Nanocomposite catalyst containing palladium-nickel boride-silica and reduced graphene oxide (Pd@Ni x B-SiO 2 /RGO, abbreviated as Pd@NSG) was successfully fabricated and discussed its enhanced hydrogen spillover mechanism and high catalytic performance towards reduction of 4-nitrophenol (4-NP) 10 to 4-aminophenol (4-AP). The structure, composition and morphology of Pd@NSG nanocomposite were characterized by various techniques. The H 2 adsorption experiment directly reveals the spillover effect on Pd@NSG nanocomposite and enhanced H 2 uptake capacity (0.7 wt. %) compared to SiO 2 /RGO (0.05 wt. %) under 50 bar pressure at RT. 4-NP reduction reaction shows remarkably high activity (120 s) of Pd@NSG compared to Ni x B-SiO 2 /RGO (7200 s) with excellent stability up to 5 cycles. Both the 15 experiments showed, the facile H 2 dissociation on Pd (active sites) activator and subsequent transportation of hydrogen atom on receptor sites (Ni x B-SiO 2 /RGO and 4-NP, respectively). 30 nanocomposite with high performance. 11

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An effective strategy is proposed for building enhanced versatile detector array towers with new types of behaviors and unprecedented applications.

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