Uniform PtRu0.6 Nanoparticles Supported on Nitrogen-Doped Carbon Obtained from ZIF-8/GO Hybrid with Remarkable Alkaline Hydrogen Oxidation Activity

Recent advances in platinum-group-metal based electrocatalysts for alkaline hydrogen oxidation reaction

“…By using it as the anode, the AEMFC single cell showed a very high peak power density (PPD) value of 1.3 W cm -2 . Similarly, Rh 2 P NPs reported by Yang et al also exhibited significantly improved activity compared to pure Rh NPs [60] . Huang et al adopted a defect-derived strategy for creating phosphorous vacancies (P-vacancies) on Rh 2 P to break the atomically homogeneous surfaces that are terminated by P atoms [209] .…”

“…According to the elementary steps of alkaline HOR electrocatalysis, OH − exists in both the Heyrovsky and Volmer steps, which means that the adsorption ability of catalysts for OH species may be another significant factor in effecting the catalytic kinetics. Although the form of OH species participating in the elementary steps is still controversial, there are many explorations that have confirmed that the OHBE of catalysts is closely related to the alkaline HOR electrocatalytic activity [55][56][57][58][59][60][61] . Thus, a bi-functional mechanism containing both the HBE and OHBE theories has been widely proposed to explain the alkaline HOR kinetics.…”

“…However, the studies about the metal phosphides for alkaline HOR have been less reported until recently. A series of PGM (Ru, Rh, or Pd)-based phosphides towards hydrogen electrooxidation in alkaline media have been developed [60,207,208] . Typically, Typically, Zhao et al reported that Ru 2 P exhibited about three times enhanced intrinsic activity compared to element Ru and was comparative to commercial Pt/C [207] .…”

“…As reviewed above, the electrocatalytic activities of PGM-based catalysts are closely related to the atomic arrangement, size, dispersion, dimension, component, active layer, and interface. [Table 1] summarizes the specific activities and mass activities of various types of PGM-based electrocatalysts in alkaline HOR electrocatalysis in recent years [25,60,75,109,117,137,153,164,177,178,185,186,209,217,222,224,226, . Their electrocatalytic performance can be improved by several strategies, including the design of metastable or amorphous nanoscale catalysts to expose abundant active sites, introducing foreign metal atoms to form multicomponent catalysts towards optimizing the surface electronic structures, constructing effective internal and/or external interfaces with strong interfacial interactions, etc.…”