Parameter optimisation for electrochemically activated MoTe<sub>2</sub>

McGlynn, Jessica C.; Friskey, Matthew; Ganin, Alexey Y.

doi:10.1039/d0se00684j

Cited by 9 publications

(7 citation statements)

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“…CV scans of sitosterol on graphite (as a control substrate) and MoTe 2 (which is robust toward CV measurements) demonstrate a notable shift of oxidation potential E ox . An increase of peaks on MoTe 2 in comparison to graphite indicates that the electrochemical reaction on MoTe 2 is due to the enhanced adsorption and surface complex formation (Figure S8 and discussion).…”

Section: Results and Discussionmentioning

confidence: 70%

“…According to FTIR, after deposition of sitosterol on MoTe 2 , the spectral position related to C−OH is shifted and changed in intensity, suggesting that sitosterol is facing the substrate with polar OH groups (Figure S7, Table S1, and discussion). CV scans of sitosterol on graphite (as a control substrate) and MoTe 2 (which is robust toward CV measurements) 35 demonstrate a notable shift of oxidation potential E ox . An increase of peaks on MoTe 2 in comparison to graphite indicates that the electrochemical reaction on MoTe 2 is due to the enhanced adsorption and surface complex formation (Figure S8 and discussion).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Application of a 2D Molybdenum Telluride in SERS Detection of Biorelevant Molecules

Fraser

Postnikov

Милютина

et al. 2020

ACS Appl. Mater. Interfaces

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Two-dimensional (2D) transition-metal dichalcogenides have become promising candidates for surface-enhanced Raman spectroscopy (SERS), but currently very few examples of detection of relevant molecules are available. Herein, we show the detection of the lipophilic disease marker β-sitosterol on fewlayered MoTe 2 films. The chemical vapor deposition (CVD)grown films are capable of nanomolar detection, exceeding the performance of alternative noble-metal surfaces. We confirm that the enhancement occurs through the chemical enhancement (CE) mechanism via formation of a surface−analyte complex, which leads to an enhancement factor of ≈10 4 , as confirmed by Fourier transform infrared (FTIR), UV−vis, and cyclic voltammetry (CV) analyses and density functional theory (DFT) calculations. Low values of signal deviation over a seven-layered MoTe 2 film confirms the homogeneity and reproducibility of the results in comparison to noble-metal substrate analogues. Furthermore, β-sitosterol detection within cell culture media, a minimal loss of signal over 50 days, and the opportunity for sensor regeneration suggest that MoTe 2 can become a promising new SERS platform for biosensing.

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Section: Results and Discussionmentioning

confidence: 70%

Section: ■ Results and Discussionmentioning

confidence: 99%

Application of a 2D Molybdenum Telluride in SERS Detection of Biorelevant Molecules

Fraser

Postnikov

Милютина

et al. 2020

ACS Appl. Mater. Interfaces

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“…The stability studies were carried out by measuring PXRD directly on glassy carbon electrodes using the custom-built bracket 26 on the Panalytical Xpert-Pro diffractometer with the Cu Ka (l ¼ 1.54184 A) source operating in the Bragg-Brentano geometry.…”

Section: Materials Characterisationmentioning

confidence: 99%

Revealing the activity of Co₃Mo₃N and Co₃Mo₃N_0.5 as electrocatalysts for the hydrogen evolution reaction

et al. 2022

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“…The simulation of the XRD patterns from ICSD data was carried out using Mercury 4 software [22]. The stability studies were carried out by PXRD directly on glassy carbon electrode using the fabricated bracket [23] and depicted in Figure S1.…”

Section: Materials Characterisationmentioning

confidence: 99%

The Synergistic Effects of Alloying on the Performance and Stability of Co3Mo and Co7Mo6 for the Electrocatalytic Hydrogen Evolution Reaction

Sun

Ganin

2020

Hydrogen

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Metal alloys have become a ubiquitous choice as catalysts for electrochemical hydrogen evolution in alkaline media. However, scarce and expensive Pt remains the key electrocatalyst in acidic electrolytes, making the search for earth-abundant and cheaper alternatives important. Herein, we present a facile and efficient synthetic route towards polycrystalline Co3Mo and Co7Mo6 alloys. The single-phased nature of the alloys is confirmed by X-ray diffraction and electron microscopy. When electrochemically tested, they achieve competitively low overpotentials of 115 mV (Co3Mo) and 160 mV (Co7Mo6) at 10 mA cm−2 in 0.5 M H2SO4, and 120 mV (Co3Mo) and 160 mV (Co7Mo6) at 10 mA cm−2 in 1 M KOH. Both alloys outperform Co and Mo metals, which showed significantly higher overpotentials and lower current densities when tested under identical conditions, confirming the synergistic effect of the alloying. However, the low overpotential in Co3Mo comes at the price of stability. It rapidly becomes inactive when tested under applied potential bias. On the other hand, Co7Mo6 retains the current density over time without evidence of current decay. The findings demonstrate that even in free-standing form and without nanostructuring, polycrystalline bimetallic electrocatalysts could challenge the dominance of Pt in acidic media if ways for improving their stability were found.

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Parameter optimisation for electrochemically activated MoTe₂

Abstract: MoTe2 has been shown to undergo an electrochemical activation in operando, which is evidenced by a dramatic reduction of the overpotential. This work identifies the optimum reaction conditions in which...

Cited by 9 publications

References 12 publications

Application of a 2D Molybdenum Telluride in SERS Detection of Biorelevant Molecules

Application of a 2D Molybdenum Telluride in SERS Detection of Biorelevant Molecules

Revealing the activity of Co₃Mo₃N and Co₃Mo₃N_0.5 as electrocatalysts for the hydrogen evolution reaction

The Synergistic Effects of Alloying on the Performance and Stability of Co3Mo and Co7Mo6 for the Electrocatalytic Hydrogen Evolution Reaction

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Parameter optimisation for electrochemically activated MoTe2

Abstract: MoTe2 has been shown to undergo an electrochemical activation in operando, which is evidenced by a dramatic reduction of the overpotential. This work identifies the optimum reaction conditions in which...

Cited by 9 publications

References 12 publications

Application of a 2D Molybdenum Telluride in SERS Detection of Biorelevant Molecules

Application of a 2D Molybdenum Telluride in SERS Detection of Biorelevant Molecules

Revealing the activity of Co3Mo3N and Co3Mo3N0.5 as electrocatalysts for the hydrogen evolution reaction

The Synergistic Effects of Alloying on the Performance and Stability of Co3Mo and Co7Mo6 for the Electrocatalytic Hydrogen Evolution Reaction

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Parameter optimisation for electrochemically activated MoTe₂

Revealing the activity of Co₃Mo₃N and Co₃Mo₃N_0.5 as electrocatalysts for the hydrogen evolution reaction