Dimethylamine borane (DMAB) has been considered as one of the important hydrogen sources with a simple process by the help of the efficient catalyst. For this purpose, herein, platinum nanoparticles (Pt NPs), placed inside carbon black hybrid (Pt NPs@CBH), activated carbon (Pt NPs@AC) and Vulcan carbon (Pt NPs@VC), have been prepared as highly monodisperse catalysts for dehydrogenation reactions of DMAB at room temperature. The morphological and physical structure of the monodisperse catalysts have been identified by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) etc. The typical face-centered cubic (fcc) structure of the all prepared catalysts was verified from X-ray diffractogram. All prepared catalytic materials were measured as high-performance catalysts for dehyrocoupling of DMAB; but, Pt NPs@CBH catalyst indicated the better catalytic activity compared to the other prepared ones. Easy utilization at very small concentrations and temperature, monodisperse Pt NPs@CBH perform an eye-catching catalytic activity with providing one of the best TOF (70.28 h(-1)) and Ea (93.56 +/- 2 kJ/mol) for dehydrocoupling of DMAB. (C) 2018 Elsevier Inc. All rights reserved.