Oxygen Reduction Response of La and Ce Co-Doped SrCoO<sub>3−δ</sub> Perovskite Oxide Grown on Porous Ni-Foam Substrate
oleh: Jinping Wang, Naveed Mushtaq, M. A. K. Yousaf Shah, Jiaen Wu, Henghui Li, Yuzheng Lu, Peng Wang
| Format: | Article |
|---|---|
| Diterbitkan: | MDPI AG 2022-11-01 |
Deskripsi
Lately, ceramic fuel cells (CFCs) have held exceptional promise for joint small- and large-scale applications. However, the low-oxygen reduction response of cathode materials has hindered the low operating temperature of CFCs. Herein, we have developed a semiconductor based on La and Ce co-doped SrCoO<sub>3</sub> and embedded them in porous Ni-foam to study their electrochemical properties. The porous Ni-foam-pasted La<sub>0.2</sub>Sr<sub>0.8</sub>Co<sub>0.8</sub>Ce<sub>0.2</sub>O<sub>3‒δ</sub> cathode displays small-area-specific resistance and excellent ORR (oxygen reduction reaction) activity at low operating temperatures (LT) of 450–500 °C. The proposed device has delivered an impressive fuel cell performance of 440 mW-cm<sup>−2</sup>, using La<sub>0.2</sub>Sr<sub>0.8</sub>Co<sub>0.8</sub>Ce<sub>0.2</sub>O<sub>3−δ</sub> embedded on porous Ni-foam substrate cathode operation at 550 °C with H<sub>2</sub> fuel and atmospheric air. It even can function well at a lower temperature of 450 °C. Moreover, La<sub>0.2</sub>Sr<sub>0.8</sub>Co<sub>0.8</sub>Ce<sub>0.2</sub>O<sub>3−δ</sub> embedded on porous Ni-foam shows very good activation energy compared to individual SrCoO<sub>3</sub> and La<sub>0.1</sub>Sr<sub>0.9</sub>Co<sub>0.9</sub>Ce<sub>0.1</sub>O<sub>3−δ</sub> embedded on porous Ni-foam, which help to promote ORR activity. Different characterization has been deployed, likewise: X-ray diffraction, photoelectron-spectroscopy, and electrochemical impedance spectroscopy for a better understanding of improved ORR electrocatalytic activity of prepared La<sub>0.2</sub>Sr<sub>0.8</sub>Co<sub>0.8</sub>Ce<sub>0.2</sub>O<sub>3−δ</sub> embedded on porous Ni-foam substrate. These results can further help to develop functional cobalt-free electrocatalysts for LT-SOFCs.