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Study on the oxygen catalytic property of CZIF-67/NiCo2O4 composite.
- Source :
- Ionics; Jan2024, Vol. 30 Issue 1, p479-489, 11p
- Publication Year :
- 2024
-
Abstract
- Developing an efficient electrocatalyst for the oxygen electrode is a significant challenge in the field. In this study, Co–N co-doped carbon (denoted as CZIF-67) is used as modifier to enhance the catalytic activity of the spinel oxide NiCo<subscript>2</subscript>O<subscript>4</subscript>. Among all the catalysts synthesized, the composite catalyst containing 10% CZIF-67 (where CZIF-67 constitutes 10% of the total mass) exhibits the highest catalytic activity for both the oxygen evolution reaction and the oxygen reduction reaction. This is evidenced by the largest current densities of 275.6 mA·cm<superscript>−2</superscript> and 235.6 mA·cm<superscript>−2</superscript> at the cutoff voltage of 1.9268 V (vs. RHE) and 0.3268V (vs. RHE). XPS characterization showed the surface element composition and valence analysis of 10% CZIF-67, which revealed the synergistic reaction between CZIF-67 and NiCo<subscript>2</subscript>O<subscript>4</subscript> to a certain extent. Electrochemical impedance spectroscopy (EIS) results indicate that the charge transfer resistance of 10% CZIF-67 catalyst is the lowest, suggesting a faster charge transfer rate. It can be attributed to the synergistic effects between appropriate amount of CZIF-67 and the spinel oxide NiCo<subscript>2</subscript>O<subscript>4</subscript>. Additionally, the large specific surface and the porous structure of CZIF-67 can provide more active sites for the reactions. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09477047
- Volume :
- 30
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Ionics
- Publication Type :
- Academic Journal
- Accession number :
- 174761136
- Full Text :
- https://doi.org/10.1007/s11581-023-05297-0