Improved catalytic activity under internal reforming solid oxide fuel cell over new rhodium-doped perovskite catalyst

Ghun Sik Kim, Byung Yong Lee, Grazia Accardo, Hyung Chul Ham, Jooho Moon, Sung Pil Yoon

Research output: Contribution to journalArticle

Abstract

The catalytic partial oxidation of methane is evaluated over a Rh (2–15 mol%)-doped Sr0.92Y0.08TiO3-δ (SYT) perovskite-based catalyst prepared by the Pechini method for fuel-cell applications. The Rh dopant replaces titanium in the SYT catalyst, resulting in a catalyst with excellent and stable catalytic performance during thermal cycling in the temperature range 600–900 °C and in long-term stability tests at 750 °C for 130 h, without deactivation due to carbon coking or sintering. A systematic round-robin characterization is carried out by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, and CO chemisorption to establish the chemical and physical properties of the catalyst. Adding Rh as a dopant in the catalyst significantly promotes the catalytic activity due to the presence of exsoluted rhodium particles on the catalyst surface. Small particles (2–5 nm) of Rh on the SYT surface are observed to be evenly dispersed, without agglomeration, and the turnover frequency (TOF) of the POM reaction increased. In the long-term stability tests, catalysts are tested in direct internal reforming at an SOFC anode, achieving high methane conversion (∼99%) in both dry and wet conditions.

Original languageEnglish
Pages (from-to)305-315
Number of pages11
JournalJournal of Power Sources
Volume423
DOIs
Publication statusPublished - 2019 May 31

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Rhodium
solid oxide fuel cells
Reforming reactions
Solid oxide fuel cells (SOFC)
rhodium
Perovskite
catalytic activity
Catalyst activity
catalysts
Catalysts
stability tests
Methane
methane
Doping (additives)
Coking
Thermal cycling
Carbon Monoxide
Chemisorption
agglomeration
perovskite

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Cite this

Kim, Ghun Sik ; Lee, Byung Yong ; Accardo, Grazia ; Ham, Hyung Chul ; Moon, Jooho ; Yoon, Sung Pil. / Improved catalytic activity under internal reforming solid oxide fuel cell over new rhodium-doped perovskite catalyst. In: Journal of Power Sources. 2019 ; Vol. 423. pp. 305-315.
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Improved catalytic activity under internal reforming solid oxide fuel cell over new rhodium-doped perovskite catalyst. / Kim, Ghun Sik; Lee, Byung Yong; Accardo, Grazia; Ham, Hyung Chul; Moon, Jooho; Yoon, Sung Pil.

In: Journal of Power Sources, Vol. 423, 31.05.2019, p. 305-315.

Research output: Contribution to journalArticle

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