Mesoporous PdCo sponge-like nanostructure synthesized by electrodeposition and dealloying for oxygen reduction reaction

Tominaka, Satoshi; Hayashi, Tomoya; Nakamura, Yusuke; Osaka, Tetsuya

doi:10.1039/c0jm00973c

Cited by 69 publications

(50 citation statements)

References 37 publications

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“…It was found that a mild annealing of the alloys at moderate temperatures (350 °C) was desirable to clean the surface and maximize the catalytic activity and durability [245][246][247]. Tominaka et al [248] synthesized a mesoporous PdCo sponge-like nanostructure with a most desirable lattice contraction into a Pd catalyst for the ORR. The mesoporous PdCo catalyst had a higher specific activity than that of the Pt catalyst.…”

Section: Pdco Alloysmentioning

confidence: 99%

Recent Development of Pd-Based Electrocatalysts for Proton Exchange Membrane Fuel Cells

2015

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This review selectively summarizes the latest developments in the Pd-based cataysts for low temperature proton exchange membrane fuel cells, especially in the application of formic acid oxidation, alcohol oxidation and oxygen reduction reaction. The advantages and shortcomings of the Pd-based catalysts for electrocatalysis are analyzed. The influence of the structure and morphology of the Pd materials on the performance of the Pd-based catalysts were described. Finally, the perspectives of future trends on Pd-based catalysts for different applications were considered.

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Section: Pdco Alloysmentioning

confidence: 99%

Recent Development of Pd-Based Electrocatalysts for Proton Exchange Membrane Fuel Cells

2015

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“…It should be noted that the means of control of the pore characteristics depend on both the strategy used to create the porosity within the material and the considered material itself. For example, to create nanoporous metals, ''dealloying'' is the most popular method which has been developed so far [9,11,12,16,19,45,[49][50][51][52][53][54][55][56]. This approach consists in removing one of two alloyed metals using a selective corrosion process [54,57].…”

Section: Introductionmentioning

confidence: 99%

“…However, to ensure a preferential etching, the oxidation potentials of the two selected metals forming the initial alloy must be very different, where the metal with the lower oxidation potential will be etched selectively leaving behind the more noble one. In general, the dealloying method is employed to create porous noble metals (Pd [49], Pt [15][16][17]45], and Au [9,11,12,51,58]) exhibiting very high oxidation potentials compared to other metals used in the alloys such as Ag, Co and Cu. The phenomena occurring during the dealloying process (e.g., dissolution of the less noble metal atoms, surface diffusion of the more noble metal, strains generation, etc.…”

Section: Introductionmentioning

confidence: 99%

Sponge-like carbon thin films: The dealloying concept applied to copper/carbon nanocomposite

Bouts

Mel

Angleraud

2015

Carbon

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“…Therefore, the successful synthesis of 1D mesoporous Pt motifs can be expected to be a new direction in the fabrication of superior electrocatalysts. [12] However, it is hard to control the sizes of the mesopores and to construct robust mesopore walls.Herein, we report a general "all-wet electrochemical approach" to synthesize novel self-supported 1D Pt nanorods (NRs) with a high density of mesopores (which are denoted as "mesoporous Pt nanorods, MPNRs") by using the assembly of micelles [13] in the confined space of a polycarbonate (PC) membrane. Lyotropic liquid crystals (LLCs) made of highly concentrated surfactants have also been used as soft templates.…”

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confidence: 99%

Electrochemical Synthesis of One‐Dimensional Mesoporous Pt Nanorods Using the Assembly of Surfactant Micelles in Confined Space

Sato

Yamauchi

2013

Angewandte Chemie

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One-dimensional metallic nanostructures, particularly those composed of noble metals, have sparked great scientific interest for practical applications, owing to their uniquely anisotropic structure. [1] Recent advances in energy conversion materials have shown that 1D materials are particularly effective as electrocatalysts for the methanol oxidation reaction (MOR) and oxygen reduction reaction (ORR) at low costs. [2] The facile synthesis of 1D Pt nanocatalysts (e.g., nanorods, [3] nanowires, [4] nanotubes, [5] and others [6] ) with noteworthy enhanced electrocatalytic activity and durability is becoming increasingly important.On the other hand, the formation of well-defined nano/ mesoporous structures [7] of metals affords electrocatalysts showing a superior performance because of their high porosity, large area per unit volume, and excellent activitystructure relationship. Therefore, the successful synthesis of 1D mesoporous Pt motifs can be expected to be a new direction in the fabrication of superior electrocatalysts. The traditional hard-templating method, which is widely used to synthesize mesoporous carbon materials, [8] metal oxides, [9] and metals, [10] cannot easily be used for the synthesis of 1D mesoporous metal motifs, because this method involves several steps: the formation of an original template followed by deposition of metals within the mesopores and subsequent removal of the template. Lyotropic liquid crystals (LLCs) made of highly concentrated surfactants have also been used as soft templates. [11] However, due to the high viscosity of the LLCs, it is not so easy to deposit selectively metals in the target area. The method using LLCs cannot be applied as a general electrochemical method for shape-controlled synthesis of mesoporous metals. As another way, the alloydealloying approach, in which a less noble metal is selectively dissolved from a bimetallic alloy, is an attractive and much used strategy to synthesize porous metals. [12] However, it is hard to control the sizes of the mesopores and to construct robust mesopore walls.Herein, we report a general "all-wet electrochemical approach" to synthesize novel self-supported 1D Pt nanorods (NRs) with a high density of mesopores (which are denoted as "mesoporous Pt nanorods, MPNRs") by using the assembly of micelles [13] in the confined space of a polycarbonate (PC) membrane. The MPNRs with various aspect ratios can be synthesized by simply controlling the electrodeposition times. The fabrication procedure of 1D MPNRs is schematically illustrated in Figure 1. A Pt thin film serving as conductive layer was deposited on one side of the PC membrane with a pore size of 50 nm (see Figure S1 in the Supporting Information). The electrolyte solution containing K 2 PtCl 4 and 1.0 wt % Brij 58 (C 16 H 33 (OCH 2 CH 2 ) 20 OH) was used to prepare 1D MPNRs at a constant potential of À0.2 V vs. Ag/ AgCl at room temperature. After the electrodeposition, the PC membranes were soaked in NaOH and ethanol solutions to dissolve the PC membranes and the surfa...

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Mesoporous PdCo sponge-like nanostructure synthesized by electrodeposition and dealloying for oxygen reduction reaction

Cited by 69 publications

References 37 publications

Recent Development of Pd-Based Electrocatalysts for Proton Exchange Membrane Fuel Cells

Recent Development of Pd-Based Electrocatalysts for Proton Exchange Membrane Fuel Cells

Sponge-like carbon thin films: The dealloying concept applied to copper/carbon nanocomposite

Electrochemical Synthesis of One‐Dimensional Mesoporous Pt Nanorods Using the Assembly of Surfactant Micelles in Confined Space

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