Fabrication of CoNi alloy hollow-nanostructured microspheres for hydrogen storage application
Source abstract
Abstract
Co20Ni80 hollow-nanostructured microspheres are prepared by template-free hydrothermal method at low temperature (150 °C). The prepared CoNi nanostructures have face-centered cubic crystal lattice. Williamson–Hall analysis shows crystallite size of 55.5 nm and microstrain of 0.00265. Elemental mapping confirms the uniform distribution of Co and Ni atoms in sample. The size of hollow spheres is in the range of 1–3 μm which increase to 10 μm by increasing the reaction time. A stepwise growth mechanism based on time-dependent experiment is briefly described. The X-ray photoelectron spectroscopy analysis suggests the only metallic chemical state of Co and Ni in sample (no surface oxidation). The specific surface area of 80.56 m2/g is obtained for 2 μm hollow sphere. The Co20Ni80 hollow-nanostructured microsphere shows 0.92 mass% hydrogen absorption and 81 % release of stored hydrogen. Hydrogen storage is attributed to crystal defects. The effects of morphology and surface area on hydrogen storage capacity and response are described. The saturation magnetization of 72.1 emu/g and coercivity of 157.21 Oe are observed for 2 μm hollow spheres. However, saturation magnetization of 77.5 emu/g and coercivity of 120 Oe are observed for 10 μm hollow spheres. The enhanced coercivity is related to surface and shape anisotropy due to hollow structure.
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Research context
OpenAlex topics: Hydrogen Storage and Materials · Electrocatalysts for Energy Conversion · Catalysis and Hydrodesulfurization Studies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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