Experimental and Theoretical Insights into the Borohydride-Based Reduction-Induced Metal Interdiffusion in Fe-Oxide@NiCo2O4 for Enhanced Oxygen Evolution
- Title
- Experimental and Theoretical Insights into the Borohydride-Based Reduction-Induced Metal Interdiffusion in Fe-Oxide@NiCo2O4 for Enhanced Oxygen Evolution
- Author
- 이상욱
- Keywords
- bilayered Fe3O4/NiCo2O4, chemical reduction; metal interdiffusion; electrocatalytic water splitting; oxygen evolution reaction (OER)
- Issue Date
- 2021-11
- Publisher
- AMER CHEMICAL SOC
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v. 13, NO 45, Page. 53725-53735
- 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.
- URI
- https://pubs.acs.org/doi/10.1021/acsami.1c13694https://repository.hanyang.ac.kr/handle/20.500.11754/169740
- ISSN
- 19448244
- DOI
- 10.1021/acsami.1c13694
- Appears in Collections:
- COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY[E](과학기술융합대학) > CHEMICAL AND MOLECULAR ENGINEERING(화학분자공학과) > Articles
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