2D Nanostructures of CoFe2O4 and NiFe2O4: Efficient Oxygen Evolution Catalyst

Mahala, Chavi; Sharma, Mamta; Basu, Mrinmoyee

doi:10.1016/j.electacta.2018.04.079

Cited by 138 publications

(48 citation statements)

References 50 publications

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“…Fig. 1b 36,37 The peaks originated at 709.7, 711.8, 722.9 and 724.9 eV are attributed to Fe 2+ 2p 3/2 , Fe 3+ 2p 3/2 , Fe 2+ 2p 1/2 and Fe 3+ 2p 1/2 states, respectively (Fig. 1c).…”

Section: Resultsmentioning

confidence: 97%

Spinel oxide CoFe₂O₄ grown on Ni foam as an efficient electrocatalyst for oxygen evolution reaction

et al. 2019

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“…Fig. 1b 36,37 The peaks originated at 709.7, 711.8, 722.9 and 724.9 eV are attributed to Fe 2+ 2p 3/2 , Fe 3+ 2p 3/2 , Fe 2+ 2p 1/2 and Fe 3+ 2p 1/2 states, respectively (Fig. 1c).…”

Section: Resultsmentioning

confidence: 97%

Spinel oxide CoFe₂O₄ grown on Ni foam as an efficient electrocatalyst for oxygen evolution reaction

et al. 2019

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“…To understand the enhancement in electrocatalytic activity of Ni(OH) 2 /NiOOH after Fe doping, there are few other parameters like mass activity, electrochemically active surface area (ECSA) are determined . Here mass activity for all the developed catalysts are calculated at a fixed potential of 1.65 V vs. RHE and the observed data are presented in Table .…”

Section: Resultsmentioning

confidence: 99%

“…Results show that both the catalysts are stable with very slight variation in OER current density after 1000 runs (Figure 5a To understand the enhancement in electrocatalytic activity of Ni(OH) 2 /NiOOH after Fe doping, there are few other parameters like mass activity, electrochemically active surface area (ECSA) are determined. [48][49][50] Here mass activity for all the developed catalysts are calculated at a fixed potential of 1.65 V vs. RHE and the observed data are presented in Table 1. The Mass activity of Ni(OH) 2 for Ni(OH) 2 /NiOOH and Fe 0.06 Ni 0.94 (OH) 2 /NiOOH, respectively.…”

Section: Evaluation Of the Electrocatalytic Activity Towards The Oermentioning

confidence: 99%

Fe‐Doped Nickel Hydroxide/Nickel Oxyhydroxide Function as an Efficient Catalyst for the Oxygen Evolution Reaction

2019

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Designing metal hydroxide electrocatalysts with high efficiency to overcome the slow reaction kinetics of the oxygen evolution reaction (OER) is considered as a significant approach for renewable energy resources. We report here a simple methodology to synthesize 2D thin nickel hydroxide/nickel oxyhydroxide sheets that show efficient activity towards OER. Further, by doping with a heteroatom, Fe, thinner sheets of nickel hydroxide/nickel oxyhydroxide are developed, which exhibit enhanced electrocatalytic activity towards OER with high durability. Fe‐doped Ni(OH)2/NiOOH requires only 200 mV overpotential to produce 10 mA/cm2, whereas bare Ni(OH)2/NiOOH needs 290 mV overpotential. Moreover, Fe‐doped nickel hydroxide/nickel oxyhydroxide shows a minimal Tafel value of 48 mV/decade, which is even lower than RuO2/CC (82 mV/decade). X‐ray photoelectron spectroscopy indicates that in the case of Fe‐doped Ni(OH)2/NiOOH, the Ni3+ signal enhances, which indicates the favourable stabilization of Ni3+ in the presence of Fe3+ dopant. Under electrochemical OER conditions, in Fe‐doped Ni(OH)2/NiOOH, Fe3+ species help to generate more Ni3+, which function as the active species. Fe0.06Ni0.94(OH)2/NiOOH shows long‐term stability for at least 24 hours in alkaline medium. This work unveils a green strategy for Fe‐doping in 2D thin sheets of Ni(OH)2/NiOOH, which show improved electrocatalytic activity compared to bare Ni(OH)2/NiOOH. The mechanism of OER activity enhancement after Fe‐doping is proposed here.

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“…However, there are only a few existing studies on the electrocatalytic performance of NiFe 2 O 4 for the OER. Mahala et al . reported that 2D nanostructures of NiFe 2 O 4 require 460 mV overpotential to produce a current density of 10 mA cm −2 in 1 M NaOH.…”

Section: Introductionmentioning

confidence: 99%

“…[22][23][24] However, there are only a few existing studies on the electrocatalytic performance of NiFe 2 O 4 for the OER. Mahala et al [25] reported that 2D nanostructures of NiFe 2 O 4 require 460 mV overpotential to produce a current density of 10 mA cm À 2 in 1 M NaOH. Liu and coworkers [26] successfully prepared sulfur-incorporated NiFe 2 O 4 nanosheets on nickel foam that improved the OER performance of NiFe 2 O 4 .…”

Section: Introductionmentioning

confidence: 99%

Oxygen‐Deficient NiFe₂O₄ Spinel Nanoparticles as an Enhanced Electrocatalyst for the Oxygen Evolution Reaction

et al. 2019

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Herein, mesoporous NiFe2O4 spinel nanoparticles with abundant oxygen vacancies are successfully prepared by a simple hydrothermal method followed by mild H2 reduction and used as catalysts for the oxygen evolution reaction. Compared with the pristine and air‐treated NiFe2O4, the H2‐treated NiFe2O4 shows a much lower overpotential of 389 mV at a current density of 10 mA cm−2. The H2‐treated NiFe2O4 also indicates substantial long‐term stability even after 1000 cyclic tests. This outstanding electrochemical activity and stability can be attributed to the improved physicochemical properties by H2 treatment: small nanoparticles with well‐developed mesoporous structures, a high ratio of Ni2+/Ni3+ cations, and abundant oxygen vacancies. These properties can significantly improve charge transfer kinetics and increase the number of active sites on the catalyst. The results demonstrate that this facile fabrication method is a promising route for developing cost‐effective and high‐performance catalysts to be used in electrochemical applications.

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2D Nanostructures of CoFe2O4 and NiFe2O4: Efficient Oxygen Evolution Catalyst

Cited by 138 publications

References 50 publications

Spinel oxide CoFe₂O₄ grown on Ni foam as an efficient electrocatalyst for oxygen evolution reaction

Spinel oxide CoFe₂O₄ grown on Ni foam as an efficient electrocatalyst for oxygen evolution reaction

Fe‐Doped Nickel Hydroxide/Nickel Oxyhydroxide Function as an Efficient Catalyst for the Oxygen Evolution Reaction

Oxygen‐Deficient NiFe₂O₄ Spinel Nanoparticles as an Enhanced Electrocatalyst for the Oxygen Evolution Reaction

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2D Nanostructures of CoFe2O4 and NiFe2O4: Efficient Oxygen Evolution Catalyst

Cited by 138 publications

References 50 publications

Spinel oxide CoFe2O4 grown on Ni foam as an efficient electrocatalyst for oxygen evolution reaction

Spinel oxide CoFe2O4 grown on Ni foam as an efficient electrocatalyst for oxygen evolution reaction

Fe‐Doped Nickel Hydroxide/Nickel Oxyhydroxide Function as an Efficient Catalyst for the Oxygen Evolution Reaction

Oxygen‐Deficient NiFe2O4 Spinel Nanoparticles as an Enhanced Electrocatalyst for the Oxygen Evolution Reaction

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Spinel oxide CoFe₂O₄ grown on Ni foam as an efficient electrocatalyst for oxygen evolution reaction

Spinel oxide CoFe₂O₄ grown on Ni foam as an efficient electrocatalyst for oxygen evolution reaction

Oxygen‐Deficient NiFe₂O₄ Spinel Nanoparticles as an Enhanced Electrocatalyst for the Oxygen Evolution Reaction