Hydrolytic dehydrogenation of ammonia borane catalyzed by poly（amidoamine） dendrimers-modified reduced graphene oxide nanosheets supported Ag_0.3Co_0.7 nanoparticles

Dandan Ke^1,2，Jin Wang^1,2，Hongming Zhang^1,2，Yuan Li^1,2，Lu Zhang^1,2，Xin Zhao³，Shumin Han^1,2

1. Hebei Key Laboratory of Applied Chemistry,School of Environmental and Chemical Engineering,Yanshan University2. State Key Laboratory of Metastable Materials Science and Technology,Yanshan University3. School of Materials and Metallurgy,Inner Mongolia University of Science and Technology

摘 要：Poly（amidoamine） dendrimers-modified reduced graphene oxide nanosheets（PAMAM/rGO） composite was selected as a carrier of heterogeneous Ag_0.3Co_0.7 nanoparticles in order to obtain an excellent catalyst for ammonia borane（AB） hydrolysis. During the synthetic processes, GO could easily assembled with PAMAM by the electrostatic and hydrogen-bonding interactions. Structural characterization revealed that Ag_0.3Co_0.7 bimetallic nanoparticles with uniform size distribution of 5 nm are well dispersed on PAMAM/rGO composite architecture. Ag_0.3Co_0.7@PAMAM/rGO was found to be a highly active and reusable catalyst in hydrogen generation from the hydrolysis of AB with a turnover frequency value（TOF） of 19.79 mol_H2 min^-1 mol_M^-1 at 25.0±0.1℃ and retained 75.4% of their initial activity with a complete release of hydrogen in five runs. The relatively high TOF value and low apparent activation energy(34.21 kJ mol^-1) make these Ag_0.3Co_0.7@PAMAM/rGO NPs as a high-efficient catalyst for catalytic dehydrogenation of AB facilitating the development of practically applicable energy storage materials.

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