Synergistic Regulation of Pt Clusters on Porous Support by Mo and P for Robust Bifunctional Hydrogen Electrocatalysis

Abstract

Developing efficient electrocatalysts toward hydrogen oxidation and evolution reactions (HER/HOR) in alkaline electrolytes is essential for realizing renewable hydrogen technologies. Herein, we demonstrate that the introduction of dualactive species such as Mo and P (Pt/Mo,P@NC) can effectively regulate the surface electronic structure of platinum (Pt) and significantly improve the HOR/HER performance. The optimized Pt/Mo,P@NC exhibits remarkable catalytic activity, achieving a normalized exchange current density of 2.89 mA cm −2 and a mass activity of 2.3 mA μg Pt −1 , which are approximately 2.2 and 13.5 times higher than those of the state-of-the-art Pt/C catalyst, respectively. Moreover, it performs an impressive HER performance with an overpotential of 23.4 mV at 10 mA cm −2 , which is lower than most documented alkaline electrocatalysts. Experimental results reveal that the modifying effect of Mo and P optimizes the adsorption of H and OH on Pt/Mo,P@NC, resulting in an outstanding catalytic performance. This work has significant theoretical and practical significance for developing a novel and highly efficient catalyst for bifunctional hydrogen electrocatalysis.

Electronic metal–support interaction via Ni defect-induced Ru-modified Ni–CeO2 for enhanced hydrogen oxidation activity

“…S5†) displayed deconvolution peaks at 284.0, 284.8, 286.0, 288.2, and 290.1 eV, corresponding to CC, C–C, C–O, CO, and O–CO, respectively, serving as calibration benchmarks. 19,22 Meanwhile, deconvolution peaks near 281.0 and 285.1 eV represented 3d 5/2 and 3d 3/2 of metal Ru, respectively, 23 and the peaks at about 282.4 and 286.6 eV were 3d 5/2 and 3d 3/2 of RuO 2 , respectively, owing to unavoidable oxidation by exposure to air. 24 Additionally, the high-resolution XPS spectra of Ru 3p further revealed the valence state of Ru.…”