Direct solution-based reduction synthesis of Au, Pd, and Pt aerogels

Burpo, F. John; Nagelli, Enoch A.; Morris, Lauren A.; McClure, Joshua P.; Ryu, Madeline Y.; Palmer, Jesse L.

doi:10.1557/jmr.2017.412

Cited by 55 publications

(61 citation statements)

References 53 publications

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“…−, Such porous structures confer the advantages of electrical conductivity, mechanical strength, resistance to agglomeration, and control over mass transfer properties. Combining the high surface area to volume ratio advantage of individual nanoparticles in a contiguous 3‐dimensional porous architecture via a one‐step reduction synthesis would be highly beneficial as in the case of previously demonstrated direct reduction noble metal aerogels . Salt templating of two‐dimensional metal oxides offers a potential approach to templating such 3‐dimensional porous materials ,…”

Section: Figurementioning

confidence: 99%

Salt‐Templated Hierarchically Porous Platinum Macrotube Synthesis

et al. 2018

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Hierarchically structured platinum macrotubes with square cross‐section and porous sidewalls composed of fibril textured nanoparticles are synthesized from high aspect ratio insoluble Mangus’ salt needles in a single reduction step. Macrotubes 10’s to 100’s of micrometers long pressed into free‐standing films exhibit a specific capacitance of 18.5 Fg−1 and a solvent accessible specific surface area of 61.7 m2g−1. Insoluble salt templates offer a synthesis route to achieve a range of porous metal structures.

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Section: Figurementioning

confidence: 99%

Salt‐Templated Hierarchically Porous Platinum Macrotube Synthesis

et al. 2018

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Section: One-step Methodsmentioning

confidence: 99%

“…On the other hand, an increase of the reactant concentrations was also found to considerably accelerate the gelation process. As shown in Figure d,e, Au, Pd, and Pt gels were instantly produced by mixing highly concentrated solutions of reductants (100 × 10 −3 m NaBH 4 , NaH 2 PO 2 , or dimethylamine borane) and metal salts (5–100 × 10 −3 m ) . However, low SSAs of less than 20.6 m 2 g −1 were obtained for all aerogels, presumably owing to the large ligament sizes resulting from the ultrafast reaction kinetics.…”

Section: Fabrication Strategiesmentioning

confidence: 99%

“…d,e) Proposed gelation process of noble metals induced by NaBH 4 reduction with high precursor concentrations with photographs of the corresponding NMAs. Adapted with permission . Copyright 2017, Materials Research Society.…”

Section: Fabrication Strategiesmentioning

confidence: 99%

“…Aside from the above mentioned examples, NMFs have been also sporadically explored in other fields, including hydrogen storage, capacitors, flexible conductors, solar steam generation, and electromagnetic interference shielding . A few examples are specified in this section.…”

Section: Applicationsmentioning

confidence: 99%

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Engineering Self‐Supported Noble Metal Foams Toward Electrocatalysis and Beyond

Hübner

et al. 2019

Advanced Energy Materials

103

105

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Noble metals, despite their expensiveness, display irreplaceable roles in widespread fields. To acquire novel physicochemical properties and boost the performance‐to‐price ratio for practical applications, one core direction is to engineer noble metals into nanostructured porous networks. Noble metal foams (NMFs), featuring self‐supported, 3D interconnected networks structured from noble‐metal‐based building blocks, have drawn tremendous attention in the last two decades. Inheriting structural traits of foams and physicochemical properties of noble metals, NMFs showcase a variety of interesting properties and impressive prospect in diverse fields, including electrocatalysis, heterogeneous catalysis, surface‐enhanced Raman scattering, sensing and actuation, etc. A number of NMFs have been created and versatile synthetic approaches have been developed. However, because of the innate limitation of specific methods and the insufficient understanding of formation mechanisms, flexible manipulation of compositions, structures, and corresponding properties of NMFs are still challenging. Thus, the correlations between composition/structure and properties are seldom established, retarding material design/optimization for specific applications. This review is devoted to a comprehensive introduction of NMFs ranging from synthesis to applications, with an emphasis on electrocatalysis. Challenges and opportunities are also included to guide possible research directions in this field and promote the interest of interdisciplinary scientists.

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Fabrication and Characterization of Nanoporous Gold Electrodes for Sensor Applications

Francis

Knospe

2019

Adv Eng Mater

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Nanoporous gold electrodes are fabricated by etching white gold leaf in nitric acid. Samples of various thickness and alloy composition are used and etch time is varied. Electrode pore structure is characterized by scanning electron microscopy. Significant coarsening of ligament and pore structure is observed as etching time is varied from 5 to 90 min. Nanoporous gold electrode impedance is determined via electrochemical impedance spectroscopy. Test cells are constructed for this purpose consisting of two electrodes and an electrolyte. Both water and dichloroethane are examined as electrolyte solvents. A constant phase element with exponent greater than 0.9 is shown to provide an excellent description of interface impedance behavior for these test cells. Optimization is used to determine pseudo-capacitance and exponent in each case. A comparison of nanoporous gold electrode impedance to planar gold electrode impedance is made to derive the effective area of the nanoporous gold electrode. It is found in all cases that interfacial impedances are much lower (>40 Â) than those of conventional electrodes. Test results show that significant variations in effective area can occur depending on the electrolyte employed.

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Direct solution-based reduction synthesis of Au, Pd, and Pt aerogels

Abstract: Abstract

Cited by 55 publications

References 53 publications

Salt‐Templated Hierarchically Porous Platinum Macrotube Synthesis

Salt‐Templated Hierarchically Porous Platinum Macrotube Synthesis

Engineering Self‐Supported Noble Metal Foams Toward Electrocatalysis and Beyond

Fabrication and Characterization of Nanoporous Gold Electrodes for Sensor Applications

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