Nitrogen-doped graphene supported Pt nanoparticles with enhanced performance for methanol oxidation

Facile one-pot hydrothermal synthesis and electrochemical properties of carbon nanospheres supported Pt nanocatalysts

“…6b also shows the forward scanning oxidation peak potential (E f ), forward scanning oxidation peak current (j f ), backward scanning oxidation peak potential (E b ) and backward scanning oxidation peak current (j b ) of Pt/CN-1 and Pt/CN-2 electrodes which were systematic summarized in Table 1. The j f on Pt/ CN-1 electrode is about 2.48 times and 1.90 times than that of Pt/CN-2 and the commercial Pt/C catalyst [20], and even shows better methanol electrooxidation property at the same testing condition than that of the graphene supported Pt nanocatalysts [21,22], demonstrating an enhanced electrocatalytic performance of Pt/CN-1 for MOR.…”

One step synthesis of chlorine-free Pt/Nitrogen-doped graphene composite for oxygen reduction reaction

“…These features correspond to the planar motion of the sp 2 -hybridized carbon atoms in the graphene layer, and to phonon scattering on sp 3 carbon atoms at structural defects and close to the layer edges. The intensity ratio of these peaks is correlated with the number of vacancies in the carbon structure [32]. The 2D and the D+G bands are also visible with small intensity at around 2700 and 2930 cm −1 , respectively.…”

“…N-doping was typically achieved by the thermal treatment of the carbon support (graphene or GO) in the presence of a nitrogen source, e.g. dicyanidamide [31], polyanline [32], polypyrrol [33], pyrrol [34], urea [30], nitrogen plasma [29] or ammonia [28], and Pt nanoparticles were synthesized in a subsequent step by the in situ reduction of e.g. hexachloroplatinic acid or platinum carbonyl complexes.…”

Enhanced electrocatalytic activity of Pt nanoparticles supported on functionalized graphene for methanol oxidation and oxygen reduction

“…GO nanosheets were synthesized from natural graphite by a modified Hummers' method [23]. MV-RGO has been synthesized by reduction of GO in the presence of MV in situ.…”

“…The positively charged functional groups of MV enforced sufficient electrostatic repulsion against the van der Waals attraction of the RGO sheets, which facilitate wetting of RGO with Pt precursors and enable homogeneous dispersion of Pt particles. In addition, the N-containing groups at the surface of the RGO, which were introduced by MV, would also facilitated dispersion of Pt NPs [23]. Fig.…”