NDLI: Self-adsorption of an Ultrathin Bismuth Layer in the Size of Ions on an Au Surface

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Self-adsorption of an Ultrathin Bismuth Layer in the Size of Ions on an Au Surface

Content Provider	Springer Nature Link
Author	Ouyang, Lei Miao, Yuqing Xu, Lina Xiao, Mingshu Liang, Xiaocai Li, Weiwei Yang, Yang
Copyright Year	2014
Abstract	Molecular self-assembly is an important aspect of bottom-up approaches for the nanofabrication of functional materials. The self-assembly of smaller-size units like ions has yet to be studied further. The self-adsorption of Bi$^{III}$ without applied potential and electrochemical deposition of Bi/Bi$^{III}$ were studied and compared through cyclic voltammetry. Both of them exhibit two pairs of redox peaks assigned to the (2 × 2)-Bi adlayer and incommensurate (p × √3)-2 Bi adlayer. The adsorption of two Bi surface phases is related with the Bi salt concentration and adsorption time. Within a certain concentration or time range, the adsorption approaches to be saturated due to the surface limitation of self-adsorbed surface layers. The (2 × 2)-Bi adlayer firstly adsorbs to the active sites of Au where there is strong interaction between Bi and Au. With the increase of time, more Bi adsorbs onto the unoccupied sites of Au with a relatively weak interaction force to form a denser (p × √3)-2 Bi layer. A new pair of redox peaks appears for the electrodeposition of the Bi/Bi$^{III}$ bulky layer which is easily stripped from the Au surface through a consecutive potential scan. Comparatively speaking, the adsorbed (2 × 2) and (p × √3)-2 Bi adlayers are stable in the same potential scanning condition due to the strong interaction between the two surface Bi layers and the below Au atoms. Such a controllable self-adsorption of the Bi$^{III}$ ultrathin layer on foreign substrates exhibits a potential for the modification of materials in the size of ions.
Starting Page	211
Ending Page	219
Page Count	9
File Format	PDF
ISSN	18682529
Journal	Electrocatalysis
Volume Number	6
Issue Number	2
e-ISSN	18685994
Language	English
Publisher	Springer US
Publisher Date	2014-10-24
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Bismuth Underpotential deposition Adlayer Adatom Submonolayer Electrochemistry Physical Chemistry Catalysis Energy Technology
Content Type	Text
Resource Type	Article
Subject	Electrochemistry

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