Chemically controlled interfacial nanoparticle assembly into nanoporous gold films for electrochemical applications

Research output: Contribution to journalJournal article – Annual report year: 2018Researchpeer-review

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Chemically controlled interfacial nanoparticle assembly into nanoporous gold films for electrochemical applications. / Christiansen, Mikkel U. -B.; Seselj, Nedjeljko; Engelbrekt, Christian; Wagner, Michal; Stappen, Frederick N.; Zhang, Jingdong.

In: Journal of Materials Chemistry A, Vol. 6, No. 2, 2018, p. 556-564.

Research output: Contribution to journalJournal article – Annual report year: 2018Researchpeer-review

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@article{6e415a8326f7445790a3fc00d43ef066,
title = "Chemically controlled interfacial nanoparticle assembly into nanoporous gold films for electrochemical applications",
abstract = "Nanoporous gold (NPG) is an effective material for electrocatalysis and can be made via a dealloy method such as etching of silver–gold alloys. Dealloyed NPG may contain residual silver that affects its catalytic performance. Herein, a different approach has been reported for the formation of NPG at the liquid/air interface starting from gold nanoparticles (AuNPs) in an aqueous solution, providing silver-free gold films. Chloroauric acid is reduced to AuNP building blocks by 2-(N-morpholino)ethanesulfonic acid, which also acts as a protecting agent and pH buffer. By adding potassium chloride before AuNP synthesis and hydrochloric acid to the resultant AuNP solutions, we can reproducibly obtain continuous gold networks. The sintered AuNPs produced by this method result in chemically synthesized nanoporous gold films (cNPGFs) that resemble dealloyed NPG in terms of morphology and porosity; additionally, they can be controlled by varying the temperature, chloride concentration, ionic strength, and protonation of the buffer. cNPGF formation is attributed to the destabilization of AuNPs at the air–liquid interface. The developed method generates electrochemically stable cNPGFs up to 20 cm2 in size with an average thickness of 500 ± 200 nm, areal density of 50–150 μg cm−2, and porosity as high as 85{\%}. Importantly, cNPGFs can effectively catalyze both CO2 reduction and CO oxidation electrochemically. Thus, the developed synthetic method offers large-scale production of pure bottom-up NPGFs for multifarious electrocatalytic applications",
author = "Christiansen, {Mikkel U. -B.} and Nedjeljko Seselj and Christian Engelbrekt and Michal Wagner and Stappen, {Frederick N.} and Jingdong Zhang",
year = "2018",
doi = "10.1039/c7ta08562a",
language = "English",
volume = "6",
pages = "556--564",
journal = "Journal of Materials Chemistry A",
issn = "2050-7488",
publisher = "RSC Publications",
number = "2",

}

RIS

TY - JOUR

T1 - Chemically controlled interfacial nanoparticle assembly into nanoporous gold films for electrochemical applications

AU - Christiansen, Mikkel U. -B.

AU - Seselj, Nedjeljko

AU - Engelbrekt, Christian

AU - Wagner, Michal

AU - Stappen, Frederick N.

AU - Zhang, Jingdong

PY - 2018

Y1 - 2018

N2 - Nanoporous gold (NPG) is an effective material for electrocatalysis and can be made via a dealloy method such as etching of silver–gold alloys. Dealloyed NPG may contain residual silver that affects its catalytic performance. Herein, a different approach has been reported for the formation of NPG at the liquid/air interface starting from gold nanoparticles (AuNPs) in an aqueous solution, providing silver-free gold films. Chloroauric acid is reduced to AuNP building blocks by 2-(N-morpholino)ethanesulfonic acid, which also acts as a protecting agent and pH buffer. By adding potassium chloride before AuNP synthesis and hydrochloric acid to the resultant AuNP solutions, we can reproducibly obtain continuous gold networks. The sintered AuNPs produced by this method result in chemically synthesized nanoporous gold films (cNPGFs) that resemble dealloyed NPG in terms of morphology and porosity; additionally, they can be controlled by varying the temperature, chloride concentration, ionic strength, and protonation of the buffer. cNPGF formation is attributed to the destabilization of AuNPs at the air–liquid interface. The developed method generates electrochemically stable cNPGFs up to 20 cm2 in size with an average thickness of 500 ± 200 nm, areal density of 50–150 μg cm−2, and porosity as high as 85%. Importantly, cNPGFs can effectively catalyze both CO2 reduction and CO oxidation electrochemically. Thus, the developed synthetic method offers large-scale production of pure bottom-up NPGFs for multifarious electrocatalytic applications

AB - Nanoporous gold (NPG) is an effective material for electrocatalysis and can be made via a dealloy method such as etching of silver–gold alloys. Dealloyed NPG may contain residual silver that affects its catalytic performance. Herein, a different approach has been reported for the formation of NPG at the liquid/air interface starting from gold nanoparticles (AuNPs) in an aqueous solution, providing silver-free gold films. Chloroauric acid is reduced to AuNP building blocks by 2-(N-morpholino)ethanesulfonic acid, which also acts as a protecting agent and pH buffer. By adding potassium chloride before AuNP synthesis and hydrochloric acid to the resultant AuNP solutions, we can reproducibly obtain continuous gold networks. The sintered AuNPs produced by this method result in chemically synthesized nanoporous gold films (cNPGFs) that resemble dealloyed NPG in terms of morphology and porosity; additionally, they can be controlled by varying the temperature, chloride concentration, ionic strength, and protonation of the buffer. cNPGF formation is attributed to the destabilization of AuNPs at the air–liquid interface. The developed method generates electrochemically stable cNPGFs up to 20 cm2 in size with an average thickness of 500 ± 200 nm, areal density of 50–150 μg cm−2, and porosity as high as 85%. Importantly, cNPGFs can effectively catalyze both CO2 reduction and CO oxidation electrochemically. Thus, the developed synthetic method offers large-scale production of pure bottom-up NPGFs for multifarious electrocatalytic applications

U2 - 10.1039/c7ta08562a

DO - 10.1039/c7ta08562a

M3 - Journal article

VL - 6

SP - 556

EP - 564

JO - Journal of Materials Chemistry A

JF - Journal of Materials Chemistry A

SN - 2050-7488

IS - 2

ER -