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A self-template method is developed for hierarchically yolk-shelled NiCo2O4 spheres (YS-NiCo2O4) through a controlled hydrolysis process and followed by a thermal annealing treatment. The yolk-shelled NiCo2O4 spheres possess out-shell consisting of hundreds of ultrathin sheets with 3–5nm in thickness and solid yolk composing of a large number of nanoparticles. The YS-NiCo2O4 generates a large specific...
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