A niobium and tantalum co-doped perovskite cathode for solid oxide fuel cells operating below 500 °c

Mengran Li; Mingwen Zhao; Feng Li; Wei Zhou; Vanessa K. Peterson; Xiaoyong Xu; Zongping Shao; Ian Gentle; Zhonghua Zhu

doi:10.1038/ncomms13990

A niobium and tantalum co-doped perovskite cathode for solid oxide fuel cells operating below 500 °c

Mengran Li, Mingwen Zhao, Feng Li, Wei Zhou, Vanessa K. Peterson, Xiaoyong Xu, Zongping Shao, Ian Gentle, Zhonghua Zhu

College of Chemical Engineering

Research output: Contribution to journal › Article › peer-review

269 Scopus citations

Abstract

The slow activity of cathode materials is one of the most significant barriers to realizing the operation of solid oxide fuel cells below 500 °C. Here we report a niobium and tantalum co-substituted perovskite SrCo_0.8Nb_0.1Ta_0.1O_3-δ as a cathode, which exhibits high electroactivity. This cathode has an area-specific polarization resistance as low as ~0.16 and ~0.68 Ωcm² in a symmetrical cell and peak power densities of 1.2 and 0.7 W cm^-2 in a Gd_0.1Ce_0.9O_1.95-based anode-supported fuel cell at 500 and 450 °C, respectively. The high performance is attributed to an optimal balance of oxygen vacancies, ionic mobility and surface electron transfer as promoted by the synergistic effects of the niobium and tantalum. This work also points to an effective strategy in the design of cathodes for low-temperature solid oxide fuel cells.

Original language	English
Article number	13990
Journal	Nature Communications
Volume	8
DOIs	https://doi.org/10.1038/ncomms13990
State	Published - 3 Jan 2017

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title = "A niobium and tantalum co-doped perovskite cathode for solid oxide fuel cells operating below 500 °c",

abstract = "The slow activity of cathode materials is one of the most significant barriers to realizing the operation of solid oxide fuel cells below 500 °C. Here we report a niobium and tantalum co-substituted perovskite SrCo0.8Nb0.1Ta0.1O3-δ as a cathode, which exhibits high electroactivity. This cathode has an area-specific polarization resistance as low as ~0.16 and ~0.68 Ωcm2 in a symmetrical cell and peak power densities of 1.2 and 0.7 W cm-2 in a Gd0.1Ce0.9O1.95-based anode-supported fuel cell at 500 and 450 °C, respectively. The high performance is attributed to an optimal balance of oxygen vacancies, ionic mobility and surface electron transfer as promoted by the synergistic effects of the niobium and tantalum. This work also points to an effective strategy in the design of cathodes for low-temperature solid oxide fuel cells.",

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AU - Li, Mengran

AU - Zhao, Mingwen

AU - Li, Feng

AU - Zhou, Wei

AU - Peterson, Vanessa K.

AU - Xu, Xiaoyong

AU - Shao, Zongping

AU - Gentle, Ian

AU - Zhu, Zhonghua

PY - 2017/1/3

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AB - The slow activity of cathode materials is one of the most significant barriers to realizing the operation of solid oxide fuel cells below 500 °C. Here we report a niobium and tantalum co-substituted perovskite SrCo0.8Nb0.1Ta0.1O3-δ as a cathode, which exhibits high electroactivity. This cathode has an area-specific polarization resistance as low as ~0.16 and ~0.68 Ωcm2 in a symmetrical cell and peak power densities of 1.2 and 0.7 W cm-2 in a Gd0.1Ce0.9O1.95-based anode-supported fuel cell at 500 and 450 °C, respectively. The high performance is attributed to an optimal balance of oxygen vacancies, ionic mobility and surface electron transfer as promoted by the synergistic effects of the niobium and tantalum. This work also points to an effective strategy in the design of cathodes for low-temperature solid oxide fuel cells.

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A niobium and tantalum co-doped perovskite cathode for solid oxide fuel cells operating below 500 °c

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