3D PtAu nanoframe superstructure as a high-performance carbon-free electrocatalyst

Yoo, Sungjae; Cho, Sang Hyun; Kim, Dajeong; Ih, Seongkeun; Lee, Sung‐Woo; Zhang, Liqiu; Li, Hao; Lee, Jin Yong; Liu, Lichun; Park, Sungho

doi:10.1039/c8nr08231f

Cited by 28 publications

(27 citation statements)

References 54 publications

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“…Those (111), (200), and (220) peaks are face centered cubic and consistent with the other reported works . The ncs‐Pt showed high‐index facets (200), (210), (211), and (300) compared to other reported works . This consequently leads to higher catalytic activity due to the presence of high‐density atomic steps, ledges, and kinks .…”

Section: Resultssupporting

confidence: 89%

“…[31] The ncs-Pt showed high-index facets (200), (210), (211), and (300) compared to other reported works. [10,16,[32][33][34][35] This consequently leads to higher catalytic activity due to the presence of high-density atomic steps, Articles ledges, and kinks. [36] Moreover, at 2θ values of 38.35°and 44.46°t wo diffraction patterns appeared which can be assigned to Au (111) and Au (200), respectively; which probably occurred due to the Au coated substrate.…”

Section: Physical Characterization Of Ncs-ptsmentioning

confidence: 99%

“…Furthermore, the noble metals catalyst dispersed on carbon supported materials normally degrades the performance due to the easy corrosion and aggregation of carbon materials. [10] Therefore, the main challenges are to substantially reduce the use of Pt particles with better electrochemical MOR performances. Moreover, COlike poisoning effects can be tuned by lowering the d-band.…”

Section: Introductionmentioning

confidence: 99%

“…[12,13] Currently, the crucial challenging issues for fuel cells are cost reduction, enhanced durability, and reduced poisoning effects of the catalyst. Concerning these issues, extensive research has been performed with fascinating heterometallic surface structures such as mono-, bi-, tri-and quaternary metallic structures, [14,15] nanodendrites, [10,16] nanowiresnanorods, [17] nanotubes, [3] hollow coral, hollow cube, nanoflower, [18] core-shell structures, [19,20] tetrahedral, [21] and carbon-supported metal nanoparticles. [22] However, the design of these fascinating structures normally involves one-pot synthesis, [12] pulse electrodeposition, [23] electrochemical deposition, [24] the polyol method, and the microwave heating method.…”

Section: Introductionmentioning

confidence: 99%

“…Although Pt has the highest catalytic activity among noble metal catalysts, the use of Pt was demotivated due to the easier poisoning caused by the carbonaceous products produced during the MOR. Furthermore, the noble metals catalyst dispersed on carbon supported materials normally degrades the performance due to the easy corrosion and aggregation of carbon materials . Therefore, the main challenges are to substantially reduce the use of Pt particles with better electrochemical MOR performances.…”

Section: Introductionmentioning

confidence: 99%

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Carbon‐Free Nanocoral‐Structured Platinum Electrocatalyst for Enhanced Methanol Oxidation Reaction Activity with Superior Poison Tolerance

et al. 2020

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Poisoning from carbonaceous species and poor mass activity of catalysts are two major challenges that should be overcome for the commercial applications of direct methanol fuel cells (DMFC). In this work, superior poison-tolerant, carbon-free nanocoral-structured platinum (ncs-Pt) catalysts are successfully synthesized by using a micelle-directed method. The morphology and pore size of ncs-Pt are tailored by varying the compositional ratio of Pt in the precursor solutions and by changing the molecular ratios of different surfactant blocks. The physical properties of the ncs-Pt catalyst are observed through field emission scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and inductively coupled plasma mass spectrometry, whereas the electrochemical characteristics are analyzed through cyclic voltammetry and chronoamperometry. The developed ncs-Pt (5 mM) catalyst exhibits a high density of porous structures, high index facets, lower dband center, and a highly negative onset potential (À 0.59 V). Therefore, the developed ncs-Pt catalyst offers enhanced mass activity 6.56 mA/μg and superior poison tolerance 5.62 for the methanol oxidation reaction.[a] S.

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Section: Resultssupporting

confidence: 89%

Section: Physical Characterization Of Ncs-ptsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Carbon‐Free Nanocoral‐Structured Platinum Electrocatalyst for Enhanced Methanol Oxidation Reaction Activity with Superior Poison Tolerance

et al. 2020

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Catalytic Nanoframes and Beyond

2020

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The ever‐increasing need for the production and expenditure of sustainable energy is a result of the astonishing rate of consumption of fossil fuels and the accompanying environmental problems. Emphasis is being directed to the generation of sustainable energy by the fuel cell and water splitting technologies. Accordingly, the development of highly efficient electrocatalysts has attracted significant interest, as the fuel cell and water splitting technologies are critically dependent on their performance. Among numerous catalyst designs under investigation, nanoframe catalysts have an intrinsically large surface area per volume and a tunable composition, which impacts the number of catalytically active sites and their intrinsic catalytic activity, respectively. Nevertheless, the structural integrity of the nanoframe during electrochemical operation is an ongoing concern. Some significant advances in the field of nanoframe catalysts have been recently accomplished, specifically geared to resolving the catalytic stability concerns and significantly boosting the intrinsic catalytic activity of the active sites. Herein, general synthetic concepts of nanoframe structures and their structure‐dependent catalytic performance are summarized, along with recent notable advances in this field. A discussion on the remaining challenges and future directions, addressing the limitations of nanoframe catalysts, are also provided.

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Well‐Defined Nanostructures for Electrochemical Energy Conversion and Storage

Adekoya

et al. 2020

Advanced Energy Materials

141

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existing energy supply systems mainly based on fossil fuels, the performance of the clean energy (conversion and storage) devices/systems has to be significantly improved. The electrochemical energy conversion and storage usually involves many intricate chemical reactions and physical interactions at the surface and inside of electrodes/electrolytes, and the kinetics and transport behaviors of different carriers (e.g., electrons, holes, ions, molecules) are closely associated with the materials selected for electrodes as well as the structures of electrodes. To this point, material design and structure design for electrodes have been the research focuses for improving the electrochemical performance of energy conversion and storage, which both have gained high attention from academia and industry.Along with researches for finding advanced electrode materials, much recent research efforts have been made for electrode structure design and engineering, especially when traditional macro-scale structured electrodes are showing limitations of achieving satisfying performance for energy conversion and storage. Among these efforts, electrode nanostructuring has been demonstrated as a promising way for realizing highperformance electrochemical energy conversion and storage, which attributes the distinct features of nanostructured materials differing from their bulk material counterparts. The high surface-to-volume ratios of nanostructures give large electrochemical surface areas with much more exposed atoms and hence improve the performance per unit electrode area and/or Electrochemical energy conversion and storage play crucial roles in meeting the increasing demand for renewable, portable, and affordable power supplies for society. The rapid development of nanostructured materials provides an alternative route by virtue of their unique and promising effects emerging at nanoscale. In addition to finding advanced materials, structure design and engineering of electrodes improves the electrochemical performance and the resultant commercial competitivity. Regarding the structural engineering, controlling the geometrical parameters (i.e., size, shape, heteroarchitecture, and spatial arrangement) of nanostructures and thus forming well-defined nanostructure (WDN) electrodes have been the central aspects of investigations and practical applications. This review discusses the fundamental aspects and concept of WDNs for energy conversion and storage, with a strong emphasis on illuminating the relationship between the structural characteristics and the resultant electrochemical superiorities. Key strategies for actualizing well-defined features in nanostructures are summarized. Electrocatalysis and photoelectrocatalysis (for energy conversion) as well as metal-ion batteries and supercapacitors (for energy storage) are selected to illustrate the superiorities of WDNs in electrochemical reactions and charge carrier transportation. Finally, conclusions and perspectives regarding future research, development, and applications of WDNs...

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3D PtAu nanoframe superstructure as a high-performance carbon-free electrocatalyst

Abstract: The demonstrated strategy is useful for constructing high-performance catalytic superstructures using nanoframes as building blocks, leading to the carbon-free Pt nanoparticle catalysts.

Cited by 28 publications

References 54 publications

Carbon‐Free Nanocoral‐Structured Platinum Electrocatalyst for Enhanced Methanol Oxidation Reaction Activity with Superior Poison Tolerance

Carbon‐Free Nanocoral‐Structured Platinum Electrocatalyst for Enhanced Methanol Oxidation Reaction Activity with Superior Poison Tolerance

Catalytic Nanoframes and Beyond

Well‐Defined Nanostructures for Electrochemical Energy Conversion and Storage

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