Intermediate temperature steam electrolysis using strontium zirconate-based protonic conductors

Abstract Steam electrolysis using SrZr 0.9 Y 0.1 O 3-α (SZY-91) electrolyte was investigated. Different electrode materials, i.e., porous platinum, Sr 0.5 Sm 0.5 CoO 3 (SSC-55) for the anode and nickel for the cathode were examined in order to achieve better energy performance. The electrodes had poor electrode activity when platinum was used for both the anode and the cathode, while the SSC-55 anode displayed significantly low overpotentials and the nickel cathode exhibited low overpotentials upon the introduction of an SrCe 0.95 Yb 0.05 O 3-α (SCYb) interlayer. Moreover, a partial substitution of cerium for zirconium in the strontium zirconate electrolyte, i.e., SrZr 0.5 Ce 0.4 Y 0.1 O 3-α (SZCY-541), was found to be effective for improving the current efficiency of the hydrogen evolution rate. Accordingly, the cell SSC-55|SZCY-541|SCYb|Ni exhibited much higher energy efficiency for the steam electrolysis than the Pt|SZY-91|Pt cell.

[1]  B. Ellis,et al.  Construction and operation of fuel cells based on the solid electrolyte BaCeO3:Gd , 1991 .

[2]  H. Matsumoto,et al.  Study on current efficiency of steam electrolysis using a partial protonic conductor SrZr0.9Yb0.1O3−α , 2001 .

[3]  H. Iwahara,et al.  Proton conduction in sintered oxides and its application to steam electrolysis for hydrogen production , 1981 .

[4]  H. Matsumoto,et al.  Hydrogen separation from syngas using high-temperature proton conductors , 2007 .

[5]  Takashi Hibino,et al.  Protonic conduction in calcium, strontium and barium zirconates , 1993 .

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

[7]  J. Schoonman,et al.  Synthesis of strontium and barium cerate and their reaction with carbon dioxide , 1993 .

[8]  T. Takagi,et al.  Kinetic studies of the reaction at the nickel pattern electrode on YSZ in H2H2O atmospheres , 1994 .

[9]  H. Matsumoto,et al.  High performance of electroless-plated platinum electrode for electrochemical hydrogen pumps using strontium-zirconate-based proton conductors , 2008 .

[10]  H. Matsumoto,et al.  Electrochemical hydrogen pump using a high-temperature-type proton conductor: Improvement of pumping capacity , 2001 .

[11]  H. Matsumoto,et al.  Hydrogen separation using proton-conducting perovskites , 2006 .

[12]  H. Iwahara,et al.  Studies on solid electrolyte gas cells with high-temperature-type proton conductor and oxide ion conductor , 1983 .

[13]  H. Iwahara,et al.  Relation between proton and hole conduction in SrCeO3-based solid electrolytes under water-containing atmospheres at high temperatures , 1983 .

[14]  H. Iwahara,et al.  High temperature fuel and steam electrolysis cells using proton conductive solid electrolytes , 1982 .

[15]  K. Kreuer,et al.  On the development of proton conducting materials for technological applications , 1997 .

[16]  F. Henn,et al.  Characterization of Gd, Yb and Nd doped barium cerates as proton conductors , 1993 .

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

[18]  Miho Honda,et al.  Intermediate Temperature Solid Oxide Fuel Cells Using a New LaGaO3 Based Oxide Ion Conductor I. Doped as a New Cathode Material , 1998 .

[19]  N. Bonanos,et al.  Effect of electrode material on the oxidation of H2 at the metal–Sr0.995Ce0.95Y0.05O2.970 interface , 2000 .

[20]  H. Matsumoto,et al.  Current efficiency of electrochemical hydrogen pumping using a high-temperature proton conductor SrCe0.95Yb0.05O3-α , 2000 .

[21]  H. Matsumoto,et al.  Hydrogen Separation from Reformed Gases Using High-Temperature Proton Conductors , 2004 .

[22]  A. Nowick,et al.  High-temperature protonic conductors with perovskite-related structures , 1995 .

[23]  H. Matsumoto,et al.  Effect of Dispersion of Nanosize Platinum Particles on Electrical Conduction Properties of Proton-Conducting Oxide SrZr0.9Y0.1O3 − α , 2007 .

[24]  H. Matsumoto.  Extraction and production of hydrogen using high-temperature proton conductor , 2002 .