Unraveling the mechanism of enhanced oxygen evolution reaction using NiOx@Fe3O4 decorated on surface-modified carbon nanotubes

Advanced core@shell structures have emerged as an important strategy for enhancing performance and introducing novel functionalities across diverse scientific and engineering domains, facilitated by synergistic interactions between the core and shell. Particularly, when core@shell electrocatalysts a...

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Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2024-07, Vol.12 (28), p.17596-17606
Main Authors: Kim, Minju, Han, HyukSu, Lee, Kangpyo, Kang, Sukhyun, Sang-Hwa, Lee, Lee, Se Hun, Jeon, Hayun, Jeong Ho Ryu, Chan-Yeup Chung, Kim, Kang Min, Mhin, Sungwook
Format: Article
Language:English
Subjects:
Alkaline water
Carbon
Carbon nanotubes
Catalysts
Core-shell structure
Electrocatalysts
Electron transfer
Electronic structure
Iron oxides
Nanotechnology
Nanotubes
Oxygen evolution reactions
Performance enhancement
Synergistic effect
Water splitting
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Summary:Advanced core@shell structures have emerged as an important strategy for enhancing performance and introducing novel functionalities across diverse scientific and engineering domains, facilitated by synergistic interactions between the core and shell. Particularly, when core@shell electrocatalysts are applied to the oxygen evolution reaction (OER) in alkaline water splitting, they are promising for improving OER kinetics using economically feasible and readily available compounds, previously overlooked as electrocatalysts. As a representative study to demonstrate the synergistic effect of the core@shell structure on OER performance, we have developed a NiOx@Fe3O4 structure decorated on surface-modified carbon nanotubes. Experimental results exhibit outstanding OER performance, including an overpotential (η10) of 286 mV, a Tafel slope of 32 mV dec−1, and a faradaic efficiency of 97.2% during an 18-hour chronoamperometry test. Remarkably, this performance surpasses that of Fe3O4 catalysts (η10: 1266 mV, Tafel plot slope: 246.2 mV dec−1). Also, computational simulations reveal that the electronic structure modifications in NiOx@Fe3O4 promote electron transfer while significantly reducing the reaction energy barrier for boosting OER performance. This study offers scientific insights into the rational design of core@shell structures for enhanced OER performance, which have remained relatively unexplored.
ISSN:2050-7488
2050-7496
DOI:10.1039/d4ta02750g