Tailoring the Oxygen Vacancy to Achieve Fast Intrinsic Proton Transport in a Perovskite Cathode for Protonic Ceramic Fuel Cells

• DOI: 10.1021/acsaem.0c00486
• Publication Date: 2020-04-22T17:01:27Z
• Authors: Rongzheng Ren; Zhenhua Wang; Xingguang Meng; Xinhua Wang; Chunming Xu; Jinshuo Qiao; Wang Sun; Kening Sun
• Keywords: Oxygen transport; Proton Transport

Protonic ceramic fuel cells (PCFCs) are receiving increasing attention because of their high energy conversion efficiency. However, traditional mixed oxygen-ionic and electronic conductors (MOECs) show sluggish oxygen reduction kinetics when used in PCFCs intrinsic low protonic conductivity. Herein, it is reported that cooperatively regulating the concentration basicity vacancies can result fast proton transport MOECs, which demonstrated a Zr4+-doped Sr2Fe1.5Mo0.5O6−δ (SFMZ) perovskite. The so-obtained SFMZ perovskite renders plentiful strong hydration ability, boost formation defects. Furthermore, chemical diffusion coefficient protons (DH,chem) established first to determine mobility cathode. results indicate exhibits improved with DH,chem value 8.71 × 10–7 cm2 s–1 at 700 °C, comparable commonly electrolyte BaZr0.1Ce0.7Y0.1Yb0.1O3−δ 1.84 10–6 s–1. A polarization resistance 0.169 Ω peak power density as 0.79 W cm–2 were achieved °C Such excellent performance suggests rationally tailoring vacancy feasible strategy promote perovskite-structured electrode materials efficient PCFC cathodes.