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<p>The phases formed by alkaline precipitation of Ni(OH)<sub>2</sub> at different temperatures and different levels of carbonate and nitrate anions have been characterized by X-ray diffraction, elemental analysis, FTIR spectroscopy, TG-MS, N<sub>2</sub> physisorption and cyclic voltammetry. The dehydration-deanionization of α- to β-Ni(OH)<sub>2</sub> passes through an interstratified intermediate IS-Ni(OH)<sub>2</sub>, which can be stabilized at 80&#xa0;°C in the presence of carbonates. IS-Ni(OH)<sub>2</sub> materials have been prepared with CO<sub>3</sub><sup>2−</sup>/Ni<sup>2+</sup> ratio ranging from 0.05 to 0.16, resulting in different ratios of interstratified α and β phase layers. IS-Ni(OH)<sub>2</sub>, thermally stable up to 200&#xa0;°C, presents a peculiar ink-bottle mesoporosity and surface area higher than 100&#xa0;m<sup>2</sup>&#xa0;g<sup>−1</sup>. The material is promising for electrocatalytic applications on the basis of the textural properties and a reproducible reduction potential of 0.37&#xa0;V versus SCE. The easily reversible reducibility of Ni<sup>2+</sup> is also shown by the TG-MS of the thermal dehydroxylation-deanionization to NiO, evidencing transient Ni<sup>3+</sup> species formed by reaction with NO<sub>x</sub> emitted from the decomposition of nitrates.</p> Graphical abstract <p></p>

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Carbonates stabilize interstratified α/β intermediates in the preparation of nickel hydroxide

  • 期刊论文

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  • 发表日期：

    2025年3月11日

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  • P. H. Ho,
  • I. Z. Awan,
  • N. Tanchoux,
  • R. Arletti,
  • S. Albonetti,
  • F. Cavani,
  • A. Martucci,
  • H. Petitjean,
  • D. Tichit,
  • P. Benito,
  • F. Di Renzo

摘要

The phases formed by alkaline precipitation of Ni(OH)2 at different temperatures and different levels of carbonate and nitrate anions have been characterized by X-ray diffraction, elemental analysis, FTIR spectroscopy, TG-MS, N2 physisorption and cyclic voltammetry. The dehydration-deanionization of α- to β-Ni(OH)2 passes through an interstratified intermediate IS-Ni(OH)2, which can be stabilized at 80 °C in the presence of carbonates. IS-Ni(OH)2 materials have been prepared with CO32−/Ni2+ ratio ranging from 0.05 to 0.16, resulting in different ratios of interstratified α and β phase layers. IS-Ni(OH)2, thermally stable up to 200 °C, presents a peculiar ink-bottle mesoporosity and surface area higher than 100 m2 g−1. The material is promising for electrocatalytic applications on the basis of the textural properties and a reproducible reduction potential of 0.37 V versus SCE. The easily reversible reducibility of Ni2+ is also shown by the TG-MS of the thermal dehydroxylation-deanionization to NiO, evidencing transient Ni3+ species formed by reaction with NOx emitted from the decomposition of nitrates.

Graphical abstract