Issue 19, 2022

BaTb0.3Fe0.7O3−δ: a new proton-conductor-derived cathode for proton-conducting solid oxide fuel cells

Abstract

BaTbO3 is a much less focused proton-conductor than the traditional BaCeO3–BaZrO3 system due to its lower proton conductivity. However, the present study reveals that using BaTbO3 as the parent material to form the new BaTb0.3Fe0.7O3−δ (BTF) can boost the cathode performance for proton-conducting solid oxide fuel cells (H–SOFCs). Compared with the traditional Fe-doped BaZrO3 (BZF), the electronic structure of BTF is regulated due to the presence of Tb3+ and Tb4+, leading to more abundant oxygen vacancies and improved oxygen reduction reaction activities compared with BZF, which have been demonstrated by both experiments and first-principles calculations. The slightly decreased proton diffusion by using BaTbO3 compared with BaZrO3 is compensated by the greatly enhanced oxygen diffusion and surface exchange abilities, leading to a record-high performance for the BTF cathode compared with other proton conductor-derived cathodes for H–SOFCs.

Graphical abstract: BaTb0.3Fe0.7O3−δ: a new proton-conductor-derived cathode for proton-conducting solid oxide fuel cells

Supplementary files

Article information

Article type
Communication
Submitted
21 Jun 2022
Accepted
28 Jul 2022
First published
28 Jul 2022

Sustainable Energy Fuels, 2022,6, 4375-4382

BaTb0.3Fe0.7O3−δ: a new proton-conductor-derived cathode for proton-conducting solid oxide fuel cells

L. Zhang, G. Dai, S. Yu, C. Ma, H. Dai and L. Bi, Sustainable Energy Fuels, 2022, 6, 4375 DOI: 10.1039/D2SE00849A

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