Al-Bi(C2H5OH)3-C Oxidation-resistant Bulk Materials for Hydrogen Generation
WU Jinfan1, XU Fen1,*, SUN Lixian1,*, LIAO Lumin2, GUAN Yanxun2
1 School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, Guangxi, China 2 School of Electronic Engineering and Automation, Guilin University of Electronic Technology, Guilin 541004, Guangxi, China
Abstract: For improving the hydrogen production performance of Al-based composites, Al-Bi(C2H5OH)3-C bulk hydrogen generation materials were prepared by high-energy ball milling and spark plasma sintering (SPS), using bismuth acetate (Bi(C2H5OH)3) and different carbon mate-rials as additives. The samples were characterized by X-ray photoelectron spectroscopy (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. Moreover, the efficiency of hydrogen generation and oxidation resistance of the Al-based bulk materials as well as the action mechanism of additives for increasing hydrolytic activity of Al were investigated. The results demonstrate that Al-5% Bi(C2H5OH)3-3% CNTs (if not specified, are mass fraction) bulk material has high reactivity, and its hydrogen yield reaches 1 275.4 mL·g-1 at 333.15 K, which is 31.7% higher than the powder material. And the hydrogen yield of the bulk material still holds 921.5 mL·g-1 after exposed to the air for 35 days, while the powder material basically do not produce hydrogen. It proves that the SPS treatment significantly enhances the oxidation resistance of aluminum-based materials. The XRD and SEM analysis displays that the treatment of SPS causes cracks on the surface of Al particles, as well as the gas by the decomposition of Bi(C2H5OH)3 leads to the formation of a porous structure inside the Al-based bulk. They facilitate contact between Al and water. Meanwhile, the synergistic effect of CNTs (Carbon nanotubes) with more defects and in-situ formed Bi2O3 and Bi is another factor that improves the hydrogen production performance of the bulk materials.
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2025, Vol. 39 
