A Novel High‐Entropy Perovskite Electrolyte with Improved Proton Conductivity and Stability for Reversible Protonic Ceramic Electrochemical Cells

• DOI: 10.1002/adfm.202311426
• Publication Date: 2023-11-27T23:33:13Z
• Authors: Seeun Oh; Dongyeon Kim; Ho Jin Ryu; Kang Taek Lee
• Keywords: 7. Clean energy; 01 natural sciences; 3. Good health; 0104 chemical sciences

Abstract Reversible protonic ceramic electrochemical cells (R‐PCECs) are emerging as highly efficient energy conversion devices, operating below 650 °C. The primary challenge in advancing R‐PCECs lies developing and stable proton‐conducting electrolytes capable of withstanding the chemical instability caused by common contaminants like CO 2 H O. Herein, a novel high‐entropy perovskite oxide (HEPO) material is introduced, incorporating six equimolar B‐site cations (BaHf 1/6 Sn Zr Ce Y Yb O 3‐δ , BHSZCYYb). total conductivity BHSZCYYb outperforms that examined HEPO other reported variants. Additionally, superior stability observed when exposed to . Utilizing microwave‐assisted sintering method, an R‐PCEC with electrolyte successfully fabricated. This cell exhibits maximum power density 1.151 W cm −2 (650 °C) fuel mode current 2.326 A at 1.3 V electrolysis mode. These results represent highest‐reported values for employing date provide valuable insights into development advancement HEPOs, holding great promise achieving high‐performance R‐PCECs.