Stabilizing oxygen intermediates on redox-flexible active sites in multimetallic Ni-Fe-Al-Co layered double hydroxide anodes for excellent alkaline and seawater electrolysis

Development of an efficient and stable electrocatalyst for the oxygen evolution reaction (OER) is crucial to generate hydrogen via water splitting as a sustainable fuel. Nickel iron layered double hydroxides (NF-LDHs) are considered the most promising electrocatalysts for alkaline water oxidation am...

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Veröffentlicht in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2021-12, Vol.9 (48), p.27332-27346
Hauptverfasser: Enkhtuvshin, Enkhbayar, Kim, Kang Min, Kim, Young-Kwang, Mihn, Sungwook, Kim, So Jung, Jung, Sun Young, Thu Thao, Nguyen Thi, Ali, Ghulam, Akbar, Muhammad, Chung, Kyung Yoon, Chae, Keun Hwa, Kang, Sukhyun, Lee, Taeg Woo, Kim, Hyung Giun, Choi, Seunggun, Han, HyukSu
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container_issue 48
container_start_page 27332
container_title Journal of materials chemistry. A, Materials for energy and sustainability
container_volume 9
creator Enkhtuvshin, Enkhbayar
Kim, Kang Min
Kim, Young-Kwang
Mihn, Sungwook
Kim, So Jung
Jung, Sun Young
Thu Thao, Nguyen Thi
Ali, Ghulam
Akbar, Muhammad
Chung, Kyung Yoon
Chae, Keun Hwa
Kang, Sukhyun
Lee, Taeg Woo
Kim, Hyung Giun
Choi, Seunggun
Han, HyukSu
description Development of an efficient and stable electrocatalyst for the oxygen evolution reaction (OER) is crucial to generate hydrogen via water splitting as a sustainable fuel. Nickel iron layered double hydroxides (NF-LDHs) are considered the most promising electrocatalysts for alkaline water oxidation among various low-cost transition metal-based electrocatalysts although exact mechanisms are still on debate. Herein, we disclose that quaternary multimetallic Ni-Fe-Al-Co LDHs (NFAC-MELDHs) function as one of the best catalysts for alkaline as well as seawater oxidation due to the synergetic effects among the four different redox-flexible metals. The multimetallic Ni-Fe-Al-Co LDHs are prepared via the metal-organic framework (MOF)-derived electrochemical incorporation of fourth transition metal (Co) into ternary Ni-Fe-Al LDHs grown by a hydrothermal reaction. Moreover, we reveal an exact electrocatalytic mechanism for the OER in NFAC-MELDHs via ex situ spectroscopies in combination with density functional theory (DFT) calculations. Redox-flexible Fe is identified with a real active site in synergy with the neighboring metals stabilizing adsorption of oxygen intermediates and simultaneously facilitating charge transfer. In consequence, NFAC-MELDHs exhibit one of the lowest overpotentials of 220 and 280 mV for affording a current density of 100 mA cm −2 in alkaline and simulating seawater solutions, respectively. More importantly, activity and stability merits in electrocatalysis for the OER are improved in the sequence of unary, binary, ternary, and quaternary LDHs, implying that catalyst design using multimetals for LDHs is a highly promising strategy. Quaternary multimetallic LDHs have been developed through a facile metal-organic-framework derived electrochemical activation process. Ni-Fe-Al-Co quaternary LDHs show one of the best OER performances in alkaline and seawater electrolytes.
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Nickel iron layered double hydroxides (NF-LDHs) are considered the most promising electrocatalysts for alkaline water oxidation among various low-cost transition metal-based electrocatalysts although exact mechanisms are still on debate. Herein, we disclose that quaternary multimetallic Ni-Fe-Al-Co LDHs (NFAC-MELDHs) function as one of the best catalysts for alkaline as well as seawater oxidation due to the synergetic effects among the four different redox-flexible metals. The multimetallic Ni-Fe-Al-Co LDHs are prepared via the metal-organic framework (MOF)-derived electrochemical incorporation of fourth transition metal (Co) into ternary Ni-Fe-Al LDHs grown by a hydrothermal reaction. Moreover, we reveal an exact electrocatalytic mechanism for the OER in NFAC-MELDHs via ex situ spectroscopies in combination with density functional theory (DFT) calculations. Redox-flexible Fe is identified with a real active site in synergy with the neighboring metals stabilizing adsorption of oxygen intermediates and simultaneously facilitating charge transfer. In consequence, NFAC-MELDHs exhibit one of the lowest overpotentials of 220 and 280 mV for affording a current density of 100 mA cm −2 in alkaline and simulating seawater solutions, respectively. More importantly, activity and stability merits in electrocatalysis for the OER are improved in the sequence of unary, binary, ternary, and quaternary LDHs, implying that catalyst design using multimetals for LDHs is a highly promising strategy. Quaternary multimetallic LDHs have been developed through a facile metal-organic-framework derived electrochemical activation process. 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A, Materials for energy and sustainability</title><description>Development of an efficient and stable electrocatalyst for the oxygen evolution reaction (OER) is crucial to generate hydrogen via water splitting as a sustainable fuel. Nickel iron layered double hydroxides (NF-LDHs) are considered the most promising electrocatalysts for alkaline water oxidation among various low-cost transition metal-based electrocatalysts although exact mechanisms are still on debate. Herein, we disclose that quaternary multimetallic Ni-Fe-Al-Co LDHs (NFAC-MELDHs) function as one of the best catalysts for alkaline as well as seawater oxidation due to the synergetic effects among the four different redox-flexible metals. The multimetallic Ni-Fe-Al-Co LDHs are prepared via the metal-organic framework (MOF)-derived electrochemical incorporation of fourth transition metal (Co) into ternary Ni-Fe-Al LDHs grown by a hydrothermal reaction. Moreover, we reveal an exact electrocatalytic mechanism for the OER in NFAC-MELDHs via ex situ spectroscopies in combination with density functional theory (DFT) calculations. Redox-flexible Fe is identified with a real active site in synergy with the neighboring metals stabilizing adsorption of oxygen intermediates and simultaneously facilitating charge transfer. In consequence, NFAC-MELDHs exhibit one of the lowest overpotentials of 220 and 280 mV for affording a current density of 100 mA cm −2 in alkaline and simulating seawater solutions, respectively. More importantly, activity and stability merits in electrocatalysis for the OER are improved in the sequence of unary, binary, ternary, and quaternary LDHs, implying that catalyst design using multimetals for LDHs is a highly promising strategy. Quaternary multimetallic LDHs have been developed through a facile metal-organic-framework derived electrochemical activation process. 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A, Materials for energy and sustainability</jtitle><date>2021-12-14</date><risdate>2021</risdate><volume>9</volume><issue>48</issue><spage>27332</spage><epage>27346</epage><pages>27332-27346</pages><issn>2050-7488</issn><eissn>2050-7496</eissn><abstract>Development of an efficient and stable electrocatalyst for the oxygen evolution reaction (OER) is crucial to generate hydrogen via water splitting as a sustainable fuel. Nickel iron layered double hydroxides (NF-LDHs) are considered the most promising electrocatalysts for alkaline water oxidation among various low-cost transition metal-based electrocatalysts although exact mechanisms are still on debate. Herein, we disclose that quaternary multimetallic Ni-Fe-Al-Co LDHs (NFAC-MELDHs) function as one of the best catalysts for alkaline as well as seawater oxidation due to the synergetic effects among the four different redox-flexible metals. The multimetallic Ni-Fe-Al-Co LDHs are prepared via the metal-organic framework (MOF)-derived electrochemical incorporation of fourth transition metal (Co) into ternary Ni-Fe-Al LDHs grown by a hydrothermal reaction. Moreover, we reveal an exact electrocatalytic mechanism for the OER in NFAC-MELDHs via ex situ spectroscopies in combination with density functional theory (DFT) calculations. Redox-flexible Fe is identified with a real active site in synergy with the neighboring metals stabilizing adsorption of oxygen intermediates and simultaneously facilitating charge transfer. In consequence, NFAC-MELDHs exhibit one of the lowest overpotentials of 220 and 280 mV for affording a current density of 100 mA cm −2 in alkaline and simulating seawater solutions, respectively. 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source Royal Society Of Chemistry Journals 2008-
subjects Alkaline water
Aluminum
Catalysts
Charge transfer
Chemical analysis
Cobalt
Density functional theory
Electrocatalysts
Electrochemistry
Electrolysis
Heavy metals
Hydrothermal reactions
Hydroxides
Intermediates
Metal-organic frameworks
Metals
Nickel
Nickel iron
Oxidation
Oxygen
Oxygen evolution reactions
Seawater
Transition metals
Water analysis
Water splitting
title Stabilizing oxygen intermediates on redox-flexible active sites in multimetallic Ni-Fe-Al-Co layered double hydroxide anodes for excellent alkaline and seawater electrolysis
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