A kind of hierarchical porous carbon (HCN) with three-dimensional network frameworks was successfully prepared by solvent-free nanocasting method using glucose as carbon source and ordered MCM-41 type of mesoporous silica with the different particle sizes as template. Meanwhile, its structure features and texture parameters were characterized by using XRD, N2 adsorption-desorption isotherms, SEM and TEM, FT-IR, Raman spectrum, XPS techniques. These results demonstrated that during the process of pyrolysis glucose was strongly interacted with mesoporous silica, leading to effective loading, then inverse duplicated the structure of mesoporous silica. The obtained sequence of hierarchical porous carbons possessed well-interconnected network structure and tunable wall thickness and size of network macropore. As demonstrations, the capacity of absorbed CO2 for serials of hierarchical porous carbons with three-dimensional network frameworks under room temperature was investigated. The result of CO2 adsorption isotherms indicated that the HCN pore architecture and morphologies played a key role in the CO2 capture process, specifically the size of network macropore and thickness of macroporous wall significantly affected the textural structure, the high microporous contents were benefit with improving the capacity of absorbed CO2.
With a unique cellular structure to enhance the multi-reflection and multi-absorption properties of electromagnetic waves, metal foam is considered a new type of electromagnetic shielding material that can also be used for lightweight structural applications such as energy absorption and shock attenuation. This work introduces reduced graphene oxide (RGO) to reinforce Cu foam for the purpose of improvement of the foam's mechanical and electromagnetic shielding properties. After the preparation stage of the electrodeposition and heat treatments, the RGO was observed to uniformly disperse in the Cu foam matrix and nano-sized Cu2O particles formed at the interface. This resulted in improved mechanical properties and electromagnetic shielding performance compared to the pure Cu foams. The primary shielding mechanism was deduced as absorption loss.
An efficient, rapid, and fast kinetics of the metal-organic framework MOF235 was successfully prepared by microwave-assisted thermolysis strategy. Fourier transform infrared spectra (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), N 2 adsorption-desorption isotherm, and scanning electron microscopy (SEM) were used to characterize the samples. Experimental results revealed the suitability of MOF235 for use as an adsorbent for acid chrome blue K. The maximum adsorption capacity of acid chrome blue K onto MOF235 can reach to 591.79 mg g -1 at 293 K. The sorption behavior fitted to the pseudo-second-order kinetic model and the Langmuir isotherm. Adsorption of acid chrome blue K is a spontaneous and endothermic process. Therefore, the as-prepared MOF235 displays a great potential for environmental purification.
Abstract The development of high-performance and cost-effective electrocatalysts toward the oxygen evolution reaction (OER) is remarkably desirable but challenging. Herein, we design and fabricate a sea urchin-like S-doped Ni(OH)2 electrocatalyst on nickel foam using a simple hydrothermal method, followed by treatment with Na2S solution. The introduction of S not only modulates the electronic structure of Ni(OH)2, but also improve the electronic conductivity, thus enhancing the OER performance of Ni(OH)2. Owing to the free-standing feature, modified electronic structure and sea urchin-like structure, the optimized S-Ni(OH)2-30 min delivered excellent OER performance with overpotentials of 306 and 392 mV at 10 and 100 mA cm− 2, respectively, Tafel slope of 89.2 mV dec− 1 and stability for 12 h at 20 mA cm− 2. This work demonstrates the importance of incorporating S in Ni(OH)2 to optimize the electronic structure for improving OER activity and provides a promising pathway to synthesize Ni(OH)2-based electrocatalysts.
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