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890681.pdf (5.63 MB)

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2025-02-25

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cc-by-nc-nd (c) Shaldehi, Tahereh Jangjooye et al., 2025
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/220779

Integration of a non-precious pyrolyzed Cu-doped ZIF as an oxygen depolarized cathode in an advanced chlor-alkali electrolyzer

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https://doi.org/10.1016/j.electacta.2025.145929

Resum

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 Eonset = 0.87 V and E1/2 = 0.75 V (vs. RHE) were obtained, which are competitive with commercial Pt/C despite the superior j achieved by the latter in LSV tests. The electron transfer number (n) of the optimum Cu/NC was 4, very close tobenchmark catalyst Pt/C 20 wt.% (n = 3.94). Cu/NC had a low Tafel slope (128 mV dec-1), 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-2 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.

Matèries

Reacció d'oxidació-reducció, Coure, Electroquímica

Matèries (anglès)

Oxidation-reduction reaction, Copper, Electrochemistry

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Col·leccions

Articles publicats en revistes (Ciència dels Materials i Química Física)
Articles publicats en revistes (Institut de Nanociència i Nanotecnologia (IN2UB))

Citació

SHALDEHI, Tahereh Jangjooye, et al. Integration of a non-precious pyrolyzed Cu-doped ZIF as an oxygen depolarized cathode in an advanced chlor-alkali electrolyzer. Electrochimica Acta. 2025. Vol. 522, num. 1-11. ISSN 0013-4686. [consulted: 12 of August of 2026]. Available at: https://hdl.handle.net/2445/220779

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