The importance of the iron valence state in NiCoFe nanosheet array catalysts for the oxygen evolution reaction

Hu, Hua‐Shuai; Li, Yang; Deng, Gao; Shao, Yaru; Li, Kexin; Wang, Chong‐Bin; Feng, Yuanyuan

doi:10.1039/d0qi01179g

Cited by 14 publications

(9 citation statements)

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“…Hu et al prepared a nickel foam (NF) supported low-crystalline ternary NiCoFe nanosheet electrocatalyst by the cation exchange method. 124 The introduction of Fe atoms reduces the crystallinity of NiCoFe samples and produces a large number of surface defects, thereby accelerating the charge-transfer process of OER and improving OER activity. Bates et al prepared a catalyst composed of a ternary mixed metal oxide film of Ni−Fe−Co oxide supported on Raney Ni.…”

Section: Nico-based Oer Electrocatalystsmentioning

confidence: 99%

“…Fe dopant can effectively improve the OER activity of NiCo-based catalysts. Hu et al prepared a nickel foam (NF) supported low-crystalline ternary NiCoFe nanosheet electrocatalyst by the cation exchange method . The introduction of Fe atoms reduces the crystallinity of NiCoFe samples and produces a large number of surface defects, thereby accelerating the charge-transfer process of OER and improving OER activity.…”

Section: Nico-based Oer Electrocatalystsmentioning

confidence: 99%

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NiCo-Based Electrocatalysts for the Alkaline Oxygen Evolution Reaction: A Review

et al. 2021

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Electrocatalytic water splitting is a sustainable way to produce hydrogen energy, but the oxygen evolution reaction (OER) at the anode has sluggish kinetics and low energy conversion efficiency, which is the major bottleneck for large-scale hydrogen production. The design and synthesis of robust and low-cost OER catalysts are crucial for the OER. NiCo-based electrocatalysts have suitable atomic and electronic structures, and show high activity and stability during the OER process. Recently, significant progress has been made in regulating the structure and composition of NiCo-based catalysts and understanding the nature of catalysis, especially the OER mechanism, catalytic active sites, and structure–activity relationship. In this work, we summarized and discussed the latest development of NiCo-based electrocatalysts in the OER, with particular emphasis on catalyst design and synthesis, strategies for boosting OER performance, and understanding the nature of catalysis from experimental and theoretical perspectives. The OER mechanism, some activity descriptors, and atomic and electronic structure–activity relationships based on NiCo-based electrocatalysts are unveiled. Finally, some challenges and futuristic outlooks for improving the performance of NiCo-based electrocatalysts are proposed, and we hope this review can provide guidance for the design of more efficient NiCo-based electrocatalysts.

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Section: Nico-based Oer Electrocatalystsmentioning

confidence: 99%

Section: Nico-based Oer Electrocatalystsmentioning

confidence: 99%

NiCo-Based Electrocatalysts for the Alkaline Oxygen Evolution Reaction: A Review

et al. 2021

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“… 25 In addition, the peaks at 712.6 and 726.8 eV correspond to Fe 3+ 2p 3/2 and Fe 3+ 2p 1/2 states, respectively. 25 − 27 In Figure 4 e,f, the peaks at 780.1 and 795.2 eV are attributed to Co 2+ 2p 3/2 and Co 2+ 2p 1/2 . 27 In the case of Fe–Ni–Co(co), the Co 3+ 2p 3/2 and Co 3+ 2p 1/2 peaks appeared at 782.5 and 797.1 eV; however, in Fe–Ni–Co(cv), they were slightly shifted owing to surface oxidation, and peaks appeared at 785.1 and 800.5 eV.…”

Section: Resultsmentioning

confidence: 96%

“… 25 − 27 In Figure 4 e,f, the peaks at 780.1 and 795.2 eV are attributed to Co 2+ 2p 3/2 and Co 2+ 2p 1/2 . 27 In the case of Fe–Ni–Co(co), the Co 3+ 2p 3/2 and Co 3+ 2p 1/2 peaks appeared at 782.5 and 797.1 eV; however, in Fe–Ni–Co(cv), they were slightly shifted owing to surface oxidation, and peaks appeared at 785.1 and 800.5 eV. 27 The peaks at 854.4 and 872.5 eV in the Ni 2p spectrum are attributed to Ni 2+ 2p 3/2 and Ni 2+ 2p 1/2 .…”

Section: Resultsmentioning

confidence: 96%

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Fabrication of Trimetallic Fe–Co–Ni Electrocatalysts for Highly Efficient Oxygen Evolution Reaction

Jung

Park

et al. 2022

ACS Omega

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The development of inexpensive and well-activated water-splitting catalysts is required to reduce the use of conventional fossil fuels. In this study, a trimetallic Fe−Co−Ni catalyst was fabricated using a simple ion electrodeposition method. The metal deposition was performed using cyclic voltammetry, which was more efficient than constant-voltage deposition and significantly increased the stability of the catalyst. The synthesized material presented the morphology of a nanoflower in which the nanosheets were agglomerated. The Fe−Co−Ni catalyst exhibited excellent oxygen evolution reaction (OER) properties because the charge-transfer rate was improved owing to the synergistic effect of the metals. The OER was performed in a 1 M KOH solution using a three-electrode system, and the overpotential was 302 mV at 100 mA/cm 2 . In addition, the Fe−Co−Ni catalyst exhibited excellent stability in alkaline solution for more than 48 h at 200 mA/cm 2 . The results show that the method for preparing Fe−Co−Ni significantly improves its catalytic activity, and the resulting material could be used as an economical and efficient catalyst in future.

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Enriched Fe Doped on Amorphous Shell Enable Crystalline@Amorphous Core–Shell Nanorod Highly Efficient Electrochemical Water Oxidation

Sheng

Zeng

et al. 2023

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The rational design of efficient and cost‐effective electrocatalysts for oxygen evolution reaction (OER) with sluggish kinetics, is imperative to diverse clean energy technologies. The performance of electrocatalyst is usually governed by the number of active sites on the surface. Crystalline/amorphous heterostructure has exhibited unique properties and opens new paradigms toward designing electrocatalysts with abundant active sites for improved performance. Hence, Fe doped Ni–Co phosphite (Fe‐NiCoHPi) electrocatalyst with cauliflower‐like structure, comprising crystalline@amorphous core–shell nanorod, is reported. The experiments uncover that Fe is enriched in the amorphous shell due to the flexibility of the amorphous component. Further density functional theory calculations indicate that the strong electronic interaction between the enriched Fe in the amorphous shell and crystalline core host at the core–shell interface, leads to balanced binding energies of OER intermediates, which is the origin of the catalyst‐activity. Eventually, the Fe‐NiCoHPi exhibits remarkable activity, with low overpotentials of only 206 and 257 mV at current density of 15 and 100 mA cm−2. Unceasing durability over 90 h is achieved, which is superior to the effective phosphate electrocatalysts. Although the applications at high current remain challenges , this work provides an approach for designing advanced OER electrocatalysts for sustainable energy devices.

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The importance of the iron valence state in NiCoFe nanosheet array catalysts for the oxygen evolution reaction

Abstract: The development of low-cost, highly active and stable electrocatalysts for oxygen evolution reaction (OER) is desirable and challenging. In this work, we report nickel foam (NF) supported low-crystalline NiCoFe nanosheet...

Cited by 14 publications

References 64 publications

NiCo-Based Electrocatalysts for the Alkaline Oxygen Evolution Reaction: A Review

NiCo-Based Electrocatalysts for the Alkaline Oxygen Evolution Reaction: A Review

Fabrication of Trimetallic Fe–Co–Ni Electrocatalysts for Highly Efficient Oxygen Evolution Reaction

Enriched Fe Doped on Amorphous Shell Enable Crystalline@Amorphous Core–Shell Nanorod Highly Efficient Electrochemical Water Oxidation

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