Mo-doping-assisted electrochemical transformation to generate CoFe LDH as the highly efficient electrocatalyst for overall water splitting

Zhao, Gaiyun; Wang, Biao; Qi, Yan; Xia, Xiaohong

doi:10.1016/j.jallcom.2022.163738

Cited by 52 publications

(10 citation statements)

References 42 publications

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“…In addition, prior literature also suggest that Mo doping could induce redistribution of the surface electron density to accelerate charge transfer and promote the formation of the *OOH intermediate for NiFe LDH structures as well. 11,68,71,75 Congruent with these prior observations, NN-12 also exhibits significantly lower charge transfer resistance ( R ct ) than the original NiFe LDH, 39 as observed from electrochemical impedance spectroscopy (Fig. S5.4, ESI†).…”

Section: Resultssupporting

confidence: 74%

“…The promising overall water splitting activity of this ML-suggested material is consistent with a recent report on Mo-doped CoFe LDH synthesized via electrochemical oxidation of CoFe Prussian-blue nanocubes, demonstrating excellent performance for overall water splitting. 11 Although studies on molybdate-intercalated CoFe are limited, molybdate intercalation into NiFe LDH structures have been widely studied, particularly for improving the electrocatalytic activity for OER. To elaborate, the molybdate species were found to facilitate the reconstruction of the OER-active M-OOH phases, [71][72][73] by undergoing dissolution and re-adsorption process at OER conditions.…”

Section: Characterisation Of the Optimized Catalystmentioning

confidence: 99%

“…5 The structure of LDHs may be described as brucite-like metal hydroxide layers, but with 3+ oxidation states metals introduced into the 2+ metal hydroxide host structure, thereby leading to the intercalation of anion between the layers to compensate for additional positive charges. 6 The electrocatalytic performances of these LDH structures have been shown to be further enhanced via diverse strategies including utilizing multimetallic compositions, 7,8 doping and defect engineering, [9][10][11][12] as well as heterostructures and hierarchical architectures. 13,14 In addition, it has been reported that introducing different intercalated ions also affect the electrochemical performance of the catalysts.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Machine learning-assisted optimization of multi-metal hydroxide electrocatalysts for overall water splitting

Lim,

I Made,

Khoo

et al. 2023

Mater. Horiz.

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show abstract

Section: Resultssupporting

confidence: 74%

Section: Characterisation Of the Optimized Catalystmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Machine learning-assisted optimization of multi-metal hydroxide electrocatalysts for overall water splitting

Lim,

I Made,

Khoo

et al. 2023

Mater. Horiz.

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“…Finally, the Cu-NiCo 2 O 4 /NF were converted into Cu-NiCo 2 S 4 /NF by using a hydrothermal method with Na 2 S•9H 2 O as a sulfur source. 31 The physical phases of all catalysts were determined by X-ray diffractometer (Figs. 2a-2b).…”

Section: Resultsmentioning

confidence: 99%

Copper-Doped NiCo₂S₄ Nanosheets Grown on Ni Foam Efficient Hydrogen Evolution Catalyst in Alkaline Solution

Li¹,

Lu²,

Ding³

et al. 2023

ECS J. Solid State Sci. Technol.

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The development of economical, efficient and stable electrocatalysts for hydrogen evolution reaction (HER) with non-precious metals remains challenging. In this work, we have prepared Cu-doped NiCo2S4 nanosheets grown on nickel foam that can serve as excellent electrocatalysts for HER in alkaline solutions (Cu-NiCo2S4/NF). The good electrocatalytic properties and excellent stability of the pristine NiCo2S4 were achieved by changing its morphology through a simple Cu doping strategy. The optimum doping ratio for the Cu-NiCo2S4/NF catalyst in the HER requires an overpotential of only 155 mV to achieve a current density of 10 mA cm-2 and can operate stably for at least 12 hours. This is mainly due to the fact that the doping of copper optimizes the electronic structure of the NiCo2S4/NF surface, providing more catalytically active sites and thus facilitating the effective release of hydrogen. In addition, the electrocatalytic activity of the Cu-NiCo2S4/NF material exceeds that of most reported noble metal-free catalysts, which also provides a new strategy for the preparation of NiCo2S4-based hydrolysis catalysts.

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“…Zhang et al demonstrated that high-valence metals such as W can adjust the electronic structure of metal oxides through experiments and theoretical calculations so that OER intermediates have the best adsorption energy. Furthermore, Zhao et al synthesized Mo-doped CoFe-LDH/NF catalysts by electrochemical transformation of Mo-doped CoFe PBA/NF, requiring 331 and 227 mV at 100 mA cm –2 for OER and HER, respectively. Yin et al synthesized a Mo-doped NiFe-LDH nanotube using a template method, which exhibited a low OER overpotential.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Electrocatalytic Activity of Mo-Doped NiFe Layered Double Hydroxide Nanosheet Arrays for the Hydrogen Evolution Reaction

Guo

Wang

Zhang

et al. 2022

ACS Appl. Nano Mater.

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NiFeMo layered double hydroxide (NiFeMo-LDH) nanosheet array structures in situ grown on Ni foam were rationally designed and fabricated by a convenient and green hydrothermal strategy. The systematic characterization proved that Ni x Fe 1 Mo 1 -LDH/NF (x = 4, 6, 8, 10) composites grew on the surface of Ni foam as vertically interlaced LDH nanosheets. The electrochemical results showed that all composites possessed high electrocatalytic activity, and Ni 6 Fe 1 Mo 1 -LDH/NF exhibited the best hydrogen evolution reaction (HER) performance. Furthermore, the nanosheet array structure with the best active metal molar ratio was in situ grown on reduced graphene oxide (rGO) uniformly modified Ni foam (∼210 nm × 20 nm) with an overpotential of 90 mV at 10 cm −2 in an alkaline solution, which was superior to most non-noble metal-based catalysts. Experimental results and density functional theory with the Hubbard U (DFT + U) calculations confirmed that the active site for H adsorption changed from the Fe site to the Mo site after Mo doping in NiFe-LDH, which reduced the water dissociation energy barrier and the subsequent proton adsorption energy barrier and adjusted the electronic structure of Fe and Ni sites, thereby greatly promoting the whole Volmer− Heyrovsky process under alkaline conditions and improving the HER performance. The synergistic coupling of NiFeMo-LDH nanosheets with rGO enhanced conductivity and electrochemical performance. The growth of NiFeMo-LDH on rGO/NF facilitated the formation of bubbles and significantly improved electrochemical stability. The present electronic regulation strategies using metal doping can be extended to synthesize other types of transition metal composite catalysts and used for the development of renewable and friendly energy devices.

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Mo-doping-assisted electrochemical transformation to generate CoFe LDH as the highly efficient electrocatalyst for overall water splitting

Cited by 52 publications

References 42 publications

Machine learning-assisted optimization of multi-metal hydroxide electrocatalysts for overall water splitting

Machine learning-assisted optimization of multi-metal hydroxide electrocatalysts for overall water splitting

Copper-Doped NiCo₂S₄ Nanosheets Grown on Ni Foam Efficient Hydrogen Evolution Catalyst in Alkaline Solution

Enhanced Electrocatalytic Activity of Mo-Doped NiFe Layered Double Hydroxide Nanosheet Arrays for the Hydrogen Evolution Reaction

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Mo-doping-assisted electrochemical transformation to generate CoFe LDH as the highly efficient electrocatalyst for overall water splitting

Cited by 52 publications

References 42 publications

Machine learning-assisted optimization of multi-metal hydroxide electrocatalysts for overall water splitting

Machine learning-assisted optimization of multi-metal hydroxide electrocatalysts for overall water splitting

Copper-Doped NiCo2S4 Nanosheets Grown on Ni Foam Efficient Hydrogen Evolution Catalyst in Alkaline Solution

Enhanced Electrocatalytic Activity of Mo-Doped NiFe Layered Double Hydroxide Nanosheet Arrays for the Hydrogen Evolution Reaction

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Copper-Doped NiCo₂S₄ Nanosheets Grown on Ni Foam Efficient Hydrogen Evolution Catalyst in Alkaline Solution