Multi-component nanoporous platinum–ruthenium–copper–osmium–iridium alloy with enhanced electrocatalytic activity towards methanol oxidation and oxygen reduction

Chen, Xiaoting; Si, Conghui; Gao, Yulai; Frenzel, Jan; Sun, Junzhe; Eggeler, Gunther; Zhang, Zhonghua

doi:10.1016/j.jpowsour.2014.09.076

Cited by 98 publications

(55 citation statements)

References 72 publications

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“…The reference electrode was saturated calomel electrode (SCE) and the counter electrode was a bright Pt plate. The catalyst ink preparation and measurement conditions were consistent with our previous report [34,53]. For comparison, we benchmarked the electrochemical properties of the np-PtRuCuW against the commercial (Johnson's Matthey, Pennsylvania, PA, USA) PtC and PtRu catalysts under identical experimental conditions.…”

Section: Electrochemical Characterizationmentioning

confidence: 80%

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Synthesis and Electrocatalytic Performance of Multi-Component Nanoporous PtRuCuW Alloy for Direct Methanol Fuel Cells

Chen

Wang

et al. 2015

Catalysts

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Abstract:We have prepared a multi-component nanoporous PtRuCuW (np-PtRuCuW) electrocatalyst via a combined chemical dealloying and mechanical alloying process. The X-ray diffraction (XRD), transmission electron microscopy (TEM) and electrochemical measurements have been applied to characterize the microstructure and electrocatalytic activities of the np-PtRuCuW. The np-PtRuCuW catalyst has a unique three-dimensional bi-continuous ligament structure and the length scale is 2.0 ± 0.3 nm. The np-PtRuCuW catalyst shows a relatively high level of activity normalized to mass (467.1 mA mgPt) and electrochemically active surface area (1.8 mA cm −2 ) compared to the state-of-the-art commercial PtC and PtRu catalyst at anode. Although the CO stripping peak of np-PtRuCuW 0.47 V (vs. saturated calomel electrode, SCE) is more positive than PtRu, there is a 200 mV negative shift compared to PtC (0.67 V vs. SCE). In addition, the half-wave potential and specific activity towards oxygen reduction of np-PtRuCuW are 0.877 V (vs. reversible hydrogen electrode, RHE) and 0.26 mA cm −2 , indicating a great enhancement towards oxygen reduction than the commercial PtC. OPEN ACCESSCatalysts 2015, 5 1004

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Section: Electrochemical Characterizationmentioning

confidence: 80%

“…% purity) as before [34,53]. Then, dealloying of the Al66Cu30(Pt53Ru32W15)4 alloy powders was carried out in a 1 M HNO3 solution at room temperature until no obvious bubbles emerged.…”

Section: Synthesis and Characterizations Of Np-ptrucuwmentioning

confidence: 99%

Synthesis and Electrocatalytic Performance of Multi-Component Nanoporous PtRuCuW Alloy for Direct Methanol Fuel Cells

Chen

Wang

et al. 2015

Catalysts

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“…These constituent elements are chosen because their similar atomic radii and low heat of formation make them likely to form a stable HEA (see Equations S1 and S2 for full details) and because the standard electrode potentials for all elements are high, which in turn reduces the likelihood of oxidation of the alloy. We establish the stability theoretically in the following section and have found examples of similar HEAs that have been successfully synthesized 13,15,23 and show promising catalytic properties.…”

Section: Context and Scalementioning

confidence: 96%

High-Entropy Alloys as a Discovery Platform for Electrocatalysis

Batchelor

Pedersen

Winther

et al. 2019

Joule

651

620

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A theoretical method for finding active alloy electrocatalysts is proposed, and the method is applied to the electrochemical half-cell reaction of reducing oxygen to water, which is vital for improving the efficiency of, for example, hydrogen fuel cells. Our method predicts adsorption energies between reaction intermediates and the alloy surface to discover which sites on the surface are the most active. Starting from the multicomponent alloy IrPdPtRhRu, the alloy composition with best predicted catalytic activity is found.

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“…Remarkably, the mass-normalized current densities of both Pt and CoNi@Pt W/IL nanorods were also higher than the state-of-the-art Pt-based nanorods, or other Pt nanomaterials reported previously (around 2 to 6 times more depending on the nanostructure, in the same experimental conditions.). 45,[53][54][55] The j f /j b values were 2.89, 1.88, 2.81, and 3.26 for W, W/IL, W +S, and W +PS, respectively, values far higher than those corresponding to the pure Pt nanorods, which reveals that the CoNi@Pt nanorods present a higher good-poison tolerance. Hence the obtained W/IL mesoporous nanorods, especially the core@shell, could be proposed as a suitable electrocatalysts due to their extraordinary performance respect to the methanol oxidation.…”

Section: Resultsmentioning

confidence: 89%

Novel electrodeposition media to synthesize CoNi-Pt Core@Shell stable mesoporous nanorods with very high active surface for methanol electro-oxidation

Serrà¹,

Gómez²,

Vallés³

2015

Electrochimica Acta

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Three strategies have been tested to obtain stable mesoporous CoNi@Pt nanorods with a very high effective area and good performance for methanol electro-oxidation. They are based on, firstly, an electrochemical synthesis of the CoNi nanorods using three clearly different systems (micellar solution, water-in-ionic liquid microemulsion and suspension of polystyrene nanoparticles), and, secondly, a posterior platinum shell formation by interfacial replacement reaction. The obtained nanorods have been compared with pure platinum ones prepared following the three methods. Mesoporous CoNi@Pt nanorods with a very high active surface have been obtained by using the suspension of polystyrene nanoparticles and especially the water-in-ionic liquid microemulsion. All the mesoporous nanorods (of both Pt and CoNi@Pt) show very good performance for methanol oxidation in comparison with compact ones or the usual Pt/C catalyzers. However, the mesoporous CoNi@Pt nanorods have demonstrated better performance than the corresponding platinum ones for methanol oxidation due to the more active platinum atoms in the shell of platinum than in the bulk, the higher good poison tolerance and the lower cost of the materialowing to the drastic saving in platinum in the nanostructures. The mesoporous CoNi@Pt nanorods obtained from the water-in-ionic liquid microemulsion are the best candidates as electrocatalysers because they provide a significantly higher mass-normalized current density (1326 mA mg-1), a good stability in the sulfuric acidic medium and a significant electrocatalytic stability under continuous operating conditions.

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Multi-component nanoporous platinum–ruthenium–copper–osmium–iridium alloy with enhanced electrocatalytic activity towards methanol oxidation and oxygen reduction

Cited by 98 publications

References 72 publications

Synthesis and Electrocatalytic Performance of Multi-Component Nanoporous PtRuCuW Alloy for Direct Methanol Fuel Cells

Synthesis and Electrocatalytic Performance of Multi-Component Nanoporous PtRuCuW Alloy for Direct Methanol Fuel Cells

High-Entropy Alloys as a Discovery Platform for Electrocatalysis

Novel electrodeposition media to synthesize CoNi-Pt Core@Shell stable mesoporous nanorods with very high active surface for methanol electro-oxidation

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