Details

Autor(en) / Beteiligte

• Hua, Erbing
• Choi, Seunggun
• Ren, Siyuan
• Kim, Sungjun
• Ali, Ghulam
• Kim, Seon Je
• Jang, Woo-Sung
• Joo, Soyun
• Zhang, Jingshu
• Ji, Seulgi
• Cho, Yun Seong
• Kang, Joohoon
• Song, Taeseup
• Hong, Seungbum
• Choi, Heechae
• Kim, Young-Min
• Han, Hyuksu
• Kim, Sung Wng

Titel

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

Ist Teil von

• Energy & environmental science, 2023-10, Vol.16 (1), p.4464-4473

Ort / Verlag

Cambridge: Royal Society of Chemistry

Erscheinungsjahr

2023

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 ([Ti 2 O] 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 [Ti 2 O] 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. Negatively charged Pt nanoparticles supported by a [Ti 2 O] 2+ ·2e − electride with a self-passivation a-TiO x layer demonstrated superb long-term durability in the electrocatalytic ORR, which is superior to that of commercial Pt/C catalysts.