Three-dimensional hierarchical porous platinum–copper alloy networks with enhanced catalytic activity towards methanol and ethanol electro-oxidation

Fan, Yang; Liu, Peifang; ZongWen, Zhang; Cui, Ying; Zhang, Yan

doi:10.1016/j.jpowsour.2015.07.078

Cited by 44 publications

(19 citation statements)

References 50 publications

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“…[8][9][10] Various approaches have been employed for synthesis of bimetallic porous materials. Among these approaches are hard-and softtemplating, [11][12][13][14] hydrothermal process 15 and galvanic replacement [16][17] . However, in all these approaches there are no directing elements that ensure a controlled distribution of the two metals within the nanostructures.…”

Section: Introductionmentioning

confidence: 99%

Bimetallic Pt–Re Nanoporous Networks: Synthesis, Characterization, and Catalytic Reactivity

Nijem¹,

Dery²,

Carmiel³

et al. 2018

J. Phys. Chem. C

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The preparation of bimetallic nanoporous networks (BNNs) that combine the high surface area and thermal stability of inorganic nanostructures with the unique catalytic properties of bimetallic systems is highly desirable. Here we show a simple and highly versatile approach for synthesis of Pt-Re BNN and demonstrate the influence of preparation conditions on the BNN structure, composition and catalytic reactivity. Pt-Re BNN was prepared by reduction of double complex [Pt(NH 3 ) 4 ][Re(Cl 6 )] salt crystals, in which two oppositely-charged metal complexes are evenly distributed in each unit cell in a 1:1 ratio. Exposure of the salt crystals to reducing conditions induced the evaporation of the inorganic ligands, collapse of the salt structure and reduction of the metal ions for the formation of high surface area Pt-Re BNNs. Single-particle X-ray fluorescence tomography and various ensemble-based spectroscopy measurements (XPS and XANES) identified that the bulk and surface composition of the bimetallic structure and the oxidation state of the two metals can be tuned by adjusting the reduction temperature of the bimetallic salt. Pt-Re BNN showed reactivity in deoxydehydration reaction of glycerol toward the selective formation of allyl alcohol. Combination of reactivity and spectroscopic measurements revealed that enhanced reactivity was correlated to the presence of highly oxidized Re species (mostly Re +7 ) and equal distribution of Pt and Re on the BNN surface.

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Section: Introductionmentioning

confidence: 99%

Bimetallic Pt–Re Nanoporous Networks: Synthesis, Characterization, and Catalytic Reactivity

Nijem¹,

Dery²,

Carmiel³

et al. 2018

J. Phys. Chem. C

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“…The strong peaks located at 932.8 and 952.6 eV are assigned to metallic Cu 0 , indicating that most of Cu species have zero‐valance. The minor doublet at 935.0 and 955.1 eV and the presence of statellite signals located at 943.8 and 963.1 eV demonstrate a small amount of CuO is absorbed on alloy surface owing to the nanostructured Cu oxidation in air atmosphere . The Pt 4f spectra in Figure d show a major pair of metallic Pt peaks at 71.2 and 74.6 eV, while the other two weaker set of doublets (72.0, 75.6, 77.0, 78.2 eV) could be ascribed to Pt oxides .…”

Section: Figurementioning

confidence: 92%

Self‐Powered Low‐Platinum Nanorod Alloy Monoelectrodes for Rain Energy Harvest

Duan

Zhao

et al. 2018

Energy Tech

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Here self‐powered low‐platinum coated copper nanorod alloy monoelectrodes are designed to generate electricity from rain, assisted by poly(ethylene oxide)/polyaniline conductive adhesive. Arising from charging/discharging processes of the electric double‐layer pseudocapacitance at electron‐enriched monoelectrode/rainwater interfaces, the monoelectrode yields a current signal of several microamps under dripping simulated raindrops. By optimizing stoichiometric Cu/Pt ratio, dripping velocity, cation concentration, and cation species, the current outputs are maximized.

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“…[15] H 2 PtCl 6 ·6 H 2 O( 0.3 mmol, Strem Chemi- www.chemsuschem.org cals) and CuCl 2 ·2 H 2 O(0.3 mmol, ACROS) were dissolved in asolvent mixture containing deionized water (20 mL, Direct-Q 3UV) and ethylene glycol (40 mL, Alfa Aesar). [15] H 2 PtCl 6 ·6 H 2 O( 0.3 mmol, Strem Chemi- www.chemsuschem.org cals) and CuCl 2 ·2 H 2 O(0.3 mmol, ACROS) were dissolved in asolvent mixture containing deionized water (20 mL, Direct-Q 3UV) and ethylene glycol (40 mL, Alfa Aesar).…”

Section: Methodsmentioning

confidence: 99%

“…Catalyst synthesis Platinum-copper alloy was synthesized by am ethod developed by Zhang and co-workers. [15] H 2 PtCl 6 ·6 H 2 O( 0.3 mmol, Strem Chemi- &:1 0mgcm À2 PtCu;~:2mgcm À2 PtRu/C; inset:1 0mgcm À2 1:1PtRu, 40 sccm DME gas, 1.0 bar back pressure;cathode:2mg cm À2 Pt/C E-TEK, 100 sccm O 2 ,1 .0 bar back pressure;N afion1 17 membrane;g as temperature = 80 8C; cell temperature = 80 8C. www.chemsuschem.org cals) and CuCl 2 ·2 H 2 O(0.3 mmol, ACROS) were dissolved in asolvent mixture containing deionized water (20 mL, Direct-Q 3UV) and ethylene glycol (40 mL, Alfa Aesar).…”

Section: Methodsmentioning

confidence: 99%

Direct Electro‐oxidation of Dimethyl Ether on Pt−Cu Nanochains

2017

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A new platinum-copper alloy electrocatalyst for the direct electro-oxidation of dimethyl ether (DME) has been synthesized in an easy and low-cost approach and studied by using an array of techniques, including X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, and elemental analysis. Structural characterization revealed that the synthesized PtCu nanoparticles (3 nm on average) formed homogeneous nanochains without aggregation of metallic platinum or copper. The catalyst's activity towards electro-oxidation of DME was tested using cyclic voltammetry (CV) and in membrane-electrode assembly (MEA) in a full cell and was found to be promising. The direct DME fuel cell (DDMEFC) studied in this work has relatively high energy density, of 13.5 mW cm and thus shows great potential as fuel for low power fuel cells. The newly synthesized PtCu catalyst exhibited almost double the performance of commercial PtRu in electrocatalytic DME oxidation.

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Three-dimensional hierarchical porous platinum–copper alloy networks with enhanced catalytic activity towards methanol and ethanol electro-oxidation

Cited by 44 publications

References 50 publications

Bimetallic Pt–Re Nanoporous Networks: Synthesis, Characterization, and Catalytic Reactivity

Bimetallic Pt–Re Nanoporous Networks: Synthesis, Characterization, and Catalytic Reactivity

Self‐Powered Low‐Platinum Nanorod Alloy Monoelectrodes for Rain Energy Harvest

Direct Electro‐oxidation of Dimethyl Ether on Pt−Cu Nanochains

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