Chemical transformation of iron alkoxide nanosheets to FeOOH nanoparticles for highly active and stable oxygen evolution electrocatalysts

Lee, Jooyoung; Lee, Hoyoung; Lim, Byungkwon

doi:10.1016/j.jiec.2017.09.013

Cited by 45 publications

(18 citation statements)

References 30 publications

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“…Therefore, many AWE cells currently use steel or nickel alloy plated steel. Despite the recent results of many OER catalyst studies, there are not many reported studies on OER evaluation and stable OER catalysts above 20 wt.% KOH other than a few papers [ 27 , 28 , 29 ]. Therefore, development of stable electrodes even above 20 wt.% KOH is strongly needed.…”

Section: Introductionmentioning

confidence: 99%

Effects of Annealing Temperature on the Oxygen Evolution Reaction Activity of Copper–Cobalt Oxide Nanosheets

et al. 2021

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Developing high performance, highly stable, and low-cost electrodes for the oxygen evolution reaction (OER) is challenging in water electrolysis technology. However, Ir- and Ru-based OER catalysts with high OER efficiency are difficult to commercialize as precious metal-based catalysts. Therefore, the study of OER catalysts, which are replaced by non-precious metals and have high activity and stability, are necessary. In this study, a copper–cobalt oxide nanosheet (CCO) electrode was synthesized by the electrodeposition of copper–cobalt hydroxide (CCOH) on Ni foam followed by annealing. The CCOH was annealed at various temperatures, and the structure changed to that of CCO at temperatures above 250 °C. In addition, it was observed that the nanosheets agglomerated when annealed at 300 °C. The CCO electrode annealed at 250 °C had a high surface area and efficient electron conduction pathways as a result of the direct growth on the Ni foam. Thus, the prepared CCO electrode exhibited enhanced OER activity (1.6 V at 261 mA/cm2) compared to those of CCOH (1.6 V at 144 mA/cm2), Co3O4 (1.6 V at 39 mA/cm2), and commercial IrO2 (1.6 V at 14 mA/cm2) electrodes. The optimized catalyst also showed high activity and stability under high pH conditions, demonstrating its potential as a low cost, highly efficient OER electrode material.

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Section: Introductionmentioning

confidence: 99%

Effects of Annealing Temperature on the Oxygen Evolution Reaction Activity of Copper–Cobalt Oxide Nanosheets

et al. 2021

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“…Its activity, however, is highly dependent on catalyst electrical conductivity, electrode substrate, and the details of the catalyst structure. [6][7][8][9][10][11][12] When Fe is combined with NiO x H y or CoO x H y , the OER activity is further increased. [7,13,14] These effects are incompletely understood and a better understanding might facilitate the design of OER electrocatalysts with higher intrinsic activities.…”

Section: Introductionmentioning

confidence: 99%

Effects of Metal Electrode Support on the Catalytic Activity of Fe(oxy)hydroxide for the Oxygen Evolution Reaction in Alkaline Media

et al. 2019

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FeOxHy and Fe‐containing Ni/Co oxyhydroxides are the most‐active catalysts for the oxygen evolution reaction (OER) in alkaline media. However, the activity of Fe sites appears strongly dependent on the electrode‐substrate material and/or the elemental composition of the matrix in which it is embedded. A fundamental understanding of these interactions that modulate the OER activity of FeOxHy is lacking. We report the use of cyclic voltammetry and chronopotentiometry to assess the substrate‐dependent activity of FeOxHy on a number of commonly used electrode substrates, including Au, Pt, Pd, Cu, and C. We also evaluate the OER activity and Tafel behavior of these metallic substrates in 1 M KOH aqueous solution with Fe3+ and other electrolyte impurities. We find that the OER activity of FeOxHy varies by substrate in the order Au>Pd≈Pt≈Cu>C. The trend may be caused by differences in the adsorption strength of the Fe oxo ion on the substrate, where a stronger adhesion results in more adsorbed Fe at the interface during steady‐state OER and possibly a decreased charge‐transfer resistance at the FeOxHy‐substrate interface. These results suggest that the local atomic and electronic structure of [FeO6] units play an important role in catalysis of the OER as the activity can be tuned substantially by substrate interactions.

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“…Moreover, the FT-IR spectrum of Co 0.5 Fe 0.5 OOH-NSUPs in Figure S4 demonstrates that the bands associated with organic molecules are absent, and the new appeared peaks at ∼560 cm −1 could be assigned to the characteristic peak of metal oxyhydroxide. 42,43 No signals associated with other functional groups are detected, indicating the formation of pure CoFe oxyhydroxide.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical Synthesis of Cation Vacancy-Enriched Ultrathin Bimetallic Oxyhydroxide Nanoplatelets for Enhanced Water Oxidation

Wang

Shi

et al. 2019

ACS Appl. Mater. Interfaces

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Metal cation vacancies, a kind of structural defect, are viewed as a promising strategy for regulating the electronic properties to enhance the catalytic activity. However, the effective introduction of cation vacancies into electrocatalysts still remains a challenge. Herein, we present and elucidate a facile “fast reduction and in situ phase transformation” strategy at room temperature to simultaneously introduce abundant metal cation vacancies (cobalt vacancies and iron vacancies) into Co0.5Fe0.5OOH electrocatalysts. The incorporation of the Fe element could tailor the micrometer-sized ultrathin CoOOH platelets into nanometer-sized ultrathin Co0.5Fe0.5OOH platelets, and the tailoring process is accompanied with the generation of numerous cation vacancies. The defect degree of CoOOH could be effectively tuned by the incorporation of Fe, resulting in more active sites and lower energy barrier, and thereby the intrinsic catalytic activity of electrocatalysts was further enhanced. Compared to CoOOH, the optimized nanometer-sized ultrathin Co0.5Fe0.5OOH platelets (Co0.5Fe0.5OOH-NSUPs) require a smaller overpotential of 220 mV at a current density of 20 mA cm–2, lower Tafel slope of 38.2 mV dec–1, and better long-term durability without obvious decay for more than 200 h at a high current density of 40 mA cm–2. The electrochemical performances are equal to or better than that of the reported first-class electrocatalysts. More importantly, this work provides new perspective for designing and fabricating efficient multimetal electrocatalysts in large scale.

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Chemical transformation of iron alkoxide nanosheets to FeOOH nanoparticles for highly active and stable oxygen evolution electrocatalysts

Cited by 45 publications

References 30 publications

Effects of Annealing Temperature on the Oxygen Evolution Reaction Activity of Copper–Cobalt Oxide Nanosheets

Effects of Annealing Temperature on the Oxygen Evolution Reaction Activity of Copper–Cobalt Oxide Nanosheets

Effects of Metal Electrode Support on the Catalytic Activity of Fe(oxy)hydroxide for the Oxygen Evolution Reaction in Alkaline Media

Electrochemical Synthesis of Cation Vacancy-Enriched Ultrathin Bimetallic Oxyhydroxide Nanoplatelets for Enhanced Water Oxidation

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