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      An excellent OER electrocatalyst of cubic SrCoO 3−δ prepared by a simple F-doping strategy

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          Abstract

          Cubic perovskite SrCoO 3−δ was successfully prepared through simple anion F-doping and demonstrated great OER performance.

          Abstract

          Driven by the increasing global energy demand, the development of innovative energy conversion and storage systems is becoming more and more urgent. As one of the attractive means, water splitting has attracted widespread attention because of its great potential in storing electricity in the form of chemical fuel which also makes it a promising solution to the utilization of non-grid electricity generated by solar or wind. The oxygen evolution reaction (OER) is generally deemed as the key rate-limiting step of water splitting, and thus studying efficient OER electrocatalysts with a low overpotential and good stability is of vital importance. Here, we successfully prepared an OER catalyst with excellent electrochemical performance through a simple anion doping. Firstly, a stable cubic perovskite SrCoO 3−δ was prepared by anion F-doping instead of traditional A and/or B site doping. Secondly, SrCoO 2.85−δF 0.15 demonstrates excellent OER activity superior to its parent hexagonal compound H-Sr 2Co 2O 5 and those perovskites prepared via complicated A- and/or B-site doping. DFT calculations and XPS investigations reveal that the cubic structure and the highly oxidative oxygen species (O 2 2−/O ) via F doping jointly contribute to the better OER properties of SrCoO 2.85−δF 0.15. Our work brings forth a promising strategy to stabilize cubic structures from hexagonal ones via a simple anion doping strategy, which may open a new avenue for the development of even more effective OER catalysts and may be applied in many other fields related to structure transformation, in addition to energy and catalysis fields.

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                Author and article information

                Contributors
                Journal
                JMCAET
                Journal of Materials Chemistry A
                J. Mater. Chem. A
                Royal Society of Chemistry (RSC)
                2050-7488
                2050-7496
                May 21 2019
                2019
                : 7
                : 20
                : 12538-12546
                Affiliations
                [1 ]CAS Key Laboratory of Materials for Energy Conversion
                [2 ]Department of Materials Science and Engineering
                [3 ]University of Science and Technology of China
                [4 ]Hefei
                [5 ]China
                [6 ]Department of Materials Science and Chemical Engineering
                [7 ]State University of New York at Stony Brook
                [8 ]New York 11794
                [9 ]USA
                Article
                10.1039/C9TA03099A
                e96e2967-866a-4384-ac32-0a698019caf3
                © 2019

                http://rsc.li/journals-terms-of-use

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