One of the most attractive characteristics of Pd is its remarkable
capacity for hydrogen storage; being able to absorb up to 900 times
of its own volume of H2 at room temperature and atmospheric
pressure [2]. Pd can also serve as an effective catalyst in organic
reactions and fuel cells [6]. Various graphene–Pd composites have been prepared by similar synthetic strategies to those used for the preparation of graphenebased Au, Ag and Pt nanostructures [95–106]. For example, Pd NPs grown on GO surfaces were achieved by simply refluxing H2PdCl4 and GO in a water–ethylene glycol solution [48]. In addition, some novel synthetic methods were developed for the preparation of graphene-templated Pd nanostructures, such as the laser reduction method [103], plasma-assisted reduction [104] and the sacrificial Cu template-mediated method [100].