Boosting antioxidation efficiency of nonstoichiometric CeOx nanoparticles via surface passivation toward robust polymer electrolyte membrane fuel cells

Seung Ho Yook, Ho Young Kim, Seok Jun Kim, Seungjoo Choi, Taehyun Kwon, Handong Cho, Jun Myung Kim, Ki Ro Yoon, Sunhee Jo, So Young Lee, Hyoung Juhn Kim, Hae Jung Son, Keun Hwa Chae, Jeongho Kim, Kwan Young Lee, Jin Young Kim

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Nonstoichiometric cerium oxide (CeOx) nanomaterials are considered the most efficient radical scavengers with regenerative redox behavior and are emerging as a pivotal ingredient to secure long-lasting energy conversion devices. However, the environment of energy conversion reactions, which hampers a regeneration of Ce chemical states and severely degrades CeOx antioxidation efficiency, engenders the thirst for CeOx surface passivation strategies that confer high colloidal stability, robust chemical durability, and efficient radical scavenging performance. Here, as a proof-of-concept study, we suggest that chemically durable mesoporous silica (mSiO2) shells with high colloidal stability in polar media boost CeOx antioxidation efficiency. The mSiO2 enabled the even dispersion of the CeOx nanoparticles (NPs) in polar media, effectively mitigated radical scavenging activity degradation, and an increased ratio of highly active Ce(III) states. Importantly, a proton exchange membrane (PEM) based on the CeOx/mSiO2 core/shell exhibited a much lower disintegration rate during the Fenton's test than the CeOx-based PEM and the pristine one. Furthermore, in fuel cell tests, the CeOx/mSiO2-based PEM demonstrated excellent durability preserving 91.7% of initial maximum power density after 100 h-durability tests, while other PEMs underwent drastic performance degradation. In addition, systematic modulation of structural factors in CeOx/mSiO2 allowed demonstrating the multifunctionality of the mSiO2 shell.

Original languageEnglish
Article number134419
JournalChemical Engineering Journal
Volume432
DOIs
Publication statusPublished - 2022 Mar 15

Keywords

  • Antioxidants
  • Cerium oxide
  • Polymer electrolyte membrane fuel cells
  • Reinforced composite membranes
  • Surface passivation

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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