scholarly journals Probing Individual Cuprous Oxide Microcrystals towards Carbon Dioxide Reduction by using In Situ Raman‐coupled Scanning Electrochemical Microscopy

2021 ◽  
Author(s):  
Matthias Steimecke ◽  
Ana María Araújo‐Cordero ◽  
Emil Dieterich ◽  
Michael Bron
Keyword(s):  
Carbon Dioxide ◽  
Cuprous Oxide ◽  
Scanning Electrochemical Microscopy ◽  
Carbon Dioxide Reduction ◽  
In Situ Raman ◽  
Electrochemical Microscopy

In-situ growth of Cu2O with honeycomb structure on roughed graphite paper for efficient electroreduction of CO2 to C2H4

2021 ◽  
Author(s):  
Zuoyu Yan ◽  
Xiuxiu Wang ◽  
Yang Tan ◽  
Aihua Liu ◽  
Fenqiang Luo ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Cuprous Oxide ◽  
Carbon Dioxide Reduction ◽  
Honeycomb Structure ◽  
Reduction Reaction ◽  
In Situ Growth

Metals and their alloys based electrocatalysts continue to attract great attention for electrochemical carbon dioxide reduction reaction (CO2RR). Herein, cuprous oxide (Cu2O) supported on N-doped flexible roughed graphite paper (NGP)...

In Situ Observation of Interface Evolution on a Graphite Anode by Scanning Electrochemical Microscopy

2020 ◽  
Vol 12 (33) ◽  
pp. 37047-37053
Author(s):  
Xiaojie Zeng ◽  
Dongqing Liu ◽  
Shuwei Wang ◽  
Shuai Liu ◽  
Xingke Cai ◽  
...  
Keyword(s):  
Scanning Electrochemical Microscopy ◽  
Graphite Anode ◽  
In Situ Observation ◽  
Interface Evolution ◽  
Electrochemical Microscopy

scholarly journals Probing the Speed Limits of Scanning Electrochemical Microscopy with In situ Colorimetric Imaging

2020 ◽  
Vol 7 (11) ◽  
pp. 2424-2432
Author(s):  
Anna E. Dorfi ◽  
Shijie Zhou ◽  
Alan C. West ◽  
John Wright ◽  
Daniel V. Esposito
Keyword(s):  
Scanning Electrochemical Microscopy ◽  
Speed Limits ◽  
Electrochemical Microscopy

scholarly journals On the Mechanism of Carbon Dioxide Reduction on Sn-Based Electrodes: Insights into the Role of Oxide Surfaces

Catalysts ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 636 ◽  
Author(s):  
Giane B. Damas ◽  
Caetano R. Miranda ◽  
Ricardo Sgarbi ◽  
James M. Portela ◽  
Mariana R. Camilo ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Electron Transfer ◽  
Formic Acid ◽  
Oxide Layer ◽  
Co2 Reduction ◽  
Carbon Dioxide Reduction ◽  
Oxide Surfaces ◽  
In Situ Conditions

The electrochemical reduction of carbon dioxide into carbon monoxide, hydrocarbons and formic acid has offered an interesting alternative for a sustainable energy scenario. In this context, Sn-based electrodes have attracted a great deal of attention because they present low price and toxicity, as well as high faradaic efficiency (FE) for formic acid (or formate) production at relatively low overpotentials. In this work, we investigate the role of tin oxide surfaces on Sn-based electrodes for carbon dioxide reduction into formate by means of experimental and theoretical methods. Cyclic voltammetry measurements of Sn-based electrodes, with different initial degree of oxidation, result in similar onset potentials for the CO2 reduction to formate, ca. −0.8 to −0.9 V vs. reversible hydrogen electrode (RHE), with faradaic efficiencies of about 90–92% at −1.25 V (vs. RHE). These results indicate that under in-situ conditions, the electrode surfaces might converge to very similar structures, with partially reduced or metastable Sn oxides, which serve as active sites for the CO2 reduction. The high faradaic efficiencies of the Sn electrodes brought by the etching/air exposition procedure is ascribed to the formation of a Sn oxide layer with optimized thickness, which is persistent under in situ conditions. Such oxide layer enables the CO2 “activation”, also favoring the electron transfer during the CO2 reduction reaction due to its better electric conductivity. In order to elucidate the reaction mechanism, we have performed density functional theory calculations on different slab models starting from the bulk SnO and Sn6O4(OH)4 compounds with focus on the formation of -OH groups at the water-oxide interface. We have found that the insertion of CO2 into the Sn-OH bond is thermodynamically favorable, leading to the stabilization of the tin-carbonate species, which is subsequently reduced to produce formic acid through a proton-coupled electron transfer process. The calculated potential for CO2 reduction (E = −1.09 V vs. RHE) displays good agreement with the experimental findings and, therefore, support the CO2 insertion onto Sn-oxide as a plausible mechanism for the CO2 reduction in the potential domain where metastable oxides are still present on the Sn surface. These results not only rationalize a number of literature divergent reports but also provide a guideline for the design of efficient CO2 reduction electrocatalysts.

On the Use of the Scanning Electrochemical Microscopy in Corrosion Research

2015 ◽  
Vol 228 ◽  
pp. 394-409 ◽  
Author(s):  
Bożena Łosiewicz ◽  
Magdalena Popczyk ◽  
Agnieszka Smołka ◽  
Magdalena Szklarska ◽  
Patrycja Osak ◽  
...  
Keyword(s):  
Surface Characterization ◽  
Scanning Electrochemical Microscopy ◽  
Basic Theory ◽  
The Past ◽  
Electrochemical Testing ◽  
Electrochemical Imaging ◽  
Active Research ◽  
Corrosion Research ◽  
Electrochemical Microscopy

This paper deals with the basic theory and the usability of Scanning Electrochemical Microscopy (SECM) in corrosion research. The SECM is thein situmethod of surface characterization which is based on the scanning of the tested surface using ultramicroelectrode and simultaneous electrochemical testing of the surface. This technique provides an electrochemical imaging of the surface. Key applications of SECM have been demonstrated based on the newest literature data covering the past two years of the active research in the field of corrosion in a nanoscale.

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