Fabrication of bimetallic PtPd alloy nanospheres supported on rGO sheets for superior methanol electro-oxidation

Esabattina, Sunanda; Posa, Venkata Ramana; Zhang, Hong; Godlaveeti, Sreenivasa Kumar; Reddy, Rammanohar Reddy Nagi; Somala, Adinarayana Reddy

doi:10.1016/j.ijhydene.2017.07.193

Cited by 38 publications

(9 citation statements)

References 49 publications

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“…On the whole selected area, both Pt and Ag elements are well dispersed, together with the overlapping element mapping of Pt and Ag, proving that intermetallic alloyed PtAg NFs are successfully formed (Figure f). In Figure a and b, the petal-structured PtAg NFs are expanding, just like blooming flowers, and the crevices between nanopetals are wider where the lattice distance is 0.224 nm (Figure c), which indicates the formation of a more petal-open structure and increase of exposed active areas, thus improving utilization of noble metal Pt. , NG, acting as a suitable catalyst support with unique multilayered structures (Figure S2), provides large support areas and improves conductivity, which can assist in the electrocatalytic and mass-transfer reactions in DFCs. , Herein, from Figure d and e, the as-prepared G-A PtAg/NG catalysts are more dispersive. In addition, in Figure f, additional blooming petal-like structures and greater spacing between petals can also be seen.…”

Section: Resultsmentioning

confidence: 85%

“…34,35 NG, acting as a suitable catalyst support with unique multilayered structures (Figure S2), provides large support areas and improves conductivity, which can assist in the electrocatalytic and mass-transfer reactions in DFCs. 36,37 Herein, from Figure 2d and e, the as-prepared G-A PtAg/ NG catalysts are more dispersive. In addition, in Figure 2f, additional blooming petal-like structures and greater spacing between petals can also be seen.…”

Section: ■ Results and Discussionmentioning

confidence: 94%

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Glycine-Assisted Fabrication of N-Doped Graphene-Supported Uniform Multipetal PtAg Nanoflowers for Enhanced Ethanol and Ethylene Glycol Oxidation

Zhang

Gao

Song

et al. 2019

ACS Sustainable Chem. Eng.

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The pursuit of efficient electrocatalysts with better activity, stability, and controllable morphology and size for alcohol oxidation is of decisive significance yet challenging for the application of direct alcohol fuel cells (DAFCs) in large scale. Herein, a series of glycine-assisted N-doped graphene (NG)-supported multipetal PtAg nanoflowers (NFs) has been successfully engineered to serve as high-performance electrocatalysts for ethanol electrooxidation and ethylene glycol electrooxidation catalysis. The introduction of glycine and NG played important roles on the size evolution, where the size decreased by around 7 nm, and well dispersion of PtAg NFs, respectively, which assisted in the formation of PtAg nanoparticles with high surface areas and optimized multipetal structure. The multipetal PtAg NFs exhibit great improvement in electrochemical activity and durability toward the ethanol oxidation reaction (EOR) and ethylene glycol oxidation reaction (EGOR), whose mass activities are 3598.4 and 4587.2 mA mg −1 , respectively. Meanwhile, with the promoting impact of glycine and NG, the as-obtained PtAg NFs can even retain 49.8% and 41.2% of the initial catalytic activity for EOR and EGOR after 500 cycles. This work suggests that PtAg NFs with superior electrochemical activity and stability are one of the optimized choices for high-performance catalysts toward alcohol oxidation.

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Section: Resultsmentioning

confidence: 85%

Section: ■ Results and Discussionmentioning

confidence: 94%

Glycine-Assisted Fabrication of N-Doped Graphene-Supported Uniform Multipetal PtAg Nanoflowers for Enhanced Ethanol and Ethylene Glycol Oxidation

Zhang

Gao

Song

et al. 2019

ACS Sustainable Chem. Eng.

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“… 21 Remarkably, Pd/Pt nanospheres supported on reduced graphene oxide (rGO-PtPd) exhibit a higher surface than Pt/C black (1.68:1), resulting in a greater specific activity of 0.54 versus 0.32 mA cm –2 . 22 …”

Section: Introductionmentioning

confidence: 99%

“…Also, Pd/Pt nanocrystals supported on ionic polymer functionalized graphene exhibit improved ORR activity (specific activity: 1.89 mA cm –2 at 0.9 V RHE ) and greater durability with respect to commercial Pt/C (specific activity: 0.23 mA cm –2 at 0.9 V RHE ) . Remarkably, Pd/Pt nanospheres supported on reduced graphene oxide (rGO-PtPd) exhibit a higher surface than Pt/C black (1.68:1), resulting in a greater specific activity of 0.54 versus 0.32 mA cm –2 …”

Section: Introductionmentioning

confidence: 99%

Hierarchical Porous Carbon-PtPd Catalysts and Their Activity toward Oxygen Reduction Reaction

et al. 2022

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PtPd bimetallic catalysts supported on hierarchical porous carbon (HPC) with different porous sizes were developed for the oxygen reduction reaction (ORR) toward fuel cell applications. The HPC pore size was controlled by using SiO 2 nanoparticles as a template with different sizes, 287, 371, and 425 nm, to obtain three HPC materials denoted as HPC-1, HPC-2, and HPC-3, respectively. PtPd/HPC catalysts were characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and high-resolution transmission electron microscopy. The electrochemical performance was examined by cyclic voltammetry and linear sweep voltammetry. PtPd/HPC-2 turned out to be the most optimal catalyst with an electroactive surface area (ESA) of 40.2 m 2 g –1 and a current density for ORR of −1285 A g –1 at 2 mV s –1 and 1600 rpm. In addition, we conducted a density functional theory computational study to examine the interactions between a PtPd cluster and a graphitic domain of HPC, as well as the interaction between the catalyst and the oxygen molecule. These results reveal the strong influence of the porous size (in HPC) and ESA values (in PtPd nanoparticles) in the mass transport process which rules the electrochemical performance.

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“…In the electrochemical tests, the PtPd catalysts on rGO have presented high MOR activities than homemade Pt/rGO, Pd/rGO, and commercial Pt/C catalysts. The high electrochemical performance of the synthesized catalysts was attributed to its large electrochemical surface area, ultrafine particles size, and synergetic effect between the alloyed metals. , Chen et al have reported nanoflower-like Pd@Pt supported on graphene, which showed higher performance than PdPt nanofoams for MOR . Similarly, Tan et al reported Au@Pd core–shell nanoparticles of higher MOR catalytic activity than Au free Pd nanoparticles .…”

Section: Introductionmentioning

confidence: 99%

Zinc-Coordination Polymer-Derived Porous Carbon-Supported Stable PtM Electrocatalysts for Methanol Oxidation Reaction

et al. 2021

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Porous carbon (PC) is obtained by carbonizing a zinc-coordination polymer (MOF-5) at 950 °C and PtM (M = Fe, Co, Ni, Cu, Zn) nanoparticles (NPs), which are deposited on PC using the polyol method. Structural and morphological characterizations of the synthesized materials are carried out by powder X-ray diffraction (PXRD), X-ray photoelectron spectroscopy (XPS), and high-resolution transmission electron microscopy (HRTEM), and the porosity was determined using a N 2 adsorption/desorption technique. The results revealed that PtM NPs are alloyed in the fcc phase and are well dispersed on the surface of PC. The electrochemical results show that PtM/PC 950 catalysts have higher methanol oxidation reaction (MOR) performances than commercial Pt/C (20%) catalysts. After 3000 s of chronoamperometry (CA) test, the MOR performances decreased in the order of Pt 1 Cu 1 /PC 950 > Pt 1 Ni 1 /PC 950 > Pt 1 Fe 1 /PC 950 > Pt 1 Zn 1 /PC 950 > Pt 1 Co 1 /PC 950. The high MOR activities of the synthesized catalysts are attributed to the effect of M on methanol dissociative chemisorption and improved tolerance of Pt against CO poisoning. The high specific surface area and porosity of the carbon support have an additional effect in boosting the MOR activities. Screening of the first row transition metals ( d 5+ n , n = 1, 2, 3, 4, 5) alloyed with Pt binary catalysts for MOR shows that Pt with d 8 (Ni) and d 9 (Cu) transition metals, in equivalent atomic ratios, are good anode catalysts for alcohol fuel cells.

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Fabrication of bimetallic PtPd alloy nanospheres supported on rGO sheets for superior methanol electro-oxidation

Cited by 38 publications

References 49 publications

Glycine-Assisted Fabrication of N-Doped Graphene-Supported Uniform Multipetal PtAg Nanoflowers for Enhanced Ethanol and Ethylene Glycol Oxidation

Glycine-Assisted Fabrication of N-Doped Graphene-Supported Uniform Multipetal PtAg Nanoflowers for Enhanced Ethanol and Ethylene Glycol Oxidation

Hierarchical Porous Carbon-PtPd Catalysts and Their Activity toward Oxygen Reduction Reaction

Zinc-Coordination Polymer-Derived Porous Carbon-Supported Stable PtM Electrocatalysts for Methanol Oxidation Reaction

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