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Issue 40, 2017
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Fabrication of a mesoporous Ba0.5Sr0.5Co0.8Fe0.2O3−δ perovskite as a low-cost and efficient catalyst for oxygen reduction

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Abstract

A precious metal-free cathode catalyst, mesoporous Ba0.5Sr0.5Co0.8Fe0.2O3−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.

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

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Publication details

The article was received on 19 Aug 2017, accepted on 18 Sep 2017 and first published on 18 Sep 2017


Article type: Paper
DOI: 10.1039/C7DT03082G
Citation: Dalton Trans., 2017,46, 13903-13911
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    Fabrication of a mesoporous Ba0.5Sr0.5Co0.8Fe0.2O3−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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