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Yang, Changduk
Advanced Tech-Optoelectronic Materials Synthesis Lab (ATOMS)
Research Interests
  • Optoelectronic materials synthesis/organic electronics, functionalization of carbonaceous solids, advanced materials chemistry, macromolecular chemistry

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Balancing hydrogen adsorption/desorption by orbital modulation for efficient hydrogen evolution catalysis

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Title
Balancing hydrogen adsorption/desorption by orbital modulation for efficient hydrogen evolution catalysis
Author
Li, FengHan, Gao-FengNoh, Hyuk-JunJeon, Jong-PilAhmad, IshfaqChen, ShanshanYang, ChangdukBu, YunfeiFu, ZhengpingLu, YalinBaek, Jong-Beom
Issue Date
2019-09
Publisher
NATURE PUBLISHING GROUP
Citation
NATURE COMMUNICATIONS, v.10, pp.4060
Abstract
Hydrogen adsorption/desorption behavior plays a key role in hydrogen evolution reaction (HER) catalysis. The HER reaction rate is a trade-off between hydrogen adsorption and desorption on the catalyst surface. Herein, we report the rational balancing of hydrogen adsorption/desorption by orbital modulation using introduced environmental electronegative carbon/nitrogen (C/N) atoms. Theoretical calculations reveal that the empty d orbitals of iridium (Ir) sites can be reduced by interactions between the environmental electronegative C/N and Ir atoms. This balances the hydrogen adsorption/ desorption around the Ir sites, accelerating the related HER process. Remarkably, by anchoring a small amount of Ir nanoparticles (7.16 wt%) in nitrogenated carbon matrixes, the resulting catalyst exhibits significantly enhanced HER performance. This includs the smallest reported overpotential at 10 mA cm(-2) (4.5 mV), the highest mass activity at 10 mV (1.12 A mg(Ir)(-1)) and turnover frequency at 25 mV (4.21 H2 s(-1)) by far, outperforming Ir nanoparticles and commercial Pt/C.
URI
https://scholarworks.unist.ac.kr/handle/201301/30370
URL
https://www.nature.com/articles/s41467-019-12012-z
DOI
10.1038/s41467-019-12012-z
ISSN
2041-1723
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ECHE_Journal Papers
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