Time-evolution of structures of quenched Pt(111) electrode surfaces upon potential cycling

1991 ◽  
Vol 88 ◽  
pp. 1381-1400 ◽  
Author(s):  
G Jerkiewicz ◽  
BE Conway
Keyword(s):  
Time Evolution ◽  
Potential Cycling ◽  
Electrode Surfaces

scholarly journals Electrochemical Restructuring of Copper Surfaces Using Organic Additives and Its Effect on the Electrocatalytic Reduction of Nitrate Ions

2015 ◽  
Vol 68 (8) ◽  
pp. 1213 ◽  
Author(s):  
Ali Balkis ◽  
Anthony P. O'Mullane
Keyword(s):  
Phenylacetic Acid ◽  
Surface Oxidation ◽  
Organic Additives ◽  
Potential Cycling ◽  
Copper Surfaces ◽  
Nitrate Ions ◽  
Electrode Surfaces ◽  
Copper Electrodes ◽  
Electrocatalytic Performance ◽  
Simple Potential

This work describes the fabrication of nanostructured copper electrodes using a simple potential cycling protocol that involves oxidation and reduction of the surface in an alkaline solution. It was found that the inclusion of additives, such as benzyl alcohol and phenylacetic acid, has a profound effect on the surface oxidation process and the subsequent reduction of these oxides. This results in not only a morphology change, but also affects the electrocatalytic performance of the electrode for the reduction of nitrate ions. In all cases, the electrocatalytic performance of the restructured electrodes was significantly enhanced compared with the unmodified electrode. The most promising material was formed when phenylacetic acid was used as the additive. In addition, the reduction of residual oxides on the surface after the modification procedure to expose freshly active reaction sites on the surface before nitrate reduction was found to be a significant factor in dictating the overall electrocatalytic activity. It is envisaged that this approach offers an interesting way to fabricate other nanostructured electrode surfaces.

scholarly journals Potential Dependent Structure and Stability of Cu(111) in Neutral Phosphate Electrolyte

Surfaces ◽  
2019 ◽  
Vol 2 (1) ◽  
pp. 145-158 ◽  
Author(s):  
Yvonne Grunder ◽  
Jack Beane ◽  
Adam Kolodziej ◽  
Christopher Lucas ◽  
Paramaconi Rodriguez
Keyword(s):  
Underlying Mechanism ◽  
Copper Surface ◽  
Copper Electrode ◽  
Phosphate Adsorption ◽  
X Ray Diffraction ◽  
Potential Cycling ◽  
Electrode Surfaces ◽  
History Of ◽  
The Stability ◽  
Reduction Of Co2

Copper and copper oxide electrode surfaces are suitable for the electrochemical reduction of CO2 and produce a range of products, with the product selectivity being strongly influenced by the surface structure of the copper electrode. In this paper, we present in-situ surface X-ray diffraction studies on Cu(111) electrodes in neutral phosphate buffered electrolyte solution. The underlying mechanism of the phosphate adsorption and deprotonation of the (di)-hydrogen phosphate is accompanied by a roughening of the copper surface. A change in morphology of the copper surface induced by a roughening process caused by the formation of a mixed copper–oxygen layer could also be observed. The stability of the Cu(111) surface and the change of morphology upon potential cycling strongly depends on the preparation method and history of the electrode. The presence of copper islands on the surface of the Cu(111) electrode leads to irreversible changes in surface morphology via a 3D Cu growth mechanism.

The Plasma Technology for Shaping the Electric Pacemaker Electrode Surfaces Coated with Ruthenium

Vestnik MEI ◽  
2019 ◽  
Vol 6 ◽  
pp. 64-70
Author(s):  
Yuriy V. Martynenko ◽  
◽  
Vyacheslav P. Budaev ◽  
Keyword(s):  
Plasma Technology ◽  
Electrode Surfaces

Host-Guest Interactions on Electrode Surfaces for Immobilization of Molecular Catalysts

2020 ◽  
Author(s):  
Laurent Sévery ◽  
Jacek Szczerbiński ◽  
Mert Taskin ◽  
Isik Tuncay ◽  
Fernanda Brandalise Nunes ◽  
...  
Keyword(s):  
Aqueous Media ◽  
Heterogeneous Systems ◽  
Catalytic Systems ◽  
New Approach ◽  
Molecular Systems ◽  
Electrode Surfaces ◽  
Catalytic Surfaces ◽  
Oxide Electrodes ◽  
The Stability ◽  
Molecular Catalysts

The strategy of anchoring molecular catalysts on electrode surfaces combines the high selectivity and activity of molecular systems with the practicality of heterogeneous systems. The stability of molecular catalysts is, however, far less than that of traditional heterogeneous electrocatalysts, and therefore a method to easily replace anchored molecular catalysts that have degraded could make such electrosynthetic systems more attractive. Here, we apply a non-covalent “click” chemistry approach to reversibly bind molecular electrocatalysts to electrode surfaces via host-guest complexation with surface-anchored cyclodextrins. The host-guest interaction is remarkably strong and allows the flow of electrons between the electrode and the guest catalyst. Electrosynthesis in both organic and aqueous media was demonstrated on metal oxide electrodes, with stability on the order of hours. The catalytic surfaces can be recycled by controlled release of the guest from the host cavities and readsorption of fresh guest. This strategy represents a new approach to practical molecular-based catalytic systems.

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