Construction of Hierarchical PdAgAu Nanorings/MXene–GO Electrocatalysts for Efficient and Ultrastable Hydrogen Evolution Reaction
Chaohai Sun, Yong Zen Tan, Yi Huang, Fang Guo, Linghan Deng, Si Cheng
Abstract
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 are synthesized and further self‐assembled on Ti 2 CT x –graphene oxide (GO) heterostructure for efficiently boosting HER. The best candidate, Pd 50 Ag 31 Au 19 /Ti 2 CT x –GO electrocatalyst, can initiate hydrogen evolution at an overpotential of 90 mV at 10 mA cm −2 and exhibits the lowest Tafel slope of 75 mV dec −1 as well as the highest mass activity of 284.4 mA mg −1 Pd at −100 mV, in comparison with those of Pd 50 Ag 31 Au 19 /Ti 2 CT x , Pd 50 Ag 31 Au 19 /GO, and commercial Pd/C. Most remarkably, impressive long‐term stability is achieved even after a 112 h chronoamperometric test. The great performance of Pd 50 Ag 31 Au 19 /Ti 2 CT x –GO electrocatalyst can be attributed to the advantageous synergistic effect among the morphological modulation, composition optimization, and strong metal–support interaction effect between the Pd 50 Ag 31 Au 19 nanorings and Ti 2 CT x –GO support.