Journal
ADVANCED ENERGY MATERIALS
Volume 11, Issue 36, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202101899
Keywords
air electrodes; bifunctional; nanocomposites; perovskites; reversible protonic ceramic cells
Categories
Funding
- Research Grant Council of Hong Kong [16201820, 16206019]
- Nano & Material Technology Development Project [NRF-2021M3H4A1A01002919]
- Grobal Ph.D Fellowship through the National Research Foundation (NRF) of Korea - Ministry of Science, ICT, and Future Planning [2018H1A2A1060644]
- Hong Kong PhD Fellowship Scheme
- National Research Foundation of Korea [2018H1A2A1060644] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A novel nanocomposites concept for developing bifunctional RePCC electrodes with exceptional performance is reported in this work, optimizing reaction activity in both fuel cell/electrolysis operations. Experimental and computational studies confirm that the composite electrode ensures fast triple-conduction, achieving excellent electrolysis current and reaction activities.
Reversible protonic ceramic cells (RePCCs) can facilitate the global transition to renewable energy sources by providing high efficiency, scalable, and fuel-flexible energy generation and storage at the grid level. However, RePCC technology is limited by the lack of durable air electrode materials with high activity toward the oxygen reduction/evolution reaction and water formation/water-splitting reaction. Herein, a novel nanocomposites concept for developing bifunctional RePCC electrodes with exceptional performance is reported. By harnessing the unique functionalities of nanoscale particles, nanocomposites can produce electrodes that simultaneously optimize reaction activity in both fuel cell/electrolysis operations. In this work, a nanocomposite electrode composed of tetragonal and Ruddlesden-Popper (RP) perovskite phases with a surface enriched by CeO2 and NiO nanoparticles is synthesized. Experiments and calculations identify that the RP phase promotes hydration and proton transfer, while NiO and CeO2 nanoparticles facilitate O-2 surface exchange and O2- transfer from the surface to the major perovskite. This composite also ensures fast (H+/O2-/e(-)) triple-conduction, thereby promoting oxygen reduction/evolution reaction activities. The as-fabricated RePCC achieves an excellent peak power density of 531 mW cm(-2) and an electrolysis current of -364 mA cm(-2) at 1.3 V at 600 degrees C, while demonstrating exceptional reversible operation stability of 120 h at 550 degrees C.
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