부산대학교 도서관

We report on Co Mo B nanoparticles supported on foam Ni as catalysts for hydrogen generation from hydrolysis of ammonia borane (NH 3 BH 3) solution. The Co Mo B/foam Ni catalysts with different molar ratios of Co2+and MoO 4 2− were synthesized via the electroless-deposition technique at ambient temperature. In order to analyze the phase composition, chemical composition, microstructure, and electron bonding structure of the as-prepared samples, powder X–ray diffraction (XRD), inductively coupled plasma-mass spectroscopy (ICP-MS), scanning electron microscopy (SEM), atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS) were used. The results showed that Co Mo B nanoparticles were variously dispersed on the surface of the foam Ni and the catalytic activity correlated with the molar ratio of Co2+ and MoO 4 2−. The highest hydrogen generation rate was 5331.0 mL min−1 g cat −1 at 298 K, and the activation energy was calculated to be 45.5 kJ mol−1 toward the hydrolysis of NH 3 BH 3 solution. The better catalytic activity was largely attributed to the smaller particle size, higher surface roughness and the novel three-dimensional cone-like architectures of the obtained samples. The kinetic results show that the hydrolysis of NH 3 BH 3 is a first-order reaction in catalyst concentration. In addition, the reusability experiment exhibited that the catalytic activity was reduced after 5 cycles and the reason of the decay was also investigated. • Co Mo B nanoparticles are prepared by electroless-deposition method at ambient temperature. • The novel three-dimensional cone-like architecture and small particle size are beneficial to enhance the catalytic activity. • The as-obtained Co Mo B catalyst shows an enhanced catalytic activity for NH 3 BH 3 hydrolysis. [ABSTRACT FROM AUTHOR]