Surfactant-free room temperature synthesis of PdxPty/C assisted by ultra-sonication as highly active and stable catalysts for formic acid oxidation

Song, Jili; Xiao, Zhuojie; Jiang, Yangcheng; Abdelhafiz, Ali; Chang, Ikwhang; Zeng, Jianhuang

doi:10.1016/j.ijhydene.2019.03.169

Cited by 18 publications

(9 citation statements)

References 56 publications

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“…compressive or tensile) is dictated by the lattice mismatch and crystal structure from under-lying metal support. [14][15][16][17] Pt monolayer supported on Au (111) substrate experienced an increase of Pt-Pt bond distance, indicating presence of tensile strain induced from Au support. On the other hand, Pt monolayer supported on Ir (111) experineced compressive strain as Pt-Pt bond distance was shortened.…”

Section: Introductionmentioning

confidence: 99%

“…Different metals act catalyst supports induce mechanical strain on atomic‐thick Pt adatoms. Strain magnitude and sign (i.e., compressive or tensile) is dictated by the lattice mismatch and crystal structure from underlying metal support . Pt monolayer supported on Au (111) substrate experienced an increase of PtPt bond distance, indicating presence of tensile strain induced from Au support.…”

Section: Introductionmentioning

confidence: 99%

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Contiguous and Atomically Thin Pt Film with Supra‐Bulk Behavior Through Graphene‐Imposed Epitaxy

Choi

Abdelhafiz

Buntin

et al. 2019

Adv Funct Materials

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We investigate the stable atomic configuration and the nature of chemical bonding in epitaxial Pt films on graphene. Graphene-templated monolayer to few-multilayers of Pt, synthesized as contiguous 2D films by room temperature electrochemical methods, is shown both experimentally and computationally to exhibit stable {100} structure in the 1-2 layer range. The fundamental question being investigated is whether surface Pt atoms rendered in these 2D architectures are as stable as those of their counterparts in bulk Pt. Unsurprisingly, a single layer Pt on the graphene (Pt_1ML/GR) shows much higher Pt dissociation energy of (-7.51 eV) than that of an isolated Pt atom on graphene. However, the dissociation energy from Pt_1ML/GR shows rather similar energy to that of a Pt(100) surface,-7.77 eV, while in bi-layer Pt on the graphene (Pt_2ML/GR), this energy decreases to-8.63 eV due to the stronger Pt binding, surpassing its bulk counterpart. At Pt_2ML/GR, the dissociation This article is protected by copyright. All rights reserved. 2 energy also slightly surpasses that of bulk Pt(111). Bulk-like stability of atomically-thin Pt-graphene is possible through a combination of inter-planar Pt-C covalent bonding and inter/intra-planar metallic bonding. This unprecedented stability is also accompanied by a metal-like presence of electronic states at the Fermi level. Such atomically-thin metal-graphene architectures can be a new stable platform for synthesizing 2D metallic films with various applications in catalysis, sensing and electronics.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Contiguous and Atomically Thin Pt Film with Supra‐Bulk Behavior Through Graphene‐Imposed Epitaxy

Choi

Abdelhafiz

Buntin

et al. 2019

Adv Funct Materials

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“…Reactions at both the anode and cathode, especially the oxygen reduction reaction (ORR) at the cathode, has sluggish kinetics, which has triggered extensive research to improve ORR activity and lower cost of electrocatalysts in the past decade 3 . One desirable protocol to reduce the amount of Pt required and address the performance challenge is to alloy Pt with transition metals (e.g., Ni, Co, Fe, Cu, and so forth) [4][5][6][7][8][9][10][11][12][13] . Early studies came up with various key factors that determine the ORR activity of Pt-based electrocatalysts, including, but not limited to, the geometric structure 14 , the electronic structure 15,16 and the adsorption energy of oxygenated species on the surface Pt atoms 17 .…”

Section: Introductionmentioning

confidence: 99%

De-alloyed PtCu/C catalysts with enhanced electrocatalytic performance for the oxygen reduction reaction

Xiao

Zhong

et al. 2021

Nanoscale

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“…In the development of electrocatalysts for FAO, Pt- and Pd-based catalysts have been investigated intensively. − However, Pd-based catalysts suffer from degradation of activity over long periods due to the dissolution of Pd in acid solutions; meanwhile Pt-based ones need more improvement in activity for practical applications. In enhancing FAO catalytic performances, a general way is to modify Pt or Pd metals by alloying with other metals such as Ni, Au, Bi, Pb, As, and Sb − or by attaching other metals on their surfaces. − Most of the modified catalysts have been reported to enhance FAO in comparison to pure Pt and Pd metals.…”

Section: Introductionmentioning

confidence: 99%

Pt Deposits on Bi/Pt NP Catalyst for Formic Acid Oxidation: Catalytic Enhancement and Longer Lifetime

2020

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This work presents an improvement in the activity and catalytic lifetime of Pt deposits on Bi-modified Pt nanoparticles (Bi/Pt NP) toward formic acid oxidation (FAO). Using an irreversible adsorption method, Bi was deposited on Pt NP to form Bi/Pt NP and sequentially Pt was deposited on Bi/Pt NP to form Pt/Bi/Pt NP. Voltammetric studies of Pt NP, Bi/Pt NP, and Pt/Bi/Pt NPs supported that Pt deposits of Pt/Bi/Pt NPs provided quite a unique behavior: simultaneous surface oxidation of deposited Pt and Bi and significant resistance to the oxidative removal of Bi. Furthermore, combined spectroscopic investigations revealed that the concentration of the employed Pt precursor ion solution determined the amount of deposited Pt from ∼0.2 to ∼0.4 in coverage. The best Pt/Bi/Pt NP catalyst with a Pt coverage of ∼0.25 enhanced the dehydrogenation processes below ∼0.4 V by a factor of more than 2 and increased the FAO current at ∼0.8 V roughly by 15 times, referring to those of Bi/Pt NP. The lifetime measurement works revealed that after the 1000th voltammetric cycle to 0.4 V, the FAO currents of Pt/Bi/Pt NPs were 2 and 4 times higher than those of Bi/Pt NP and Pt NP, respectively. The Pt deposits on Bi/Pt NP were concluded to play two roles in FAO: the promotion of FAO processes to increase the activity and the retardation of Bi oxidative removal to maintain the activity much longer.

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Surfactant-free room temperature synthesis of PdxPty/C assisted by ultra-sonication as highly active and stable catalysts for formic acid oxidation

Cited by 18 publications

References 56 publications

Contiguous and Atomically Thin Pt Film with Supra‐Bulk Behavior Through Graphene‐Imposed Epitaxy

Contiguous and Atomically Thin Pt Film with Supra‐Bulk Behavior Through Graphene‐Imposed Epitaxy

De-alloyed PtCu/C catalysts with enhanced electrocatalytic performance for the oxygen reduction reaction

Pt Deposits on Bi/Pt NP Catalyst for Formic Acid Oxidation: Catalytic Enhancement and Longer Lifetime

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