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Junyoung Kim, Areum Jun, Ohhun Gwon, Seonyoung Yoo, Meilin Liu, Jeeyoung Shin, Tak-Hyoung Lim, Guntae Kim
Elsevier BV
Energy, Materials Science, Engineering, Solid oxide electrolysis cell, Protonic oxide electrolysis cell, Hydrogen production, Water electrolysis
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Water electrolysis based on a solid oxide electrolysis cell (SOEC) has potential to be cost-effective, environmentally friendly, and highly efficient for hydrogen production. There are two types of SOECs, depending on electrolyte materials: oxygen ion conducting SOECs (oxygen-SOECs) and proton conducting SOECs (proton-SOECs). Here we report our new findings in exploring a SOEC based on a mixed-ion conductor that can transport both oxygen ion and proton at the same time, which is denoted as “Hybrid-SOEC”. When BaZr 0.1 Ce 0.7 Y 0.1 Yb 0.1 O 3-δ was used as an electrolyte, the Hybrid SOEC shows the highest efficiency, demonstrating a current density of 3.16 A cm −2 at 1.3 V and 750 °C in 10% humidified hydrogen at hydrogen electrode and 10% humidified air at air electrode. Moreover, the Hybrid SOEC exhibits no observable degradation in performance for more than 60 h of continuous operation, implying a robust system for hydrogen production.

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