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Proton Conductivity in Mixed B-Site Doped Perovskite Oxide BaZr[sub 0.5]In[sub 0.25]Yb[sub 0.25]O[sub 3 - delta]

Istaq Ahmed (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Francis G. Kinyanjui (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Seikh Rahman (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Patrick Steegstra ; Sten G. Eriksson (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Elisabet Ahlberg
Journal of The Electrochemical Society (0013-4651). Vol. 157 (2010), 12, p. B1819-B1824.
[Artikel, refereegranskad vetenskaplig]

A wet chemical route was used to prepare the oxygen deficient codoped perovskite oxide BaZr0.5In0.25Yb0.25O3−. Analysis of X-ray powder diffraction data showed that the sample belongs to the cubic crystal system with space group Pmm. Dynamic thermogravimetric (TG) analysis confirmed complete filling of oxygen vacancies (V) by protonic defects (OH) during the hydration process. The proton conductivity was investigated by impedance spectroscopy. The bulk and total conductivities of prehydrated BaZr0.5In0.25Yb0.25O3− were found to be 8.5×10−4 and 2.2×10−5 S cm−1, respectively, at 300°C. The total conductivity in the codoped perovskite oxide was higher compared to that of the respective single doped perovskite oxides with the same doping level. The bulk and grain-boundary mobility and diffusion coefficients of protons were calculated at 200°C using impedance and TG data to obtain the conductivity and proton concentration, respectively. The high bulk diffusivity (2.3×10−7 cm2 s−1) was obtained which indicates that the protons are more free to move in the heavily doped matrix compared to the lightly doped systems where trapping of protons occurs.

Nyckelord: barium compounds, proton exchange membrane fuel cells, thermal analysis, vacancies (crystal), X-ray diffraction, zirconium compounds

Denna post skapades 2010-11-30. Senast ändrad 2010-12-08.
CPL Pubid: 129872


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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Oorganisk miljökemi (2005-2014)
Institutionen för kemi (2001-2011)


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Chalmers infrastruktur

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