[1Ea01-05] International Online Session (hybrid oral session)

[1Ea02] Nanometer Scale Atomic Layer Deposited Yttria-doped Ceria Shell on Pt for Oxygen Reduction Electrode

*Jeong Woo Shin¹, Sungje Lee², Dohyun Go³, Byung Chan Yang⁴, Taeyoung Kim⁵, Sung Eun Jo⁵, Pei-Chen Su¹, Jihwan An⁵ (1. School of Mechanical and Aerospace Engineering, Nanyang Technological University, 2. Department of Manufacturing System and Design Engineering, Seoul National University of Science and Technology, 3. Department of Nano-Bio Engineering, Seoul National University of Science and Technology, 4. Research Institute of Energy and Environment, Seoul National University of Science and Technology, 5. Department of Mechanical Engineering, Pohang University of Science and Technology)

Designing highly active and thermally stable electrodes is crucial for realizing low-temperature solid oxide fuel cells (LT-SOFCs) with excellent performance. In this study, we fabricated an yttria-doped ceria (YDC) shell layer by atomic layer deposition (ALD) over a Pt cathode by controlling the doping concentration of yttria in YDC film. The exchange current density was enhanced by a factor of five when the ALD YDC shell layer was deposited onto the cathode surface compared to the bare Pt cathode, resulting in an 80% decrease in the activation resistance of the 19 mol%-doped ALD YDC-overcoated Pt cathode compared to that of the bare Pt cathode. Furthermore, the thermal stability was enhanced in low-to-medium-doped (7–19 mol%) ALD YDC-coated Pt cathodes, whereas the highly doped (31 mol%) cathode showed a relatively marginal improvement in stability.