Jump to main content
Jump to site search


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

Author affiliations

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.

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

Back to tab navigation

Supplementary files

Publication details

The article was received on 27 Sep 2017, accepted on 21 Nov 2017 and first published on 23 Nov 2017


Article type: Paper
DOI: 10.1039/C7TA08562A
Citation: J. Mater. Chem. A, 2018, Advance Article
  •   Request permissions

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

    M. U.-B. Christiansen, N. Seselj, C. Engelbrekt, M. Wagner, F. N. Stappen and J. Zhang, J. Mater. Chem. A, 2018, Advance Article , DOI: 10.1039/C7TA08562A

Search articles by author

Spotlight

Advertisements