This study is focused on the preparation of metal (Cu, Zn) nanopowders by an electrochemical reduction/precipitation procedure, which provides the primary components for the development of CuZn alloy metallic foams. This well-controlledmethod allows straight forward control of the reaction parameters and the restriction of oxidation effects, while resulting in stable and small grain size metal nanopowders. Whether precipitation of Cu and Zn is held separately or in alternating deposition mode, the characteristics of synthesized nanopowders assist easier mixing, alloying and realization of metallic foams suitable for water treatment applications. CuZn alloy foams developed with this technique presented equivalent efficiency and lower corrosion and leaching rates compared to those prepared with commercial powder methods.
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http://dx.doi.org/10.1166/jnn.2019.16657 | DOI Listing |
Adv Mater
January 2025
Hefei National Research Center for Physical Sciences at the Microscale, Department of Materials Science and Engineering, CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China, Hefei, 230026, China.
Electrocatalytic biomass conversion offers a sustainable route for producing organic chemicals, with electrode design being critical to determining reaction rate and selectivity. Herein, a prediction-synthesis-validation approach is developed to obtain electrodes for precise biomass conversion, where the coexistence of multiple metal valence states leads to excellent electrocatalytic performance due to the activated redox cycle. This promising integrated foam electrode is developed via acid-induced surface reconstruction to in situ generate highly active metal (oxy)hydroxide or oxide (MOH or MO) species on inert foam electrodes, facilitating the electrooxidation of 5-hydroxymethylfurfural (5-HMF) to 2,5-furandicarboxylic acid (FDCA).
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January 2025
School of Civil Engineering, Central South University, Changsha, 410083, China.
This study investigates the deposition of tantalum (Ta) coatings on carbon foams using the chemical vapor deposition (CVD) method to enhance their compressive strength. Two types of open-cell carbon foams, CF-1 and CF-2, with different strut diameters, were examined. The morphology and uniformity of the coatings were characterized, and the effect of coating thickness on the compressive strength of the foams was systematically analyzed.
View Article and Find Full Text PDFSmall Methods
January 2025
Research Institute of Frontier Science, Southwest Jiaotong University, Chengdu, 610031, P. R. China.
Commercial 3D zinc foam anodes with high deposition space and ion permeation have shown great potential in aqueous ion batteries. However, the local accumulated stress from its high-curvature surface exacerbates the Zn dendrite issue, leading to poor reversibility. Herein, we have employed zincophilic N-doped carbon@Sn composites (N-C@Sn) as nano-fillings to effectively release the local stress of high curvature surface of 3D Zn foams toward dendrite-free anode in aqueous zinc ion battery (AZIB).
View Article and Find Full Text PDFPolymers (Basel)
December 2024
School of Energy and Building Environment, Guilin University of Aerospace Technology, Guilin 541004, China.
In this paper, we investigated the efficient metal-free phosphorus-nitrogen (PN) catalyst and used the PN catalyst to degrade waste PU with two-component binary mixed alcohols as the alcohol solvent. We examined the effects of reaction temperature, time, and other factors on the hydroxyl value and viscosity of the degradation products; focused on the changing rules of the hydroxyl value, viscosity, and molecular weight of polyols recovered from degradation products with different dosages of the metal-free PN catalyst; and determined the optimal experimental conditions of reaction temperature 180 °C, reaction time 3 h, and PN dosage 0.08%.
View Article and Find Full Text PDFACS Appl Mater Interfaces
January 2025
Key Laboratory of Advanced Metallic Materials of Jiangsu Province, School of Materials Science and Engineering, Southeast University, Nanjing 211189, P. R. China.
Gradient structures are effective for microwave absorbing but suffer from inadequate lightweight and poor flexibility, making them fall behind the comprehensive requirements of electromagnetic protection. Herein, we propose a hierarchical gradient structure by integration with porous and sandwich structures. Specifically, polyimide (PI) foams are used as a robust and flexible skeleton, in which the foam cell walls are sandwiched by TiCT, ZnO, and ZrO atomic layers in sequence.
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