Electrochemical preparation and characterization of PdPt nanocages with improved electrocatalytic activity toward oxygen reduction reaction

Zhang, Geng; Shao, Zhigang; Lu, Wenxian; Xie, Feng; Qin, Xiaoping; Yi, Baolian

doi:10.1016/j.electacta.2013.04.045

Cited by 30 publications

(21 citation statements)

References 59 publications

(67 reference statements)

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“…The performance ranking of different electrocatalysts is in accordance with that previously obtained with j 0 values: Pt 91 Co 9 /C < Pt/C < Pt 88.5 Sn 11.5 /C < Pt 85 Co 5 Sn 10 /C. As shown the Pt 91 Co 9 /C seems to be less efficient electrocatalyst and such observation could be attributed to the particle size increase (Table 1) being partly responsible for the low Pt metal dispersion thereby poor Pt utilization for ORR [36].…”

Section: <Fig 6>supporting

confidence: 92%

Promising ternary Pt–Co–Sn catalyst for the oxygen reduction reaction

Knani

Chirchi

Napporn

et al. 2015

Journal of Electroanalytical Chemistry

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Section: <Fig 6>supporting

confidence: 92%

Promising ternary Pt–Co–Sn catalyst for the oxygen reduction reaction

Knani

Chirchi

Napporn

et al. 2015

Journal of Electroanalytical Chemistry

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“…where j is the experimentally obtained current density, j d is the measured diffusion‐limited current density, j k is the mass‐transport‐free kinetic current density, n is the number of transferred electrons, F is the Faraday constant (96 485 C mol −1 ), D is the oxygen diffusion coefficient (1.9×10 −5 cm −2 s −1 ), c is the oxygen concentration (1.1×10 −6 mol cm −3 ), ν is the kinematic viscosity (1.0×10 −2 cm 2 s −1 ), and ω is the rotation speed (rad s −1 ) . As shown in Figure b and Figure d, the linearity and parallelism of the Koutechy–Levich plots indicated that the oxygen reduction catalyzed by Pt/C and PtAg/C followed a first‐order kinetics pattern . Based on the Koutechy–Levich equation, n was 3.95 and 3.93 for Pt/C and PtAg/C, respectively.…”

Section: Resultsmentioning

confidence: 78%

Enhancing the Oxygen Reduction Reaction Performance by Modifying the Surface of Platinum Nanoparticles

et al. 2015

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The depressing oxygen reduction reaction (ORR) performance has impeded the commercialization of proton exchange membrane fuel cells. As a surface‐sensitive reaction, the surface structure of the electrocatalyst has a crucial impact on the ORR. Herein, Pt nanoparticle surfaces were modified with the aid of Ag, which was deposited on the surface of Pt nanoparticles and was etched away through cyclic voltammetry (CV). After surface modification, the step density of the Pt nanoparticles was observed to decrease, according to high‐resolution transmission electron microscopy images, which could contribute to the positive shift of the Pt 4f binding energy and the improved ability to prevent Pt from being oxidized, as seem by using X‐ray photoelectron spectroscopy. Furthermore, the peak potential increase for the surface metal‐oxide reduction during CV was consistent with the impact of the step density reduction. After surface modification, the Pt nanoparticles showed improved ORR performance, according to half‐cell tests. At the atomic scale, the decrease in the number of low‐coordination atoms on the surface steps, which exhibit stronger interactions with Oads/OHads compared with atoms on terraces, could lead to the enhanced ORR performance.

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“…9d. Hence, the MA of Pt-Co decreased nearly 47 % and comparatively higher than Pt-Ni (55 %) and Pt-Fe (44 %) and which led by the negative shift of half-wave potential, and details were given in Table 3, also compared with other Pt-based catalysts from recent literatures [25,27,47,48,50,[58][59][60][61][62][63][64][65]. From the ADT studies, all the three Pt-M bimetallic alloy nanoclusters are competing with the standard bench mark catalysts in terms of both activity and durability and Pt-Co was notified to have great potential compared with other combinations for cathode oxygen reduction for low temperature fuel cells.…”

Section: Resultsmentioning

confidence: 99%

Pt3M (M: Co, Ni and Fe) Bimetallic Alloy Nanoclusters as Support-Free Electrocatalysts with Improved Activity and Durability for Dioxygen Reduction in PEM Fuel Cells

et al. 2016

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Pt 3 M (M: Co, Ni and Fe) bimetallic alloy nanoclusters were synthesized by a novel and simple chemical reduction approach, and employed as the promising electrocatalyst to accelerate the kinetics of oxygen reduction reaction (ORR) for polymer electrolyte membrane fuel cells. From XRD, the positive shift of diffraction angle confirms the alloy formation between Pt and M and the elemental composition was confirmed by energy dispersive X-ray spectroscopy analysis. The nanocluster morphology and particle size was determined using scanning and transmission electron microscopy analysis. The ORR kinetic parameters for Pt-M electrocatalysts were calculated and compared with reported Pt/C catalysts. Among the Pt-M electrocatalysts, Pt-Co was found to be the most efficient catalyst having the higher mass and specific activity (at 0.9 V vs. RHE) of 0.44 mA/μg and 0.69 mA/cm 2 , respectively. The accelerated durability test reveals that the Pt-M bimetallic alloy nanoclusters retain appreciable surface area and mass activity after 8000 potential cycles confirms good long-term durability, and also competing with the reported benchmark ORR catalysts.

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Electrochemical preparation and characterization of PdPt nanocages with improved electrocatalytic activity toward oxygen reduction reaction

Cited by 30 publications

References 59 publications

Promising ternary Pt–Co–Sn catalyst for the oxygen reduction reaction

Promising ternary Pt–Co–Sn catalyst for the oxygen reduction reaction

Enhancing the Oxygen Reduction Reaction Performance by Modifying the Surface of Platinum Nanoparticles

Pt3M (M: Co, Ni and Fe) Bimetallic Alloy Nanoclusters as Support-Free Electrocatalysts with Improved Activity and Durability for Dioxygen Reduction in PEM Fuel Cells

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