TY - JOUR
T1 - Correlation between the Charge-Transport Properties and the 3D-Phase Connectivities in Patterned Pt/CeO2 Nanostructured Composites
T2 - Implications for Solid-Oxide Fuel Cells
AU - Wen, Yu
AU - Abe, Hideki
AU - Hirata, Akihiko
AU - Hashimoto, Ayako
N1 - Funding Information:
The authors thank the TEM station of the National Institute for Materials Science (NIMS) for their support during the TEM characterization. This work was funded by the Precursory Research for Embryonic Science and Technology (PREST) (Grant No. JPMJPR17S7) and the Core Research for Evolutional Science and Technology (CREST) (Grant No. JPMJCR15P1), Japan.
Publisher Copyright:
© 2021 American Chemical Society
PY - 2021/12/24
Y1 - 2021/12/24
N2 - Homology analysis revealed a hidden correlation between the charge-transport properties and the three-dimensional (3D) phase connectivities of metal/oxide nanocomposites. A group of Pt/CeO2 nanostructured composites with different nanotextures ranging from fibrous networks to lamellae were synthesized and identified by electron tomography. The pre-exponential factor of the ionic conductivity of each nanocomposite showed a linear correlation with one of the homological invariants corresponding to the three-dimensional (3D) connectivity of the ion-conductive CeO2 phase, i.e., 3D-β0. The other descriptor for ionic transport, namely, the activation energy, could not be rationally attributed to any of the Betti numbers but mainly correlated with the local crystallinity at the Pt/CeO2 interface. These findings are helpful in the design of electrolytes or electrodes with high oxygen ionic conductivities for application in solid-oxide fuel cells. Moreover, the homological approach proposed in this work can be extended to different nanocomposites, opening up an unexplored pathway for the rational design of nanocomposites based on the homological linkages between their 3D nanotextures and their resulting functionalities.
AB - Homology analysis revealed a hidden correlation between the charge-transport properties and the three-dimensional (3D) phase connectivities of metal/oxide nanocomposites. A group of Pt/CeO2 nanostructured composites with different nanotextures ranging from fibrous networks to lamellae were synthesized and identified by electron tomography. The pre-exponential factor of the ionic conductivity of each nanocomposite showed a linear correlation with one of the homological invariants corresponding to the three-dimensional (3D) connectivity of the ion-conductive CeO2 phase, i.e., 3D-β0. The other descriptor for ionic transport, namely, the activation energy, could not be rationally attributed to any of the Betti numbers but mainly correlated with the local crystallinity at the Pt/CeO2 interface. These findings are helpful in the design of electrolytes or electrodes with high oxygen ionic conductivities for application in solid-oxide fuel cells. Moreover, the homological approach proposed in this work can be extended to different nanocomposites, opening up an unexplored pathway for the rational design of nanocomposites based on the homological linkages between their 3D nanotextures and their resulting functionalities.
KW - 3D tomography
KW - homology
KW - metal/oxide nanocomposites
KW - oxygen ion conductivity
KW - phase connectivity
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U2 - 10.1021/acsanm.1c03036
DO - 10.1021/acsanm.1c03036
M3 - Article
AN - SCOPUS:85121979225
SN - 2574-0970
VL - 4
SP - 13602
EP - 13611
JO - ACS Applied Nano Materials
JF - ACS Applied Nano Materials
IS - 12
ER -