丹所 正孝 　 Masataka Tansho

Research Overview

Analyses using solid-state NMR were carried out to investigate the structures near the conduction layers in fuel cell materials (oxide ion and proton conductors). Many fuel cell materials, such as yttria-stabilized zirconia (YSZ) containing yttrium (Y) and zirconium (Zr), exhibit their performance due to combinations of elements that are adjacent to each other in the periodic table. In Ba-M (M = Mo, Nb)-O, which has recently attracted considerable attention, it is important in structural analysis to distinguish between Mo (molybdenum) and Nb (niobium), which are adjacent in the periodic table, and 800 MHz solid-state NMR is used for this purpose.
Even when hydrogen or excess oxygen is added, for the M (Mo/Nb)O₄ tetrahedra near the conduction layer, the MoO₄ tetrahedral signal (left side) remains large whereas the NbO₄ tetrahedral signal (right side) decreases significantly. Therefore, it has been clarified that the effects of hydrogen or excess oxygen addition are greater for Nb than for Mo.

Masataka Tansho et al.,
Solid-State 95Mo and 93Nb NMR Study of Ba7Nb4MoO20-Based Materials and Ba7Ta3.7Mo1.3O20.15
The Journal of Physcal Chemistry C. 128 [46] (2024) 19679–19687
10.1021/acs.jpcc.4c02645

Keywords

Physical Chemistry, Inorganic Chemistry, Solid-State NMR, Structural Analysis, Fuel Cells, 800 MHz

• Members