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Replacement effect of fresh electrolyte on the accelerated deactivation test and recovery process of Pt/C catalysts in a half-cell system

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2022, 32(1), pp.313-319
  • DOI : 10.1007/s42823-021-00310-w
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : October 14, 2021
  • Accepted : November 24, 2021
  • Published : January 1, 2022

Kim Han Young 1 Im Dae Soon 1 Son U.-Hyeok 1 Lee Hae Ri 2 Joh Han-Ik 2

1건국대학교 에너지공학과
2건국대학교

Accredited

ABSTRACT

The poor durability issue of polymer electrolyte membrane fuel cells is a major concern in terms of their commercialization. To understand the degradation mechanism of the catalysts, an accelerated durability test (ADT) was conducted according to the protocol established by internationally accredited organizations. However, reversible and irreversible factors contributing to the loss of activity have not yet been practically segregated because of the limitations of a batch-type three-electrode system, leading to the misunderstanding of the deactivation mechanism. In this study, we investigated the effect of a fresh electrolyte on the ADT and recovery process. When the fresh electrolyte was used at every range of the cycle, the chances of incorrect detection of dissolved CO and Pt ions in the electrolyte were very low. When the same electrolyte was used throughout the test, the accumulated Pt ions were deposited on the surface of the Pt nanoparticles or carbon support, affording an increased electrochemical surface area (ECSA) of Pt. Therefore, we believe that periodic replacement by a fresh electrolyte or a continuous-flow electrolyte is essential for the precise determination of the structural and electrochemical changes in Pt/C catalysts.

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This paper was written with support from the National Research Foundation of Korea.