Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 45, Pages 53725-53735Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c13694
Keywords
bilayered Fe3O4/NiCo2O4; chemical reduction; metal interdiffusion; electrocatalytic water splitting; oxygen evolution reaction (OER)
Funding
- National Research Foundation (NRF) of Korea [2018R1D1A1B07049046, 2021R1A2B5B01001796, 2021R1A4A5031805]
- National Research Foundation of Korea [5199990214171] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The study presents a highly efficient and durable catalyst for oxygen evolution reaction, with a unique structure showing outstanding catalytic performance in an alkaline medium.
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.
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