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Amorphous hierarchical NiCo ₂ O ₄ –CoNiO ₂ hybrids have been successfully fabricated via a facile one-pot hydrothermal route, followed by morphologic conversion into urchin-like structured NiCo ₂ O ₄ –CoNiO ₂ nanorods and irregular-shaped hierarchical NiCo ₂ O ₄ –CoNiO ₂ polyhedral nanocrystals through air-annealing treatment at 450 °C and 650 °C, respectively.
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Wu et al. (2015) studied this question.
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