Preparation and Characterization of Ni-Al and Co-Al Layered Double Hydroxide by Reduction-Oxidation Method
DOI:
https://doi.org/10.33736/jaspe.13337.2026Keywords:
Cobalt-aluminium based layered double hydroxide,, nickel-aluminium based layered double hydroxide, layered compound, band gap,, morphologyAbstract
Layered double hydroxides have been extensively used as electrode materials, adsorbents and precursors for catalysts. In this work, a simple preparative method was adopted, and its influence on the crystallinity and band gap values was investigated. Cobalt-aluminium and nickel-aluminium based layered double hydroxides (0.75:0.25/0.667:0.333) were prepared using the reduction-oxidation method. Ni2+/Co2+ cations were reduced to metallic cobalt/nickel using sodium borohydride in the presence of trivalent aluminium ions and sodium carbonate solution at 28- 30 °C to prepare layered double hydroxides (LDHs). The resulting compounds were characterized using powder X-ray diffraction, infrared spectra, scanning electron microscopy and UV-visible diffuse reflectance spectra. The interplanar spacings around 7.6 Å for Co-Al LDHs (0.75/667:0.333) and Ni-Al LDHs (0.75:0.25/0.667:0.333) were observed from the powder X-ray diffraction patterns. Infrared spectral data confirm the presence of water molecules and carbonate ions in the interplanar region. Co-Al (0.75:0.25/0.667:0.333) LDH and Ni-Al (0.75:0.25/0.667:0.333) LDHs exhibit band gaps in the range of 2 to 5.4 eV, indicating that the compounds exhibit semiconducting to insulating behaviour. Scanning electron microscopic data shows irregular morphologies with particle sizes in the micrometer range for both Co-Al (0.75:0.25/0.667:0.333) LDH and Ni-Al (0.75:0.25/0.667:0.333) LDH samples, respectively.
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