Crossed PtCoCu Alloy Nanocrystals with High‐Index Facets as Highly Active Catalyst for Methanol Oxidation Reaction

Xia, Zhonghong; Zhang, Purui; Feng, Guang; Xia, Dingguo; Zhang, Jiujun

doi:10.1002/admi.201800297

Cited by 21 publications

(18 citation statements)

References 47 publications

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“…The HEA‐NPs/carbon‐700 °C shows stable electrocatalytic performance over an 8 h period. The superior electrocatalytic performance of HEA‐NPs/carbon‐700 °C is ascribed to strong synergistic effects resulting from different metallic atoms . With addition of the different elements, the entropy of the alloy system greatly increases.…”

Section: Methodsmentioning

confidence: 99%

Entropy‐Maximized Synthesis of Multimetallic Nanoparticle Catalysts via a Ultrasonication‐Assisted Wet Chemistry Method under Ambient Conditions

Liu

Zhang

Okejiri

et al. 2019

Adv Materials Inter

166

146

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A facile ultrasonication‐assisted wet chemistry method for preparing multicomponent alloy nanoparticles (NPs) including high‐entropy alloys (HEAs) is reported. PtAuPdRhRu alloy (HEA), quaternary PtAuPdRh alloy, and ternary PtAuPd alloy NPs are produced with ≈3 nm in diameter. Taking advantage of the acoustic cavitation phenomenon in ultrasonication process, noble metal precursors could be co‐reduced by chemical reductants and transform to alloy structures under operation at room conditions. The instantaneous massive energy (≈5000 °C, 2000 atm) occurring in momentary timespans (≤10−9 s) contributes to the formation of multimetallic mixed nanomaterials driven by entropy maximization. Owing to strong synergistic effects, the catalysts with the HEA NPs supported on carbons exhibit prominent electrocatalytic activities for hydrogen evolution reaction.

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Section: Methodsmentioning

confidence: 99%

Entropy‐Maximized Synthesis of Multimetallic Nanoparticle Catalysts via a Ultrasonication‐Assisted Wet Chemistry Method under Ambient Conditions

Liu

Zhang

Okejiri

et al. 2019

Adv Materials Inter

166

146

View full text Add to dashboard Cite

show abstract

“…[37,38] 4) They can be improved by controlling the shape and crystal plane of the Pt nanocrystals to maximize the exposure of the crystal planes that favor the catalysis of the ORR. [39][40][41] These methods reduce the Pt content of the catalyst to a certain extent and improve the catalytic activity and stability of the Pt-based catalyst. However, from the long-term development Reproduced with permission.…”

Section: Platinum-based Catalystmentioning

confidence: 99%

“…3) Selecting a catalyst carrier with strong interaction with Pt can improve the stability of Pt and Pt‐based catalysts and can also produce a synergistic cocatalytic effect by interaction of Pt nanoparticles with carriers . 4) They can be improved by controlling the shape and crystal plane of the Pt nanocrystals to maximize the exposure of the crystal planes that favor the catalysis of the ORR …”

Section: Introduction To Oxygen Reduction Catalystmentioning

confidence: 99%

Recent Advances and Prospects of Metal‐Based Catalysts for Oxygen Reduction Reaction

et al. 2019

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Fuel cells, as one of the most promising technologies in sustainable energy conversion systems, hold great expectations for commercial applications. Cathode oxygen reduction reaction (ORR) kinetics of fuel cells are very slow and require a large overpotential to make the reaction occur, which greatly limits the energy output of fuel cells. Therefore, designing and preparing a highly active and stable ORR catalyst has become a great challenge. Herein, recent advances in platinum‐based and platinum‐free materials in metal‐based catalysts are focused on, including structural properties, synthesis methods, performance characterization, and catalytic mechanisms. Although platinum‐based precious metal catalysts have excellent performance, high prices limit the scale of commercial fuel cells. Nonprecious metal catalysts (e.g., transition metal nitrogen‐doped carbon‐based catalysts (M‐N/C), transition metal compounds (transition metal oxides—TMOs, transition metal carbides—TMCs, transition metal nitrides/transition metal oxynitrides—TMNs/TMNOs), layered double hydroxides—LDHs) completely eliminate dependence on precious metals and exhibit excellent ORR catalytic activity and stability. Finally, the ideas for future design and preparation of new ORR catalysts and challenges in the future of research work are discussed.

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“…12 In particular, ternary alloyed Pt-Co-Cu/C nanoparticles demonstrate excellent catalytic performances as both Pt-Cu or Pt-Co catalysts have been reported better performances for the ORR. [34][35][36][37] Here we prepared a series of PtCoxCu1-x/C catalysts which have shown further improved ORR activity and better stability compare to above mentioned bimetallic NPs. Briefly, Carbon supported chemically ordered structure PtCo/C was firstly synthesized by an impregnation method, followed by annealing at 700 o C for 2 hours in 5% H2 environment.…”

Section: Introductionmentioning

confidence: 99%

Chemically Ordered Pt–Co–Cu/C as Excellent Electrochemical Catalyst for Oxygen Reduction Reaction

Zhang

Wang

et al. 2020

J. Electrochem. Soc.

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This paper reveals the ordered structure and composition effect to electrochemical catalytic activity towards oxygen reduction reaction (ORR) of ternary metallic Pt-Co-Cu/C catalysts. Bimetallic Pt-Co alloy nanoparticles (NPs) represent an emerging class of electrocatalysts for ORR, but practical applications, e.g. in fuel cells, have been hindered by low catalytic performances owning to crystal phase and atomic composition. Cu is introduced into Pt-Co/C lattices to form PtCoxCu1−x/C (x=0.25, 0.5 and 0.75) ternary-face-centered tetragonal (fct) ordered ternary metallic NPs. The chemically ordered Pt-Co-Cu/C catalysts exhibit excellent performance of 1.31 A mg-1 Pt in mass activity and 0.59 A cm-2 Pt in specific activity which are significantly higher than Pt-Co/C and commercial Johnson Matthey (JM) Pt/C catalysts, because of the ordered crystal phase and composition control modified the Pt-Pt atoms distance and the surface electronic properties. The presence of Cu improves the surface electronic structure, as well as enhances the stability of catalysts.

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Crossed PtCoCu Alloy Nanocrystals with High‐Index Facets as Highly Active Catalyst for Methanol Oxidation Reaction

Cited by 21 publications

References 47 publications

Entropy‐Maximized Synthesis of Multimetallic Nanoparticle Catalysts via a Ultrasonication‐Assisted Wet Chemistry Method under Ambient Conditions

Entropy‐Maximized Synthesis of Multimetallic Nanoparticle Catalysts via a Ultrasonication‐Assisted Wet Chemistry Method under Ambient Conditions

Recent Advances and Prospects of Metal‐Based Catalysts for Oxygen Reduction Reaction

Chemically Ordered Pt–Co–Cu/C as Excellent Electrochemical Catalyst for Oxygen Reduction Reaction

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