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Research Papers

Effect of the Current Collector on Performance of Anode-Supported Microtubular Solid Oxide Fuel Cells

[+] Author and Article Information
Michele Casarin

Department of Industrial Engineering,
University of Trento,
Via Mesiano 77,
Trento 38123, Italy
e-mail: michele.casarin@ing.unitn.it; nirasac@gmail.com

Vincenzo M. Sglavo

Department of Industrial Engineering,
University of Trento,
Via Sommarive 9,
Trento 38123, Italy
e-mail: vincenzo.sglavo@unitn.it

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY. Manuscript received April 22, 2014; final manuscript received December 15, 2014; published online March 10, 2015. Assoc. Editor: Dr Masashi Mori.

J. Fuel Cell Sci. Technol 12(3), 031005 (Jun 01, 2015) (6 pages) Paper No: FC-14-1050; doi: 10.1115/1.4029875 History: Received April 22, 2014; Revised December 15, 2014; Online March 10, 2015

Microtubular anode-supported solid oxide fuel cells (μt-SOFC) were created with a metallic coil embedded in the anode to act as current collector. The electrochemical performance was experimentally examined by comparing the power density (PD) of μt-SOFC with embedded coils of different turns per unit length and composition (nickel and palladium). It is shown that an increase in the turns per unit length results in a proportional current density increase and in a quadratic increment of PD. Additional performance improvement is found for the cell with palladium current collector due to the higher catalytic activity for hydrogen oxidation.

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Figures

Grahic Jump Location
Fig. 3

Voltage and PD versus current density for μt-SOFC with nickel current collector (a) and with palladium current collector (b) adopting a straight palladium wire for the anode current collection

Grahic Jump Location
Fig. 2

SEM micrographs of μt-SOFC after sintering with Ni-current collector obtained from 0.5 mm diameter carbon-base rod with 6 turns/cm (6-5 Ni) (a), 11 turns/cm (11-5 Ni) (b), μt-SOFC with Pd-current collector obtained from 0.5 mm diameter carbon-base rod with 6 turns/cm (6-5 Pd) (c), 11 turns/cm (11-5 Pd) (d), 0.7 mm diameter carbon-base rod with 5.5 turns/cm (6-7 Pd) (e), and cathode, electrolyte, and anode layers microstructure after electrochemical test (f)

Grahic Jump Location
Fig. 1

Schematic of the current collector, carbon-base rod, and μt-SOFC with embedded current collector (a); 0.5 mm carbon-base rod with metallic coil wound around with 6 and 11 turns/cm (b); μt-SOFC (1.4 mm outer diameter) with Pd-current collector and metallic leads available at both ends (c); and μt-SOFC (1.0 mm outer diameter) with Pd-integrated-current collector connection and alumina capillaries (d)

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