Electrocatalysis of layered Group 5 metallic transition metal dichalcogenides (MX2, M = V, Nb, and Ta; X = S, Se, and Te)

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F16%3A43901914" target="_blank" >RIV/60461373:22310/16:43901914 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61989592:15310/16:33161242

Výsledek na webu

<a href="http://pubs.rsc.org/-/content/articlehtml/2016/ta/c6ta05110c" target="_blank" >http://pubs.rsc.org/-/content/articlehtml/2016/ta/c6ta05110c</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/c6ta05110c" target="_blank" >10.1039/c6ta05110c</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Electrocatalysis of layered Group 5 metallic transition metal dichalcogenides (MX2, M = V, Nb, and Ta; X = S, Se, and Te)

Popis výsledku v původním jazyce

The revelation of MoS2 as an efficient electrocatalyst for the hydrogen evolution reaction (HER) has ratcheted up interest in other transition metal dichalcogenides (TMDs). To date, extensive studies have been focused towards semiconducting Group 6 TMDs while research into metallic Group 5 TMDs has been comparatively limited. Past computational screening of Group 5 TMDs showed propitious Gibbs free energy of the adsorbed hydrogen (DGH) for HER, especially for VS2, which prompted us to experimentally explore their HER efficiency. In addition to the HER electrocatalytic performance, we examine the inherent electrochemistry and the charge-transfer property of the entire set of Group 5 TMDs in the bulk form: VS2, VSe2, VTe2, NbS2, NbSe2, NbTe2, TaS2, TaSe2 and TaTe2. We demonstrate that the nine Group 5 TMDs show distinctive inherent electroactivities arising from their intrinsic electrochemical processes or surface oxides. TaS2 possesses the fastest heterogeneous electron transfer (HET) rate at 3.4 x 10(-3) cm s(-1) amongst the Group 5 TMDs and may be ideal for electrochemical sensing. Chalcogen dependence is evident in the electrochemical charge-transfer ability of the Group 5 TMDs whereby tellurides show slower HET rates than sulfides and selenides. We identify VTe2 as the best-performing material for HER contrary to the widely predicted VS2. VTe2 manifests the lowest HER overpotential at 0.5 V vs. RHE and Tafel slope of 55 mV dec(-1).This fundamental study provides fresh insights into the electrochemical and electrocatalytic characteristics of metallic Group 5 TMDs that will be indispensable for the development of TMDs in future applications.

Název v anglickém jazyce

Electrocatalysis of layered Group 5 metallic transition metal dichalcogenides (MX2, M = V, Nb, and Ta; X = S, Se, and Te)

Popis výsledku anglicky

The revelation of MoS2 as an efficient electrocatalyst for the hydrogen evolution reaction (HER) has ratcheted up interest in other transition metal dichalcogenides (TMDs). To date, extensive studies have been focused towards semiconducting Group 6 TMDs while research into metallic Group 5 TMDs has been comparatively limited. Past computational screening of Group 5 TMDs showed propitious Gibbs free energy of the adsorbed hydrogen (DGH) for HER, especially for VS2, which prompted us to experimentally explore their HER efficiency. In addition to the HER electrocatalytic performance, we examine the inherent electrochemistry and the charge-transfer property of the entire set of Group 5 TMDs in the bulk form: VS2, VSe2, VTe2, NbS2, NbSe2, NbTe2, TaS2, TaSe2 and TaTe2. We demonstrate that the nine Group 5 TMDs show distinctive inherent electroactivities arising from their intrinsic electrochemical processes or surface oxides. TaS2 possesses the fastest heterogeneous electron transfer (HET) rate at 3.4 x 10(-3) cm s(-1) amongst the Group 5 TMDs and may be ideal for electrochemical sensing. Chalcogen dependence is evident in the electrochemical charge-transfer ability of the Group 5 TMDs whereby tellurides show slower HET rates than sulfides and selenides. We identify VTe2 as the best-performing material for HER contrary to the widely predicted VS2. VTe2 manifests the lowest HER overpotential at 0.5 V vs. RHE and Tafel slope of 55 mV dec(-1).This fundamental study provides fresh insights into the electrochemical and electrocatalytic characteristics of metallic Group 5 TMDs that will be indispensable for the development of TMDs in future applications.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CA - Anorganická chemie

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Journal of Materials Chemistry A

ISSN

2050-7488

e-ISSN

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Svazek periodika

4

Číslo periodika v rámci svazku

37

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

13

Strana od-do

14241-14253

Kód UT WoS článku

000384444200021

EID výsledku v databázi Scopus

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