Optimization of Ni−Co−Fe-Based Catalysts for Oxygen Evolution Reaction by Surface and Relaxation Phenomena Analysis

Rinat Attias; Kalimuthu Vijaya Sankar; Kapil Dhaka; Wenjamin Moschkowitsch; Lior Elbaz; Maytal Caspary Toroker; Yoed Tsur

doi:10.1002/cssc.202002946

Optimization of Ni−Co−Fe-Based Catalysts for Oxygen Evolution Reaction by Surface and Relaxation Phenomena Analysis

Rinat Attias, Kalimuthu Vijaya Sankar, Kapil Dhaka, Wenjamin Moschkowitsch, Lior Elbaz, Maytal Caspary Toroker, Yoed Tsur

Department of Chemistry

Technion-Israel Institute of Technology

Research output: Contribution to journal › Article › peer-review

26 Scopus citations

Abstract

Trimetallic double hydroxide NiFeCo−OH is prepared by coprecipitation, from which three different catalysts are fabricated by different heat treatments, all at 350 °C maximum temperature. Among the prepared catalysts, the one prepared at a heating and cooling rate of 2 °C min⁻¹ in N₂ atmosphere (designated NiFeCo−N₂-2 °C) displays the best catalytic properties after stability testing, exhibiting a high current density (9.06 mA cm⁻² at 320 mV), low Tafel slope (72.9 mV dec⁻¹), good stability (over 20 h), high turnover frequency (0.304 s⁻¹), and high mass activity (46.52 A g⁻¹ at 320 mV). Stability tests reveal that the hydroxide phase is less suitable for long-term use than catalysts with an oxide phase. Two causes are identified for the loss of stability in the hydroxide phase: a) Modeling of the distribution function of relaxation times (DFRT) reveals the increase in resistance contributed by various relaxation processes; b) density functional theory (DFT) surface energy calculations reveal that the higher surface energy of the hydroxide-phase catalyst impairs the stability. These findings represent a new strategy to optimize catalysts for water splitting.

Original language	English
Pages (from-to)	1737-1746
Number of pages	10
Journal	ChemSusChem
Volume	14
Issue number	7
DOIs	https://doi.org/10.1002/cssc.202002946
State	Published - 9 Apr 2021

Bibliographical note

Publisher Copyright:
© 2021 Wiley-VCH GmbH

Funding

Financial support of the Ministry of energy and water, Israel, the Israel National Research Center for Electrochemical Propulsion (INREP) and the Grand Technion Energy Program (GTEP) are gratefully acknowledged. R.A. wishes to thank the generous support of the Leonard and Diane Sherman Interdisciplinary Graduate School Fellowship. K. V. wishes to thank the generous support of the Technion‐Israel Institute of Technology postdoctoral fellowship as well as the UConn‐GTEP joint program. We thank Noam Zion of BIU for XPS and Gennady Shter of Technion for TGA\DTA. Financial support of the Ministry of energy and water, Israel, the Israel National Research Center for Electrochemical Propulsion (INREP) and the Grand Technion Energy Program (GTEP) are gratefully acknowledged. R.A. wishes to thank the generous support of the Leonard and Diane Sherman Interdisciplinary Graduate School Fellowship. K. V. wishes to thank the generous support of the Technion-Israel Institute of Technology postdoctoral fellowship as well as the UConn-GTEP joint program. We thank Noam Zion of BIU for XPS and Gennady Shter of Technion for TGA\DTA.

Funders
Ministry of Energy and Water
Technion‐Israel Institute of Technology
UConn-GTEP
Nancy and Stephen Grand Technion Energy Program
Technion-Israel Institute of Technology
Israel National Research Center for Electrochemical Propulsion

Keywords

density functional calculations
electrocatalysis
hydroxides
porous materials
relaxation processes

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10.1002/cssc.202002946

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title = "Optimization of Ni−Co−Fe-Based Catalysts for Oxygen Evolution Reaction by Surface and Relaxation Phenomena Analysis",

abstract = "Trimetallic double hydroxide NiFeCo−OH is prepared by coprecipitation, from which three different catalysts are fabricated by different heat treatments, all at 350 °C maximum temperature. Among the prepared catalysts, the one prepared at a heating and cooling rate of 2 °C min−1 in N2 atmosphere (designated NiFeCo−N2-2 °C) displays the best catalytic properties after stability testing, exhibiting a high current density (9.06 mA cm−2 at 320 mV), low Tafel slope (72.9 mV dec−1), good stability (over 20 h), high turnover frequency (0.304 s−1), and high mass activity (46.52 A g−1 at 320 mV). Stability tests reveal that the hydroxide phase is less suitable for long-term use than catalysts with an oxide phase. Two causes are identified for the loss of stability in the hydroxide phase: a) Modeling of the distribution function of relaxation times (DFRT) reveals the increase in resistance contributed by various relaxation processes; b) density functional theory (DFT) surface energy calculations reveal that the higher surface energy of the hydroxide-phase catalyst impairs the stability. These findings represent a new strategy to optimize catalysts for water splitting.",

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AU - Attias, Rinat

AU - Vijaya Sankar, Kalimuthu

AU - Dhaka, Kapil

AU - Moschkowitsch, Wenjamin

AU - Elbaz, Lior

AU - Caspary Toroker, Maytal

AU - Tsur, Yoed

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AB - Trimetallic double hydroxide NiFeCo−OH is prepared by coprecipitation, from which three different catalysts are fabricated by different heat treatments, all at 350 °C maximum temperature. Among the prepared catalysts, the one prepared at a heating and cooling rate of 2 °C min−1 in N2 atmosphere (designated NiFeCo−N2-2 °C) displays the best catalytic properties after stability testing, exhibiting a high current density (9.06 mA cm−2 at 320 mV), low Tafel slope (72.9 mV dec−1), good stability (over 20 h), high turnover frequency (0.304 s−1), and high mass activity (46.52 A g−1 at 320 mV). Stability tests reveal that the hydroxide phase is less suitable for long-term use than catalysts with an oxide phase. Two causes are identified for the loss of stability in the hydroxide phase: a) Modeling of the distribution function of relaxation times (DFRT) reveals the increase in resistance contributed by various relaxation processes; b) density functional theory (DFT) surface energy calculations reveal that the higher surface energy of the hydroxide-phase catalyst impairs the stability. These findings represent a new strategy to optimize catalysts for water splitting.

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Optimization of Ni−Co−Fe-Based Catalysts for Oxygen Evolution Reaction by Surface and Relaxation Phenomena Analysis

Abstract

Bibliographical note

Funding

Keywords

UN SDGs

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