Cation Swapping for High Power Density of SOFC
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- Cation Swapping for High Power Density of SOFC
- Other Titles
- SOFC 고전력밀도를위한양이온교환전략
- 주상욱; 권오훈; 임채현; 김건태
- Issue Date
- 2019 한국세라믹학회 추계학술대회
- Exsolution has been intensively studied in the fields of energy conversion and storage as a method for the preparation of catalytically active and durable metal nanoparticles. Under typical conditions, however, only a limited number of nanoparticles can be exsolved from the host oxides. Herein, we report the first preparation of catalytic nanoparticles by selective exsolution through “topotactic ion exchange”, where deposited Fe guest cations can be exchanged with Co host cations in PrBaMn1.7Co0.3O5+. Interestingly, this phenomenon spontaneously yields the new host PrBaMn1.7Fe0.3O5+, liberating all the Co cations from the host owing to the favorable incorporation energy of Fe into the lattice of the parent host (∆Eincorporation= −0.41 eV) and the cation exchange energy (∆Eexchange= −0.34 eV). Remarkably, the increase in the number of exsolved nanoparticles leads to their
improved catalytic activity as a SOFC electrode and in the dry reforming of methane.
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