Synthesis of nickel hydroxychloride microspheres via a facile template-free process and their conversion to β-Ni(OH)2 microspheres

Hierarchical flower-like nickel hydroxychloride microspheres were prepared by forced hydrolysis reaction of nickel chloride hexahydrate in ethanol via a facile template-free solvothermal process. The flower-like nickel hydroxychloride microspheres, which were prepared with low concentration of Ni without adding H2O, were composed of crumpled nanosheets with random orientation. The aggregation growth and the dissolution-recrystallization process were involved in the formation of the flower-like nickel hydroxychloride microspheres. The flower-like beta-Ni(OH)(2) microspheres were prepared by nickel hydroxychloride microspheres treated with high concentration of KOH. The beta-Ni(OH)(2) microspheres prepared with higher concentration of KOH showed better electrochemical performance, while the beta-Ni(OH)(2) microspheres prepared with lower concentration of KOH showed better adsorption activity for acid fuchsine.