Bimetallic palladium-cobalt nanomaterials as highly efficient catalysts for dehydrocoupling of dimethylamine borane

In this work, we report the synthesis, characterization and application of graphene oxide stabilized PdCo nanoparticles (PdCo@GO) for the dehydrocoupling of dimethylamine borane (DMAB) as a model reaction. Bimetallic graphene oxide stabilized PdCo nanoparticles were readily synthesized using an ultrasonic reduction technique, in which both metals of Pd and Co were reduced with GO. The dispersion of PdCo nanoparticles on the surface of GO was enhanced with the help of the ultrasonic reduction method which result in the enhancing of dispersion of both metals without any agglomeration problem. The characterization studies revealed that graphene oxide stabilized PdCo nanoparticles have a uniform, homogeneous distribution on graphene oxide and an average particle size of 3.48 ± 0.22 nm. After fully characterization of graphene oxide stabilized PdCo nanoparticles, they have been tried in model reaction as a catalyst and exhibited a high catalytic performance compared the previous catalysts in literature with a TOF value of 226.80 h-1. The investigation of kinetic parameters showed that graphene oxide stabilized PdCo nanoparticles have very high negative entropy (?S: -170.85 J mol-1 K-1) value and a low activation energy value (Ea: 17.53 ± 2 kJ mol-1) for the model reaction. © 2019 Hydrogen Energy Publications LLC2014-05The authors would like to thank Kutahya Dumlupinar University ( 2014-05 ) for financial support. Appendix

Binary Palladium–Nickel/Vulcan carbon-based nanoparticles as highly efficient catalyst for hydrogen evolution reaction at room temperature

Herein, Palladium–Nickel alloy nanoparticles assembled on Vulcan carbon composites (PdNi@VC) have been reported as highly efficient, stable and durable catalyst for the hydrogen evolution from dimethylamine borane. Palladium–Nickel alloy nanoparticles assembled on Vulcan carbon composites were prepared using ultrasonic reduction technique and characterized using some analytical methods. The characterization analyses revealed that Palladium–Nickel alloy nanoparticles assembled on Vulcan carbon composites have a monodisperse metal distribution and crystalline structure. Some catalytic experiments were performed, and some activation parameters such as activation energy (Ea=40.05 ± 2 kJ/mol), activation entropy (?S =-132.11± 1 J mol-1 K-1) and activation enthalpy (?H =37.55 ± 1 kJ mol-1) were calculated for catalytic reaction of dimethylamine borane. The turnover frequency (TOF) value of Palladium–Nickel alloy nanoparticles assembled on Vulcan carbon composites was found to be 283.48 h-1, having one of the best catalytic activities among the previous heterogenous catalysts tested for dimethylamine borane (DMAB) catalytic reaction. © 2019 Taiwan Institute of Chemical Engineer