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Nano energy v.31, 2017년, pp.456 - 461   SCIE
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Platinum-nickel hydroxide nanocomposites for electrocatalytic reduction of water

Wang, Lei (Nano-Bionics Division and i-Lab, Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, Jiangsu 215123, China ) ; Zhu, Yihan (Advanced Membranes and Porous Materials Center, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia ) ; Zeng, Zhenhua (School of Chemical Engineering, Purdue University, West Lafayette, IN 47907, USA ) ; Lin, Chong (Nano-Bionics Division and i-Lab, Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, Jiangsu 215123, China ) ; Giroux, Michael (Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD 21218, USA ) ; Jiang, Lin (Institute of Functional Nano & Soft Materials (FUNSON), Jiangsu Key Laboratory for Carbon Based Functional Materials & Devices and Collaborative Innovation Center of Suzhou Nano Science & Technolo ) ; Han, Yu ; Greeley, Jeffrey ; Wang, Chao ; Jin, Jian ;
  • 초록  

    Abstract Water electrolysis represents a promising solution for storage of renewable but intermittent electrical energy in hydrogen molecules. This technology is however challenged by the lack of efficient electrocatalysts for the hydrogen and oxygen evolution reactions. Here we report on the synthesis of platinum-nickel hydroxide nanocomposites and their electrocatalytic applications for water reduction. An in situ reduction strategy taking advantage of the Ni(II)/Ni(III) redox has been developed to enable and regulate the overgrowth of Pt nanocrystals on single-layer Ni(OH) 2 nanosheets. The obtained nanocomposites (denoted as Pt@2D-Ni(OH) 2 ) exhibit an improvement factor of 5 in catalytic activity and a reduction of up to 130mV in overpotential compared to Pt for the hydrogen evolution reaction (HER). A combination of electron microscopy/spectroscopy characterizations, electrochemical studies and density function theory calculations was employed to uncover the structures of the metal-hydroxide interface and understand the mechanisms of catalytic enhancement. Highlights Developed the overgrowth of Pt nanocrystals on single-layer Ni(OH) 2 nanosheets Demonstrated 5-times improvement in electrocatalytic activity for water reduction Revealed a Pt-Ni-OH type of interface as the catalytically active sites Depicted the reaction pathway of water reduction at the Pt-Ni-OH interface Graphical abstract [DISPLAY OMISSION]


  • 주제어

    Platinum-nickel hydroxide nanocomposites .   Hydrogen evolution reaction .   Water electrolysis .   Two-dimenstional nickel hydroxide nanosheets.  

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