Ultrafine cobalt oxide nanosheets for enhanced high activity towards oxygen evolution reaction

Song, Cuimeng; Luo, Hubin; Duan, Xuliang; Li, Yun; Li, Yujin; Yang, Yinhang; Wu, Jian; Wang, Fang; Meng, Fanman; Zhang, Jian

doi:10.1016/j.catcom.2022.106520

“…The thickness of the Co–C nanosheets prepared in this work is smaller than their diameter, and the surface roughness is very small, the surface roughness of Fe 1 Co 1.1 Ni 1.4 -C films is greater than that of the Co–C nanosheets. The different roughnesses of the Fe 1 Co 1.1 Ni 1.4 -C films and the Co–C nanosheets lead to different optimum covering thicknesses of amorphous carbon.…”

Section: Resultsmentioning

confidence: 78%

“…To assess the OER performance of Fe 1 Co 1.1 Ni 1.4 -C films and Co–C nanosheets, a series of electrocatalytic experiments were carried out using standard Ag/AgCl electrodes and Pt wires as reference and counter electrodes, respectively, and carbon cloth-supported Fe 1 Co 1.1 Ni 1.4 -C films (0.36 cm –2 , 2.58 × 10 –6 g) or Co–C nanosheets (0.056 cm –2 , 1.37 × 10 –7 g, detailed calculation methods for the area and mass of Co–C nanosheets deposited on carbon cloth substrates were given in our previous work) as working electrodes in 1.0 M KOH . RuO 2 film and commercial RuO 2 loaded on carbon cloth were used as benchmark catalysts for comparison.…”

Section: Resultsmentioning

confidence: 99%

“…To assess the OER performance of Fe 1 Co 1.1 Ni 1.4 -C films and Co−C nanosheets, a series of electrocatalytic experiments were carried out using standard Ag/AgCl electrodes and Pt wires as reference and counter electrodes, respectively, and carbon cloth-supported Fe 1 Co 1.1 Ni 1.4 -C films (0.36 cm −2 , 2.58 × 10 −6 g) or Co−C nanosheets (0.056 cm −2 , 1.37 × 10 −7 g, detailed calculation methods for the area and mass of Co−C nanosheets deposited on carbon cloth substrates were given in our previous work) as working electrodes in 1.0 M KOH. 37 RuO 2 film and commercial RuO 2 loaded on carbon cloth were used as benchmark catalysts for comparison. The OER activity of the Fe 1 Co 1.1 Ni 1.4 -C films, RuO 2 film, and commercial RuO 2 can be estimated from the LSV curves, as shown in Figures 5a and S7, and the overpotential trends at the current density of 100 mA cm −2 and the mass activity at 1.60 V vs RHE are shown in Figures 5c and S8b, respectively.…”

Section: Xrd Analysis Wasmentioning

confidence: 99%

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Controllable Thickness of Amorphous Carbon Coverage to Enhance the Activity and Stability of Transition Metals in Oxygen Evolution Reaction

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et al. 2024

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Encapsulating 3d transition metals (3d TMs) in crystalline carbon is a crucial strategy for improving the activity and durability. However, it is unclear whether covering amorphous carbon can enhance catalytic activity and what the optimal thickness is. Herein, we precisely control the amorphous carbon thickness on 3d TMs. As the thickness of amorphous carbon increases, the catalytic activity of 3d TMs exhibits a volcano-type trend. Covering amorphous carbon with a thickness of ≤4−8 Å can simultaneously improve the catalytic activity and durability of 3d TM catalysts. The catalytic activity of 3d TM catalysts covered with amorphous carbon surpasses that of RuO 2 film and commercial RuO 2 by a significant margin. Density functional theory calculations demonstrated that covering amorphous carbon increases the density of states of the Fermi level and reduces the Gibbs free energy of intermediate adsorption, which promotes electron transfer and intermediate adsorption in the catalytic process. Our work manifests a universal strategy for improving the activity and durability of 3d TM electrocatalysts.

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Unlocking Catalytic Potential: Exploring the Impact of Thermal Treatment on Enhanced Electrocatalysis of Nanomaterials

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Lee,

Sriram

et al. 2023

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In the evolving field of electrocatalysis, thermal treatment of nano‐electrocatalysts has become an essential strategy for performance enhancement. This review systematically investigates the impact of various thermal treatments on the catalytic potential of nano‐electrocatalysts. The focus encompasses an in‐depth analysis of the changes induced in structural, morphological, and compositional properties, as well as alterations in electro‐active surface area, surface chemistry, and crystal defects. By providing a comprehensive comparison of commonly used thermal techniques, such as annealing, calcination, sintering, pyrolysis, hydrothermal, and solvothermal methods, this review serves as a scientific guide for selecting the right thermal technique and favorable temperature to tailor the nano‐electrocatalysts for optimal electrocatalysis. The resultant modifications in catalytic activity are explored across key electrochemical reactions such as electrochemical (bio)sensing, catalytic degradation, oxygen reduction reaction, hydrogen evolution reaction, overall water splitting, fuel cells, and carbon dioxide reduction reaction. Through a detailed examination of the underlying mechanisms and synergistic effects, this review contributes to a fundamental understanding of the role of thermal treatments in enhancing electrocatalytic properties. The insights provided offer a roadmap for future research aimed at optimizing the electrocatalytic performance of nanomaterials, fostering the development of next‐generation sensors and energy conversion technologies.

show abstract

Unlocking Catalytic Potential: Exploring the Impact of Thermal Treatment on Enhanced Electrocatalysis of Nanomaterials

Kogularasu,

Lee,

Sriram

et al. 2023

View full text Add to dashboard Cite

In the evolving field of electrocatalysis, thermal treatment of nano‐electrocatalysts has become an essential strategy for performance enhancement. This review systematically investigates the impact of various thermal treatments on the catalytic potential of nano‐electrocatalysts. The focus encompasses an in‐depth analysis of the changes induced in structural, morphological, and compositional properties, as well as alterations in electro‐active surface area, surface chemistry, and crystal defects. By providing a comprehensive comparison of commonly used thermal techniques, such as annealing, calcination, sintering, pyrolysis, hydrothermal, and solvothermal methods, this review serves as a scientific guide for selecting the right thermal technique and favorable temperature to tailor the nano‐electrocatalysts for optimal electrocatalysis. The resultant modifications in catalytic activity are explored across key electrochemical reactions such as electrochemical (bio)sensing, catalytic degradation, oxygen reduction reaction, hydrogen evolution reaction, overall water splitting, fuel cells, and carbon dioxide reduction reaction. Through a detailed examination of the underlying mechanisms and synergistic effects, this review contributes to a fundamental understanding of the role of thermal treatments in enhancing electrocatalytic properties. The insights provided offer a roadmap for future research aimed at optimizing the electrocatalytic performance of nanomaterials, fostering the development of next‐generation sensors and energy conversion technologies.

show abstract

Ultrafine cobalt oxide nanosheets for enhanced high activity towards oxygen evolution reaction

Cited by 5 publications

References 39 publications

Controllable Thickness of Amorphous Carbon Coverage to Enhance the Activity and Stability of Transition Metals in Oxygen Evolution Reaction

Controllable Thickness of Amorphous Carbon Coverage to Enhance the Activity and Stability of Transition Metals in Oxygen Evolution Reaction

Unlocking Catalytic Potential: Exploring the Impact of Thermal Treatment on Enhanced Electrocatalysis of Nanomaterials

Unlocking Catalytic Potential: Exploring the Impact of Thermal Treatment on Enhanced Electrocatalysis of Nanomaterials

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