Promoted Overall Water Splitting Catalytic Activity and Durability of Ni3Fe Alloy by Designing N-Doped Carbon Encapsulation

Authors
Jeong, Dong InLee, Ui YoungKim, HyunchulBang, Hyeon-SeokChoi, Hyung WookKim, JiwonChoi, Hyuck GuOh, Hyung-SukKang, Bong KyunYoon, Dae Ho
Issue Date
2024-01
Publisher
Wiley - V C H Verlag GmbbH & Co.
Citation
Small
Abstract
Combining an electrochemically stable material onto the surface of a catalyst can improve the durability of a transition metal catalyst, and enable the catalyst to operate stably at high current density. Herein, the contribution of the N-doped carbon shell (NCS) to the electrochemical properties is evaluated by comparing the characteristics of the Ni3Fe@NCS catalyst with the N-doped carbon shell, and the Ni3Fe catalyst. The synthesized Ni3Fe@NCS catalyst has a distinct overpotential difference from the Ni3Fe catalyst (eta(OER) = 468.8 mV, eta(HER) = 462.2 mV) at (200 and -200) mA cm(-2) in 1 m KOH. In stability test at (10 and -10) mA cm(-2), the Ni3Fe@NCS catalyst showed a stability of (95.47 and 99.6)%, while the Ni3Fe catalyst showed a stability of (72.4 and 95.9)%, respectively. In addition, the in situ X-ray Absorption Near Edge Spectroscopy (XANES) results show that redox reaction appeared in the Ni3Fe catalyst by applying voltages of (1.7 and -0.48) V. The decomposition of nickel and iron due to the redox reaction is detected as a high ppm concentration in the Ni3Fe catalyst through Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES) analysis. This work presents the strategy and design of a next-generation electrochemical catalyst to improve the electrocatalytic properties and stability.
Keywords
OXYGEN EVOLUTION; METAL; NANOSHEETS; hydrogen evolution reaction; N-doped carbon shell; overall water splitting; oxygen evolution reaction; transition metal alloy
ISSN
1613-6810
URI
https://pubs.kist.re.kr/handle/201004/148542
DOI
10.1002/smll.202307830
Appears in Collections:
KIST Article > 2024
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