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Measuring individual overpotentials in an operating solid-oxide electrochemical cell

Farid El Gabaly ; Anthony McDaniel ; Michael Grass ; Zhi Liu ; Henrick Bluhm ; Mark Linne (Institutionen för tillämpad mekanik, Förbränning) ; Zahid Hussain ; Roger Farrow ; Kevin McCarty
Physical Chemistry Chemical Physics (1463-9076). Vol. 12 (2010), 38, p. 12138-12145.
[Artikel, refereegranskad vetenskaplig]

We use photo-electrons as a non-contact probe to measure local electrical potentials in a solid-oxide electrochemical cell. We characterize the cell in operando at near-ambient pressure using spatially-resolved X-ray photoemission spectroscopy. The overpotentials at the interfaces between the Ni and Pt electrodes and the yttria-stabilized zirconia (YSZ) electrolyte are directly measured. The method is validated using electrochemical impedance spectroscopy. Using the overpotentials, which characterize the cell’s inefficiencies, we compare without ambiguity the electro-catalytic efficiencies of Ni and Pt, finding that on Ni H2O splitting proceeds more rapidly than H2 oxidation, while on Pt, H2 oxidation proceeds more rapidly than H2O splitting.



Denna post skapades 2010-10-08. Senast ändrad 2015-07-28.
CPL Pubid: 127403

 

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Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Förbränning

Ämnesområden

Annan fysik

Chalmers infrastruktur