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      Direct transformation of bulk copper into copper single sites via emitting and trapping of atoms

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          Co3O4 nanocrystals on graphene as a synergistic catalyst for oxygen reduction reaction

          Catalysts for oxygen reduction and evolution reactions are at the heart of key renewable-energy technologies including fuel cells and water splitting. Despite tremendous efforts, developing oxygen electrode catalysts with high activity at low cost remains a great challenge. Here, we report a hybrid material consisting of Co₃O₄ nanocrystals grown on reduced graphene oxide as a high-performance bi-functional catalyst for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Although Co₃O₄ or graphene oxide alone has little catalytic activity, their hybrid exhibits an unexpected, surprisingly high ORR activity that is further enhanced by nitrogen doping of graphene. The Co₃O₄/N-doped graphene hybrid exhibits similar catalytic activity but superior stability to Pt in alkaline solutions. The same hybrid is also highly active for OER, making it a high-performance non-precious metal-based bi-catalyst for both ORR and OER. The unusual catalytic activity arises from synergetic chemical coupling effects between Co₃O₄ and graphene.
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            Thermally stable single-atom platinum-on-ceria catalysts via atom trapping

            Catalysts based on single atoms of scarce precious metals can lead to more efficient use through enhanced reactivity and selectivity. However, single atoms on catalyst supports can be mobile and aggregate into nanoparticles when heated at elevated temperatures. High temperatures are detrimental to catalyst performance unless these mobile atoms can be trapped. We used ceria powders having similar surface areas but different exposed surface facets. When mixed with a platinum/aluminum oxide catalyst and aged in air at 800°C, the platinum transferred to the ceria and was trapped. Polyhedral ceria and nanorods were more effective than ceria cubes at anchoring the platinum. Performing synthesis at high temperatures ensures that only the most stable binding sites are occupied, yielding a sinter-resistant, atomically dispersed catalyst.
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              Direct atomic-level insight into the active sites of a high-performance PGM-free ORR catalyst

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                Author and article information

                Journal
                Nature Catalysis
                Nat Catal
                Springer Nature
                2520-1158
                October 2018
                October 8 2018
                October 2018
                : 1
                : 10
                : 781-786
                Article
                10.1038/s41929-018-0146-x
                daa6e9b4-1954-4f4e-901d-b8c8da63aacd
                © 2018

                http://www.springer.com/tdm

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