Local Structural Disorder Enhances the Oxygen Reduction Reaction Activity of Carbon-Supported Low Pt Loading CoPt Nanocatalysts

Dinesh Bhalothia, Yu Jui Fan, Tzu Hsi Huang, Zi Jun Lin, Ya Tang Yang, Kuan Wen Wang, Tsan Yao Chen

Research output: Contribution to journalArticle

Abstract

A facile strategy for preparing carbon-supported Co95Pt5 nanocatalysts (NCs) with low platinum (Pt) loading and high Pt utilization via thermal reduction treatment in a carbon monoxide (CO) atmosphere is reported. By cross-referencing results of microscopy, X-ray spectroscopy, and electrochemical analysis, we demonstrate that the Pt atoms tend to form disordered atomic clusters capping on the Co nanoparticle surface. The values of unfilled d-states (hTs) extracted from X-ray absorption near-edge spectroscopy were used to calculate the d-band vacancies of Pt. Accordingly, CoPt-CO570 (reduced in CO at 570 K) possesses the lowest hTs value (0.302) (i.e., the lowest Pt d-band vacancies) among experimental samples, indicating a strong electron relocation from Co atoms. Such electron relocations are attributed to the high extent of the heteroatomic intermix between Pt and Co atoms and thus improves the oxygen reduction reaction activity of CoPt-CO570. For providing further evidence, structural and electrochemical properties for H2 and NaBH4 reduction-prepared CoPt NCs are compared as the control. This work may represent an appealing step toward the structural design of low Pt and high activity catalysts for fuel cell cathode catalysts.

Original languageEnglish
Pages (from-to)19013-19021
Number of pages9
JournalJournal of Physical Chemistry C
Volume123
Issue number31
DOIs
Publication statusPublished - Aug 8 2019

Fingerprint

Platinum
platinum
Carbon
disorders
Oxygen
carbon
oxygen
relocation
Relocation
Carbon Monoxide
Carbon monoxide
Atoms
carbon monoxide
Vacancies
cell cathodes
atoms
catalysts
atomic clusters
structural design
Electrons

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

Local Structural Disorder Enhances the Oxygen Reduction Reaction Activity of Carbon-Supported Low Pt Loading CoPt Nanocatalysts. / Bhalothia, Dinesh; Fan, Yu Jui; Huang, Tzu Hsi; Lin, Zi Jun; Yang, Ya Tang; Wang, Kuan Wen; Chen, Tsan Yao.

In: Journal of Physical Chemistry C, Vol. 123, No. 31, 08.08.2019, p. 19013-19021.

Research output: Contribution to journalArticle

Bhalothia, Dinesh ; Fan, Yu Jui ; Huang, Tzu Hsi ; Lin, Zi Jun ; Yang, Ya Tang ; Wang, Kuan Wen ; Chen, Tsan Yao. / Local Structural Disorder Enhances the Oxygen Reduction Reaction Activity of Carbon-Supported Low Pt Loading CoPt Nanocatalysts. In: Journal of Physical Chemistry C. 2019 ; Vol. 123, No. 31. pp. 19013-19021.
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