Converting solar energy into hydrogen (H₂) by photocatalytic water splitting is a promising approach to simultaneously address the increasing energy demand and environmental issues. Half decade has passed since the discovery of photo-induced water splitting phenomenon on TiO₂ photoanode, while the solar to H₂ efficiency is still around 1%, far below the least industrial requirement. Therefore, developing efficient photocatalyst with a high energy conversion efficiency is still one of the main tasks to be overcome. Graphitic carbon nitride (g-C₃N₄) is just such an emerging and potential semiconductor. Therefore, in this review, the state-of-the-art advances in g-C₃N₄ based photocatalysts for overall water splitting were summarized in three sections according to the strategies used, and future challenges and new directions were discussed.

通过光催化水分解将太阳能转化为氢（H ₂）是一种有前途的方法，可以同时解决不断增长的能源需求和环境问题。自从在TiO ₂光电阳极上发现光致水分解现象以来已经过去了五十年，而太阳能到H _2的效率仍约为1％，远低于最低工业要求。因此，开发具有高能量转化效率的高效光催化剂仍然是要克服的主要任务之一。石墨碳氮化物（gC ₃ N ₄）就是这样一种新兴的潜在半导体。因此，在本综述中，gC ₃ N _4的最新发展 根据所采用的策略，将用于整体水分解的有机光催化剂分为三部分，并讨论了未来的挑战和新的方向。