Negatively charged platinum nanoparticles on dititanium oxide electride for ultra-durable electrocatalytic oxygen reduction

Erbing Hua, Seunggun Choi, Heechae Choi, HyukSu Han*, Sung Wng Kim*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Modulating metal–support interactions (MSIs) has been a rational approach to enhance the kinetics of supported Pt-based nanocatalysts for the oxygen reduction reaction (ORR). However, the sluggish activity and poor durability of the reduced Pt loadings on supporting materials remain challenging issues for a practical ORR. Here, we report negatively charged platinum nanoparticles (Pt NPs) supported by dititanium oxide electride ([Ti2O]2+·2e−) for an ultra-durable electrocatalytic ORR, simultaneously exhibiting 89 and 31 times higher specific and mass activities to those of commercial Pt/C catalysts. MSI-induced spontaneous charge transfer from the [Ti2O]2+·2e− electride to Pt NPs forms negatively charged Pt NPs with surface-accumulated excess electrons. Both atomic-scale microscopic and spectroscopic measurements verify that the omniscient excess electrons on the catalyst completely suppress the formation of Pt–O skins in an alkaline medium. As a result, the catalyst demonstrates a sustainable performance with nearly 95% retention of the initial current density during continuous 350 hours of operation.
Original languageEnglish
JournalEnergy and Environmental Science
DOIs
Publication statusPublished - 10 Aug 2023

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