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Kim, Kwang S.
Center for Superfunctional Materials (CSM)
Research Interests
  • Theoretical/experimental nanosciences, molecular electronics spectroscopy, energy materials

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Surface enrichment of iridium on IrCo alloys for boosting hydrogen production

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Title
Surface enrichment of iridium on IrCo alloys for boosting hydrogen production
Author
Dang, Ngoc KimUmer, MuhammadThangavel, PandiarajanSultan, SirajTiwari, Jitendra N.Lee, Jong HoonKim, Min GyuKim, Kwang S.
Issue Date
2021-08
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v.9, no.31, pp.16898 - 16905
Abstract
We report a facile synthesis of an Ir surface-enriched IrCo alloy catalyst and its excellent activity which outperforms commercial Pt/C for the hydrogen evolution reaction (HER) in acidic media showing fast kinetics. The as-synthesized catalyst exhibits low overpotentials of merely 9 mV and 29.3 mV to afford current densities of 10 and 100 mA cm(-2), respectively, a turnover frequency of 1.25 s(-1), a low Tafel slope of 23.7 mV dec(-1), and stability for 100 h at a high current density of 100 mA cm(-2) in 0.5 M H2SO4 electrolyte. Experiments and density functional theory (DFT) calculations indicate that the enrichment of Ir atoms on the outer surface of IrCo alloys is responsible for the effectively optimized free energy of hydrogen adsorption, which boosts the kinetics and HER performance. Our finding provides an insight into the metal surface enrichment on alloy nanoparticles (NPs).
URI
https://scholarworks.unist.ac.kr/handle/201301/53791
URL
https://pubs.rsc.org/en/content/articlelanding/2021/TA/D1TA02597J
DOI
10.1039/d1ta02597j
ISSN
2050-7488
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CHM_Journal Papers
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