One‐Pot Synthesis of Highly Anisotropic Five‐Fold‐Twinned PtCu Nanoframes Used as a Bifunctional Electrocatalyst for Oxygen Reduction and Methanol Oxidation

Zhang, Zhicheng; Luo, Zhimin; Chen, Bin; Wei, Chao; Zhao, Jian; Chen, Junze; Zhang, Xiao; Lai, Zhuangchai; Fan, Zhanxi; Tan, Chaoliang; Zhao, Meiting; Lu, Qipeng; Li, Bing; Zong, Yun; Yan, Cairong; Wang, Guoxiong; Xu, Zhichuan J.; Zhang, Hua

doi:10.1002/adma.201603075

Cited by 348 publications

(262 citation statements)

References 55 publications

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“…Bimetallic systems with synergistic effects that are tunable through variations of composition and structure have many potential applications in the methanol oxidation reaction (MOR) 29–31 . To enhance the mass activity of Pt-based catalysts, one of the most typical strategies is to incorporate non-Pt (M) metals into the Pt nanoparticles (NPs) by alloying technology or by using core-shell composite bimetallic nanostructures 32–40 .…”

Section: Introductionmentioning

confidence: 99%

A self-supporting bimetallic Au@Pt core-shell nanoparticle electrocatalyst for the synergistic enhancement of methanol oxidation

Tan

Sun

Zheng

et al. 2017

Sci Rep

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The morphology of Pt−Au bimetal nanostructures plays an important role in enhancing the catalytic capability, catalytic stability and utilization efficiency of the platinum. We designed and successfully prepared Au@Pt nanoparticles (NPs) through an economical, surfactant-free and efficient method of seed-mediated growth. The Au@Pt NPs displayed electrochemical performances superior to those of commercial Pt/C catalysts because their agglomeration was prevented and exhibited better long-term stability with respect to methanol oxidation in acidic media by efficiently removing intermediates. Among the obtained Au@Pt NPs, Au90@Pt10 NPs exhibited the most significantly enhanced catalytic performance for the methanol oxidation reaction (MOR). Their mass and electrochemically active surface area (ECSA)-normalized current densities are approximately 3.9 and 4.6 times higher than those of commercial Pt/C catalysts, respectively. The oxidation current densities of the Au90@Pt10 NPs are approximately 1.8 times higher than those of commercial Pt/C catalysts after 4000 s of continuous measurement because the small Pt NPs grown on the surface of the Au90@Pt10 NPs were effectively stabilized by the Au metal support. This approach may be a facile method for the synthesis of self-supported bimetallic nanostructures, which is of great significance for the development of high performance electrocatalysts and sensors.

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Section: Introductionmentioning

confidence: 99%

A self-supporting bimetallic Au@Pt core-shell nanoparticle electrocatalyst for the synergistic enhancement of methanol oxidation

Tan

Sun

Zheng

et al. 2017

Sci Rep

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“…[88][89][90] Fürt raditionelle Edelmetall-Materialien ist die Herstellung einer Nanostruktur eine effektive Mçglichkeit zur Einführung von Gitterspannung,i ndem die Zahl der Eck-oder Kantenatome mit der stärkeren Verzerrungsspannung erhçht wird. [91,[104][105][106] Die verzwillingten PtNi-Nanokristalle zeigten eine interessante geometrische Struktur und vçllig verschiedene elektrokatalytische Eigenschaften. [82,[92][93][94][95] Die kommerziellen Edelmetall-Elektrokatalysatoren (wie Pt/C) sind üblicherweise teuer,was ihren Vorteilen in der Leistung entgegensteht.…”

Section: Spannungssteuerungunclassified

“…Um dieses Problem zu lçsen, kann man durch Modifizierung der Nanostrukturen die elektrokatalytische Aktivitäts tark erhçhen. [105,106] Zusätzlich zu dem Zwillingskristall haben Adzic und Mitarbeiter eine Kern-Schale-Struktur hergestellt, bei der eine Pt-Schale einen inneren Pt/PtPb-Kern bedeckt. Es wurde gefunden, dass die Restspannung der Zickzack-Pt-Nanodrähte durch das nachträgliche Te mpern und elektrochemische Entlegierungsprozesse verursacht war, was den Gitterabstand der (111)-Pt-Ebene von 0.23 auf 0.21 nm komprimierte.Z udem zeigten First-Principles-Rechnungen, dass das d-Bandzentrum der Pt-Nanodrähte herabgesetzt wurde,einhergehend mit einer Verringerung der Oberflächen-Adsorptionsenergie.…”

Section: Spannungssteuerungunclassified

Modulierung der elektronischen Strukturen anorganischer Nanomaterialien für eine effiziente elektrokatalytische Wasserspaltung

Huang

Yan

et al. 2019

Angewandte Chemie

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Elektrokatalytische Wasserspaltung ist eine der vielversprechendsten nachhaltigen Technologien zur Energieumwandlung, ist aber eingeschränkt durch die trägen elektrochemischen Reaktionen. Anorganische Nanomaterialien sind häufig als effiziente Katalysatoren zur Förderung der elektrochemischen Kinetik verwendet worden. Verschiedene Verfahren sind zur Aktivitätsoptimierung dieser Nanokatalysatoren entwickelt worden. Die elektronischen Strukturen der Katalysatoren spielen bei der Steuerung der Aktivität eine zentrale Rolle und sind daher ein wesentlicher Deskriptor. Allerdings sind die zugrundeliegenden Funktionsweisen der verfeinerten elektronischen Strukturen nach wie vor schwer fassbar. Um die Zusammenhänge zwischen Struktur, elektronischem Verhalten und Aktivität herzuleiten, wird hier eine umfassende Zusammenstellung der bisher entwickelten Strategien zur Regulierung der elektronischen Strukturen präsentiert, mit Betonung von Oberflächenmodifizierung, Spannung, Phasenübergang und Heterostruktur. Aktuelle Probleme beim grundsätzlichen Verständnis des Verhaltens von Elektronen in den Nanokatalysatoren werden detailliert diskutiert.

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“…Based on this case, various structures have been successfully generated for Pt-based bimetallic nanostructures in a wide range of elements, such as PtPd [6−11], PtCu [12,13], PtAg [14], PtCo [15,16], PtAu [17,18], PtNi [19 −21], PtRu [22−25], and PtFe [26]. By comparison, given that Pd and Pt have nearly the same structures (the same group of the periodic table, the face-centered cubic (fcc) crystal structure and the similar lattice constants) [27,28], the PdPt bimetallic nanoparticles (NPs) are especially attractive for catalyzing multiple reactions due to the presence of the powerful catalytic components of Pd and Pt.…”

Section: Introductionmentioning

confidence: 99%

One-step synthesis of the PdPt bimetallic nanodendrites with controllable composition for methanol oxidation reaction

Zhang

Chen

et al. 2018

Sci. China Mater.

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This paper demonstrates a one-pot approach to produce highly dispersed dendritic palladium-platinum bimetallic nanoparticles (NPs) with small particle size, tunable composition and high catalytic activity. Herein, the PdPt bimetallic NPs have been obtained using bayberry tannin (BT) as both the reducing agent and surfactant. Additionally, the PdPt bimetallic NPs with different Pd/Pt atomic ratios can be prepared by just varying the amounts of the Pd and Pt precursors. Most importantly, the as-prepared Pd 52 Pt 48 catalyst exhibits the optimal catalytic activities compared with the other compositional PdPt NPs (Pd 82 Pt 18 , Pd 69 Pt 31 , and Pd 36 Pt 64 ) and commercial Pt/C (20 wt.%) catalyst for the methanol oxidation reaction (MOR). Meanwhile, Pd 52 Pt 48 also shows better CO tolerance, which can be attributed to the unique dendritic structure and the synergistic effect between Pd and Pt. With evident advantages of the facile preparation and enhanced catalytic performance, it holds great promise as a high-performance catalyst for electrochemical energy conversion.

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One‐Pot Synthesis of Highly Anisotropic Five‐Fold‐Twinned PtCu Nanoframes Used as a Bifunctional Electrocatalyst for Oxygen Reduction and Methanol Oxidation

Cited by 348 publications

References 55 publications

A self-supporting bimetallic Au@Pt core-shell nanoparticle electrocatalyst for the synergistic enhancement of methanol oxidation

A self-supporting bimetallic Au@Pt core-shell nanoparticle electrocatalyst for the synergistic enhancement of methanol oxidation

Modulierung der elektronischen Strukturen anorganischer Nanomaterialien für eine effiziente elektrokatalytische Wasserspaltung

One-step synthesis of the PdPt bimetallic nanodendrites with controllable composition for methanol oxidation reaction

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