Structure evolution of PtCu nanoframes from disordered to ordered for the oxygen reduction reaction

The multidimensional PtZn quasi‐cubic nanodendrites (PtZn‐ND) with tremendous amounts of defectively coarse branches, having both highly active high‐index facets and short‐range (100) and (110) terraces resisted to sulfate, are synthesized via facile oil phase route at first time. The growth process is found to start from Pt nano‐cuboid seeds, then PtZn nanoclovers which are formed from epitaxial growth, and then the flower‐like PtZn crystals and finally the novel PtZn‐ND. The formation mechanism of PtZn‐ND, in particular the effects of hexadecyltrimethyammonium bromide (CTAB) and oleic acid (OA) on the morphology, crystal shape and exposure lattice facets, have been comparatively and systematically studied. And it turns out that CTAB mainly controls depositing directions, while OA mainly controls the crystal shape/size. The combination effect results in unique PtZn‐ND structures. The novel PtZn‐ND also displays superior catalytic performance and anti‐sulfate poisoning ability. In particular, the mass activity (MA) and specific activity (SA) are 5.72 and 7.55 times higher than those of commercial Pt/C, and still 2.91 and 5.09 times higher after accelerated durability tests in 0.5 m H2SO4 for oxygen reduction reaction.

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“…Additionally, the prior dissolution of Zn can retard the dissolution rate of Pt, thereby promote the stability of the Pt. [ 46,60,61 ]…”

Section: Resultsmentioning

confidence: 99%

Controlled Preparation and Anti‐Sulfate Electrocatalysis of Self‐Assembled Multidimensional PtZn Quasi‐Cubic Nanodendrites

Xing

Yan

Wei

et al. 2022

Adv Materials Inter

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“…Intermetallic L1 1 ‐PtCu has better electronic interaction between Pt and Cu than the L1 0 or L1 2 phases of Pt–Fe, Pt–Co, and Pt–Ni systems [ 151 ] although it has mostly been developed recently with only a few reports. [ 152 ] Xin and co‐workers prepared L1 1 ‐PtCu nanoparticles on carbon by first impregnating Pt(acac) 2 and Cu(acac) 2 on carbon, followed by annealing at 800 °C under 5% H 2 in Ar flow. [ 153 ] Additionally, they doped nitrogen into the intermetallic PtCu alloy by flowing ammonia for 2 h at 500 °C before the temperature was raised to 800 °C (Figure 9k ).…”

Section: Synthetic Methods For Various Nmmnsmentioning

confidence: 99%

Noble Metal‐Based Multimetallic Nanoparticles for Electrocatalytic Applications

et al. 2021

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Noble metal-based multimetallic nanoparticles (NMMNs) have attracted great attention for their multifunctional and synergistic effects, which offer numerous catalytic applications. Combined experimental and theoretical studies have enabled formulation of various design principles for tuning the electrocatalytic performance through controlling size, composition, morphology, and crystal structure of the nanoparticles. Despite significant advancements in the field, the chemical synthesis of NMMNs with ideal characteristics for catalysis, including high activity, stability, product-selectivity, and scalability is still challenging. This review provides an overview on structure-based classification and the general synthesis of NMMN electrocatalysts. Furthermore, postsynthetic treatments, such as the removal of surfactants to optimize the activity, and utilization of NMMNs onto suitable support for practical electrocatalytic applications are highlighted. In the end, future direction and challenges associated with the electrocatalysis of NMMNs are covered.

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“…Nanostructures’s 3D morphology, in both terms of the particle size and shape, can be better studied by 3D electron tomography. A number of electrocatalysts with different morphology have been investigated, including nanoporous and nanodendrites ( Mourdikoudis et al, 2013 ; Geboes et al, 2016 ; Mourdikoudis et al, 2019 ; Pappert et al, 2019 ; Yu et al, 2019 ), nano platelets ( Kong et al, 2013 ; Toth et al, 2016 ; González-Jiménez et al, 2018 ), nanoframes and nanocages ( Becknell et al, 2017 ; Zhang et al, 2019a ; Gong, 2021a ), nanowires ( Bu et al, 2016 ; Liu et al, 2020 ), and the most widely studied nanoparticles ( Liu et al, 2012 ; Lu et al, 2014 ; Mourdikoudis et al, 2015 ; Londono-Calderon et al, 2017 ; Kang et al, 2018 ; Gong, 2021b ; Frank et al, 2021 ; Leteba et al, 2021 ).…”

Section: D Electron Tomography For Electrocatalysts At Nanoscalementioning

confidence: 99%

Recent Progress on Revealing 3D Structure of Electrocatalysts Using Advanced 3D Electron Tomography: A Mini Review

Wang

2022

Front. Chem.

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Electrocatalysis plays a key role in clean energy innovation. In order to design more efficient, durable and selective electrocatalysts, a thorough understanding of the unique link between 3D structures and properties is essential yet challenging. Advanced 3D electron tomography offers an effective approach to reveal 3D structures by transmission electron microscopy. This mini-review summarizes recent progress on revealing 3D structures of electrocatalysts using 3D electron tomography. 3D electron tomography at nanoscale and atomic scale are discussed, respectively, where morphology, composition, porous structure, surface crystallography and atomic distribution can be revealed and correlated to the performance of electrocatalysts. (Quasi) in-situ 3D electron tomography is further discussed with particular focus on its impact on electrocatalysts’ durability investigation and post-treatment. Finally, perspectives on future developments of 3D electron tomography for eletrocatalysis is discussed.

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Structure evolution of PtCu nanoframes from disordered to ordered for the oxygen reduction reaction

Cited by 97 publications

References 47 publications

Controlled Preparation and Anti‐Sulfate Electrocatalysis of Self‐Assembled Multidimensional PtZn Quasi‐Cubic Nanodendrites

Controlled Preparation and Anti‐Sulfate Electrocatalysis of Self‐Assembled Multidimensional PtZn Quasi‐Cubic Nanodendrites

Noble Metal‐Based Multimetallic Nanoparticles for Electrocatalytic Applications

Recent Progress on Revealing 3D Structure of Electrocatalysts Using Advanced 3D Electron Tomography: A Mini Review

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