Enhanced Hot/Free Electron Effect for Photocatalytic Hydrogen Evolution Based on 3D/2D Graphene/MXene Composite

. Furthermore, consistent with the proposed hot/free electron emitting mechanism, the photocurrent rises with increasing the photon energy from visible to ultraviolet light and the light intensity under the same frequency range. These results indicate that using the hot electron generated from graphene and enhanced by other 2D materials might be an effective strategy for enhancing the activity of the photocatalytic materials for water splitting.