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Conversion of confined metal@ZIF-8 structures to intermetallic nanoparticles supported on nitrogen-doped carbon for electrocatalysis

TitleConversion of confined metal@ZIF-8 structures to intermetallic nanoparticles supported on nitrogen-doped carbon for electrocatalysis
Publication TypeJournal Article
Year of Publication2018
AuthorsQi, ZY, Pei, YC, Goh, TW, Wang, ZY, Li, XL, Lowe, M, Maligal-Ganesh, RV, Huang, WK
JournalNano Research
Volume11
Pagination3469-3479
Date Published06
Type of ArticleArticle
ISBN Number1998-0124
Accession NumberWOS:000433048600047
Keywordscage confinement, catalysis, chemistry, chemoselective hydrogenation, control, efficient, electrocatalysis, fuel-cells, gold nanoparticles, Intermetallic compounds, Materials Science, metal-organic frameworks, oxygen reduction reaction, pd nanoparticles, physics, porous carbon, Pyrolysis, sintering resistance, size, Technology - Other Topics
Abstract

We report a facile strategy to synthesize intermetallic nanoparticle (iNP) electrocatalysts via one-pot pyrolysis of a zeolitic imidazolate framework, ZIF-8, encapsulating precious metal nanoparticles (NPs). ZIF-8 serves not only as precursor for N-doped carbon (NC), but also as Zn source for the formation of intermetallic or alloy NPs with the encapsulated metals. The resulting sub-4 nm PtZn iNPs embedded in NC exhibit high sintering resistance up to 1,000 A degrees C. Importantly, the present methodology allows fine-tuning of both composition (e.g., PdZn and RhZn iNPs, as well as AuZn and RuZn alloy NPs) and size (2.4, 3.7, and 5.4 nm PtZn) of the as-formed bimetallic NPs. To the best of our knowledge, this is the first report of a metal-organic framework (MOF) with multiple functionalities, such as secondary metal source, carbon precursor, and size-regulating reagent, which promote the formation of iNPs. This work opens a new avenue for the synthesis of highly uniform and stable iNPs.

DOI10.1007/s12274-018-2016-x
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Short TitleNano Res.