Selective dealloying of chemically disordered Pt-Ni bimetallic nanoparticles for the oxygen reduction reaction

Tae Yeol Jeon, Han Koo Lee, Geon Hee Yoon, Si Hwan Lee, Hyung Joong Yun, Ki Jeong Kim, Kug Seung Lee, Nicola Pinna, Seung Ho Yu

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Changes in electronic and compositional structures of Pt-Ni electrocatalysts with 44% of Ni fraction with repeated chemical dealloying have been studied. By comparing the Pt-enriched surfaces formed using hydroquinone and sulfuric acid as a leaching agent, we found that hydroquinone generated Pt-enriched surfaces exhibit the highest oxygen reduction reaction (ORR) activity after repeating the treatment twice. In particular, it was found that while sulfuric acid causes an uncontrollable dissolution of Ni clusters, the unique selectivity of hydroquinone allows the preferential dissolution of Ni atoms alloyed with Pt. Despite its wide usage in the field, the results show that traditional acid leaching is unsuitable for Pt-Ni alloys with a high Ni content and an incomplete alloying level. We finally proved that the unique and lasting selectivity of hydroquinone enables an incompletely alloyed Pt-Ni catalyst to obtain a highly ORR active Pt shell region without an extensive loss of Ni.

Original languageEnglish
Pages (from-to)1136-1144
Number of pages9
JournalNanoscale
Volume15
Issue number3
DOIs
Publication statusPublished - 2022 Jul 12

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean Government (MSIT) (No. 2019R1F1A1062193).

Publisher Copyright:
© 2023 The Royal Society of Chemistry.

ASJC Scopus subject areas

  • General Materials Science

Fingerprint

Dive into the research topics of 'Selective dealloying of chemically disordered Pt-Ni bimetallic nanoparticles for the oxygen reduction reaction'. Together they form a unique fingerprint.

Cite this