induced scission measurements, imaging with AFM and TEM, and analysis of data. A.J.L. performed FRET measurements and analysis of the data. X.Z., T.C.-T., and Y.C. performed solution X-ray scattering, and analysis of the data. A.J.L. and Y.C. conceptualized nanoribbon thread processing and Y.C. and M.G. prepared nanoribbon threads. M.G. performed tensile testing of nanoribbon threads and analysis of the data. T.C.-T. and Y.C. performed X-ray scattering of solid-state nanoribbon threads and analysis of the data. J.
The self-assembly of amphiphilic small molecules in water leads to nanostructures with customizable structure-property relationships arising from their tunable chemistries. Characterization of these assemblies is generally limited to their static...
Surface oxygen reduction
reaction (ORR) rates at n-type oxide-based
mixed ionic–electronic conducting (MIEC) solid oxide fuel cell
(SOFC) cathodes can be expected to be enhanced relative to that at
p-type MIEC cathodes due to the greater availability of electrons
at higher energies in the band structure needed for the charge transfer
reaction. However, given the difficulty of achieving coexisting oxygen
vacancies and electrons in the conduction band under oxidizing cathode
conditions, no stable n-type MIEC cathodes have been reported to date.
In this study, a predominantly n-type MIEC conductivity is confirmed
in a Ba–In-based oxide (BNIM) co-doped with Nd and Mn at high
temperature and high P
O2
confirmed
by the P
O2
dependence of the
electrical conductivity and negative Seebeck coefficients, combined
with readily measurable oxide ion transference numbers. This coexistence
of n-type electronic and oxide ion conductivities is discussed based
on the electrical behavior of BNIM with different Mn levels and is
attributed to the significant change in the degree of anion Frenkel
ordering and the band structure associated with heavy donor doping
of Ba2In2O5. This novel n-type MIEC
has the potential for enhancing the ORR at SOFC cathodes at reduced
temperatures and thereby identifying new potential candidate cathode
materials for next-generation SOFCs.
Strongly interacting amphiphilic molecules self-assemble in water. The flexibility of the amphiphiles and their head group repulsion mediate their nanostructure geometry.
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