Negatively charged platinum nanoparticles on dititanium oxide electride for ultra-durable electrocatalytic oxygen reduction
- Authors
- Hua, Erbing; Choi, Seunggun; Ren, Siyuan; Kim, Sungjun; Ali, Ghulam; Kim, Seon Je; Jang, Woo-Sung; Song, Taeseup; Han, Hyuksu; Kim, Sung Wng; Joo, Soyun; Zhang, Jingshu; Ji, Seulgi; Cho, Yun Seong; Kang, Joohoon; Hong, Seungbum; Choi, Heechae; Kim, Young-Min
- Issue Date
- Oct-2023
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- ENERGY & ENVIRONMENTAL SCIENCE, v.16, no.10, pp.4464 - 4473
- Indexed
- SCIE
SCOPUS
- Journal Title
- ENERGY & ENVIRONMENTAL SCIENCE
- Volume
- 16
- Number
- 10
- Start Page
- 4464
- End Page
- 4473
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/192926
- DOI
- 10.1039/d3ee01211e
- ISSN
- 1754-5692
- 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+)& BULL;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+)& BULL;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.
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