Construction of Hierarchical PdAgAu Nanorings/MXene–GO Electrocatalysts for Efficient and Ultrastable Hydrogen Evolution Reaction

High overpotential and poor long-term operation stability of electrocatalysts are two major barriers for the hydrogen evolution reaction (HER). Herein, 2D ultrathin PdAgAu nanorings synthesized further self-assembled on Ti2CTx–graphene oxide (GO) heterostructure efficiently boosting HER. The best candidate, Pd50Ag31Au19/Ti2CTx–GO electrocatalyst, can initiate at an 90 mV 10 mA cm−2 exhibits lowest Tafel slope 75 dec−1 as well highest mass activity 284.4 mg−1Pd −100 mV, in comparison with those Pd50Ag31Au19/Ti2CTx, Pd50Ag31Au19/GO, commercial Pd/C. Most remarkably, impressive is achieved even after a 112 h chronoamperometric test. great performance electrocatalyst be attributed to advantageous synergistic effect among morphological modulation, composition optimization, strong metal–support interaction between Pd50Ag31Au19 Ti2CTx–GO support.