Sputter-deposited Pt nanoparticle/multi-walled carbon nanotube composite catalyst for oxygen reduction reaction

PdPt alloy nanocubes as electrocatalysts for oxygen reduction reaction in acid media

“…This is in agreement with previous studies of O 2 reduction on Pd and Pt catalysts in acid media [11,18,[25][26][27].…”

“…At high overpotentials the Tafel slope value was over -130 mV, which is slightly higher than that reported for Pd and Pt electrodes in early work [25,28]. Similar slope values have been found for different Pd-and Pt-based catalysts [18,26,27,29,30].…”

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

“…5a-d. The reduction of oxygen proceeds mainly via the four-electron pathway yielding water in the case of Pt/NG_500°C and Pt/NG_600°C, which is in accordance with previous studies in the literature [9,31,63]. However, the two electron pathway with H2O2 formation is more significant in case of Pt/NG_700°C.…”

“…The slopes in the high current density region were 150, 142, 147, and 120 mV/decade for the same samples. These values are comparable with those reported in the literature for similar systems, which implies that the rate determining step is the same for every electrode in this region [9,[58][59][60]. When the slope of the polarization curve is around 60 mV/decade, the electrode surface is under Temkin adsorption conditions.…”

“…Pt particle loss from the surface and support grain agglomeration both induce a loss of activity [8]. Carbon nanotubes [9], nitrogen-doped carbon nanotubes [10,11] and graphitic carbon nanofibers [12] were investigated earlier as potential alternatives.…”