Oxygen reduction reaction at few-layer graphene structures obtained via plasma-assisted electrochemical exfoliation of graphite

Graphene Nanosheets Stabilized by P3HT Nanoparticles for Printable Metal-Free Electrocatalysts for Oxygen Reduction

“…The G/P3HT sample also exhibited similar two wave oxygen reduction characteristics with an onset of oxygen reduction potential observed at −0.19 V and the half-wave potential of the first wave of oxygen reduction observed at −0.26 V (Figure c), which indicate that the active sites for the ORR are populating on the surface of graphene. Moreover, G/P3HT exhibited a stronger limiting diffusion current of −2.25 mA cm –2 (at −0.8 V) compared to the reported electrochemically exfoliated few-layer graphene structures . This indicates that the intermolecular charge transfer between P3HT nanoparticles and graphene, and higher mass diffusion in the G/P3HT electrocatalyst layer enhances reaction kinetics for efficient electrocatalytic oxygen reduction.…”

“…Moreover, G/ P3HT exhibited a stronger limiting diffusion current of −2.25 mA cm −2 (at −0.8 V) compared to the reported electrochemically exfoliated few-layer graphene structures. 45 This indicates that the intermolecular charge transfer between P3HT nanoparticles and graphene, and higher mass diffusion in the G/P3HT electrocatalyst layer enhances reaction kinetics for efficient electrocatalytic oxygen reduction. The active sites for the ORR in the G/P3HT sample can be attributed to the small amount of C-O and C�O functional groups present on the surface of graphene (obtained from XPS, Figure S10 in the Supporting Information), which is expected to be present as an edge group.…”

“…The G/P3HT sample showed a thick electrochemical double layer with clearly visible onset of oxygen reduction at a relatively lower potential compared to the commercial Pt/C electrocatalyst. Electrochemically exfoliated few-layer graphene structures have been reported to exhibit two waves of oxygen reduction, with an onset of oxygen reduction potential observed at −0.19 V (vs Ag/AgCl in 0.1 M KOH), and the half-wave potential of the first wave of oxygen reduction observed in the range of −0.255 to −0.265 V. 45 The G/P3HT sample also exhibited similar two wave oxygen reduction characteristics with an onset of oxygen reduction potential observed at −0.19 V and the half-wave potential of the first wave of oxygen reduction observed at −0.26 V (Figure 4c), which indicate that the active sites for the ORR are populating on the surface of graphene. Moreover, G/ P3HT exhibited a stronger limiting diffusion current of −2.25 mA cm −2 (at −0.8 V) compared to the reported electrochemically exfoliated few-layer graphene structures.…”

A Facile Synthesis of Noble-Metal-Free Catalyst Based on Nitrogen Doped Graphene Oxide for Oxygen Reduction Reaction

“…In general, bmGO and NbmGO are characterized by a significant decrease in the ORR overvoltage and higher n values as compared to glassy carbon. This is an indicator of a high concentration of active centers for the adsorption of both oxygen molecules on the surface of bmGO and NbmGO and intermediates of its reduction, which can be surface defects and edge regions of graphene-like structures [34], quinone groups [35], and pyridine nitrogen atoms in the case of the NbmGO sample [27,36], as shown earlier [37].…”