Modulating the electrocatalytic performance of Palladium (Pd) with nonmetallic elements (e.g., H, B, C, N, O, P and S) has gained ever-increasing attention since their introduction been proven to effectively modulate 3d-electronic configuration subsurface properties Pd. In this review, most advanced nonmetal-modified Pd-based catalysts are classified according different doped atoms (i.e., hydri...