Spectroelectrochemical Experiment for Studying Water Oxidation with a Nickel Oxide Catalyst
| Autor: | Diego González-Flores, Roberto Urcuyo, Gabriela Fernández |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Tafel equation
Materials science 010405 organic chemistry Nickel oxide 05 social sciences 050301 education General Chemistry Electrocatalyst Electrochemistry 01 natural sciences 0104 chemical sciences Education Catalysis Chemical engineering Water splitting Absorption (electromagnetic radiation) 0503 education Hydrogen production |
| Zdroj: | Journal of Chemical Education. 98:607-613 |
| ISSN: | 1938-1328 0021-9584 |
| DOI: | 10.1021/acs.jchemed.0c00265 |
| Popis: | Electrochemical and spectroelectrochemical techniques are very important for characterizing energy materials. In the search for new sources of renewable energy, water splitting for hydrogen production and CO2 reduction is attracting significant attention. These applications require efficient and durable catalysts and a detailed understanding of the underlying catalytic mechanism. Here, we experimentally study electrodeposited nickel oxide as a catalyst for electrochemical water oxidation by combining UV–vis and electrochemical techniques, with emphasis on revealing the interplay between catalytic activity and physical changes in the catalyst. Specifically, the spectroelectrochemical characterization of the catalyst at different pH enables students to establish correlations between catalytic activity, pH, and physical changes in the catalyst. Students are also introduced to fundamental principles of electrocatalysis such as Tafel plots, TOF (turnover frequency), and midpoint potential. Moreover, they are guided toward the reliable interpretation of optical absorption and electrochemical data, along with the conceptual aspects behind these techniques. |
| Databáze: | OpenAIRE |
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