Hollow PdCu2@Pt core@shell nanoparticles with ordered intermetallic cores as efficient and durable oxygen reduction reaction electrocatalysts

Park, Hee-Young; Park, Jin Hoo; Kim, Pil; Yoo, Sung Jong

doi:10.1016/j.apcatb.2017.11.052

Cited by 49 publications

(17 citation statements)

References 27 publications

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“…Designing well-controlled nanostructures with the two noble metals provides an effective strategy to combine their superiorities and avoid defects [ 29 , 30 , 31 ]. In recent decades, a rich variety of multi-metallic nanocrystals have been fabricated based on Pd and Pt with well-controlled morphologies and compositions [ 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 ]. For instance, Tang and his team reported a facile self-assembly strategy to prepare PtPd@Pt core/satellite nanoassemblies as cathodic electrocatalysts [ 42 ].…”

Section: Introductionmentioning

confidence: 99%

PdAgPt Corner-Satellite Nanocrystals in Well-Controlled Morphologies and the Structure-Related Electrocatalytic Properties

Qian

Guo

et al. 2021

Nanomaterials

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The functions of heterogeneous metallic nanocrystals (HMNCs) can be undoubtedly tuned by controlling their morphologies and compositions. As a less-studied kind of HMNCs, corner-satellite multi-metallic nanocrystals (CSMNCs) have great research value in structure-related electrocatalytic performance. In this work, PdAgPt corner-satellite nanocrystals with well-controlled morphologies and compositions have been developed by temperature regulation of a seed-mediated growth process. Through the seed-mediated growth, the morphology of PdAgPt products evolves from Pd@Ag cubes to PdAgPt corner-satellite cubes, and eventually to truncated hollow octahedra, as a result of the expansion of {111} facets in AgPt satellites. The growth of AgPt satellites exclusively on the corners of central cubes is realized with the joint help of Ag shell and moderate bromide, and hollow structures form only at higher reaction temperatures on account of galvanic displacement promoted by the Pd core. In view of the different performances of Pd and Pt toward formic acid oxidation (FAO), this structure-sensitive reaction is chosen to measure electrocatalytic properties of PdAgPt HMNCs. It is proven that PdAgPt CSMNCs display greatly improved activity toward FAO in direct oxidation pathway. In addition, with the help of AgPt heterogeneous shells, all PdAgPt HMNCs exhibit better durability than Pd cubes and commercial Pt.

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Section: Introductionmentioning

confidence: 99%

PdAgPt Corner-Satellite Nanocrystals in Well-Controlled Morphologies and the Structure-Related Electrocatalytic Properties

Qian

Guo

et al. 2021

Nanomaterials

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“…18 It may be that in high-temperature process, the nitrogen of the aromatic chain is more likely to form pyridinic nitrogen and graphitic nitrogen under the catalysis of transition metals (eg, Fe, Co, Ni, Mn, and Zn), which two types of nitrogen sources are considered as the ORR active sites. 21,22 Besides, in order to improve ORR catalytic activity and to maximize numbers of the ORR active sites, hollow nanostructure engineering and hierarchical porosity system has been performed, including nanotubes, [24][25][26] nitrogen-doped carbon hollow nanospheres, 27,28 and nanocage. Besides, a simple and practical method of large-scale synthesis for Fe-N-C catalysts with good ORR properties still exist great challenge.…”

Section: Introductionmentioning

confidence: 99%

“…23 For example, FeN 4 active sites were fabricated by a silica-protected strategy, but it is commonly needed to remove silica-template. 21,22 Besides, in order to improve ORR catalytic activity and to maximize numbers of the ORR active sites, hollow nanostructure engineering and hierarchical porosity system has been performed, including nanotubes, [24][25][26] nitrogen-doped carbon hollow nanospheres, 27,28 and nanocage. 29 Moreover, a variety of templates, such as Ni foam, 30 SBA-15, 31 metal organic frameworks (MOFs), 32,33 silicon dioxide, 34 or the complicated self-assembly processes, have been applied to prepare hollow and porous metal-Nx-Cy nanomaterials.…”

Section: Introductionmentioning

confidence: 99%

Template‐free synthesis of novel hollow carbon nanospheres with dual active sites as catalyst for fuel cell cathode to improve oxygen reduction reaction performances

et al. 2019

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Summary A new template‐free controlled method is reported herein to prepare the novel hollow carbon nanospheres with dual active sites of FeN4 and FeC3 by in situ growth reaction on graphene nanosheets, labeled as HCN‐FNFCG. As‐prepared HCN‐FNFCG nanomaterials possess hierarchically porous FeN4/FeC3 shells with structures of microporous, mesoporous, and macroporous properties. Moreover, the hierarchically porous HCN‐FNFCG nanomaterials with dual active sites of FeN4 and FeC3 have not been reported before. The HCN‐FNFCG nanomaterials, as oxygen reduction reaction (ORR) catalysts, are first studied systematically toward cathodic ORR of fuel cell. The measurements have illustrated that HCN‐FNFCG‐650 has the best ORR performances among these HCN‐FNFCG nanomaterials studied. The onset potential of HCN‐FNFCG‐650 has reached 1.095 V in alkaline electrolyte, and its maximum current density is 6.48 mA cm−2. Additionally, the HCN‐FNFCG‐650 has also displayed small electrochemical impedance, its Tafel‐slope value is 44.25 mV dec−1, much lower than that of the 20% Pt/C (69.57 mV dec−1). And its value of current density is still maintained 92.83% of the initial value after 9000‐second continuous tests. High tolerance against methanol crossover is also exhibited for HCN‐FNFCG‐650. This novel method of template‐free synthesis can provide a promising strategy for preparing hollow nanospheres with hierarchically porous shells. And it can be used to design ORR electrocatalysts, electrode materials, or other applications.

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“…Central to the operation of all the membraneless alkaline fuel cells is the efficient, alcohol-tolerant oxygen reduction reaction (ORR) catalyst. In spite of the prohibitive cost and low reserves [15], in addition to the sluggish kinetics and poor durability [16,17], platinum (Pt) is the most popular electrocatalyst for the ORR in alkaline fuel cells, but their ORR performances are easily degraded due to the mixedpotential and catalyst poisoning forming at the cathode. This is because Pt catalyst is also catalytically active toward alcohols so that the serious alcohol crossover through the membrane leads to the significant decay of the cell performance [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

AgSn intermetallics as highly selective and active oxygen reduction electrocatalysts in membraneless alkaline fuel cells

Wang

Chen

Liu

et al. 2018

Journal of Power Sources

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Hollow PdCu2@Pt core@shell nanoparticles with ordered intermetallic cores as efficient and durable oxygen reduction reaction electrocatalysts

Cited by 49 publications

References 27 publications

PdAgPt Corner-Satellite Nanocrystals in Well-Controlled Morphologies and the Structure-Related Electrocatalytic Properties

PdAgPt Corner-Satellite Nanocrystals in Well-Controlled Morphologies and the Structure-Related Electrocatalytic Properties

Template‐free synthesis of novel hollow carbon nanospheres with dual active sites as catalyst for fuel cell cathode to improve oxygen reduction reaction performances

AgSn intermetallics as highly selective and active oxygen reduction electrocatalysts in membraneless alkaline fuel cells

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