Vertex‐Reinforced PtCuCo Ternary Nanoframes as Efficient and Stable Electrocatalysts for the Oxygen Reduction Reaction and the Methanol Oxidation Reaction

Kwon, Taehyun; Jun, Minki; Kim, Ho Young; Oh, Aram; Park, Jongsik; Baik, Hionsuck; Joo, Sang Hoon; Lee, Kwangyeol

doi:10.1002/adfm.201706440

Cited by 166 publications

(116 citation statements)

References 58 publications

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“…The deconvolution analysis of the 4f 7/2 peak reveals the presence of two valence states at 72.1 ± 0.2 and 71.2 ± 0.2 eV associated with Pt(2+) and Pt(0) valences, respectively. [32,33] Based on the XPS data, we speculate that the Pt and Cu atoms tend to donate electrons to W atoms. [31] The Pt(0)/Pt(2+) ratio in Pt 2 CuW 0.25 is calculated to be 5/2, which means that the dominating Pt atoms are in metallic state.…”

Section: Resultsmentioning

confidence: 99%

Tungsten as “Adhesive” in Pt₂CuW_0.25 Ternary Alloy for Highly Durable Oxygen Reduction Electrocatalysis

Luo

Chen

et al. 2019

Adv Funct Materials

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Pt-based alloy nanocrystals have shown great success in oxygen reduction electrocatalysis owing to their unique surface and electronic structures. However, they suffer from severe stability issues due to the dissolution of non-noble metal elements, leading to the "trade-off " between activity and stability. In this work, targeting the stability issue of a Pt x Cu y -based alloy, Pt 2 CuW 0.25 ternary alloy nanoparticles are synthesized by thermal reduction strategy based on wet-chemical method using W(CO) 6 as a reductant. Apart from the competitive activity, the obtained Pt 2 CuW 0.25 /C shows remarkable stability, whereby the area specific activity and mass activity maintain 89.5% and 95.9% of the initial values, respectively, after 30 000 cycles of accelerated polarization between 0.6 and 1.1 V (vs reversible hydrogen electrode). By using vacancy formation energy of surface Pt as the descriptor, it is found that the enhanced stability of Pt 2 CuW 0.25 /C originates mainly from the stronger bonding between W and Pt/Cu atoms, acting as an "adhesive" to stabilize the atoms from dissolution, which is further verified by chemical stability experiments. This work demonstrates a rational design strategy for ternary alloy nano-electrocatalyst that has high thermodynamic stability while maintaining high activity by employing high-melting-point metal.

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Section: Resultsmentioning

confidence: 99%

Tungsten as “Adhesive” in Pt₂CuW_0.25 Ternary Alloy for Highly Durable Oxygen Reduction Electrocatalysis

Luo

Chen

et al. 2019

Adv Funct Materials

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“…The electrocatalytic oxidation of methanol has been widely studied for the construction of direct methanol fuel cells [11,54,55]. During the past decade, Pt has been commonly employed as a catalytic material for the electrooxidation of methanol [56,57,58].…”

Section: Resultsmentioning

confidence: 99%

Low-Temperature Vapor-Phase Synthesis of Single-Crystalline Gold Nanostructures: Toward Exceptional Electrocatalytic Activity for Methanol Oxidation Reaction

et al. 2019

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Au nanostructures (Au NSs) have been considered promising materials for applications in fuel cell catalysis, electrochemistry, and plasmonics. For the fabrication of high-performance Au NS-based electronic or electrochemical devices, Au NSs should have clean surfaces and be directly supported on a substrate without any mediating molecules. Herein, we report the vapor-phase synthesis of Au NSs on a fluorine-doped tin oxide (FTO) substrate at 120 °C and their application to the electrocatalytic methanol oxidation reaction (MOR). By employing AuCl as a precursor, the synthesis temperature for Au NSs was reduced to under 200 °C, enabling the direct synthesis of Au NSs on an FTO substrate in the vapor phase. Considering that previously reported vapor-phase synthesis of Au NSs requires a high temperature over 1000 °C, this proposed synthetic method is remarkably simple and practical. Moreover, we could selectively synthesize Au nanoparticles (NPs) and nanoplates by adjusting the location of the substrate, and the size of the Au NPs was controllable by changing the reaction temperature. The synthesized Au NSs are a single-crystalline material with clean surfaces that achieved a high methanol oxidation current density of 14.65 mA/cm2 when intimately supported by an FTO substrate. We anticipate that this novel synthetic method can widen the applicability of vapor-phase synthesized Au NSs for electronic and electrochemical devices.

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“… Illustration of the formation process of Cu@PtCu rhombic dodecahedral nanocrystals, PtCu rhombic dodecahedral nanoframes, Co‐doped Cu@PtCu rhombic dodecahedral nanocrystals, and Co‐doped PtCu rhombic dodecahedral nanoframes (reprinted with permission from Ref. , Copyright 2017 Wiley‐VCH).…”

Section: Three‐dimensional Nanostructuresmentioning

confidence: 99%

“…Despite the abovementioned advantages, it was pointed out that nanodendrites (NDs) with high surface area are not robust . The decay of mass activity during the oxidation process strongly hinders the improvement in the catalytic performance of the nanocrystals.…”

Section: Three‐dimensional Nanostructuresmentioning

confidence: 99%

Recent Achievements in Noble Metal Catalysts with Unique Nanostructures for Liquid Fuel Cells

Sun

2020

ChemSusChem

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In recent years, research efforts have been focused on the design and fabrication of highly efficient catalysts for liquid fuel cells, because the use of these cells is an important approach for alleviating environmental pollution and energy crises. However, the limitations of the catalytic performance of industrial Pt/C have strongly hindered the development of these fuel cells. The catalyst morphology has a strong impact on its performance; nanostructured catalysts are preferred as they offer large specific surface area and more exposed active centers. In view of this, many catalysts with unique structures have been synthesized in recent years, all of which show excellent catalytic performance characteristics. Despite these achievements, few efforts have been made to survey this field comprehensively. Herein, the recent advances in catalysts for liquid fuel cells are summarized, with a focus on noble metal catalysts with unique morphologies such as nanowires, nanosheets, and assembly structures. Their formation mechanisms are discussed critically. The relationship between the unique morphologies and excellent performance of these catalysts is also explored. This work may provide guidelines for the further development of liquid fuel cells.

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Vertex‐Reinforced PtCuCo Ternary Nanoframes as Efficient and Stable Electrocatalysts for the Oxygen Reduction Reaction and the Methanol Oxidation Reaction

Cited by 166 publications

References 58 publications

Tungsten as “Adhesive” in Pt₂CuW_0.25 Ternary Alloy for Highly Durable Oxygen Reduction Electrocatalysis

Tungsten as “Adhesive” in Pt₂CuW_0.25 Ternary Alloy for Highly Durable Oxygen Reduction Electrocatalysis

Low-Temperature Vapor-Phase Synthesis of Single-Crystalline Gold Nanostructures: Toward Exceptional Electrocatalytic Activity for Methanol Oxidation Reaction

Recent Achievements in Noble Metal Catalysts with Unique Nanostructures for Liquid Fuel Cells

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Vertex‐Reinforced PtCuCo Ternary Nanoframes as Efficient and Stable Electrocatalysts for the Oxygen Reduction Reaction and the Methanol Oxidation Reaction

Cited by 166 publications

References 58 publications

Tungsten as “Adhesive” in Pt2CuW0.25 Ternary Alloy for Highly Durable Oxygen Reduction Electrocatalysis

Tungsten as “Adhesive” in Pt2CuW0.25 Ternary Alloy for Highly Durable Oxygen Reduction Electrocatalysis

Low-Temperature Vapor-Phase Synthesis of Single-Crystalline Gold Nanostructures: Toward Exceptional Electrocatalytic Activity for Methanol Oxidation Reaction

Recent Achievements in Noble Metal Catalysts with Unique Nanostructures for Liquid Fuel Cells

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Tungsten as “Adhesive” in Pt₂CuW_0.25 Ternary Alloy for Highly Durable Oxygen Reduction Electrocatalysis

Tungsten as “Adhesive” in Pt₂CuW_0.25 Ternary Alloy for Highly Durable Oxygen Reduction Electrocatalysis