Nanostructured copper molybdates as promising bifunctional electrocatalysts for overall water splitting and CO<sub>2</sub>reduction

Rahmani, Atefeh; Farsi, Hossein

doi:10.1039/d0ra07783f

Cited by 29 publications

(14 citation statements)

References 115 publications

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“…We have already reported the similar observation for copper compounds containing CuO, CuMoO 4 , Cu 3 Mo 2 O 9 and CuWO 4 . 54,55 Also, the LSV of HER in the presence of CO 2 bubbling shows a cathodic peak around −0.25 V vs RHE before the sharp drop of potential for HER, which could be attributed to the adsorption and reduction of CO 2 -species. which could produce more stable carbon content materials formate and methanol.…”

Section: Ecs Advances 2022 1 020501mentioning

confidence: 96%

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Environmentally Benign Synthesis of Copper Benzenetricarboxylic Acid MOF as an Electrocatalyst for Overall Water Splitting and CO₂ Reduction

Irandoost¹,

Farsi²,

Farrokhi³

et al. 2022

ECS Adv.

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As a class of porous coordination polymers, metal organic frameworks (MOFs) have potential applications in many fields. In this work, a novel synthetic method, without using toxic solvents, has been developed to prepare HKUST-1 MOF nanoparticles from coprecipitation reaction of copper (II) chloride and 1,3,5-benzenetricarboxylic acid (trimesic acid) in distilled water. The synthesized nanoparticles were first characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM). The flat-band potential, conduction band, and valence band edges of HKUST-1 nanoparticles were experimentally determined in alkaline solution, and UV-Vis diffuse reflectance spectra (DRS) analysis showed the band gap energy to be 2.5 eV. Electrochemical working electrodes were prepared by electrophoretic deposition of HKUST-1 on the surface of a stainless steel electrode for electrochemical voltammetry and impedance measurements. For the first time the prepared HKUST-1 nanoparticles were investigated as multifunctional electrocatalysts for both overall water splitting and CO 2 reduction in alkaline solution. The Tafel plot was used to show the relationship between the over-potential (η) and the logarithmic current density, revealing the kinetic parameters of the electrochemical reactions. Furthermore, the Tafel slope was determined to be 190 mVdec −1 , indicating that the Volmer mechanism with electrochemical desorption of hydrogen acts as the rate-determining step (RDS).

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Section: Ecs Advances 2022 1 020501mentioning

confidence: 96%

“…53 On the other hand, our previous studies showed that the HER occurs on the Cu surface with zero oxidation state. 54,55 The HER activity was measured by LSV in a 0.1 M aqueous NaOH solution at scan rate of 10 mV•s −1 (Fig. 7a) where the dashed line demonstrates the standard potential of HER.…”

Section: Ecs Advances 2022 1 020501mentioning

confidence: 99%

Environmentally Benign Synthesis of Copper Benzenetricarboxylic Acid MOF as an Electrocatalyst for Overall Water Splitting and CO₂ Reduction

Irandoost¹,

Farsi²,

Farrokhi³

et al. 2022

ECS Adv.

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“…Nevertheless, its electrocatalytic activity turned out to be worse than that of another molybdate Cu 3 Mo 2 O 9 due to a larger density of catalytically active sites (copper ions) in the latter caused by the unique topology of its lattice [14]. At the same time, CuMoO 4 appears to be more promising for CO 2 reduction due to the stronger adsorption of CO 2 species at its surface [14].…”

Section: Introductionmentioning

confidence: 99%

“…Nanostructured CuMoO 4 with a crystallite size of about 134 nm was proposed recently for use as bifunctional catalysts for electrochemical water splitting and CO 2 reduction [14]. Nevertheless, its electrocatalytic activity turned out to be worse than that of another molybdate Cu 3 Mo 2 O 9 due to a larger density of catalytically active sites (copper ions) in the latter caused by the unique topology of its lattice [14]. At the same time, CuMoO 4 appears to be more promising for CO 2 reduction due to the stronger adsorption of CO 2 species at its surface [14].…”

Section: Introductionmentioning

confidence: 99%

Revealing the local structure of CuMo$_{1-x}$W$_x$O$_4$ solid solutions by multi-edge X-ray absorption spectroscopy

Pudza,

Anspoks,

Aquilanti

et al. 2022

Preprint

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The effect of tungsten substitution with molybdenum on the structure of CuMo 1−x W x O 4 (x = 0.20, 0.30, 0.50, 0.75) solid solutions was studied by multi-edge X-ray absorption spectroscopy. The simultaneous analysis of EX-AFS spectra measured at several (Cu K-edge, Mo K-edge and W L 3 -edge) absorption edges was performed by the reverse Monte Carlo method taking into account multiple-scattering effects. The degree of distortion of the coordination shells and its dependence on the composition were estimated from partial radial distribution functions (RDFs) g(r) and bond angle distribution functions (BADFs) f (ϕ). The analysis of partial RDFs suggests that the structure of solid solutions is mainly determined by the tungsten-related sublattice, while molybdenum atoms adapt to a locally distorted environment. As a result, the coordination of both tungsten and molybdenum atoms remains octahedral as in CuWO 4 for all the studied compositions.

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“…Many of the applications of CuMoO 4 involve its use in the form of nanoparticles [17][18][19]. However, the information available on the structural and mechanical properties of nanocrystalline CuMoO 4 is scarce.…”

Section: Introductionmentioning

confidence: 99%

An Investigation of the Pressure-Induced Structural Phase Transition of Nanocrystalline α-CuMoO4

2022

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The structural behavior of nanocrystalline α-CuMoO4 was studied at ambient temperature up to 2 GPa using in situ synchrotron X-ray powder diffraction. We found that nanocrystalline α-CuMoO4 undergoes a structural phase transition into γ-CuMoO4 at 0.5 GPa. The structural sequence is analogous to the behavior of its bulk counterpart, but the transition pressure is doubled. A coexistence of both phases was observed till 1.2 GPa. The phase transition gives rise to a change in the copper coordination from square-pyramidal to octahedral coordination. The transition involves a volume reduction of 13% indicating a first-order nature of the phase transition. This transformation was observed to be irreversible in nature. The pressure dependence of the unit-cell parameters was obtained and is discussed, and the compressibility analyzed.

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Nanostructured copper molybdates as promising bifunctional electrocatalysts for overall water splitting and CO₂reduction

Abstract: Comparing overall water splitting on the surface two types of copper molybdate.

Cited by 29 publications

References 115 publications

Environmentally Benign Synthesis of Copper Benzenetricarboxylic Acid MOF as an Electrocatalyst for Overall Water Splitting and CO₂ Reduction

Environmentally Benign Synthesis of Copper Benzenetricarboxylic Acid MOF as an Electrocatalyst for Overall Water Splitting and CO₂ Reduction

Revealing the local structure of CuMo$_{1-x}$W$_x$O$_4$ solid solutions by multi-edge X-ray absorption spectroscopy

An Investigation of the Pressure-Induced Structural Phase Transition of Nanocrystalline α-CuMoO4

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Nanostructured copper molybdates as promising bifunctional electrocatalysts for overall water splitting and CO2reduction

Abstract: Comparing overall water splitting on the surface two types of copper molybdate.

Cited by 29 publications

References 115 publications

Environmentally Benign Synthesis of Copper Benzenetricarboxylic Acid MOF as an Electrocatalyst for Overall Water Splitting and CO2 Reduction

Environmentally Benign Synthesis of Copper Benzenetricarboxylic Acid MOF as an Electrocatalyst for Overall Water Splitting and CO2 Reduction

Revealing the local structure of CuMo$_{1-x}$W$_x$O$_4$ solid solutions by multi-edge X-ray absorption spectroscopy

An Investigation of the Pressure-Induced Structural Phase Transition of Nanocrystalline α-CuMoO4

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Nanostructured copper molybdates as promising bifunctional electrocatalysts for overall water splitting and CO₂reduction

Environmentally Benign Synthesis of Copper Benzenetricarboxylic Acid MOF as an Electrocatalyst for Overall Water Splitting and CO₂ Reduction

Environmentally Benign Synthesis of Copper Benzenetricarboxylic Acid MOF as an Electrocatalyst for Overall Water Splitting and CO₂ Reduction