Functionalizing Reduced Graphene Oxide with Ru‐Organometallic Compounds as an Effective Strategy to Produce High‐Performance Pt Nanocatalysts for the Methanol Oxidation Reaction

Abstract

An efficient route to chemically functionalize reduced graphene oxide (rGO) with ruthenium organometallic compounds and the subsequent anchorage of Pt nanoparticles is reported. Two organometallic complexes, [(η6‐C6H5OCH2CH2OH) RuCl2]2 (Ru‐dim) and [(η6‐C6H4(CHMe2)Me)RuCl2]2 (Ru‐cym), as well as commercial RuCl3 ⋅ XH2O (Ru‐com) have been synthetized an used as functionalizing agents. By implementing a conventional polyol synthesis method, the Pt/rGORu‐dim, Pt/rGORu‐cym, Pt/rGORu‐com and Pt/rGO nanocatalysts have been synthetized. Characterization by XRD indicates that the presence of Ru leads to the formation of Pt−Ru alloyed phases due to overlapping of Pt fcc and Ru hcp reflections. When characterized for the methanol oxidation reaction (MOR) in acid media, Pt/rGORu‐dim reached a mass current density of 491.49 mA mgPt−1, higher than those generated by the other nanocatalysts. The results show that the functionalization of rGO with Ru‐dim remarkably increases the catalytic activity of Pt for the MOR, suggesting Pt−Ru metal−metal interactions that promotes the anodic reaction.

Achieving superior methanol oxidation electrocatalytic performance by surface reconstruction of PtNi nanoalloys during acid etching process

“…These characteristics imply the formation of the PtNi alloy phase in the nickel-rich PtNi 3 -NGA catalyst and the presence of metal nickel. 42 Most importantly, the peaks in the pattern of Pt 1.5 Ni-NGA exhibit a negative shift trend compared to that of the PtNi 3 -NGA catalyst, which is in accordance with the HRTEM data (Fig. 1f and h).…”

High-Grade Biofuel Synthesis from Paired Electrohydrogenation and Electrooxidation of Furfural Using Symmetric Ru/Reduced Graphene Oxide Electrodes

“…The Raman spectra of Ru NPs in Figure 2b shows two intense peaks at 494 and 612 cm −1 corresponding to the Ru−O A 1g and E g orbitals, which indicated Ru NP atmospheric surface oxidation. 34 Microwave-assisted chemical RGO reduction exhibited two intense prominent peaks at 1348 and 1600 cm −1 corresponding to the defect D band (sp 3 ) and the graphitic G band (sp 2 ), respectively. 29,34 In general, the D band arose due to the presence of oxygen moieties on RGO surfaces, and the G band is due to the in-plane sp 2 (C=C) aromatic carbon structure vibration existing on the as-prepared RGO under microwave irradiation.…”

“…34 Microwave-assisted chemical RGO reduction exhibited two intense prominent peaks at 1348 and 1600 cm −1 corresponding to the defect D band (sp 3 ) and the graphitic G band (sp 2 ), respectively. 29,34 In general, the D band arose due to the presence of oxygen moieties on RGO surfaces, and the G band is due to the in-plane sp 2 (C=C) aromatic carbon structure vibration existing on the as-prepared RGO under microwave irradiation. 30 The RGO defect level was estimated as 0.986 through the I D / I G intensity ratio, which was lower than that of RGO prepared from other chemical reduction processes.…”

Cost-effective functionalization of Vulcan XC-72 by using the intermittent microwave heating process as nanocatalyst support for ethanol electrooxidation in acid media

“…3). Additionally, a clear peak due to C=O species at BE= 289.35 eV is observed in the spectrum of Pt/C-MeOH2 (Arteaga et al, 2019;Adriana A. Siller-Ceniceros et al, 2019;X. Wang et al, 2015), which is not detected at Pt/C-CA1.…”