Proton-conducting ceramics for water electrolysis and hydrogen production at elevated pressure
نویسندگان
چکیده
Pressurized operation is advantageous for many electrolysis and electrosynthesis technologies. The effects of pressure have been studied extensively in conventional oxygen-ion conducting solid-oxide electrochemical cells. In constrast, very few studies examined pressurized proton-conducting electroceramics. Protonic ceramics offer high proton conductivity at intermediate temperatures (∼400–600°C) that are well-matched to important thermochemical synthesis processes. can bring significant additional benefits and/or provide access synthetic pathways otherwise unavailable or thermodynamically disfavorable under ambient conditions higher- lower-temperature devices. Here we examine steam protonic-ceramic unit-cell stacks based on a BaCe 0.4 Zr Y 0.1 Yb O 3− δ (BCZYYb4411) electrolyte, Ni–BZCYYb4411 composite negatrode (fuel electrode) BaCo Fe (BCFZY) positrode (air-steam electrode). cells packaged within stacks, including metallic interconnects, current collectors, sealing glasses gaskets sealed by mechanical compression. assembly stainless steel vessel performance characterization elevated pressure. Protonic-ceramic electrolyzer analyzed 550°C pressures up 12 bar . Increasing the operating from 2.1 12.6 enables 40% overall decrease over-potential required drive 500 mA cm −2 , with 33% cell ohmic resistance 60% polarization resistance. Faradaic efficiency also found increase These improvements attributed faster electrode kinetics, improved gas transport, beneficial changes defect equilibria which more than compensate slight Nernst potential brought operation. Electrochemical impedance spectroscopy (EIS) coupled distribution relaxation time (DRT) analysis provides greater insight into fundamental processes altered
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ژورنال
عنوان ژورنال: Frontiers in Energy Research
سال: 2022
ISSN: ['2296-598X']
DOI: https://doi.org/10.3389/fenrg.2022.1020960