Journal
SMALL
Volume 18, Issue 35, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202204063
Keywords
hydrogen evolution reaction; IrPdH; new H source; ultrafine structure; whole pH range
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Funding
- National Natural Science Foundation of China [22109073, 21875112]
- National and Local Joint Engineering Research Center of Biomedical Functional Materials
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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This paper proposes a method to improve the activity and stability of the HER electrocatalyst by in situ chemical intercalation of H into ultrafine Pd, forming ultrafine IrPdH hydride. The results demonstrate that IrPdH shows superior activity and stability in various pH conditions.
Engineering Pt-free catalysts for hydrogen evolution reaction (HER) with high activity and stability is of great significance in electrochemical hydrogen production. Herein, in situ chemical H intercalation into ultrafine Pd to activate this otherwise HER-inferior material to form the ultrafine IrPdH hydride as an efficient and stable HER electrocatalyst is proposed. The formation of PdIrH depends on a new hydrogenation strategy via using ethanol as the hydrogen resource. It is demonstrated that H atoms in IrPdH originate from the -OH and -CH2- of ethanol, which fills the gap of ethanol as the hydrogen source for the preparation of Pd hydride. Thanks to the incorporation of H/Ir atoms and ultrafine structure, the IrPdH exhibits superior HER activity and stability in the whole pH range. The IrPdH delivers very low overpotentials of 14, 25 and 60 mV at a current density of 10 mA cm(-2) respectively in 0.5 m H2SO4, 1 m KOH, and 1 m PBS electrolytes, which are much better than those of commercial Pt/C and most reported noble metal electrocatalysts. Theoretical calculations confirm that interstitial hydrogen availably refines the electronic density of Pd and Ir sites, which optimizes the adsorption of *H and leads to the significant enhancement of HER performance.
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