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The sodium layered oxides Na2Ni2TeO6, Na2Co2TeO6 and Na1.6Sr0.2Ni2TeO6 have been synthesized by conventional solid-state method. The samples were characterized by X-ray diffractometry (XRD), cyclic voltammetry (CV), scanning electron microscopy (SEM) and charge–discharge measurements. The results show that all the samples crystallize in a hexagonal unit cell without impurity. The electrochemical Na...
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