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      PtPd hollow nanocubes with enhanced alloy effect and active facets for efficient methanol oxidation reaction

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          Abstract

          An alternating-reduction approach is developed to fabricate PtPd hollow nanocubes with highly catalytically-favoured {100} facets and enhanced alloy effect for efficient methanol oxidation reaction.

          Abstract

          We report an alternating-reduction approach by galvanic replacement and co-reduction to enable incorporation of Pd into Pt shell, and the obtained PtPd hollow nanocubes with an enhanced alloy effect and highly active {100} facets show high catalytic activity and superior durability in the methanol oxidation reaction.

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          Highly crystalline multimetallic nanoframes with three-dimensional electrocatalytic surfaces.

          Chen Chen, Yijin Kang, Ziyang Huo … (2014)
          Control of structure at the atomic level can precisely and effectively tune catalytic properties of materials, enabling enhancement in both activity and durability. We synthesized a highly active and durable class of electrocatalysts by exploiting the structural evolution of platinum-nickel (Pt-Ni) bimetallic nanocrystals. The starting material, crystalline PtNi3 polyhedra, transforms in solution by interior erosion into Pt3Ni nanoframes with surfaces that offer three-dimensional molecular accessibility. The edges of the Pt-rich PtNi3 polyhedra are maintained in the final Pt3Ni nanoframes. Both the interior and exterior catalytic surfaces of this open-framework structure are composed of the nanosegregated Pt-skin structure, which exhibits enhanced oxygen reduction reaction (ORR) activity. The Pt3Ni nanoframe catalysts achieved a factor of 36 enhancement in mass activity and a factor of 22 enhancement in specific activity, respectively, for this reaction (relative to state-of-the-art platinum-carbon catalysts) during prolonged exposure to reaction conditions.
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            ELECTROCHEMISTRY. High-performance transition metal-doped Pt₃Ni octahedra for oxygen reduction reaction.

            Xiaoqing Huang, Zipeng Zhao, Liang Cao … (2015)
            Bimetallic platinum-nickel (Pt-Ni) nanostructures represent an emerging class of electrocatalysts for oxygen reduction reaction (ORR) in fuel cells, but practical applications have been limited by catalytic activity and durability. We surface-doped Pt3Ni octahedra supported on carbon with transition metals, termed M-Pt3Ni/C, where M is vanadium, chromium, manganese, iron, cobalt, molybdenum (Mo), tungsten, or rhenium. The Mo-Pt3Ni/C showed the best ORR performance, with a specific activity of 10.3 mA/cm(2) and mass activity of 6.98 A/mg(Pt), which are 81- and 73-fold enhancements compared with the commercial Pt/C catalyst (0.127 mA/cm(2) and 0.096 A/mg(Pt)). Theoretical calculations suggest that Mo prefers subsurface positions near the particle edges in vacuum and surface vertex/edge sites in oxidizing conditions, where it enhances both the performance and the stability of the Pt3Ni catalyst.
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              Biaxially strained PtPb/Pt core/shell nanoplate boosts oxygen reduction catalysis

              Lingzheng Bu, Nan Zhang, Shaojun Guo … (2016)
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                Author and article information

                Contributors
                Christoph Janiak: (View ORCID Profile)
                Kenneth I. Ozoemena: (View ORCID Profile)
                Xiao-Yu Yang: (View ORCID Profile)
                Journal
                Journal ID (publisher-id): CHCOFS
                Title: Chemical Communications
                Abbreviated Title: Chem. Commun.
                Publisher: Royal Society of Chemistry (RSC)
                ISSN (Print): 1359-7345
                ISSN (Electronic): 1364-548X
                Publication date Created: February 1 2021
                Publication date (Electronic): 2021
                Volume: 57
                Issue: 8
                Pages: 986-989
                Affiliations
                [1 ]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing & School of Materials Science and Engineering, Wuhan University of Technology
                [2 ]Wuhan
                [3 ]China
                [4 ]School of Chemical Engineering and Technology
                [5 ]Sun Yat-sen University (SYSU), (Guangdong, Zhuhai) & Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai)
                [6 ]Zhuhai
                [7 ]Institut für Anorganische Chemie und Strukturchemie, Heinrich-Heine-Universität Düsseldorf
                [8 ]40204 Düsseldorf
                [9 ]Germany
                [10 ]Molecular Sciences Institute
                [11 ]School of Chemistry
                [12 ]University of the Witwatersrand
                [13 ]Private Bag 3
                [14 ]Johannesburg 2050
                Article
                DOI: 10.1039/D0CC06876D
                PubMed ID: 33438697
                SO-VID: 04d30aaa-76f0-44e6-bad8-cf6a77af748a
                Copyright © © 2021
                License:

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

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