Single‐step fabrication of an anode supported planar single‐chamber solid oxide fuel cell

Yunus Sayan,Erdogan Guk,Houzheng Wu,Vijay Venkatesan,Jung‐Sik Kim

doi:10.1111/ijac.13012

Yunus Sayan, Erdogan Guk + Show 3 more

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AbstractWe present single‐step‐co‐sintering manufacture of a planar single‐chamber solid oxide fuel cell (SC‐SOFC) with porous multilayer structures consisting of NiO/CGO, CGO and CGO‐LSCF as anode, electrolyte, and cathode, respectively. Their green tapes were casted with 20 μm thickness and stacked into layers of anode, electrolyte, and cathode (10:2:2), then hot‐pressed at 2 MPa and 60°C for 5 minutes (deemed optimal). Subsequently, hot laminated layers were cut into 40 × 40 mm cells and co‐sintered up to 1200°C via different sintering profiles. Shrinkage behavior and curvature developments of cells were characterized, determining the best sintering profile. Hence, anode‐supported SC‐SOFCs were fabricated via a single‐step co‐sintering process, albeit with curvature formation at edges. Subsequently, anode thickness was increased to 800 μm and electrolyte reduced to 20 μm to obtain SOFCs with drastically reduced curvature with the help of a porous alumina cover plate.

Highlights

We present single-step-co-sintering manufacture of a planar single-chamber solid oxide fuel cell (SC-SOFC) with porous multilayer structures consisting of NiO/ CGO, CGO and CGO-LSCF as anode, electrolyte, and cathode, respectively
An anode-supported SOFC for single-chamber working conditions was made via single-step co-sintering fabrication method
The results show that single-step cosintering is possible to be applied to the area of SOFC

Summary

Introduction

We present single-step-co-sintering manufacture of a planar single-chamber solid oxide fuel cell (SC-SOFC) with porous multilayer structures consisting of NiO/ CGO, CGO and CGO-LSCF as anode, electrolyte, and cathode, respectively. One of the benefits of using SOFC in a single-chamber condition is to tolerate a porous electrolyte structure.[1,3] the porous structure of electrolyte at low sintering temperature can be ignored, though the cell performance is decreased due to lower open circuit voltage (OCV) and higher electrolyte resistance.[14,22,23] In addition, heating rate and cooling rate were carefully defined to prevent any cracking, delamination and curvature formation due to the different shrinkage rate of anode cathode and electrolyte and thermal expansion co-efficient (TEC).[6,24,25]

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