Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/163405
Title: Tuning electronic structure and composition of FeNi nanoalloys for enhanced oxygen evolution electrocatalysis via a general synthesis strategy
Authors: Wang, Yong
Nong, Wei
Gong, Na
Salim, Teddy
Luo, Mingchuan
Tan, Teck Leong
Hippalgaonkar, Kedar
Liu, Zheng
Huang, Yizhong
Keywords: Engineering::Materials
Issue Date: 2022
Source: Wang, Y., Nong, W., Gong, N., Salim, T., Luo, M., Tan, T. L., Hippalgaonkar, K., Liu, Z. & Huang, Y. (2022). Tuning electronic structure and composition of FeNi nanoalloys for enhanced oxygen evolution electrocatalysis via a general synthesis strategy. Small, 18(41), 2203340-. https://dx.doi.org/10.1002/smll.202203340
Project: FG79/20
A1898b0043
NRFNRFF13-2021-001
Journal: Small
Abstract: Developing low-cost and efficient oxygen evolution electrocatalysts is key to decarbonization. A facile, surfactant-free, and gram-level biomass-assisted fast heating and cooling synthesis method is reported for synthesizing a series of carbon-encapsulated dense and uniform FeNi nanoalloys with a single-phase face-centered-cubic solid-solution crystalline structure and an average particle size of sub-5 nm. This method also enables precise control of both size and composition. Electrochemical measurements show that among Fex Ni(1- x ) nanoalloys, Fe0.5 Ni0.5 has the best performance. Density functional theory calculations support the experimental findings and reveal that the optimally positioned d-band center of O-covered Fe0.5 Ni0.5 renders a half-filled antibonding state, resulting in moderate binding energies of key reaction intermediates. By increasing the total metal content from 25 to 60 wt%, the 60% Fe0.5 Ni0.5 /40% C shows an extraordinarily low overpotential of 219 mV at 10 mA cm-2 with a small Tafel slope of 23.2 mV dec-1 for the oxygen evolution reaction, which are much lower than most other FeNi-based electrocatalysts and even the state-of-the-art RuO2 . It also shows robust durability in an alkaline environment for at least 50 h. The gram-level fast heating and cooling synthesis method is extendable to a wide range of binary, ternary, quaternary nanoalloys, as well as quinary and denary high-entropy-alloy nanoparticles.
URI: https://hdl.handle.net/10356/163405
ISSN: 1613-6810
DOI: 10.1002/smll.202203340
Rights: © 2022 Wiley-VCH GmbH. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:EEE Journal Articles
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