Description: Efficient intermediate-temperature steam electrolysis with Y : SrZrO 3 –SrCeO 3 and Y : BaZrO 3

This title appears in the Scientific Report : 2018

Efficient intermediate-temperature steam electrolysis with Y : SrZrO 3 –SrCeO 3 and Y : BaZrO 3 –BaCeO 3 proton conducting perovskites

Ceramic proton conductors have the potential to become important components in future clean and efficient energy technologies. In this manuscript, barium cerium yttrium zirconate (Ba(Zr0.5Ce0.4)8/9Y0.2O2.9) and strontium cerium yttrium zirconate (SrZr0.5Ce0.4Y0.1O2.95), proton conducting perovskites...

Personal Name(s):	Leonard, Kwati (Corresponding author)
	Okuyama, Yuji / Takamura, Yasuhiro / Lee, Young-Sung / Miyazaki, Kuninori / Ivanova, Mariya / Meulenberg, Wilhelm Albert / Matsumoto, Hiroshige (Corresponding author)
Contributing Institute:	Werkstoffsynthese und Herstellungsverfahren; IEK-1
Published in:	Journal of materials chemistry / A, 6 (2018) S. 19113-19124
Imprint:	London [u.a.] RSC 2018
DOI:	10.1039/C8TA04019B
Document Type:	Journal Article
Research Program:	Methods and Concepts for Material Development
	Publikationsportal JuSER

Please use the identifier: http://dx.doi.org/10.1039/C8TA04019B in citations.

Ceramic proton conductors have the potential to become important components in future clean and efficient energy technologies. In this manuscript, barium cerium yttrium zirconate (Ba(Zr0.5Ce0.4)8/9Y0.2O2.9) and strontium cerium yttrium zirconate (SrZr0.5Ce0.4Y0.1O2.95), proton conducting perovskites were employed as solid oxide electrolysis cell (SOEC) electrolytes for hydrogen production via intermediate temperature steam electrolysis at 550 and 600 °C. Cathode-supported button cells examined for a 12 μm Ba(Zr0.5Ce0.4)8/9Y0.2O2.9 electrolyte, with Ni–SrZr0.5Ce0.4Y0.1O2.95 as the H2-electrode, and porous Ba0.5La0.5CoO3 as the anode reached current densities of 0.2 and 0.5 A cm−2 with applied voltage of 1.45 V, at 550 and 600 °C, respectively. Moreover, a hydrogen evolution rate of 127 μmol cm−2 per minute was achieved at 0.5 A cm−2, translating to a current efficiency of 82%. In addition, excellent cell performance was obtained using SrZr0.5Ce0.4Y0.1O2.95 as an electrolyte. Current densities of 0.2 and 0.5 A cm−2 were obtained at 600 °C with applied voltages of 1.28 and 1.63 V, achieving faradaic current efficiencies of 88 and 85%. The NiO–SrZr0.5Ce0.4Y0.1O3−δ composite cathode was more favorable for the densification of the supported Ba(Zr0.5Ce0.4)8/9Y0.2O2.9 electrolyte during sintering and could be promising for use as a cathode substrate in proton-conducting SOECs.