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Water on silicene: A hydrogen bond-autocatalyzed physisorption–chemisorption–dissociation transition

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Abstract

A single water molecule is nothing special. However, macroscopic water displays many anomalous properties at interfaces, such as hydrophobicity and hydrophilicity. Although the underlying mechanisms remain elusive, hydrogen bonds between water molecules are expected to play a major role in these interesting phenomena. An important question concerns whether water clusters containing few molecules are qualitatively different from a single molecule. Using the water adsorption behavior as an example and by carefully choosing two-dimensional silicene as the substrate material, we demonstrate that water monomers, dimers, and trimers show distinct adsorption properties at the substrate surface. On silicene, the additional water molecules in dimers and trimers induce a transition from physisorption to chemisorption and then to dissociation, arising from the enhancement of charge transfer and proton transfer processes induced by hydrogen bonding. Such a hydrogen bond autocatalytic effect is expected to have broad applications in metal-free catalysis for the oxygen reduction reaction and water dissociation.

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Acknowledgements

This paper is partially supported by the National Key Research & Development Program of China (No. 2016YFA0200604), National Natural Science Foundation of China (Nos. 21233007, 21421063, and 21688102), and Chinese Academy of Sciences (No. XDB01020300). This work is also partially supported by the Scientific Discovery through Advanced Computing (SciDAC) Program funded by U.S. Department of Energy, Office of Science, Advanced Scientific Computing Research and Basic Energy Sciences (W. H.). We thank the National Energy Research Scientific Computing (NERSC) center, and the USTCSCC, SC-CAS, Tianjin, and Shanghai Supercomputer Centers for the computational resources.

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  1. Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, 230026, China

    Wei Hu, Zhenyu Li & Jinlong Yang

  2. Computational Research Division, Lawrence Berkeley National Laboratory, Berkeley, California, 94720, USA

    Wei Hu

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  1. Wei Hu
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Correspondence to Wei Hu or Jinlong Yang.

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Hu, W., Li, Z. & Yang, J. Water on silicene: A hydrogen bond-autocatalyzed physisorption–chemisorption–dissociation transition. Nano Res. 10, 2223–2233 (2017). https://doi.org/10.1007/s12274-016-1411-4

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