Electrochemical maps and movies of the hydrogen evolution reaction on natural crystals of molybdenite (MoS<sub>2</sub>): basal vs. edge plane activity

Bentley, Cameron Luke; Kang, Myunghee; Maddar, Faduma; Li, Fengwang; Walker, Marc; Zhang, Jie; Unwin, Patrick R.

doi:10.1039/c7sc02545a

Cited by 169 publications

(215 citation statements)

References 55 publications

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“…[8,25] Die Voltammogramme zusätzlich gemessener plättchenfçrmiger Fe 4.5 Ni 4.5 S 8 -Kristalle wurden ebenfalls mit der SECCM-Technik aufgezeichnet und sind in Abbildung 3A dargestellt. Diese zeigt die Verteilung der Potentiale E bei J = 500 mA cm À2 .Als Mittelwerte wurden À0.59 V (N = 98, blau) fürd ie Positionen ohne Defekt und À0.48 V (N = 4, pink) fürd ie Positionen mit Defekt auf der (111)-Oberfläche der hexagonal-geformten Fe 4.5 Ni 4.5 S 8 -Kristalle ermittelt.…”

Section: Methodsunclassified

“…[6] Die aktivsten Materialien fürd ie elektrokatalytische Wasserstofferzeugung sind aktuell noch Platin und seine Legierungen. [8] Ausd iesem Grund rückt der Fokus stärker auf die Entwicklung potenter Alternativen, wie z. [8] Ausd iesem Grund rückt der Fokus stärker auf die Entwicklung potenter Alternativen, wie z.…”

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“…[20][21][22][23][24] Die besonderen Vorteile dieser Te chnik wurden jüngst am Beispiel des Materials MoS 2 [8,25] demonstriert. B. Fe 4.5 Ni 4.5 S 8 )g emittelt über die untersuchte Elektrodenoberfläche angegeben werden kann.…”

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“…[7] Diese sind allerdings selten, kostenintensiv und bençtigen fürd en Betrieb nicht-korrosive Elektrolytlçsungen. [8] Ausd iesem Grund rückt der Fokus stärker auf die Entwicklung potenter Alternativen, wie z. B. Übergangsmetallchalkogenide.…”

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Die lokale Oberflächenstruktur und ‐zusammensetzung bestimmt die Wasserstoffentwicklung an Eisen‐Nickelsulfiden

Bentley¹,

Andronescu

Smialkowski

et al. 2018

Angewandte Chemie

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Um leistungsfähigere Elektrokatalysatoren zu entwickeln, ist es notwendig,d en Einfluss der Oberflächenstruktur und -zusammensetzung von Materialien mit hoher lokaler Auflçsung besser zu verstehen. Dies trifft insbesondere auf die Entwicklung geeigneter Alternativen fürP latin bei der elektrokatalytischen Wasserstofferzeugung zu. Elektrochemische Rasterzellmikroskopie (scanning electrochemical cell microscopy, SECCM) wurdebenutzt, um die lokale elektrochemische Aktivitätd er Wasserstoffbildung an einkristallinen (111)-Oberflächen von Fe 4.5 Ni 4.5 S 8 ,e inem hochaktiven Elektrokatalysator fürd ie Wasserstofferzeugung, zu untersuchen. In Kombination mit strukturaufklärendenM ethoden zeigen wir, dass kleinste Veränderungen der chemischen Zusammensetzung die Aktivitätsignifikant verändern kçnnen. Somit stellen die auf der Nanoskala durchgeführten elektrochemischen Messungen, ergänzt mit lokalen strukturellen Messungen sowie Kenntnis der lokalen Zusammensetzung ein wichtiges Hilfsmittel fürd as rationale Design neuer Katalysatoren dar.

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Section: Methodsunclassified

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Die lokale Oberflächenstruktur und ‐zusammensetzung bestimmt die Wasserstoffentwicklung an Eisen‐Nickelsulfiden

Bentley¹,

Andronescu

Smialkowski

et al. 2018

Angewandte Chemie

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“…This does limit the technique to non-biological samples, since cells require a stable solution-based environment for healthy and proper function. Movies of electrochemical activity have been performed using LSV-SECCM for the hydrogen evolution reaction (HER) on MoS 2 to study the intrinsic activity of the edge and basal plane sites [127,128]. Unwin and coworkers [129] have implemented a non-raster-scan pattern following a spiral trajectory for faster imaging with SECCM.…”

Section: Fast Scanning and Imaging Movies Obtained With Sepmmentioning

confidence: 99%

Advances and Perspectives in Chemical Imaging in Cellular Environments Using Electrochemical Methods

Lazenby

White

2018

Chemosensors

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This review discusses a broad range of recent advances (2013)(2014)(2015)(2016)(2017) in chemical imaging using electrochemical methods, with a particular focus on techniques that have been applied to study cellular processes, or techniques that show promise for use in this field in the future. Non-scanning techniques such as microelectrode arrays (MEAs) offer high time-resolution (<10 ms) imaging; however, at reduced spatial resolution. In contrast, scanning electrochemical probe microscopies (SEPMs) offer higher spatial resolution (as low as a few nm per pixel) imaging, with images collected typically over many minutes. Recent significant research efforts to improve the spatial resolution of SEPMs using nanoscale probes and to improve the temporal resolution using fast scanning have resulted in movie (multiple frame) imaging with frame rates as low as a few seconds per image. Many SEPM techniques lack chemical specificity or have poor selectivity (defined by the choice of applied potential for redox-active species). This can be improved using multifunctional probes, ion-selective electrodes and tip-integrated biosensors, although additional effort may be required to preserve sensor performance after miniaturization of these probes. We discuss advances to the field of electrochemical imaging, and technological developments which are anticipated to extend the range of processes that can be studied. This includes imaging cellular processes with increased sensor selectivity and at much improved spatiotemporal resolution than has been previously customary.

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Basal Plane Hydrogen Evolution Activity from Mixed Metal Nitride MXenes Measured by Scanning Electrochemical Microscopy

Djire

Wang

Xiao

et al. 2020

Adv Funct Materials

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2D early transition metal carbide and nitride MXenes have intriguing properties for electrochemical energy storage and electrocatalysis. These properties can be manipulated by modifying the basal plane chemistry. Here, mixed transition metal nitride MXenes, M-Ti 4 N 3 T x (M = V, Cr, Mo, or Mn; T x = O and/or OH), are developed by modifying pristine exfoliated Ti 4 N 3 T x MXene with V, Cr, Mo, and Mn salts using a simple solution-based method. The resulting mixed transition metal nitride MXenes contain 6-51% metal loading (cf. Ti) that exhibit rich electrochemistry including highly tunable hydrogen evolution reaction (HER) electrocatalytic activity in a 0.5 m H 2 SO 4 electrolyte as follows: V-Ti 4 N 3 T x > Cr-Ti 4 N 3 T x > Mo-Ti 4 N 3 T x > Mn-Ti 4 N 3 T x > pristine Ti 4 N 3 T x with overpotentials as low as 330 mV at −10 mA cm −2 with a charge-transfer resistance of 70 Ω. Scanning electrochemical microscopy (SECM) reveals the electrochemical activity of individual MXene flakes. The SECM data corroborate the bulk HER activity trend for M-Ti 4 N 3 T x as well as provide the first experimental evidence that HER results from catalysis on the MXene basal plane. These electrocatalytic results demonstrate a new pathway to tune the electrochemical properties of MXenes for water splitting and related electrochemical applications.

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Electrochemical maps and movies of the hydrogen evolution reaction on natural crystals of molybdenite (MoS₂): basal vs. edge plane activity

Abstract: In this work, we report the first spatially-resolved voltammetric measurements of the hydrogen evolution reaction on natural crystals of molybdenite, unequivocally demonstrating enhanced catalytic activity on the edge plane relative to the basal plane.

Cited by 169 publications

References 55 publications

Die lokale Oberflächenstruktur und ‐zusammensetzung bestimmt die Wasserstoffentwicklung an Eisen‐Nickelsulfiden

Die lokale Oberflächenstruktur und ‐zusammensetzung bestimmt die Wasserstoffentwicklung an Eisen‐Nickelsulfiden

Advances and Perspectives in Chemical Imaging in Cellular Environments Using Electrochemical Methods

Basal Plane Hydrogen Evolution Activity from Mixed Metal Nitride MXenes Measured by Scanning Electrochemical Microscopy

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Electrochemical maps and movies of the hydrogen evolution reaction on natural crystals of molybdenite (MoS2): basal vs. edge plane activity

Abstract: In this work, we report the first spatially-resolved voltammetric measurements of the hydrogen evolution reaction on natural crystals of molybdenite, unequivocally demonstrating enhanced catalytic activity on the edge plane relative to the basal plane.

Cited by 169 publications

References 55 publications

Die lokale Oberflächenstruktur und ‐zusammensetzung bestimmt die Wasserstoffentwicklung an Eisen‐Nickelsulfiden

Die lokale Oberflächenstruktur und ‐zusammensetzung bestimmt die Wasserstoffentwicklung an Eisen‐Nickelsulfiden

Advances and Perspectives in Chemical Imaging in Cellular Environments Using Electrochemical Methods

Basal Plane Hydrogen Evolution Activity from Mixed Metal Nitride MXenes Measured by Scanning Electrochemical Microscopy

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Product

Resources

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Electrochemical maps and movies of the hydrogen evolution reaction on natural crystals of molybdenite (MoS₂): basal vs. edge plane activity