A transparent iron-incorporated nickel hydroxide electrocatalyst for efficient water oxidation

Ahmed, Amira Y.; Dhawale, Dattatray S.; Kandiel, Tarek A.

doi:10.1039/d3se00527e

Cited by 6 publications

(4 citation statements)

References 52 publications

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“…The calculated values for Tafel slopes (Figure b) were 48 mV·dec –1 (NiFe 2 O 4 ), 62 mV·dec –1 (Zn 0.2 Ni 0.8 Fe 2 O 4 ), 58 mV·dec –1 (Zn 0 .3 Ni 0.7 Fe 2 O 4 ), 50 mV·dec –1 (Zn 0.4 Ni 0.6 Fe 2 O 4 ), and 46 mV·dec –1 (Zn 0.5 Ni 0.5 Fe 2 O 4 ). These values are closely related to 60 mV·dec –1 , suggesting chemical transformation followed by fast e – transfer in OER …”

Section: Resultsmentioning

confidence: 67%

“…For a given metal, an adsorbed OH – layer is spontaneously formed on the surface when exposed to alkaline conditions. The widely accepted water oxidation mechanism on transition metal oxides was proposed by Otagawa and Bockris . According to them, a hydroxide layer is formed in the initial step under oxidizing conditions by the adsorption of OH – which subsequently reacts with OH – to form the oxide layer and release e – and H 2 O.…”

Section: Resultsmentioning

confidence: 99%

“…The widely accepted water oxidation mechanism on transition metal oxides was proposed by Otagawa and Bockris. 65 According to them, a hydroxide layer is formed in the initial step under oxidizing conditions by the adsorption of OH − which subsequently reacts with OH − to form the oxide layer and release e − and H 2 O. This is followed by the hydroxylation reaction of OH Many researchers have suggested eq 8 as the rate-limiting step during OER by transition metal oxides.…”

Section: Electrochemical Measurementmentioning

confidence: 99%

“…These values are closely related to 60 mV•dec −1 , suggesting chemical transformation followed by fast e − transfer in OER. 65 The microkinetic analysis model predicts that the Tafel slope will decrease if predominant surface-adsorbed intermediates are present in early OER stages. 68 The incorporation of Zn resulted in a decrease in Tafel slopes to 46 mV•dec −1 for Zn 0.5 Ni 0.5 Fe 2 O 4 , consistent with lower OER overpotentials.…”

Section: Electrochemical Measurementmentioning

confidence: 99%

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Unraveling the Electrocatalytic Response of Zn-Substituted Nickel Ferrite for Overall Water Splitting

Khan,

Rahman,

Chae

et al. 2024

ACS Appl. Energy Mater.

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Nickel ferrites (NiFe 2 O 4 ) having rich redox chemistry are regarded as proficient electrocatalysts for sustainable and renewable energy applications. However, its entire potential as an electrode material is limited by its weak structural characteristics and inadequate charge transport qualities. This work reports a series of zinc-substituted inverse spinel ferrites (Zn x Ni 1−x Fe 2 O 4 ) synthesized by a simple and environmentally benign hydrothermal method as electrocatalysts for overall water splitting. The surface morphology, structural elements, and electronic properties of resultant materials are significantly changed by Zn inclusion. Among different compositions, the ferrite sample Zn 0.5 Ni 0.5 Fe 2 O 4 showed outstanding water splitting performances, with a current density of 100 mA•cm −2 for OER and HER at the cost of 290 mV and 311 mV overpotentials, respectively. The electrode demonstrated lower Tafel slopes of 56 and 46 mV•dec −1 for HER and OER with a high turnover frequency (TOF) and exchange current density (j 0 ). Significantly, this electrode demanded a cell voltage of 1.48 V in a two-electrode electrolyzer to deliver 10 mA•cm −2 and showed good stability for 24 h. This is attributed to the efficient charge transport properties of the Zn-incorporated NiFe 2 O 4 with high electrical conductivity and charge transfer characteristics. Overall, the findings highlighted the potential of Zn-incorporated NiFe 2 O 4 as a promising electrocatalyst for renewable hydrogen production.

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Section: Resultsmentioning

confidence: 67%

Section: Resultsmentioning

confidence: 99%

Section: Electrochemical Measurementmentioning

confidence: 99%

Section: Electrochemical Measurementmentioning

confidence: 99%

See 2 more Smart Citations

Unraveling the Electrocatalytic Response of Zn-Substituted Nickel Ferrite for Overall Water Splitting

Khan,

Rahman,

Chae

et al. 2024

ACS Appl. Energy Mater.

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Advances in Spin‐Modulated Electrocatalysis of Oxygen Evolution Reaction

Taspya,

Snigdha,

Islam

2024

ChemistrySelect

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Electrochemical splitting of water for hydrogen generation has emerged as a potential strategy for transitioning towards renewable energy sources and mitigating the environmental impact of fossil fuel dependence. However, the efficiency of water splitting is mainly hindered by oxygen evolution reaction (OER) at the anode side, which involves kinetically sluggish four proton‐coupled electron‐transfer steps. Recent studies on OER demonstrate that a spin‐dependent mechanism governs the reaction kinetics, wherein the electronic exchange interactions in the catalytic activity of transition metals can provide a spin‐selective channel to filter out electron spins with the right orientation during the formation of O2. Maximizing efficiency and stability of such catalysts require optimization the geometric and electrical structures of transition metal systems. In addition, it is vital to understand the OER mechanism with spin considerations to be familiar with the connection between spin, charge, orbital, and lattice characteristics. This review focuses on current developments in understanding and the use of the spin‐related effect in the OER mechanism.

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Binder-free synthesis of nickel-iron-cobalt-oxide electrode for large-scale and durable oxygen evolution reaction

Bhoj,

Chavan,

Mane

et al. 2024

International Journal of Hydrogen Energy

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A transparent iron-incorporated nickel hydroxide electrocatalyst for efficient water oxidation

Abstract: Developing transparent electrocatalyst electrodes for oxygen evolution reaction (OER) is indispensable for fabricating a tandem photoelectrochemical device for solar hydrogen production. Herein, we developed a facile solution-based method for depositing...

Cited by 6 publications

References 52 publications

Unraveling the Electrocatalytic Response of Zn-Substituted Nickel Ferrite for Overall Water Splitting

Unraveling the Electrocatalytic Response of Zn-Substituted Nickel Ferrite for Overall Water Splitting

Advances in Spin‐Modulated Electrocatalysis of Oxygen Evolution Reaction

Binder-free synthesis of nickel-iron-cobalt-oxide electrode for large-scale and durable oxygen evolution reaction

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