Controllable synthesis of CaTi 2 O 4 (OH) 2 nanoflakes by a facile template-free process and its properties

Abstract

Abstract Serrated leaf-like CaTi 2 O 4 (OH) 2 nanoflake crystals were synthesized via a template-free and surfactant-free hydrothermal process. The samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM). The growth process for CaTi 2 O 4 (OH) 2 nanoflakes was dominated by a crystallization–dissolution–recrystallization growth mechanism. BET analysis showed that CaTi 2 O 4 (OH) 2 nanoflakes had mesoporous structure with an average pore size of 8.7 nm, and a large surface area of 88.4 m 2 g −1 . Cyclic voltammetry and galvanostatic charge–discharge tests revealed that the electrode synthesized from CaTi 2 O 4 (OH) 2 nanoflakes reached specific capacitances of 162 F g −1 at the discharge current of 2 mA cm −2 , and also exhibited excellent electrochemical stability.