Cu@Pt catalysts prepared by galvanic replacement of polyhedral copper nanoparticles for polymer electrolyte membrane fuel cells

Wu, Mei; Wu, Xin; Zhang, Lei; Abdelhafiz, Ali; Chang, Ikwhang; Qu, Chong; Jiang, Yangcheng; Zeng, Jianhuang; Alamgir, Faisal M.

doi:10.1016/j.electacta.2019.03.111

Cited by 34 publications

(26 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The morphological study of CuO, NiO, and its hybrid was carried out by scanning electron microscopy. Micrographs showed that the NPs of CuO and NiO are non-spherical polyhedral-shaped and polydispersed in reaction medium [55,56]. The morphological feature of hybrid shows a smooth surface, spherical shape, and small sized particles as shown in Figure 6 [49].…”

Section: Morphological Sem and Tem Analysismentioning

confidence: 96%

Curcuma longa Mediated Synthesis of Copper Oxide, Nickel Oxide and Cu-Ni Bimetallic Hybrid Nanoparticles: Characterization and Evaluation for Antimicrobial, Anti-Parasitic and Cytotoxic Potentials

et al. 2021

View full text Add to dashboard Cite

Nanoparticles have long been known and their biomedical potent activities have proven that these can provide an alternative to other drugs. In the current study, copper oxide, nickel oxide and copper/nickel hybrid NPs were biosynthesized by using Curcuma longa root extracts as a reducing and capping agent, followed by characterization via UV-spectroscopy, Fourier transformed infrared spectroscopy (FTIR), energy dispersive X-ray (EDX), powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermo galvanometric analysis (TGA), and band gap. FTIR spectroscopy shows the availability of various functional groups and biomolecules such as carbohydrate, protein, polysaccharides, etc. The EDX peak confirmed that the elemental nickel and copper were present in large quantity in the analyzed sample. Scanning electron micrographs showed that the synthesized CuO-NPs and NiO-NPs were polyhedral uniform and homogeneous in morphology, while the copper/nickel hybrid NPs were well dispersed, spherical in shape, and uniform in size. TEM micrographs of CuO-NPs had 27.72 nm, NiO had 23.13 nm and, for their hybrid, the size was 17.38 nm, which was confirmed respectively. The CuO and NiO NPs possessed spherical- to multi-headed shapes, while their hybrid showed a complete spherical shape, small size, and polydispersed NPs. The XRD spectra revealed that the average particle size for CuO, NiO, and hybrid were 29.7 nm, 28 nm and 27 nm, respectively. Maximum anti-diabetic inhibition of (52.35 ± 0.76: CuO-NPs, 68.1 ± 0.93: NiO-NPs and 74.23 ± 0.42: Cu + Ni hybrids) for α-amylase and (39.25 ± 0.18 CuO-NPs, 52.35 ± 1.32: NiO-NPs and 62.32 ± 0.48: Cu + Ni hybrids) for α-glucosidase were calculated, respectively, at 400 µg/mL. The maximum antioxidants capacity was observed as 65.1 ± 0.83 μgAAE/mg for Cu-Ni hybrids, 58.39 ± 0.62 μgAAE/mg for NiO-NPs, and 52.2 ± 0.31 μgAAE/mg for CuO-NPs, respectively, at 400 μg/mL. The highest antibacterial activity of biosynthesized NPs was observed against P. aeuroginosa (28 ± 1.22) and P. vulgaris (25 ± 1.73) for Cu + Ni hybrids, respectively. Furthermore, the antibiotics were coated with NPs, and activity was noted. Significant anti-leishmanial activity of 60.5 ± 0.53 and 68.4 ± 0.59 for Cu + Ni hybrids; 53.2 ± 0.48 and 61.2 ± 0.44 for NiO-NPs; 49.1 ± 0.39 and 56.2 ± 0.45 for CuO-NPs at 400 μg/mL were recorded for promastigote and amastigotes, respectively. The biosynthesized NPs also showed significant anti-cancerous potential against HepG2 cell lines. It was concluded from the study that NPs are potential agents to be used as an alternative to antimicrobial agents.

show abstract

Section: Morphological Sem and Tem Analysismentioning

confidence: 96%

Curcuma longa Mediated Synthesis of Copper Oxide, Nickel Oxide and Cu-Ni Bimetallic Hybrid Nanoparticles: Characterization and Evaluation for Antimicrobial, Anti-Parasitic and Cytotoxic Potentials

et al. 2021

View full text Add to dashboard Cite

show abstract

“…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%

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

Choi

Abdelhafiz

Buntin

et al. 2019

Adv Funct Materials

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…A material with a low reduction potential is used as a sacrificial template and is reacted with the desired metal ions to create a spontaneous substitution reaction. Metals such as Ag, [ 126 ] Fe, [ 127 ] Co, [ 128 ] Cu, [ 129 ] and Pd, [ 84 ] as well as semimetals such as Se [ 130 ] and Te, [ 31 ] have been used as sacrificial templates for the synthesis of Pt nanostructures. Recently, metal oxides such as Cu 2 O and Mn 3 O 4 have also been used in substitution reactions.…”

Section: D Architecture Materials: First Steps Toward the Fabricatiomentioning

confidence: 99%

Synergetic Structural Transformation of Pt Electrocatalyst into Advanced 3D Architectures for Hydrogen Fuel Cells

Kim

et al. 2020

Advanced Materials

View full text Add to dashboard Cite

oxidizing agent (oxygen). [4,5] Fuel cells are considered likely by many to play a central and integral role in future renewable energy developments. However, reducing their cost has been a significant challenge, and is critical for promoting future studies and accelerating market growth. [6-8] Currently, noble Pt materials are the most favored electrocatalysts for the electrochemical reactions at both the anode and cathode in fuel cells. The cathodic oxygen reduction reaction (ORR) rate is substantially slower than the anodic hydrogen oxidation reaction by several orders of magnitude. When properly tailored in electrodes, Pt materials provide fast reaction kinetics, good electrical conductivity, and high chemical stability in strongly acidic electrolytes. [9-11] Conventional electrocatalyst structures generally employ fine Pt powders (2-3 nm) supported on high surface area carbon (Pt/C). However, as the number of large scale energy applications continues to increase, the high required Pt loading (typically ≈0.5 mg cm −2 for commercial electrodes) and high cost of this precious metal (≈$1000 per troy ounce) pose significant barriers to the widespread use of fuel cells containing Pt materials. The quantity of Pt required to achieve the targeted electrode performance significantly contributes to the high cost of fuel cell systems. [12-14] In recent decades, significant efforts have been devoted to investigating the principles underlying the electrocatalyst layer, A new direction for developing electrocatalysts for hydrogen fuel cell systems has emerged, based on the fabrication of 3D architectures. These new architectures include extended Pt surface building blocks, the strategic use of void spaces, and deliberate network connectivity along with tortuosity, as design components. Various strategies for synthesis now enable the functional and structural engineering of these electrocatalysts with appropriate electronic, ionic, and electrochemical features. The new architectures provide efficient mass transport and large electrochemically active areas. To date, although there are few examples of fully functioning hydrogen fuel cell devices, these 3D electrocatalysts have the potential to achieve optimal cell performance and durability, exceeding conventional Pt powder (i.e., Pt/C) electrocatalysts. This progress report highlights the various 3D architectures proposed for Pt electrocatalysts, advances made in the fabrication of these structures, and the remaining technical challenges. Attempts to develop design rules for 3D architectures and modeling, provide insights into their achievable and potential performance. Perspectives on future developments of new multiscale designs are also discussed along with future study directions.

show abstract

Cu@Pt catalysts prepared by galvanic replacement of polyhedral copper nanoparticles for polymer electrolyte membrane fuel cells

Cited by 34 publications

References 49 publications

Curcuma longa Mediated Synthesis of Copper Oxide, Nickel Oxide and Cu-Ni Bimetallic Hybrid Nanoparticles: Characterization and Evaluation for Antimicrobial, Anti-Parasitic and Cytotoxic Potentials

Curcuma longa Mediated Synthesis of Copper Oxide, Nickel Oxide and Cu-Ni Bimetallic Hybrid Nanoparticles: Characterization and Evaluation for Antimicrobial, Anti-Parasitic and Cytotoxic Potentials

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

Synergetic Structural Transformation of Pt Electrocatalyst into Advanced 3D Architectures for Hydrogen Fuel Cells

Contact Info

Product

Resources

About