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A Highly Active and Redox-Stable SrGdNi0.2Mn0.8O4±δ Anode with in Situ Exsolution of Nanocatalysts
- A Highly Active and Redox-Stable SrGdNi0.2Mn0.8O4±δ Anode with in Situ Exsolution of Nanocatalysts
- Kim, Kyeong Joon; Rath, Manasa Kumar; Kwak, Hun Ho; Kim, Hyung Jun; Han, Jeong Woo; Hong, Seung-Tae; Lee, Kang-Taek
- DGIST Authors
- Hong, Seung-Tae; Lee, Kang-Taek
- Issue Date
- ACS Catalysis, 9(2), 1172-1182
- Article Type
- Author Keyword
- solid oxide fuel cells; layered perovskite; ceramic anode; exsolution; redox stable
- SOLID-OXIDE FUEL; LAYERED PEROVSKITE ANODE; HYDROGEN OXIDATION; CATHODE MATERIAL; NANOPARTICLES; TEMPERATURE; PERFORMANCE; METHANE; ALLOY; NI
- Layered perovskite SrGdNixMn1-xO4±δ phases were evaluated as new ceramic anode materials for use in solid oxide fuel cells (SOFCs). Hydrogen temperature-programmed reduction (H2-TPR) analysis of the SrGdNixMn1-xO4±δ (x = 0.2, 0.5, and 0.8) materials revealed that significant exsolution of Ni nanoparticles occurred in SrGdNi0.2Mn0.8O4±δ (SGNM28) in H2 at over 650 °C. Consistently, the SGNM28 on the LSGM electrolyte showed low electrode polarization resistance (1.79 ω cm2) in H2 at 800 °C. Moreover, after 10 redox cycles at 750 °C, the electrode area specific resistance of the SGNM28 anode in H2 increased only 0.027 ω·cm2 per cycle (1.78% degradation rate), indicating excellent redox stability in both reducing and oxidizing atmospheres. An LSGM-electrolyte-supported SOFC employing an SGNM28-Gd-doped ceria anode yielded a maximum power density of 1.26 W cm-2 at 850 °C, which is the best performance among the SOFCs with Ruddlesden-Popper-based ceramic anodes to date. After performance measurement, we observed that metallic Ni nanoparticles (∼ 25 nm) were grown in situ and homogeneously distributed on the SGNM28 anode surface. These exsolved nanocatalysts are believed to significantly enhance the hydrogen oxidation activity of the SGNM28 material. These results demonstrate that the SGNM28 material is promising as a high catalytically active and redox-stable anode for SOFCs. © 2019 American Chemical Society.
- American Chemical Society
- Related Researcher
Discovery Lab(Batteries & Materials Discovery Laboratory)
Magnesium, sodium and lithium ion rechargeable batteries; New inorganic materials discovery; Solid state chemistry; Crystallography; Mg, Na, Li 이온 이차전지; 신 무기재료 합성; 고체화학; 결정화학
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- Department of Energy Science and EngineeringAECSL(Advanced Energy Conversion and Storage Lab)1. Journal Articles
Department of Energy Science and EngineeringAECSL(Advanced Energy Conversion and Storage Lab)1. Journal Articles
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