One-pot synthesis of three-dimensional platinum nanochain networks as stable and active electrocatalysts for oxygen reduction reactions

Xu, Jingmang; Fu, Gengtao; Tang, Yawen; Zhou, Yiming; Chen, Yu; Lu, Tianhong

doi:10.1039/c2jm32012f

Cited by 89 publications

(65 citation statements)

References 49 publications

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“…It is worth noting that the potentials for surface-oxide formation (Pt + H 2 O!PtÀOH + H + + e À ) and the following reduction on the Pt-Pd-Co TNNs positively shift by approximately 88 mV compared with E-TEK Pt black, suggesting fast hydroxyl adsorption/desorption on the Pt-Pd-Co TNN surfaces at more positive potentials. In addition, it is worth noting that the E ORR on the Pt-Pd-Co TNNs (0.925 V) is also much higher than that on the 3D network Pt nanochain (E ORR = 0.893 V) [12] and 3D network Pt nanowire membranes (E ORR = 0.880 V), [13] indicating that the Pt-Pd-Co TNNs show more competitive electrocatalytic activity towards the ORR. Figure 3 C shows typical ORR polarization curves for the Pt-Pd-Co TNNs and commercial E-TEK Pt black.…”

Section: Resultsmentioning

confidence: 99%

Pt‐Pd‐Co Trimetallic Alloy Network Nanostructures with Superior Electrocatalytic Activity towards the Oxygen Reduction Reaction

Liu¹,

Fu²,

Chen³

et al. 2013

Chemistry A European J

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Pt alloy nanostructures show great promise as electrocatalysts for the oxygen reduction reaction (ORR) in fuel cell cathodes. Herein, three-dimensional (3D) Pt-Pd-Co trimetallic network nanostructures (TNNs) with a high degree of alloying are synthesized through a room temperature wet chemical synthetic method by using K2 PtCl4 /K3 Co(CN)6 -K2 PdCl4 /K3 Co(CN)6 mixed cyanogels as the reaction precursor in the absence of surfactants and templates. The size, morphology, and surface composition of the Pt-Pd-Co TNNs are investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected-area electron diffraction (SAED), energy dispersive spectroscopy (EDS), EDS mapping, X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The 3D backbone structure, solid nature, and trimetallic properties of the mixed cyanogels are responsible for the 3D structure and high degree of alloying of the as-prepared products. Compared with commercially available Pt black, the Pt-Pd-Co TNNs exhibit superior electrocatalytic activity and stability towards the ORR, which is ascribed to their unique 3D structure, low hydroxyl surface coverage and alloy properties.

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Section: Resultsmentioning

confidence: 99%

Pt‐Pd‐Co Trimetallic Alloy Network Nanostructures with Superior Electrocatalytic Activity towards the Oxygen Reduction Reaction

Liu¹,

Fu²,

Chen³

et al. 2013

Chemistry A European J

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“…Table 1 summarizes Pt nanocrystals with varying morphologies synthesized by solvothermal methods [59,63,66,67,[76][77][78][79][80][81][82][83][84].…”

Section: Ptmentioning

confidence: 99%

Solvothermal synthesis of metal nanocrystals and their applications

et al. 2015

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“…During the kinetic growth of the Pt-NCs, the prefer adsorption of amine groups of PAH on the Pt{100} facets is responsible for the cubic shape. By measuring the relative peak areas, the percentage of Pt 0 species in the Pt-NCs is calculated to be 83.3 %, which is much higher than that in commercial E-TEK Pt black (54.5 %), [16] therefore indicating that the Pt-NCs have a weaker oxophilicity. The predominant Pt 0 4f 5/2 and Pt 0 4f 7/2 peaks are clearly observed in XPS spectrum (Figure 1 D), thus indicating the Pt II precursors are completely reduced in our synthesis.…”

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Synthesis, Self‐Assembly, and Electrocatalysis of Polyallylamine‐Functionalized Platinum Nanocubes

Zhao

Ding

et al. 2013

ChemPlusChem

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Low-temperature polymer electrolyte fuel cells (LPEFCs), such as proton-exchange membrane fuel cells, direct alcohol fuel cells, and direct formic acid fuel cells are regarded as promising power sources for automotive, portable and stationary systems. [1] Platinum-electrocatalytic oxygen reduction reaction (ORR) is one of the key reactions in LPEFCs. However, the sluggish kinetics of ORR and poor stability of electrocatalysts holds back the commercialization of LPEFCs. [1, 2] To address this issue, numerous efforts have focused on the design and manipulation of morphology, [3] composition, [4] and chemical modification [5] of Pt electrocatalysts, where rather significant progresses have been achieved. For example, Pt{100}-terminated Pt nanocubes (Pt-NCs) exhibited significantly enhanced specific activity towards the ORR in H 2 SO 4 electrolyte resulting from the facet effect. [6] In particular, the cyanide-functionalized Pt{111}-CNad showed a 25-fold increase towards the ORR compared with naked Pt{111} facets in the H 2 SO 4 electrolyte. [6] To make the most use of the Pt metal and lower the cost of LPEFCs, Pt nanoparticles are loaded on carbon nanotubes (CNTs) because of their extraordinary physical, chemical, and mechanical properties, such as large surface area, high electrical conductivity, special chemical stability, and good corrosion resistance. [7] Herein, the polyallylamine (PAH)-functionalized Pt nanocubes (Pt-NCs) are successfully synthesized through a facile hydrothermal method. The positively charged Pt-NCs are directly assembled onto the negatively charged carboxylated CNTs through electrostatic interaction. The as-prepared Pt-NCs/CNTs nanohybrid show enhanced electrocatalytic activity, durability, and alcohol tolerance towards the ORR compared with commercial Pt/C catalyst.Solution-phase growth is an effective route for the synthesis of single-crystal Pt nanostructures having high quality. In a typical synthesis of the Pt-NCs, solutions of K 2 PtCl 4 , PAH, and HCHO were mixed together with water, and the pH of the resulting mixture was adjusted to 3.0. The homogeneous solution was heated at 140 8C for 6 hours to obtain the PAH-functionalized Pt-NCs. Then, the carboxylated CNTs were added into the above Pt-NCs suspension and sonicated for 2 hours, then separated by centrifugation. Finally, the as-prepared Pt-NCs/CNTs nanohybrid was consecutively treated with UV/ ozone and electrochemical cleaning to remove the majority of capping agent (i.e. PAH) prior to electrochemical testing (see the Experimental Section for details).The morphology of the Pt nanocrystals was investigated by transmission electron microscopy (TEM). As observed, the asprepared Pt nanocrystals are well-defined and preserve a cubic shape (87 % cubes, 4 % triangles, and 9 % irregular shapes, Figure 1 A). The average edge length of the Pt-NCs is 4 nm. The well-resolved lattice fringes and selected area electron diffraction (SAED) pattern indicate the single crystal structure of the Pt-NCs (Figure 1 B). The d spacing of adjacen...

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One-pot synthesis of three-dimensional platinum nanochain networks as stable and active electrocatalysts for oxygen reduction reactions

Cited by 89 publications

References 49 publications

Pt‐Pd‐Co Trimetallic Alloy Network Nanostructures with Superior Electrocatalytic Activity towards the Oxygen Reduction Reaction

Pt‐Pd‐Co Trimetallic Alloy Network Nanostructures with Superior Electrocatalytic Activity towards the Oxygen Reduction Reaction

Solvothermal synthesis of metal nanocrystals and their applications

Synthesis, Self‐Assembly, and Electrocatalysis of Polyallylamine‐Functionalized Platinum Nanocubes

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