Composition controllable fabrication of ultrathin 2D CoMn layered double hydroxides for highly efficient electrocatalytic oxygen evolution

Pan, Shangke; Li, Bing; Yu, Jianguo; Zhao, Lulu; Zhang, Yongxing

doi:10.1016/j.apsusc.2020.148305

Cited by 21 publications

(6 citation statements)

References 55 publications

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“…16,31 and Tafel slope of the present HELDH-MC/NF sample conrm its superior activity to most of the currently available binary or ternary LDH electrocatalysts for the OER (see Fig. 3d), [32][33][34][35][36] which might be beneted from the unique high entropy structure of the optimal HELDH-MC electrocatalyst. Given that high-entropy systems contain a large number of elements with signicant differences in properties, the complex synergistic effects can lead to non-linear enhancement of the material's various properties, giving rise to the "cocktail effect".…”

Section: Electrocatalytic Performancesmentioning

confidence: 77%

Novel high-entropy layered double hydroxide microspheres as an effective and durable electrocatalyst for oxygen evolution

Tong

Peng

et al. 2023

J. Mater. Chem. A

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Section: Electrocatalytic Performancesmentioning

confidence: 77%

Novel high-entropy layered double hydroxide microspheres as an effective and durable electrocatalyst for oxygen evolution

Tong

Peng

et al. 2023

J. Mater. Chem. A

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“…Figure 2d shows the thermogravimetric analysis (TGA) curves of V Co -RCO and its precursor, and the precursor exhibits a typical TGA curve of transition metal hydroxide in which the weight of the specimens dropped by 25.2% from 30 to 800 °C. 47 The weight loss of 6.8% for V Co -RCO may be ascribed to the excess oxygen near the vacancy release from the crystal lattice. The electron paramagnetic resonance (EPR) of V Co -RCO and Co 3 O 4 is shown in Figure 2e, and it can be seen that the V Co -RCO possesses more cationic vacancy concentration.…”

Section: ■ Results and Discussionmentioning

confidence: 98%

“…In addition, the partial charge density of V Co -RCO and Co 3 O 4 was calculated to analyze the electronic distribution near the vacancy. Figure d shows the thermogravimetric analysis (TGA) curves of V Co -RCO and its precursor, and the precursor exhibits a typical TGA curve of transition metal hydroxide in which the weight of the specimens dropped by 25.2% from 30 to 800 °C . The weight loss of 6.8% for V Co -RCO may be ascribed to the excess oxygen near the vacancy release from the crystal lattice.…”

Section: Resultsmentioning

confidence: 99%

Neighboring Site Synergies in Co-Defective Ru–Co Spinel Oxide toward Oxygen Evolution Reaction

Pan

Zhang

Liu

et al. 2022

ACS Sustainable Chem. Eng.

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As is well known that the oxygen evolution reaction (OER) is dominant to determine water splitting, regulating the electronic structure of the electrocatalyst has been demonstrated to be an effective strategy for improving OER activity. Herein, Ru− Co spinel oxides with abundant cobalt vacancies (V Co -RCO) are successfully developed as a highly efficient electrocatalyst for OER. Interestingly, the introduction of Ru can induce the formation of cobalt vacancies, which can modulate the electronic state of V Co -RCO, optimizing the location of the d-band center and generating neighboring Ru−Co synergies, thereby improving the OER catalytic activity. As a result, the V Co -RCO exhibits a small overpotential of 240 mV at 10 mA/cm 2 , which is more advanced than that of Co 3 O 4 , RCO without defect, and various RuO 2 catalysts. The in situ Raman analysis and density functional theory calculations further confirm the neighboring Ru−Co synergies of V Co -RCO, and this mechanism can not only facilitate fast electron transfer between Ru and Co sites through the bridging OOH but also reduce the adsorption strength of OER intermediates, leading to a significant enhancement of OER catalytic activity.

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“…Se han reportado síntesis de LDH por métodos directos e indirectos (Pizzoferrato & Richetta, 2020), como la coprecipitación, (Zaghloul et al, 2021;Wen et al, 2021) crecimiento hidrotermal, (Hu et al, 2021) síntesis sol-gel, (Pérez et al, 2020) química blanda, (Liu et al, 2021) síntesis electroquímica, (Li et al, 2021;Pan et al, 2021) intercambio aniónico, (Yao et al, 2021;Jeung et al, 2021) y aquellos en los que los LDH se utilizan como precursores (Li et al, 2013;Rybka et al, 2021). Las propiedades específicas de los LDH, como la porosidad y el área superficial, se pueden controlar variando el método y las condiciones de síntesis, lo que da lugar a una amplia gama de materiales adaptados a las aplicaciones específicas mencionadas en el párrafo anterior.…”

Section: Figura 1 Esquema Estructural De Los Materiales Tipo Hidrotal...unclassified

ELUCIDACIÓN DE LA FÓRMULA ESTEQUIOMÉTRICA DE NANOHIDROTALCITAS DE Mg Y Ni SINTETIZADAS POR EL MÉTODO DE COPRECIPITACIÓN

Rodrı́guez

Fernández

Domínguez³

et al. 2021

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Los hidróxidos dobles laminares (LDH, por sus siglas en inglés), también denominados como Hidrotalcitas (HTs), son una clase de materiales arcillosos bidimensionales conocidos por su estructura laminar única, composición versátil y propiedades de intercambio iónico. En este trabajo se reporta la determinación de la relación estequiométrica de arcillas tipo HTs sintetizadas en el laboratorio por el método de co-precipitación. El contenido de metales di y tri-valente que conforman las estructuras de las arcillas fue cuantificado por espectroscopia de absorción atómica por llama. Se sintetizaron dos tipos de HTs, Ni (HT-Ni) y Mg (HT-Mg); donde de acuerdo con los cálculos realizados la formula estequiométrica para la primera arcilla es Ni0,82Al0,18(OH)2(NO3)0,18 y Mg0,80Al0,20(OH)2(NO3)0,20 para la segunda, resultados que concuerdan perfectamente con la literatura. Las arcillas sintetizadas fueron caracterizadas por difracción de rayos X, espectroscopia FT-IR y microscopia electrónica de barrido. Los patrones de difracción de rayos X confirmaron la formación de HTs de tamaño de partícula nanométrico, donde la HT-Mg sintetizada posee mejores propiedades cristalinas.

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Composition controllable fabrication of ultrathin 2D CoMn layered double hydroxides for highly efficient electrocatalytic oxygen evolution

Cited by 21 publications

References 55 publications

Novel high-entropy layered double hydroxide microspheres as an effective and durable electrocatalyst for oxygen evolution

Novel high-entropy layered double hydroxide microspheres as an effective and durable electrocatalyst for oxygen evolution

Neighboring Site Synergies in Co-Defective Ru–Co Spinel Oxide toward Oxygen Evolution Reaction

ELUCIDACIÓN DE LA FÓRMULA ESTEQUIOMÉTRICA DE NANOHIDROTALCITAS DE Mg Y Ni SINTETIZADAS POR EL MÉTODO DE COPRECIPITACIÓN

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