Dopant Evolution in Electrocatalysts after Hydrogen Oxidation Reaction in an Alkaline Environment.

ABSTRACT: Introduction of interstitial dopants has opened a new pathway to optimize nanoparticle catalytic activity for, e.g., hydrogen evolution/oxidation and other reactions. Here, we discuss the stability of a property-enhancing dopant, B, introduced through the controlled synthesis of an electrocatalyst Pd aerogel. We observe significant removal of B after the hydrogen oxidation reaction. Ab initio calculations show that the high stability of subsurface B in Pd is substantially reduced when H is adsorbed/absorbed on the surface, favoring its departure from the host nanostructure. The destabilization of subsurface B is more pronounced, as more H occupies surface sites and empty interstitial sites. We hence demonstrate that the H₂ fuel itself favors the microstructural degradatio

SUBMITTER: Yoo SH 

PROVIDER: S-EPMC10425978 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature