An Effective Strategy to Enhance the Electrocatalytic Activity of Ruddlesden−Popper Oxides Sr3Fe2O7−δ Electrodes for Solid Oxide Fuel Cells

The target of this work is to develop advanced electrode materials with excellent performance compared to conventional cathodes. Cobalt-free Ruddlesden−Popper oxides Sr3Fe2−xCuxO7−&l...

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Autores principales:	Longsheng Peng, Qiang Li, Liping Sun, Hui Zhao
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	solid oxide fuel cells cathode material Ruddlesden−Popper oxides electrochemical performance Chemical technology TP1-1185 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/834d5a391959421f9c01bb5997696c35
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spelling	oai:doaj.org-article:834d5a391959421f9c01bb5997696c352021-11-25T17:06:48ZAn Effective Strategy to Enhance the Electrocatalytic Activity of Ruddlesden−Popper Oxides Sr<sub>3</sub>Fe<sub>2</sub>O<sub>7−</sub><i><sub>δ</sub></i> Electrodes for Solid Oxide Fuel Cells10.3390/catal111114002073-4344https://doaj.org/article/834d5a391959421f9c01bb5997696c352021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4344/11/11/1400https://doaj.org/toc/2073-4344The target of this work is to develop advanced electrode materials with excellent performance compared to conventional cathodes. Cobalt-free Ruddlesden−Popper oxides Sr<sub>3</sub>Fe<sub>2−<i>x</i></sub>Cu<i><sub>x</sub></i>O<sub>7−</sub><i><sub>δ</sub></i> (SFC<i>x</i>, <i>x</i> = 0, 0.1, 0.2) were successfully synthesized and assessed as cathode materials for solid oxide fuel cells (SOFCs). Herein, a Cu-doping strategy is shown to increase the electrical conductivity and improve the electrochemical performance of the pristine Sr<sub>3</sub>Fe<sub>2</sub>O<sub>7−</sub><i><sub>δ</sub></i>. Among all the cathode materials, the Sr<sub>3</sub>Fe<sub>1.9</sub>Cu<sub>0.1</sub>O<sub>7−</sub><i><sub>δ</sub></i> (SFC10) cathode exhibits the best electrocatalytic activity for oxygen reduction reaction (ORR). The polarization resistance is 0.11 Ω cm<sup>2</sup> and the peak power density of the single-cell with an SFC10 cathode reaches 955 mW cm<sup>−2</sup> at 700 °C, a measurement comparable to cobalt-based electrodes. The excellent performance is owed to favorable oxygen surface exchange capabilities and larger oxygen vacancy concentrations at elevated temperatures. Moreover, the electrochemical impedance spectra and distribution of relaxation time results indicate that the charge transfer process at the triple-phase boundary is the rate-limiting step for ORR on the electrode. This work provides an effective strategy for designing novel cathode electrocatalysts for SOFCs.Longsheng PengQiang LiLiping SunHui ZhaoMDPI AGarticlesolid oxide fuel cellscathode materialRuddlesden−Popper oxideselectrochemical performanceChemical technologyTP1-1185ChemistryQD1-999ENCatalysts, Vol 11, Iss 1400, p 1400 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	solid oxide fuel cells cathode material Ruddlesden−Popper oxides electrochemical performance Chemical technology TP1-1185 Chemistry QD1-999
spellingShingle	solid oxide fuel cells cathode material Ruddlesden−Popper oxides electrochemical performance Chemical technology TP1-1185 Chemistry QD1-999 Longsheng Peng Qiang Li Liping Sun Hui Zhao An Effective Strategy to Enhance the Electrocatalytic Activity of Ruddlesden−Popper Oxides Sr<sub>3</sub>Fe<sub>2</sub>O<sub>7−</sub><i><sub>δ</sub></i> Electrodes for Solid Oxide Fuel Cells
description	The target of this work is to develop advanced electrode materials with excellent performance compared to conventional cathodes. Cobalt-free Ruddlesden−Popper oxides Sr<sub>3</sub>Fe<sub>2−<i>x</i></sub>Cu<i><sub>x</sub></i>O<sub>7−</sub><i><sub>δ</sub></i> (SFC<i>x</i>, <i>x</i> = 0, 0.1, 0.2) were successfully synthesized and assessed as cathode materials for solid oxide fuel cells (SOFCs). Herein, a Cu-doping strategy is shown to increase the electrical conductivity and improve the electrochemical performance of the pristine Sr<sub>3</sub>Fe<sub>2</sub>O<sub>7−</sub><i><sub>δ</sub></i>. Among all the cathode materials, the Sr<sub>3</sub>Fe<sub>1.9</sub>Cu<sub>0.1</sub>O<sub>7−</sub><i><sub>δ</sub></i> (SFC10) cathode exhibits the best electrocatalytic activity for oxygen reduction reaction (ORR). The polarization resistance is 0.11 Ω cm<sup>2</sup> and the peak power density of the single-cell with an SFC10 cathode reaches 955 mW cm<sup>−2</sup> at 700 °C, a measurement comparable to cobalt-based electrodes. The excellent performance is owed to favorable oxygen surface exchange capabilities and larger oxygen vacancy concentrations at elevated temperatures. Moreover, the electrochemical impedance spectra and distribution of relaxation time results indicate that the charge transfer process at the triple-phase boundary is the rate-limiting step for ORR on the electrode. This work provides an effective strategy for designing novel cathode electrocatalysts for SOFCs.
format	article
author	Longsheng Peng Qiang Li Liping Sun Hui Zhao
author_facet	Longsheng Peng Qiang Li Liping Sun Hui Zhao
author_sort	Longsheng Peng
title	An Effective Strategy to Enhance the Electrocatalytic Activity of Ruddlesden−Popper Oxides Sr<sub>3</sub>Fe<sub>2</sub>O<sub>7−</sub><i><sub>δ</sub></i> Electrodes for Solid Oxide Fuel Cells
title_short	An Effective Strategy to Enhance the Electrocatalytic Activity of Ruddlesden−Popper Oxides Sr<sub>3</sub>Fe<sub>2</sub>O<sub>7−</sub><i><sub>δ</sub></i> Electrodes for Solid Oxide Fuel Cells
title_full	An Effective Strategy to Enhance the Electrocatalytic Activity of Ruddlesden−Popper Oxides Sr<sub>3</sub>Fe<sub>2</sub>O<sub>7−</sub><i><sub>δ</sub></i> Electrodes for Solid Oxide Fuel Cells
title_fullStr	An Effective Strategy to Enhance the Electrocatalytic Activity of Ruddlesden−Popper Oxides Sr<sub>3</sub>Fe<sub>2</sub>O<sub>7−</sub><i><sub>δ</sub></i> Electrodes for Solid Oxide Fuel Cells
title_full_unstemmed	An Effective Strategy to Enhance the Electrocatalytic Activity of Ruddlesden−Popper Oxides Sr<sub>3</sub>Fe<sub>2</sub>O<sub>7−</sub><i><sub>δ</sub></i> Electrodes for Solid Oxide Fuel Cells
title_sort	effective strategy to enhance the electrocatalytic activity of ruddlesden−popper oxides sr<sub>3</sub>fe<sub>2</sub>o<sub>7−</sub><i><sub>δ</sub></i> electrodes for solid oxide fuel cells
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/834d5a391959421f9c01bb5997696c35
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An Effective Strategy to Enhance the Electrocatalytic Activity of Ruddlesden−Popper Oxides Sr<sub>3</sub>Fe<sub>2</sub>O<sub>7−</sub><i><sub>δ</sub></i> Electrodes for Solid Oxide Fuel Cells

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