Polyaniline-coated glassy carbon microspheres decorated with nano-palladium as a new electrocatalyst for methanol oxidation

Investigation of Pd2B- and NiB-Doped Pd–Ni/C Electrocatalysts with High Activity for Methanol Oxidation

“…Figure b shows CVs of the Pd–Ni/C-15, Pd–Ni/C-20, Pd–Ni/C-25, Pd–Ni/C-30, and Pd–Ni/C-35 catalysts performed at a scan rate of 50 mVs –1 from −0.80 to 0.40 V in 0.1 M KOH + 1 M CH 3 OH solution, for the purpose of evaluating their electrocatalytic performance for the MOR. A characteristic redox peak of Pd for the MOR was generated on the Pd–Ni/C catalyst, in which a positive current peak appeared near −0.05 V was associated with the MOR . The peak potential for the MOR was close to that of the palladium oxide (Pd–O) formed in 0.1 M KOH solution, suggesting that the formation of Pd–O at a high potential went against the MOR .…”

“…where "Q" is the charge collected between 0.1 and 0.5 V, "m" is the Pd loading, and C is 0.42 mC/cm 2 . 59 The 60 The peak potential for the MOR was close to that of the palladium oxide (Pd−O) formed in 0.1 M KOH solution, suggesting that the formation of Pd−O at a high potential went against the MOR. 60 During the reverse scanning process, the Pd oxides began to reduce at −0.25 V, prompting the oxidation of intermediates formed in the positive scanning progress.…”

“…The linearity of the curve indicated that the electrokinetics of the MOR on the Pd−Ni/C-25 catalyst was the diffusion-controlled process, further implying its excellent electrocatalytic performance. 60 Chronoamperometries 65 Afterward, the current value of the Pd−Ni/C catalyst began to decrease due to the accumulation of carbonaceous toxic substances generated during the MOR process, which occupied and blocked active sites on the surface of the electrocatalyst. 66 It could be also seen from Figure 5 that the current value tended to stabilize after a period of time because the catalytic reaction reached a pseudo-steady state caused by the adsorption of oxygenated and intermediate species, while their redox reaction remained relatively balance, which resulted in the surface activation, with the help of the adsorbed anionic or dipolar species on the catalyst surface.…”

“…60 During the reverse scanning process, the Pd oxides began to reduce at −0.25 V, prompting the oxidation of intermediates formed in the positive scanning progress. 60 The mass-normalized current density was obtained through the Pd loading of the Pd−Ni/C catalyst measured by AAS. 16 The mass-specific current densities of the MOR on the Pd−Ni/C-15, Pd−Ni/C-20, Pd−Ni/C-25, Pd−Ni/C-30, and Pd−Ni/C-35 catalysts were respectively 959.5, 1105.7, 1406.5, 1207, and 555.3 mA mg −1 Pd, which were compared to the Pd/C catalysts reported in the literature and listed in Table 2.…”

Advancements in Noble Metal-Decorated Porous Carbon Nanoarchitectures: Key Catalysts for Direct Liquid Fuel Cells

“…The surface functionalization of porous carbon nanoarchitectures with a variety of polymers has aroused growing interest in the electrocatalysis field. 207 Specifically, a rational coating of functional polymers is an effective strategy to prevent reaggregation or restacking of porous nanocarbons during the synthetic process. It also activates their chemically inert surfaces to induce additional catalytic capacities.…”