Robust MOF-253-derived N-doped carbon confinement of Pt single nanocrystal electrocatalysts for oxygen evolution reaction

Publication date: May 2020Source: Chinese Journal of Catalysis, Volume 41, Issue 5Author(s): Hellen Gabriela Rivera Monestel, Ibrahim Saana Amiinu, Andrés Alvarado González, Zonghua Pu, BibiMaryam Mousavi, Shichun MuAbstractAlthough carbon-supported platinum (Pt/C) is still considered the most active electrocatalyst for hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR), its applications in metal-air batteries as a cathode catalyst, or for oxygen generation via water splitting electrolysis as an anode catalyst is mainly constrained by the insufficient kinetic activity and stability in the oxygen evolution reaction (OER). Here, MOF-253-derived nitrogen-doped carbon (N/C)-confined Pt single nanocrystals (Pt@N/C) have been synthesized and shown to be efficient catalysts for the OER. Even with low Pt mass loading of 6.1 wt% (Pt@N/C-10), the catalyst exhibits greatly improved activity and long-time stability as an efficient OER catalyst. Such high catalytic performance is attributed to the core-shell structure relationship, in which the active N-doped-C shell not only provides a protective shield to avoid rapid Pt nanocrystal oxidation at high potentials and inhibits the Pt migration and agglomeration, but also improves the conductivity and charge transfer kinetics.Graphical AbstractBy using MOF-253 as a carbon template, a well-dispersed and highly stabilized Pt single nanocrystal confined in a N-doped carbon framework is synthesized, and is shown to exhibit a...
Source: Chinese Journal of Catalysis - Category: Chemistry Source Type: research