Morphological Effects and Stabilization of the Metallic 1T Phase in Layered V-, Nb-, and Ta-Doped WSe2 for Electrocatalysis

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F18%3A43915727" target="_blank" >RIV/60461373:22310/18:43915727 - isvavai.cz</a>

Result on the web

<a href="https://onlinelibrary.wiley.com/doi/full/10.1002/chem.201704158" target="_blank" >https://onlinelibrary.wiley.com/doi/full/10.1002/chem.201704158</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/chem.201704158" target="_blank" >10.1002/chem.201704158</a>

Result language

angličtina

Original language name

Morphological Effects and Stabilization of the Metallic 1T Phase in Layered V-, Nb-, and Ta-Doped WSe2 for Electrocatalysis

Original language description

Layered transition-metal dichalcogenides ( TMDs) are valued for their electrocatalytic properties toward the hydrogen-evolution reaction ( HER) and oxygen-reduction reaction ( ORR). One effective strategy to activate the electrocatalytic properties of TMDs is through doping. The optimistic outlook of doped-MoS2 as an electrocatalyst witnessed in previous reports spurred us to examine the effect of doping WSe2 with Group 5 transition-metal species, namely V, Nb, and Ta, in aspects of inherent electroactivities and catalysis. Apart from the mild reduction signal unique to the Group 5 transition-metal dopants, the Group 5 transition-metal-doped WSe2 materials are found to possess largely identical inherent electrochemistry to the undoped WSe2 with a characteristic anodic peak. Living up to expectations, the Group 5 transition-metal-doped WSe2 materials exhibit improved electrocatalytic HER efficiency, as evident by the lower HER overpotentials and Tafel slopes relative to undoped WSe2. After doping with V, Nb, or Ta species, an increased number of active sites is observed given the distinct changes in morphology from thick bulky pieces in undoped WSe2 to thinner fragments in doped WSe2. Although undoped WSe2 exists in the semiconducting 2H phase, the Group 5 transition-metal-doped WSe2 materials are dominated by the metallic 1T phase. Doping WSe2 with V, Nb, or Ta stabilizes the catalytic 1T phase and appears to induce the transition from the 2H to 1T phase. In contrast to the enhanced HER performance of WSe2 upon doping, Group 5 transition-metal dopants proved futile in activating the ORR electrocatalytic behavior of WSe2, for which the ORR efficiency is unchanged. Therefore, these findings facilitate the understanding of the role of Group 5 transition-metal dopants in the electrochemical and catalytic properties of WSe2 relative to their morphological features and provide an evaluation of the efficacy of doping TMDs in electrocatalytic applications.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10402 - Inorganic and nuclear chemistry

Project

<a href="/en/project/GA17-11456S" target="_blank" >GA17-11456S: Layered transition metal dichalcogenides nanostructures for electrocatalysis</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Chemistry A European Journal

ISSN

0947-6539

e-ISSN

—

Volume of the periodical

24

Issue of the periodical within the volume

13

Country of publishing house

DE - GERMANY

Number of pages

10

Pages from-to

3199-3208

UT code for WoS article

000426495100021

EID of the result in the Scopus database

2-s2.0-85041636031