Integration of a non-precious pyrolyzed Cu-doped ZIF as an oxygen depolarized cathode in an advanced chlor-alkali electrolyzer
Oxygen reduction is the critical step in advanced chlor-alkali electrolysis, which has motivated extensive research in catalyst development for improved efficiency and durability. This study investigates the oxygen reduction reaction (ORR) on Cu-based electrocatalysts supported on N-doped carbon (Cu...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Repositorio: | Recercat. Dipósit de la Recerca de Catalunya |
| OAI Identifier: | oai:recercat.cat:2445/220779 |
| Acceso en línea: | https://hdl.handle.net/2445/220779 |
| Access Level: | acceso abierto |
| Palabra clave: | Reacció d'oxidació-reducció Coure Electroquímica Oxidation-reduction reaction Copper Electrochemistry |
| Sumario: | Oxygen reduction is the critical step in advanced chlor-alkali electrolysis, which has motivated extensive research in catalyst development for improved efficiency and durability. This study investigates the oxygen reduction reaction (ORR) on Cu-based electrocatalysts supported on N-doped carbon (Cu/NC), derived from a Cu-modified zeolitic imidazolate framework (ZIF), and their ultimate performance in a chlor-alkali electrolyzer. Through comprehensive electrochemical characterization in 0.1 M NaOH solution, values of <em>E</em><sub>onset</sub> = 0.87 V and <em>E</em><sub>1/2</sub> = 0.75 V (vs. RHE) were obtained, which are competitive with commercial Pt/C despite the superior <em>j</em> achieved by the latter in LSV tests. The electron transfer number (<em>n</em>) of the optimum Cu/NC was 4, very close tobenchmark catalyst Pt/C 20 wt.% (<em>n</em> = 3.94). Cu/NC had a low Tafel slope (128 mV dec<sup>-1</sup>), thus speeding up the ORR on this nanocatalyst. Additionally, chronoamperometry and accelerated durability tests demonstrated the long-term stability of Cu/NC for 10 h. The catalyst was assembled as an oxygen depolarized cathode (ODC) in a purpose-designed advanced chlor-alkali electrolyzer, resulting in a cell voltage of 2.1 V at 1 kA m<sup>-2</sup> and 80 ºC, which underscores the potential of Cu-based nanocatalysts in electrochemical energy devices. This research serves to leverage insights for the use of advanced electrocatalysts to enhance the efficiency and sustainability of chlor-alkali electrolysis. |
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