Using structural phase transitions to enhance electrochemical properties without has received wide attention due to its large active area and excellent electron transport capacity. In this work, hollow C@SnS2/SnS nanocomposites were successfully synthesized from hollow C@SnS2 by controlling the temperature and time of the phase transitions. It is found that this hollow C@SnS2/SnS nanocomposite can serve as electrocatalyst, showing excellent oxygen evolution reaction performance. The Sn (IV) heterostructure easily accepts electrons in water and plays a crucial role in the oxygen evolution reaction. Meanwhile, the low-valence Sn (II) can maintain a stable structure in the electrochemical reaction and thus exhibits good electrochemical performance with an overpotential of 380 mV, at the current density of 10 mA cm(-2), and a low Tafel slope of 63 mV dec(-1), which is far lower than that of pure SnS or SnS2. (C) 2020 Published by Elsevier Inc.