Fabrication of a mesoporous Ba0.5Sr0.5Co0.8Fe0.2O3−δ perovskite as a low-cost and efficient catalyst for oxygen reduction

Xiangzhi Cui; Ryan O'Hayre; Svitlana Pylypenko; Linlin Zhang; Liming Zeng; Xiaohua Zhang; Zile Hua; Hangrong Chen; Jianlin Shi

doi:10.1039/C7DT03082G

Fabrication of a mesoporous Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3−δ perovskite as a low-cost and efficient catalyst for oxygen reduction†

Xiangzhi Cui,^a Ryan O'Hayre,^b Svitlana Pylypenko,^b Linlin Zhang,^a Liming Zeng,^a Xiaohua Zhang,^a Zile Hua,

^a Hangrong Chen

^a and Jianlin Shi

*^a

Author affiliations

* Corresponding authors

^a State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China
E-mail: jlshi@mail.sic.ac.cn
Fax: +86-21-52413122
Tel: +86-21-52412712

^b Department of Metallurgical & Materials Engineering, Colorado School of Mines, 1500 Illinois Street, Golden, Colorado 80401, USA

Abstract

A precious metal-free cathode catalyst, mesoporous Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3−δ (m-BSCF), with a well crystallized perovskite framework and a porous structure (pore size of ∼10 nm) has been synthesized by a one-step co-nanocasting method. The obtained mesoporous perovskite m-BSCF demonstrated a much higher oxygen reduction reaction catalytic activity than its macroporous (CS-BSCF of ∼5 μm pore size) and nonporous counterparts (SG-BSCF). The mesoporous structure and oxygen vacancies Image ID:c7dt03082g-t1.gif endowed the obtained perovskite oxide m-BSCF with an approximate 4e⁻ pathway for the ORR comparable to the benchmark 20 wt% Pt/C and a stable electro-catalytic activity with 91% current density being retained after 5000 cycles, and excellent methanol tolerance. The redox couples Co⁴⁺/Co³⁺ and Fe³⁺/Fe²⁺ are proposed to accelerate the ORR on active species, i.e., MOOH (M = Co, Fe) groups produced by the substitution species of Co and Fe in the B-site of perovskite m-BSCF, and in the meantime oxygen vacancies Image ID:c7dt03082g-t2.gif generated by the redox couples play a key role in activating the oxygen molecules.

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Article information

DOI: https://doi.org/10.1039/C7DT03082G
Article type: Paper
Submitted: 19 Aug 2017
Accepted: 18 Sep 2017
First published: 18 Sep 2017

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Dalton Trans., 2017,46, 13903-13911

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Fabrication of a mesoporous Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3−δ perovskite as a low-cost and efficient catalyst for oxygen reduction

X. Cui, R. O'Hayre, S. Pylypenko, L. Zhang, L. Zeng, X. Zhang, Z. Hua, H. Chen and J. Shi, Dalton Trans., 2017, 46, 13903 DOI: 10.1039/C7DT03082G

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