Experimental and Theoretical Insights into the Borohydride-Based Reduction-Induced Metal Interdiffusion in Fe-Oxide@NiCo2O4 for Enhanced Oxygen Evolution
- Authors
- Jo, Yongcheol; Cho, Sangeun; Seo, Jiwoo; Ahmed, Abu Talha Aqueel; Lee, Chi Ho; Seok, Jun Ho; Hou, Bo; Patil, Supriya A.; Park, Youngsin; Shrestha, Nabeen K.; Lee, Sang Uck; Kim, Hyungsang; Im, Hyunsik
- Issue Date
- Nov-2021
- Publisher
- American Chemical Society
- Keywords
- bilayered Fe3O4/NiCo2O4; chemical reduction; electrocatalytic water splitting; metal interdiffusion; oxygen evolution reaction (OER)
- Citation
- ACS Applied Materials and Interfaces, v.13, no.45, pp.53725 - 53735
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS Applied Materials and Interfaces
- Volume
- 13
- Number
- 45
- Start Page
- 53725
- End Page
- 53735
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/111023
- DOI
- 10.1021/acsami.1c13694
- ISSN
- 1944-8244
- Abstract
- The oxygen evolution reaction (OER) plays a key role in determining the performance of overall water splitting, while a core technological consideration is the development of cost-effective, efficient, and durable catalysts. Here, we demonstrate a robust reduced Fe-oxide@NiCo2O4 bilayered non-precious-metal oxide composite as a highly efficient OER catalyst in an alkaline medium. A bilayered oxide composite film with an interconnected nanoflake morphology (Fe2O3@NiCo2O4) is reduced in an aqueous NaBH4 solution, which results in a mosslike Fe3O4@NiCo2O4 (reduced Fe-oxide@NiCo2O4; rFNCO) nanostructured film with an enhanced electrochemical surface area. The rFNCO film demonstrates an outstanding OER activity with an extraordinary low overpotential of 189 mV at 10 mA cm-2 (246 mV at 100 mA cm-2) and a remarkably small Tafel slope of 32 mV dec-1. The film also shows excellent durability for more than 50 h of continuous operation, even at 100 mA cm-2. Furthermore, density functional theory calculations suggest that the unintentionally in situ doped Ni during the reduction reaction possibly improves the OER performance of the rFNCO catalyst shifting d-band centers of both Fe and Ni active sites. © 2021 American Chemical Society.
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