▎ 摘　　要

To improve electrocatalytic performance, 2D/2D MXene/ reduced graphene oxide (RGO) heterostructures was prepared by constructing of Ti-O-C connection between two layers. A Ti-O-C connection not only facilitates charge transfer from MXene to RGO but also creates active sites for active species generation. Through in-depth mechanism investigation, all 1O2, O2 & BULL;-and active chlorine were identified as active species for APAP degradation by triggering raw MXene, RGO, and MXene/RGO. Explosive generation of O2 & BULL;-and active chlorine was responsible for the excellent catalytic activity of MXene/RGO. Experimental and density functional theory calculation results demonstrated the critical contributions of charge transfer and Ti-OH edges for active chlorine generation. At Ti-OH edges, Cl- can seize electron from H in H2O (absorbed on MXene/RGO surface), and the Ti -OH edges withdraw electrons from O in H2O. Then, electrons captured by the Ti-OH edges were transferred from MXene to RGO, resulting in the electrostatic imbalance in the Ti-OH/H2O/Cl- region, electron deficiency in H2O, and ultimately active chlorine generation. The electron-rich properties of RGO simultaneously enhanced the production of O2 & BULL;-radicals. This study provided deepen mechanism discussion for electrocatalytic performance improvement over stable 2D/2D MXene/RGO heterostructures.