MXene-based materials are promising electrode materials for electrochemical capacitors (ECs) due to their unique two-dimensional layered structure, high surface area, remarkable chemical stability, and electrical conductivity. TiO2 nanoparticles decorated Ti3C2 MXene were synthesized through a simple in situ hydrolysis and heat-treatment process and subsequently fabricated as an electrode for ECs. The as-prepared Ti3C2, TiO2, and TiO2-Ti3C2 were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The results indicated that TiO2 nanoparticles with a diameter of less than 30 nm were decorated onto the Ti3C2 MXene nanosheets. The resulting composites exhibited significantly higher specific capacitance of 143 F g(-1) at 5 mV s(-1), which was 1.5 times that of pure Ti3C2 (93 F g(-1)). Moreover, TiO2-Ti3C2 showed excellent cycling stability, retaining 92% of its initial capacitance after 6000 cycles. These results suggest that TiO2-Ti3C2 nanocomposite has the potential as an electrode material for high-performance energy storage devices. (C) 2016 The Electrochemical Society. All rights reserved.