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High entropy layered double hydroxide supported by multiwall carbon nanotube for oxygen evolution reactions (OER).

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Title: High entropy layered double hydroxide supported by multiwall carbon nanotube for oxygen evolution reactions (OER).
Authors: Wondimu, Tadele Hunde1,2 (AUTHOR), Leung, Puiki1 (AUTHOR) p.leung@cqu.edu.cn, Zuo, Yong1,3 (AUTHOR) zuoyong@kpicn.cn, Shah, Akeel1 (AUTHOR), Liao, Qiang1 (AUTHOR)
Source: Journal of Power Sources. Jun2025, Vol. 640, pN.PAG-N.PAG. 1p.
Subjects: Oxygen evolution reactions, Layered double hydroxides, Overpotential, Entropy, Catalysts, Carbon nanotubes
Abstract: This study presents a novel catalyst that comprising of high entropy layered double hydroxide supported by multiwall carbon nanotube (FeAlNiCoMn-HE-LDH/CNT) which exhibits exceptional catalytic efficacy for the oxygen evolution reaction (OER) in a pH∼14, 1.0 M KOH solution. The synthesis of FeAlNiCoMn-HE-LDH/CNT involved a simple hydrothermal process by combining nitrate precursor solutions of Fe3+, Al3+, Ni2+, Co2+ and Mn2+ with piranha treated multiwall carbon nanotubes (O-MWCNT). The as synthesized FeAlNiCoMn-HE-LDH/CNT exhibited an overpotential of 243 mV to reach a current density of 10 mA cm−2, surpassing the performance of IrO 2 and exhibiting the lowest Tafel slope of 46.54 mV dec−1. Durability tests showed a negligible decrease in current density by ∼1.5 % after ∼250 h at 150 mA cm−2 and a slight increase by ∼2 % at 10 mA cm−2 over the same period and FeAlNiCoMn-HE-LDH/CNT found to be among the best catalyst of OER from the reported value. The exceptional performance and robustness of FeAlNiCoMn-HE-LDH/CNT for OER can be attributed to the synergistic effects between FeAlNiCoMn-HE-LDH and O-MCNT which enhancing the overall electrochemical activities of FeAlNiCoMn-HE-LDH/CNT. [Display omitted] • FeAlNiCoMn-HE-LDH/CNT was synthesized by simple hydrothermal method. • MWCNT was Oxidized by piranha solutions by stirring it for 5 h. • FeAlNiCoMn-HE-LDH/CNT was tested for OER and 243 mV at 10 mAcm−2 was attained. • FeAlNiCoMn-HE-LDH/CNT was stable in 1.0 M KOH for 250 h at 150 mAcm−2. • Synergistic effect of FeAlNiCoMn-HE-LDH and MWCNT enhances OER performance. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:This study presents a novel catalyst that comprising of high entropy layered double hydroxide supported by multiwall carbon nanotube (FeAlNiCoMn-HE-LDH/CNT) which exhibits exceptional catalytic efficacy for the oxygen evolution reaction (OER) in a pH∼14, 1.0 M KOH solution. The synthesis of FeAlNiCoMn-HE-LDH/CNT involved a simple hydrothermal process by combining nitrate precursor solutions of Fe3+, Al3+, Ni2+, Co2+ and Mn2+ with piranha treated multiwall carbon nanotubes (O-MWCNT). The as synthesized FeAlNiCoMn-HE-LDH/CNT exhibited an overpotential of 243 mV to reach a current density of 10 mA cm−2, surpassing the performance of IrO 2 and exhibiting the lowest Tafel slope of 46.54 mV dec−1. Durability tests showed a negligible decrease in current density by ∼1.5 % after ∼250 h at 150 mA cm−2 and a slight increase by ∼2 % at 10 mA cm−2 over the same period and FeAlNiCoMn-HE-LDH/CNT found to be among the best catalyst of OER from the reported value. The exceptional performance and robustness of FeAlNiCoMn-HE-LDH/CNT for OER can be attributed to the synergistic effects between FeAlNiCoMn-HE-LDH and O-MCNT which enhancing the overall electrochemical activities of FeAlNiCoMn-HE-LDH/CNT. [Display omitted] • FeAlNiCoMn-HE-LDH/CNT was synthesized by simple hydrothermal method. • MWCNT was Oxidized by piranha solutions by stirring it for 5 h. • FeAlNiCoMn-HE-LDH/CNT was tested for OER and 243 mV at 10 mAcm−2 was attained. • FeAlNiCoMn-HE-LDH/CNT was stable in 1.0 M KOH for 250 h at 150 mAcm−2. • Synergistic effect of FeAlNiCoMn-HE-LDH and MWCNT enhances OER performance. [ABSTRACT FROM AUTHOR]
ISSN:03787753
DOI:10.1016/j.jpowsour.2025.236665