A new vapor deposition method to form composite anodes for solid oxide fuel cells

A solid oxide fuel cell (SOFC) is a complete solid-state energy conversion device with the potential advantages of high efficiency, silent operation, and low emissions. However, the current performance of SOFCs is still limited by a number of problems. Investigations in this field have indicated that it is imperative to fabricate efficient and compatible anodes for SOFCs to minimize polarization loss and to concurrently achieve long-term stability. In this paper, a critical review of previous studies is given and several criteria for the theoretically ideal anode are summarized. Accordingly, a newly developed vapor deposition technique, polarized electrochemical vapor deposition (PEVD), is applied to fabricate composite anodes to meet these criteria. The initial experimental results in the present study show that PEVD is capable of depositing a thin layer of yttria-stabilized zirconia on a porous metallic electrode to form a composite anode. This will not only provide continuous ionic and electronic conducting paths in the anode to reduce the overpotential loss and resistance, but also protect the metallic electrode from further sintering, vapor loss, and poisoning in the harsh SOFC operating conditions.

[1]  D. Ivey,et al.  The Development of Solid Electrochemical Deposition (SED) , 2000 .

[2]  D. Ivey,et al.  Microstructure of polarized electrochemical vapor deposition (PEVD) products , 1998 .

[3]  D. Ivey,et al.  Applying polarized electrochemical vapor deposition (PEVD) for auxiliary phase deposition at working electrodes of gaseous oxide sensors , 1997 .

[4]  T. Etsell,et al.  Polarized electrochemical vapor deposition (PEVD): A new technique for depositing thin ionic conducting films , 1996 .

[5]  S. Sridhar,et al.  Effects of slurry properties on anode cermets for solid oxide fuel cells , 1996 .

[6]  Z. Ogumi,et al.  Novel Method for Preparing Nickel/YSZ Cermet by a Vapor-Phase Process , 1995 .

[7]  K. Ravindranathan Thampi,et al.  Laboratory techniques for evaluating solid oxide fuel cells , 1994 .

[8]  N. Sammes,et al.  Wet powder spraying of a cermet anode for a planar solid oxide fuel cell system , 1994 .

[9]  M. Ippommatsu,et al.  High power density solid oxide electrolyte fuel cells using Ru/Y2O3 stabilized zirconia cermet anodes , 1993 .

[10]  N. Minh.  Ceramic Fuel Cells , 1993 .

[11]  Koichi Eguchi,et al.  Effects of Anode Material and Fuel on Anodic Reaction of Solid Oxide Fuel Cells , 1992 .

[12]  J. Schoonman,et al.  The growth of electrochemical vapor deposited YSZ films , 1992 .

[13]  Y. S. Lin,et al.  Oxygen semipermeable solid oxide membrane composites prepared by electrochemical vapor deposition , 1992 .

[14]  L.G.J. de Haart,et al.  Modified CVD of Nanoscale Structures in and EVD of Thin Layers on Porous Ceramic Membranes , 1991 .

[15]  Masashi Mori,et al.  Characteristics of Slurry‐Coated Nickel Zirconia Cermet Anodes for Solid Oxide Fuel Cells , 1990 .

[16]  M. Mori,et al.  Structure and polarization characteristics of solid oxide fuel cell anodes , 1990 .

[17]  K. Eguchi,et al.  Cathode and anode materials and the reaction kinetics for the solid oxide fuel cell , 1990 .

[18]  Michael Francis Carolan,et al.  Morphology of electrochemical vapor deposited yttria-stabilized zirconia thin films , 1990 .

[19]  Michael Francis Carolan,et al.  Growth rates and mechanism of electrochemical vapor deposited yttria-stabilized zirconia films , 1990 .

[20]  S. C. Singhal,et al.  Electrochemical Vapor Deposition of Yttria‐Stabilized Zirconia Films , 1990 .

[21]  D. Dees,et al.  Conductivity of porous Ni/ZrO/sub 2/-Y/sub 2/O/sub 3/ cermets , 1987 .

[22]  Werner Weppner,et al.  Solid-state electrochemical gas sensors☆ , 1987 .

[23]  A. Isenberg.  Energy conversion via solid oxide electrolyte electrochemical cells at high temperatures , 1981 .

[24]  C. Wagner,et al.  Local Cell Action during the Scaling of Metals, I , 1958 .