Abstract
Heterogeneous Pt-Ru catalysts are synthesized by atomic layer deposition (ALD) of Ru onto a porous Pt mesh and employed as the anode in direct methanol solid oxide fuel cells (DMSOFCs). The degree of Ru coverage is controlled by the number of deposition cycles employed in catalyst preparation; samples are prepared using 50, 100, 200, 300, and 400 cycles. The dispersed nature of the ALD Ru coating is confirmed by auger electron spectroscopy and high-resolution transmission electron microscopy. DMSOFC performance is measured at several temperatures between 300 and 450 °C. Optimal ALD Ru coverage results in DMSOFC power and electrode impedance values close to ones from SOFCs with Pt electrodes running on hydrogen. Thermal stability is also improved significantly, preventing agglomeration of the Pt mesh. X-ray photoelectron spectroscopy is used to analyze the chemical properties of the surface and confirms that increased ALD Ru coverage results in a dramatic reduction in the amount of surface-bound carbon monoxide (CO) present after cell operation. This suggests that improved anode kinetics resulted from the reduction of the CO-passivated Pt layer.
| Original language | English |
|---|---|
| Pages (from-to) | 1914-1921 |
| Number of pages | 8 |
| Journal | ACS Catalysis |
| Volume | 5 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2015 Mar 6 |
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Keywords
- atomic layer deposition
- direct methanol solid oxide fuel cell
- heterogeneous catalysts
- platinum
- ruthenium
ASJC Scopus subject areas
- Catalysis
Cite this
Platinum-ruthenium heterogeneous catalytic anodes prepared by atomic layer deposition for use in direct methanol solid oxide fuel cells. / Jeong, Heon Jae; Kim, Jun Woo; Bae, Kiho; Jung, Hojean; Shim, Joon Hyung.
In: ACS Catalysis, Vol. 5, No. 3, 06.03.2015, p. 1914-1921.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Platinum-ruthenium heterogeneous catalytic anodes prepared by atomic layer deposition for use in direct methanol solid oxide fuel cells
AU - Jeong, Heon Jae
AU - Kim, Jun Woo
AU - Bae, Kiho
AU - Jung, Hojean
AU - Shim, Joon Hyung
PY - 2015/3/6
Y1 - 2015/3/6
N2 - Heterogeneous Pt-Ru catalysts are synthesized by atomic layer deposition (ALD) of Ru onto a porous Pt mesh and employed as the anode in direct methanol solid oxide fuel cells (DMSOFCs). The degree of Ru coverage is controlled by the number of deposition cycles employed in catalyst preparation; samples are prepared using 50, 100, 200, 300, and 400 cycles. The dispersed nature of the ALD Ru coating is confirmed by auger electron spectroscopy and high-resolution transmission electron microscopy. DMSOFC performance is measured at several temperatures between 300 and 450 °C. Optimal ALD Ru coverage results in DMSOFC power and electrode impedance values close to ones from SOFCs with Pt electrodes running on hydrogen. Thermal stability is also improved significantly, preventing agglomeration of the Pt mesh. X-ray photoelectron spectroscopy is used to analyze the chemical properties of the surface and confirms that increased ALD Ru coverage results in a dramatic reduction in the amount of surface-bound carbon monoxide (CO) present after cell operation. This suggests that improved anode kinetics resulted from the reduction of the CO-passivated Pt layer.
AB - Heterogeneous Pt-Ru catalysts are synthesized by atomic layer deposition (ALD) of Ru onto a porous Pt mesh and employed as the anode in direct methanol solid oxide fuel cells (DMSOFCs). The degree of Ru coverage is controlled by the number of deposition cycles employed in catalyst preparation; samples are prepared using 50, 100, 200, 300, and 400 cycles. The dispersed nature of the ALD Ru coating is confirmed by auger electron spectroscopy and high-resolution transmission electron microscopy. DMSOFC performance is measured at several temperatures between 300 and 450 °C. Optimal ALD Ru coverage results in DMSOFC power and electrode impedance values close to ones from SOFCs with Pt electrodes running on hydrogen. Thermal stability is also improved significantly, preventing agglomeration of the Pt mesh. X-ray photoelectron spectroscopy is used to analyze the chemical properties of the surface and confirms that increased ALD Ru coverage results in a dramatic reduction in the amount of surface-bound carbon monoxide (CO) present after cell operation. This suggests that improved anode kinetics resulted from the reduction of the CO-passivated Pt layer.
KW - atomic layer deposition
KW - direct methanol solid oxide fuel cell
KW - heterogeneous catalysts
KW - platinum
KW - ruthenium
UR - http://www.scopus.com/inward/record.url?scp=84924274324&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84924274324&partnerID=8YFLogxK
U2 - 10.1021/cs502041d
DO - 10.1021/cs502041d
M3 - Article
VL - 5
SP - 1914
EP - 1921
JO - ACS Catalysis
JF - ACS Catalysis
SN - 2155-5435
IS - 3
ER -