Structural and Electronic Effects of Carbon-Supported PtxPd1−x Nanoparticles on the Electrocatalytic Activity of the Oxygen-Reduction Reaction and on Methanol Tolerance

2010 ◽  
Vol 16 (36) ◽  
pp. 11064-11071 ◽  
Author(s):  
Shih-Hong Chang ◽  
Wei-Nien Su ◽  
Min-Hsin Yeh ◽  
Chun-Jern Pan ◽  
Kuan-Li Yu ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Electrocatalytic Activity ◽  
Reduction Reaction ◽  
Electronic Effects ◽  
Methanol Tolerance

Methanol-Tolerant Oxygen Reduction Reaction at Pt–Pd/C Alloy Nanocatalysts

2010 ◽  
Vol 8 (1) ◽  
Author(s):  
A. Mary Remona ◽  
K. L. N. Phani
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Rotating Disk ◽  
Reduction Reaction ◽  
Rotating Disk Electrode ◽  
Methanol Tolerance ◽  
Pd Catalysts ◽  
Onset Potential ◽  
Direct Methanol ◽  
Methanol Tolerant

Carbon-supported platinum and Pt–Pd alloy electrocatalysts with different Pt/Pd atomic ratios were synthesized by a microemulsion method at room temperature (metal loading is 10 wt %). The Pt–Pd/C bimetallic catalysts showed a single-phase fcc structure and the mean particle size of Pt–Pd/C catalysts was found to be lower than that of Pt/C. The methanol-tolerant studies of the catalysts were carried out by activity evaluation of oxygen reduction reaction (ORR) on Pt–Pd catalysts using a rotating disk electrode (RDE). The studies indicated that the order of methanol tolerance was found to be PtPd3/C>PtPd/C>Pt3Pd/C. The oxygen reduction activities of all Pt–Pd/C were considerably larger than that of Pt/C with respect to onset and overpotential values. The Pd-loaded catalysts shift the onset potential of ORR by 125 mVMSE, 53 mVMSE, and 41 mVMSE to less cathodic potentials for Pt3Pd/C, PtPd/C, and PtPd3/C, respectively, with reference to Pt/C and the Pt3Pd/C catalyst showed greater shift in the onset value than the other PtPd catalysts reported in literature. Moreover, the Pt–Pd/C catalysts exhibited much higher methanol tolerance during ORR than the Pt/C, assessing that these catalysts may function as a methanol-tolerant cathode catalysts in a direct methanol fuel cell.

scholarly journals Enhanced Electrocatalytic Activity and Stability toward the Oxygen Reduction Reaction with Unprotected Pt Nanoclusters

Nanomaterials ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 955 ◽  
Author(s):  
Jing Liu ◽  
Jiao Yin ◽  
Bo Feng ◽  
Tao Xu ◽  
Fu Wang
Keyword(s):  
Carbon Nanotubes ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Specific Activity ◽  
Catalytic Performance ◽  
Reduction Reaction ◽  
Top Down ◽  
Methanol Tolerance ◽  
Pt Nanoclusters ◽  
Mass Activity

The Pt particles within diameters of 1–3 nm known as Pt nanoclusters (NCs) are widely considered to be satisfactory oxygen reduction reaction (ORR) catalysts due to higher electrocatalytic performance and cost effectiveness. However, the utilization of such smaller Pt NCs is always limited by the synthesis strategies, stability and methanol tolerance of Pt. Herein, unprotected Pt NCs (~2.2 nm) dispersed on carbon nanotubes (CNTs) were prepared via a modified top-down approach using liquid Li as a solvent to break down the bulk Pt. Compared with the commercial Pt/C, the resultant Pt NCs/CNTs catalyst (Pt loading: 10 wt.%) exhibited more desirable ORR catalytic performance in 0.1 M HClO4. The specific activity (SA) and mass activity (MA) at 0.9 V for ORR over Pt NCs/CNTs were 2.5 and 3.2 times higher than those over the commercial Pt/C (Pt loading: 20 wt.%). Meanwhile, the Pt NCs/CNTs catalyst demonstrated more satisfactory stability and methanol tolerance. Compared with the obvious loss (~69%) of commercial Pt/C, only a slight current decrease (~10%) was observed for Pt NCs/CNTs after the chronoamperometric measurement for 2 × 104 s. Hence, the as-prepared Pt NCs/CNTs material displays great potential as a practical ORR catalyst.

Tailoring molecular architectures of Fe phthalocyanine on nanocarbon supports for high oxygen reduction performance

2015 ◽  
Vol 3 (18) ◽  
pp. 10013-10019 ◽  
Author(s):  
Shiming Zhang ◽  
Heyou Zhang ◽  
Xing Hua ◽  
Shengli Chen
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Alkaline Solution ◽  
Electrocatalytic Activity ◽  
Reduction Reaction ◽  
High Oxygen ◽  
Molecular Architectures

Tailored molecular architectures of FePc on nanocarbon supports from nanorods to uniform shells exhibit excellent electrocatalytic activity for the oxygen reduction reaction in alkaline solution.

Facile preparation of N-doped mesocellular graphene foam from sludge flocs for highly efficient oxygen reduction reaction

2015 ◽  
Vol 3 (29) ◽  
pp. 15171-15176 ◽  
Author(s):  
Daixin Ye ◽  
Li Wang ◽  
Ren Zhang ◽  
Baohong Liu ◽  
Yi Wang ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Electrocatalytic Activity ◽  
Reduction Reaction ◽  
Methanol Tolerance ◽  
High Quality ◽  
Graphene Foam ◽  
Sludge Flocs ◽  
Pyrolysis Method ◽  
One Step ◽  
Facile Preparation

Sludge flocs (SF) from environmental waste were used to prepare high-quality N-doped mesocellular graphene foam (SF-NMGF)viaa simple one-step pyrolysis method. The SF-NMGF had a high electrocatalytic activity, operational stability and methanol-tolerance in the ORR.

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