Photoelectrochemical (PEC) water splitting could potentially solve the global energy crisis and environmental pollution. In the present work, ternary composites consisting of 2D nanomaterials of SnS2, reduced graphene oxide (RGO), and mesoporous graphitic carbon nitride (mpg-C3N4) are synthesized with layered architecture. The photocurrent density of the ternary composite is 1.45 mA/cm(2) at 1.23 V vs RHE, which is over 23 times higher than that of pure SnS2. The superior photocatalytic activity of mpg-C3N4/SnS2/RGO composite is attributed to synchronous effects of all the materials leading to enhanced electron-hole pair separation, as well as increased visible-light absorption. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.