Microwave sintered porous CoCrFeNiMo high entropy alloy as an efficient electrocatalyst for alkaline oxygen evolution reaction. (20th July 2021)

• Record Type: Journal Article
• Authors: Tang, J.; Xu, J.L.; Ye, Z.G.; Li, X.B.; Luo, J.M.
• Is Part Of: Journal of materials science & technology. Volume 79(2021)
• Page Start: 171
• Page End: 177
• Publication Date: 2021-07-20
• Subjects: CoCrFeNiMo -- High entropy alloys -- Electrocatalysts -- Oxygen evolution reaction -- Microwave sintering -- Mg space holder; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2020.10.079
• Languages: English
• ISSNs: 1005-0302

Abstract

Graphical abstract: Highlights: The porous CoCrFeNiMo HEAs used as electrocatalyst are prepared by microwave sintering. The porous CoCrFeNiMo HEAs exhibit excellent catalytic activity and stability. The porous structure improves the electron transfer rates and exposes more active sites. The high OER activity is due to the crystal defects, nanosheets and large active surface area. Abstract: Developing efficient, stable and economical electrocatalyst for oxygen evolution reaction (OER) is a significant pathway to produce clean energy from water splitting. Herein, the promising and highly efficient porous CoCrFeNiMo high entropy alloys (HEAs) were prepared by microwave sintering using Mg space holder. Owing to unique properties of high entropy alloys and abundant active surface area, the porous CoCrFeNiMo-20 Mg exhibits excellent catalytic performance and prominent electrochemical stability with a low overpotential of 220 mV to reach current density of 10 mA cm −2, a small Tafel slope of 59.0 mV dec -1 and long-term durability for 24 h in 1.0 M KOH. The results of microstructure and element states indicate that crystal defects, porous structure and villous hydroxides are the reasons for high OER performance of the CoCrFeNiMo. This work not only provides a new way to prepare electrocatalysts, but also proves the important application of high entropy alloys in functional materials.