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Oral presentation

Derivation of standard potential of Se(IV)/Se(VI) redox system by cyclic voltametry

Doi, Reisuke; Fujiwara, Kenso

no journal, , 

The standard potential of Se(IV)/Se(VI) couple has been obtained by cyclic voltametry in the relatively pure system. The formal potentials of the selenium redox reaction have been determined in NaClO$$_{4}$$ medium of various ionic strength (I(mol/kg)=0.500, 1.00, 1.50, 2.00) at room temperature. These data have been interpreted by using the Specific Ion Interaction Theory to give the following standard potential. In addition, the reactive chemical species have been identified by the dependence of peak potential of oxidation wave on Se concentration. As a result, the following standard potential was determined:HSeO$$_{3}$$$$^{-}$$+H$$_{2}$$O=SeO$$_{4}$$$$^{2-}$$+3H$$^{+}$$+2e$$^{-}$$ E$$^{0}$$=0.821$$pm$$0.002V vs. SHE This standard potential is consistent with the other experimental study which confirmed the existence of Se(VI) in the potential region which is inconsistent with the selected value by OECD/NEA.

Oral presentation

Effect of annealing on crystal structure of SOFC electrolyte materials by in-situ neutron diffraction

Ito, Takanori*; Hirai, Takene*; Wang, Z.*; Mori, Masashi*; Igawa, Naoki

no journal, , 

We investigate the effect of annealing on the crystal structure of the solid oxide fuel cell electrolyte by neutron diffraction study with the Rietveld/maximum entropy method analyses. We observed the high nuclear scattering length density distribution of oxygen on the (400) plane of as sintered scandium and cerium oxide doped zirconia measured at 700 K. It was founded that those spread region became lower by the annealing at 600$$^{circ}$$C for 1000h.

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