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Rechargeable aqueous Zn metal batteries (AZMBs) are desirable because of the advantages of metallic Zn and aqueous media. However, AZMBs suffer from limited cyclability and low Coulombic efficiency, originating from uncontrolled dendrite growth and side reactions such as hydrogen gas evolution and corrosion. A hierarchically porous poly(vinylidene difluoride) (PVDF) protection layer with ferroelectric β-phases is formed on the Zn metal using a simple electrospinning method. This suppresses Zn metal failure modes such as side reactions and dendrite growth and supports rapid electrolyte accessibility. The synergetic effect of hierarchically porous structures and ferroelectricity not only facilitates a supporting matrix to form uniform nucleation sites for Zn deposition but also inhibits corrosion, allowing dendrite-free Zn deposition. This multifunctional PVDF film significantly improves the cyclability of Zn symmetric cells, allowing for up to 850 h of repeated plating/stripping cycles. Moreover, it exhibits an excellent cycle life of 1000 cycles under harsh conditions and high current densities of 4.0-10.0 mA cm, which are 62-fold higher than those that the bare Zn electrode tolerates.
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http://dx.doi.org/10.1021/acsami.2c11172 | DOI Listing |
RSC Adv
December 2024
Department of Chemical Engineering, School of Mechanical, Chemical and Materials Engineering, Adama Science and Technology University P. O. Box 1888 Adama Ethiopia
Hierarchical binder-free NiCoO@CuS composite electrodes have been successfully fabricated on a nickel foam surface using a facile hydrothermal method and directly used as a battery-type electrode material for supercapacitor applications. The surface morphological studies reveal that the composite electrode exhibited porous NiCoO nanograss-like structures with CuS nanostructures. The surface area of the composite is significantly enhanced (91.
View Article and Find Full Text PDFAdv Mater
December 2024
Tianjin Key Lab for Rare Earth Materials and Applications, Center for Rare Earth and Inorganic Functional Materials, School of Materials Science and Engineering, National Institute for Advanced Materials, Nankai University, Tianjin, 300350, China.
Currently, there are still obstacles to rationally designing the ligand fields to activate rare-earth (RE) elements with satisfactory intrinsic electrocatalytic reactivity. Herein, axial coordination strategies and nanostructure design are applied for the construction of La single atoms (La-Cl SAs/NHPC) with satisfactory oxygen reduction reaction (ORR) activity. The nontrivial LaNCl motifs configuration and the hierarchical porous carbon substrate that facilitates maximized metal atom utilization ensure high half-wave potential (0.
View Article and Find Full Text PDFSmall
December 2024
State Key Laboratory of Chemical Resource Engineering, Beijing Engineering Center for Hierarchical Catalysts, College of Chemistry, Beijing University of Chemical Technology, Beijing, 100029, P. R. China.
Organic anode materials have been recognized as promising candidates for low-cost and sustainable lithium-ion batteries (LIBs), which however suffer from the inferior cycling stability and low conductivity with unsatisfactory LIBs performance. Herein, two conjugated phthalocyanine-based covalent organic frameworks (COFs), namely CoPc-Ph-COF and CoPc-3Ph-COF, are synthesized by the nucleophilic substitution reaction of hexafluorophthalocyanine cobalt (II) (CoPcF) with 1,2,4,5-tetrahydroxybenzene and 9,10-dimethyl-2,3,6,7-tetrahydroxyanthracene, respectively. Powder X-ray diffraction and electron microscopy analysis reveal the crystalline porous structure of both COFs with a pore size of 1.
View Article and Find Full Text PDFSmall
December 2024
Université de Lorraine, CNRS, IJL, Epinal, F-88000, France.
The rational design of metal-nitrogen-doped carbons (M-N-C) from available and cost-effective sources featuring high electrocatalytic performance and stability is attractive for the development of viable low-temperature fuel cells. Herein, mimosa tannin, an abundant polyphenol easily extracted from the Mimosa plant, is used as a natural carbon source to produce a tannin-Fe(III) coordination complex. This process is assisted by Pluronic F127, which acts as both a surfactant and a promoter of Fe-N active sites.
View Article and Find Full Text PDFInt J Biol Macromol
December 2024
State Key Laboratory of Biobased Transport Fuel Technology, Zhengzhou University, 100 Kexue Dadao, Zhengzhou 450001, China; School of Chemical Engineering and Technology, Zhengzhou University, Zhengzhou 450001, China. Electronic address:
Herein, UiO-66 was selected as the immobilization carrier of Rhizomucor miehei lipase (RML). After etching and hydrophobic modification, the functionalized UIO-66 (H-UIO-66-OPA) was utilized for RML immobilization and the obtained RML@H-UIO-66-OPA showed about 70 % relative activity after incubation at 60 °C, which was much better than RML (20 %). RML@H-UIO-66-OPA was used in the synthesis of 1,3-dioleic acid glycerol (1,3-DAG) and the effects of reaction conditions (temperature, enzyme addition, substrate molar ratio, and time) on 1,3-DAG yield were investigated.
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