitive properties. The PET/ZnO@MXene pressure sensor exhibits excellent sensing performance (S = 53.22 kPa−1), fast response/recovery speeds (150 ms and 100 ms), and superior flexural stability (over 30 cycles at 5% strain). The composite fabric also shows high sensitivity in both motion monitoring and physiological signal detection (e.g., device bending, elbow bending, finger bending, wrist pulse peaks, and sound signal discrimination). These findings provide insight into composite fabric-based pressure-sensitive materials, demonstrating the great significance and promising prospects in the field of flexible pressure sensing.Keywords:flexible pressure sensors;MXene;pressure-sensitive;ZnO nanoarrays
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INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
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2023
·
IF 5.1
Y.J. Xu,Y. Ma,Y.C. Xie,Y. Zhou,H. Zhang,G.Y. Huang
Aramid fabrics are widely used for human protection due to their high strength and softness. Recent studies have shown that growing ZnO nanoparticles on fibers improves the mechanical properties of the fabrics. In this work, the process for preparation of ZnO-modified aramid fabrics was optimized. The mechanical properties and interyarn friction of ZnO-modified fabrics increased with increasing concentration of preparation solution and upon addition of coupling agent. The ballistic properties of the ZnO-modified fabric were improved compared with those of unmodified fabric. In particular, Z2 fabric (with added coupling agent) showed the best ballistic performance based on areal density. The ballistic limiting velocities of the single-layer, 2-layer, and 3-layer Z2 fabrics were 109.1%, 98.3%, and 67.8% higher than that of unmodified fabric, and the areal density was only increased by 8.2%. Compared with 2-layer and 3-layer unmodified fabrics, the ballistic limiting velocities of single-layer and 2-layer Z2 fabric were increased by 16% and 35.6%, respectively, and the areal densities were reduced by 45.9% and 27.9%. The results of simulations and ballistic tests were consistent, indicating that ZnO modification improved the ballistic performance of the fabrics by increasing interyarn friction and tensile properties of the fabric.
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RSC Advances
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2022
·Vol. 12
·期 52
·34107-34116
·
IF 4.036
Chuanfeng Zang,Hao Chen,Xiangye Han,Wei Zhang,Junfang Wu,Fanghua Liang,Jiamu Dai,Hongchao Liu,Guangyu Zhang,Ke-Qin Zhang,Mingzheng Ge
PVDF/ZnO/CuS photocatalysts with ZnO/CuS heterojunctions were synthesized via electrospinning, hydrothermal, and ion-exchange techniques. As matrix materials, electrospun PVDF nanofibers are easy to be recycled and reused. ZnO nanorods anchored on PVDF nanofiber with high specific surface area provide abundant active reaction sites for photocatalysis. While the loaded CuS nanoparticles as a photosensitizer compensate the low quantum efficiency of ZnO and improve the visible-light photocatalytic efficiency. As a result, the PVDF/ZnO/CuS composited photocatalyst exhibits outstanding photocatalytic performance in exposure to UV and visible light owing to the suppressed recombination of electron–hole pairs and widened visible light absorption range. The kinetic constants of PVDF/ZnO/CuS nanocomposites under UV irradiation (9.01 × 10−3 min−1) and visible light (6.53 × 10−3 min−1) irradiation were 3.66 and 2.53 times higher than that of PVDF/ZnO (2.46 × 10−3 min−1 & 2.58 × 10−3 min−1), respectively. Furthermore, PVDF/ZnO/CuS nanocomposites demonstrate excellent robustness in terms of recycling and reuse, which is advantageous in practical applications.
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Journal of Advanced Ceramics
·
2022
·Vol. 11
·期 12
·1932-1943
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IF 11.534
Fan Shengjie,Sun Tingting,Jiang Meng,Gu Shijia,Wang Lianjun,Yan Haixue,Jiang Wan
As a high-temperature thermoelectric (TE) material, ZnO offers advantages of non-toxicity, chemical stability, and oxidation resistance, and shows considerable promise as a true ready-to-use module under air conditions. However, poor electrical conductivity and high thermal conductivity severely hinder its application. Carbon nanotubes (CNTs) are often used as a reinforcing phase in composites, but it is difficult to achieve uniform dispersion of CNTs due to van der Waals forces. Herein, we developed an effective in-situ growth strategy of homogeneous CNTs on ZnO nanoparticles by exploiting the chemical vapor deposition (CVD) technology, in order to improve their electrical conductivity and mechanical properties, as well as reducing the thermal conductivity. Meanwhile, magnetic nickel (Ni) nanoparticles are introduced as catalysts for promoting the formation of CNTs, which can also enhance the electrical and thermal transportation of ZnO matrices. Notably, the electrical conductivity of ZnO is significantly boosted from 26 to 79 S·cm −1 due to the formation of dense and uniform conductive CNT networks. The lattice thermal conductivity ( κ L ) is obviously declined by the intensification of phonon scattering, resulting from the abundant grain boundaries and interfaces in ZnO-CNT composites. Importantly, the maximum dimensionless figure of merit ( zT ) of 0.04 at 800 K is obtained in 2.0% Ni-CNTs/ZnO, which is three times larger than that of CNTs/ZnO prepared by traditional ultrasonic method. In addition, the mechanical properties of composites including Vickers hardness ( HV ) and fracture toughness ( K IC ) are also reinforced. This work provides a valuable reference for dispersing nano-phases in TE materials to enhance both TE and mechanical properties.
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Solar RRL
·
2023
·Vol. 7
·期 7
·2201093
·
IF 7.9
Xiaohong Ma,Danyang Li,Jun Xie,Jian Qi,Huacheng Jin,Liuyang Bai,Hao Zhang,Feifei You,Fangli Yuan
The reduction of CO 2 to chemical fuel driven by solar energy can not only meet the growing demand for renewable energy, but also balance the carbon cycle in nature. However, the current photocatalysts have low CO 2 conversion due to their poor light capture ability, narrow light response range, and high recombination probability of photogenerated carriers. Herein, a heterogeneous photocatalyst of hollow structured ZnO/ZnS decorated with Pt nanoparticles is synthesized through the hydrothermal process and photodeposition method, showing excellent photocatalytic activity for CO 2 reduction in long-time stability and ≈100% CO selectivity, which can mainly contribute to natural enhanced light-capture ability of the hollow confined space due to multiple reflection and scattering of light in the cavity, thus improving separation efficiency of photogenerated charge carriers due to the type II junction constructed between ZnO and ZnS and the additional reaction active sites after decorating Pt nanoparticles in the surface of the hollow structure.
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DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Yin Zhang,Yanping Huang,Bingqun Lin,Zupeng Chen,Xinwu Xu,Mingzhu Pan
Photocatalytic degradation is an eco-friendly technology for volatile organic compound (VOC) removal, but searching for a highly efficient photocatalyst system remains a challenge. Here, a novel photocatalyst , ZnO/Ti 3 C 2 T X composite, was developed by the electrostatic deposition strategy, wherein Ti 3 C 2 T X nanosheets serve as a support to provide abundant surface-active sites for loading ZnO spheres and adsorbing VOC molecules. Furthermore, successive catalytic centers are formed to enlarge the photocatalytic reaction interface , thereby minimizing the photogenerated electron transfer distances. Moreover, a Schottky heterojunction was successfully formed between the ZnO spheres and Ti 3 C 2 T X nanosheets , which further suppressed the recombination of photogenerated electron–hole pairs. As a result, the ZnO/Ti 3 C 2 T X composite exhibited enhanced photocatalytic activity , universality and stability in VOCs degradation. The photodegradation efficiencies of formaldehyde, methyl alcohol and acetone were as high as 91 %, 84 % and 80 % by ZnO/Ti 3 C 2 T X composite, respectively. The pseudo-first-order kinetic constant of formaldehyde decomposition on ZnO/Ti 3 C 2 T X was 2.69 times greater than that on pristine ZnO. This work presents a novel photocatalyst system of ZnO/Ti 3 C 2 T X composite and provides an insight for the development of highly efficient photocatalysts for the degradation of VOCs.
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APPLIED CLAY SCIENCE
·
2023
·
IF 5.6
Han Liang,Huiyan Wang,Xuemei Sun,Wang Xu,Na Meng,Ninglin Zhou
Nanocomposites are effective methods for the treatment of microbial infections. In this work, zinc oxide nanoparticles and silver nanoparticles were synthesized by a simple and mild method, and successfully loaded on polydopamine-modified montmorillonite (PDA Mt) to prepare nanocomposites (ZnO/Ag/PDA-Mt) with potent antibacterial ability. The transmission electron microscope (TEM) showed that the nanoparticles in ZnO/Ag/PDA-Mt were quasi-spherical, and the particle size ranged from 5 nm to 45 nm. The energy dispersive spectroscopy (EDS)-mapping verified the presence of Zn, Ag, O, Al, Si and C elements in the synthesized ZnO/Ag/PDA-Mt. In addition, the antimicrobial activity of ZnO/Ag/PDA-Mt was also tested against Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ). Due to the synergistic antibacterial effect between zinc oxide nanoparticles and silver nanoparticles, ZnO/Ag/PDA-Mt exhibited higher antiseptic activity than silver nanoparticles supported polydopamine-modified montmorillonite (Ag/PDA-Mt) and zinc oxide nanoparticles supported polydopamine-modified montmorillonite (ZnO/PDA-Mt). The biocompatibility of ZnO/Ag/PDA-Mt was evaluated by cytotoxicity assay. The results demonstrated that the ZnO/Ag/PDA-Mt nanocomposites have potential for antibacterial applications.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Chongjun Huang,Meng Xiao,Hao Cui,Jiayin Wang,Yurou Cai,Yu Ke
Antibacterial sodium carboxymethyl cellulose (CMC) gels were prepared via immobilizing ZnO and/or Ag/AgCl in situ to inhibit the aggregation of nano-photocatalyst. Epichlorohydrin was used as a crosslinking agent to prepare CMC gel, simultaneously introducing chlorine-containing branch chains as Cl reservoir to deposit AgCl. The composite gels presented pH responsive swelling properties, with the minimum swelling ratio at pH 8 and pH 4 for CMC gels containing Ag/AgCl and ZnO, respectively. Zn 2+ release from the nanocomposite gels was much greater in acidic than in neutral. Photocatalytic degradation constants of methyl orange by the composite gels under sunlight were greater than UV irradiation. Ag/AgCl loaded gel showed a degradation rate of 71.3 % under sunlight for 1 h, with a rate constant approximately 10.2 times higher than ZnO loaded gel. Extract liquids with the gel content below 0.33 mg/mL were noncytotoxicity. The nanocomposite gels presented good bactericidal rate against E. coli and S. aureus under sunlight for 6 h, comparatively to those in dark for 24 h. Bacteriostatic activity of Ag/AgCl loaded gel under sunlight for 6 h was much greater than that in dark for 24 h. The biocompatible nanocomposite gels with sunlight-catalyzed antibacterial activity would broaden the application of CMC gels.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Danyang Li,Hongpeng Zhang,Songze Xie,Hao Zhang,Huan Wang,Xiaohong Ma,Dawei Gao,Jian Qi,Feifei You
It is a promising strategy to effectively promote “carbon neutrality” by reducing CO2 to small energy molecules through photocatalysis technology. However, due to low light utilization and recombination of photogenerated carriers, photocatalysts usually have low activity and low selectivity for products. Herein, a hollow spherical ZnS/ZnO heterojunction with a spatial confinement effect photocatalyst was synthesized toward CO2 photoreduction through preciously controlling the nano-/microstructure. The local lattice distortions were introduced into the surface of the hollow ZnS/ZnO microsphere, which activated lattice oxygen and provided additional active reaction sites. Furthermore, the heterojunction constructed between ZnS and ZnO interfaces facilitated the separation of photoinduced charge carriers. Combined with the natural advantage of enhanced light capture and absorption for a hollow confined structure, as a result, the systemic design in the electronic and confined structures for the photocatalyst has brought an excellent CO2 reduction performance with a CO yield rate as high as 35.85 μmol g–1h–1 and durability under a 300 W Xe lamp irradiation without any sacrificial agent and cocatalyst.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yining Zhang,Mengyang Xu,Weiqiang Zhou,Xianghai Song,Xin Liu,Jisheng Zhang,Songtao Chen,Pengwei Huo
Step-scheme (S-scheme) heterojunctions can efficiently promote the separation of photogenerated carriers while maintaining the strong oxidation/reduction ability of photocatalysts; thus, research attention on S-scheme heterojunctions is increasing year by year. In this study, the S-scheme ZnO@ZnIn 2 S 4 (ZnO@ZIS) heterojunction was prepared successfully. Then, electron spin resonance (ESR) characterization was applied to prove the successful construction of the S-scheme heterojunction. Photoluminescence (PL), time-resolved photoluminescence (TRPL), and photoelectrochemical experiments have demonstrated efficient interfacial charge transport in ZnO@ZIS. Finally, the mechanism of CO 2 activation and electron transport was investigated by in situ Fourier transform infrared spectroscopy (FT-IR) and discrete Fourier transform (DFT) calculation analysis. The 40-ZnO@ZIS composite showed the best activity under light, and its CO and CH 4 yields reached 39.76 and 3.92 μmol∙g −1 ∙h −1 , respectively. This study provides a solution for optimizing the photocatalytic reduction activity of semiconductor photocatalysts by constructing S-scheme heterojunction materials to improve the CO 2 reduction capacity.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Wang Yanan,Zhao Fei,Zhang Meng,Chen Gang,Wang Xiao,Ma Yan,Ruan Weidong,Zhang Houyu,Zhao Bing
The use of doped semiconductors to achieve plasmonic frequencies in the middle infrared (mid-IR) has been recently proposed as a promising way to obtain high-quality and tunable plasmonic materials . Plasmonic materials have great static or dynamic tunability. In some cases, choosing a dopant over another is an important trade-off to optimize the plasmonic performance. In this work, trivalent metal ion (M)-doped ZnO nanoparticles (NPs, M=Al, In) were successfully synthesized with highly consistent synthesis conditions. Interestingly, surface plasmon resonance (SPR) can only be observed in Al-doped ZnO (AZO) NPs, but not in In-doped ZnO (IZO) NPs. We used X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman and a first principle calculation to clarify the proper dopant sites (replaceable or interstitial doping) of Al 3+ and In 3+ in the host nanocrystals of ZnO. In addition, these results assisted by density of states (DOS) analysis indicate that different doping modes influenced the electronic structures in different degrees, and may lead to the opposite SPR phenomenon. Our work deepens the understanding of the relationship between doping sites in the host nanocrystals and SPR properties and give important guidance to the develop the doped semiconductors with plasmonic performance.
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