Facile synthesis of flower-like platinum nanostructures as an efficient electrocatalyst for methanol electro-oxidation

Facile synthesis of 3D flower-like Pt nanostructures on polypyrrole nanowire matrix for enhanced methanol oxidation

“…The above reported results conrm that the electrocatalytic properties of the PtNF/PPyNW system tested against methanol oxidation are due to the combined effect of Pt ower-like morphology and 3D open structure of PPy polymeric matrix providing, in comparison with Ptclust/PPyNW system, larger catalytic active surface area and faster electron transfer, inhibiting the undesired agglomeration of active sites and minimizing poisoning effect by intermediated species of methanol oxidation process. Moreover, the developed system exhibits enhanced or similar electrocatalytic performances in comparison with most of Pt nanoower-based catalysts applied in methanol electroxidation, in terms of oxidation potential, j f /j b values 10,12,14,22,24,25,36 and mass activity. 12,31,36 Effect of potential scan rate and methanol concentration.…”

“…5 The assembly of nanocomposites integrating PtNF and 3D support materials has been recently proposed. Zhang et al 24 fabricated a graphene 3D foam by using a nickel foam as template and subsequently depositing Pt ower-like nanoparticles by galvanic replacement reaction between Ni and Pt. The observed enhanced catalytic behavior is induced, according to authors, by the highly dispersed Pt nanoparticles with more exposed active sites, indicating the high utilization of Pt.…”

“…The use of a whole electrochemical approach results to be benecial respect to chemical synthesis routes 21,25 requiring organic ligand stabilizers which can be difficult to separate and can have a negative impact on the performance of the catalysts, and using multi-step, time consuming and complex procedures limiting applicability and large-scale production. In addition, the use of an electrochemically synthesized nanostructured conducting polymer as support material, contrarily to other developed 3D structure integrating PtNFs, 24,25 offers the additional benets of properly tuning its morphology by controlling some experimental parameters, 27 also in relation to the desired (catalytic) applications, by using a low-cost, commercially available technology.…”

Metal‐Based Electrocatalysts for Methanol Electro‐Oxidation: Progress, Opportunities, and Challenges

“…Pt-CHO + Pt-OH + 2OH -→ 2Pt + CO2 + 2H2O + 2e - (11) In spite of the above-proposed mechanisms of MOR in acidic or alkaline media, it is still challenging to accurately probe the actual MOR process, especially at a real-time and molecular level. Moreover, since so many intermediates are produced during the catalysis [49,[64][65][66][67][68][69][70] nanocubes, [71] nanoflowers, [72,73] nanowires, [74,75] nanosponges, [76] nanoframes [77] . Besides, nanoparticles with superior durability in long-term and extreme operation condition in a full stack DMFC.…”

Promoting effects of Fe 2 O 3 to Pt electrocatalysts toward methanol oxidation reaction in alkaline electrolyte

“…The typical cathodic and anodic peaks in the low potential region of 0.08 to 0.42 V were ascribed to the adsorption and desorption of hydrogen on the surface of Pt. These peaks were associated with the three low index crystal faces of Pt(110), (100) and (111), and could be used to calculate the electrochemically active surface area (EAS) of Pt in the two Pt-Fe2O3/C samples based on the following equation [20][21][22][23][24]: EAS (m 2 /gPt) = QH / (0.21×WPt) where, QH is the charge consumed for the desorption and adsorption process of hydrogen on the surfaces of Pt nanoparti-cles, corresponding to the integrated peak area of the hydrogen-desorption (or anode hydrogen peak) in the positive scanning curve, WPt is the Pt loading on the working electrodes, and 0.21 is the theoretical quantity of the electric charge (mC/cm 2 ) for the surface of the Pt electrode, supposing that the Pt atoms are covered with monolayer hydrogen and the surface density of Pt is 1.3 × 10 15 atoms/cm 2 [24]. The EAS of Pt-Fe2O3/C-R and Pt-Fe2O3/C-P catalysts are 32.7 and 39.9 m 2 /gPt, respectively.…”