Immiscible bi-metal single-atoms driven synthesis of electrocatalysts having superb mass-activity and durability

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Title
Immiscible bi-metal single-atoms driven synthesis of electrocatalysts having superb mass-activity and durability
Author
Harzandi, Ahmad M.Shadman, SaharHa, MiranMyung, Chang WooKim, Dong YeonPark, Hyo JuSultan, SirajNoh, Woo-SukLee, WanggeunThangavel, PandiarajanByun, Woo JinLee, Seong-hunTiwari, Jitendra N.Shin, Tae JooPark, Jae-HoonLee, ZonghoonLee, Jae SungKim, Kwang S.
Issue Date
2020-08
Publisher
ELSEVIER
Citation
APPLIED CATALYSIS B-ENVIRONMENTAL, v.270, pp.118896
Abstract
Properties of metal elements can be modified by alloying. Given that catalytic efficiencies are often maximized using metal single-atoms (SAs), two immiscible metals can improve the catalytic activity when they can be present as non-agglomerated dual SAs. Here, we report yet-unexplored synthesis of high-performance electro-catalysts utilizing immiscibility of Cu/Ru bimetal atoms. In the synthesized electrocatalyst (Cu/Ru@G(N)), both Cu-SAs and Ru-SAs are dispersed on N-doped graphitic-matrix (GN), while other Cu-SAs are bridged to Ru nanoparticles (NPs) surface via nitrogen. It shows superior mass-activity with outstanding catalytic performance and durability for hydrogen evolution reaction (HER), outperforming commercial Pt-20wt%/C. Cu-SAs along with Ru-NPs enhance electric conduction or charge-transfer rate of GN-templates for fast kinetics. Owing to Cu-Ru immiscibility, the coordination of Cu-SAs by N atoms which bridge to Ru-NPs surface, introduces new active sites and brings about long-term stability (over 600 h in acidic media) by preventing aggregation of Ru-NPs.
URI
https://scholarworks.unist.ac.kr/handle/201301/32052
URL
https://www.sciencedirect.com/science/article/pii/S0926337320303118?via%3Dihub
DOI
10.1016/j.apcatb.2020.118896
ISSN
0926-3373
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