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Statements

Subject Item
n2:RIV%2F60461373%3A22310%2F14%3A43897458%21RIV15-MSM-22310___
rdf:type
n17:Vysledek skos:Concept
rdfs:seeAlso
http://pubs.acs.org/mwg-internal/de5fs23hu73ds/progress?id=RzZm3+nhg7&dl
dcterms:description
Beyond MoS2 as the first transition metal dichalcogenide (TMD) to have gained recognition as an efficient catalyst for the hydrogen evolution reaction (HER), interest in other TMD nanomaterials is steadily beginning to proliferate. This is particularly true in the field of electrochemistry, with a myriad of emerging applications ranging from catalysis to supercapacitors and solar cells. Despite this rise, current understanding of their electrochemical characteristics is especially lacking. We therefore examine the inherent electroactivities of various chemically exfoliated TMDs (MoSe2, WS2, WSe2) and their implications for sensing and catalysis of the hydrogen evolution and oxygen reduction reactions (ORR). The TMDs studied are found to possess distinctive inherent electroactivities and together with their catalytic effects for the HER are revealed to strongly depend on the chemical exfoliation route and metal-to-chalcogen composition particularly in MoSe2. Despite its inherent activity exhibiting large variations depending on the exfoliation procedure, it is also the most efficient HER catalyst with a low overpotential of ?0.36 V vs RHE (at 10 mA cm-2 current density) and fairly low Tafel slope of ?65 mV/dec after BuLi exfoliation. In addition, it demonstrates a fast heterogeneous electron transfer rate with a k0obs of 9.17 x 10-4 cm s-1 toward ferrocyanide, better than that seen for conventional glassy carbon electrodes. Knowledge of TMD electrochemistry is essential for the rational development of future applications; inherent TMD activity may potentially limit certain purposes, but intended objectives can nonetheless be achieved by careful selection of TMD compositions and exfoliation methods. Beyond MoS2 as the first transition metal dichalcogenide (TMD) to have gained recognition as an efficient catalyst for the hydrogen evolution reaction (HER), interest in other TMD nanomaterials is steadily beginning to proliferate. This is particularly true in the field of electrochemistry, with a myriad of emerging applications ranging from catalysis to supercapacitors and solar cells. Despite this rise, current understanding of their electrochemical characteristics is especially lacking. We therefore examine the inherent electroactivities of various chemically exfoliated TMDs (MoSe2, WS2, WSe2) and their implications for sensing and catalysis of the hydrogen evolution and oxygen reduction reactions (ORR). The TMDs studied are found to possess distinctive inherent electroactivities and together with their catalytic effects for the HER are revealed to strongly depend on the chemical exfoliation route and metal-to-chalcogen composition particularly in MoSe2. Despite its inherent activity exhibiting large variations depending on the exfoliation procedure, it is also the most efficient HER catalyst with a low overpotential of ?0.36 V vs RHE (at 10 mA cm-2 current density) and fairly low Tafel slope of ?65 mV/dec after BuLi exfoliation. In addition, it demonstrates a fast heterogeneous electron transfer rate with a k0obs of 9.17 x 10-4 cm s-1 toward ferrocyanide, better than that seen for conventional glassy carbon electrodes. Knowledge of TMD electrochemistry is essential for the rational development of future applications; inherent TMD activity may potentially limit certain purposes, but intended objectives can nonetheless be achieved by careful selection of TMD compositions and exfoliation methods.
dcterms:title
Electrochemistry of Transition Metal Dichalcogenides: Strong Dependence on the Metal-to-Chalcogen Composition and Exfoliation Method Electrochemistry of Transition Metal Dichalcogenides: Strong Dependence on the Metal-to-Chalcogen Composition and Exfoliation Method
skos:prefLabel
Electrochemistry of Transition Metal Dichalcogenides: Strong Dependence on the Metal-to-Chalcogen Composition and Exfoliation Method Electrochemistry of Transition Metal Dichalcogenides: Strong Dependence on the Metal-to-Chalcogen Composition and Exfoliation Method
skos:notation
RIV/60461373:22310/14:43897458!RIV15-MSM-22310___
n3:aktivita
n10:S
n3:aktivity
S
n3:cisloPeriodika
12
n3:dodaniDat
n6:2015
n3:domaciTvurceVysledku
n13:3148262 n13:5250226
n3:druhVysledku
n9:J
n3:duvernostUdaju
n5:S
n3:entitaPredkladatele
n8:predkladatel
n3:idSjednocenehoVysledku
14129
n3:idVysledku
RIV/60461373:22310/14:43897458
n3:jazykVysledku
n15:eng
n3:klicovaSlova
electrochemistry; chemical exfoliation; two-dimensional materials; dichalcogenides; transition metal chalcogenides
n3:klicoveSlovo
n11:chemical%20exfoliation n11:transition%20metal%20chalcogenides n11:two-dimensional%20materials n11:dichalcogenides n11:electrochemistry
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[895E02115F2E]
n3:nazevZdroje
ACS Nano
n3:obor
n18:CA
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
5
n3:rokUplatneniVysledku
n6:2014
n3:svazekPeriodika
8
n3:tvurceVysledku
Eng, Alex Yong Sheng Šimek, Petr Pumera, Martin Sofer, Zdeněk Ambrosi, Adriano
s:issn
1936-0851
s:numberOfPages
14
n14:doi
10.1021/nn503832j
n12:organizacniJednotka
22310