期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 34, 页码 38275-38284出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c12532
关键词
solid-oxide electrolysis cell; solid-oxide fuel cell; proton conducting electrolyte; chemical stability; perovskite-type oxides
资金
- U.S. Army Ground Vehicle System Center under DOE Idaho Operations Office [18703]
- Strategic Partnership Program (SPP)
- Idaho National Laboratory
- Lumigen Instrument Centre at Wayne State University [NSF: MRI 1427926, NSF: MRI 0922912]
Solid oxide electrolysis cells (SOECs) are devices that enable economically viable production of clean fuel such as hydrogen gas, which can be used in many industrial applications and serving as an energy carrier for renewable energy sources. Operation of SOEC at intermediate temperature (IT) range (400 to 600 degrees C) is highly attractive because many unexploited heat sources from industries can be utilized. Proton conducting SOECs based on barium-zirconium-cerate electrolytes show great potential for operating at this temperature range due to their high proton conductivity at reduced temperatures. In this study, a new tridoped BaCe0.5Zr0.2Y0.1Yb0.1Gd0.1O3-delta (BCZYYbGd) electrolyte with very high chemical stability and proton conductivity is coupled with a PrNi0.5Co0.5O3-delta steam electrode and a Ni-BCYYbGd hydrogen electrode for IT-SOEC operation. The dopants of the electrolyte were carefully designed to obtain the optimum stability and conductivity for IT-SOEC. The BCYYbGd electrolyte was stable over 200 h at 50 vol % steam in argon and at 600 degrees C, and a very high electrolysis current density of 2.405 A cm(-2) was obtained at 600 degrees C and 1.6 Vat 20 vol % of steam in argon. This system was also found to be highly reversible, exhibiting very high performance in SOFC mode and suggesting a potential candidate for next generation proton conducting electrolyte.
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