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Silicene,as an analogue of graphene,has attracted great interests for its application in gas sensor.Here we demonstrate that the competition between Pauli exclusion and H-bonding dominates the adsorption of H2O on silicene through first-principles calculations.It explains the bewildering problem that isolated H2O is inert on silicene while isolated NH3 tends to chemisorption.Moreover,Pauli exclusion can be overcome by the synergetic effect of Si…O dative bonding and intermolecular H-bonding.As a result,H2O molecules are readily to chemisorb in clusters.It is expected that the competition is general in polar molecule adsorption on silicene,and thus crucial for the adsorption mechanism.