Cation-Controlled Electrocatalytical Activity of Transition-Metal Disulfides

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F18%3A43915725" target="_blank" >RIV/60461373:22310/18:43915725 - isvavai.cz</a>

Výsledek na webu

<a href="https://pubs.acs.org/doi/pdf/10.1021/acscatal.7b04233" target="_blank" >https://pubs.acs.org/doi/pdf/10.1021/acscatal.7b04233</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acscatal.7b04233" target="_blank" >10.1021/acscatal.7b04233</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Cation-Controlled Electrocatalytical Activity of Transition-Metal Disulfides

Popis výsledku v původním jazyce

The nanostructured layered transition-metal dichalcogenides are highly promising materials for substitution of platinum metals in electrocatalysis. These layered materials are usually exfoliated with intercalation of Li from organolithium compounds. Alkali metal intercalation leads not only to exfoliation and increased surface area but also, even more importantly, to conversion of naturally occurring 2H (trigonal prismatic) semiconducting phase of MoS2/WS2 to IT octahedral conducting phase, which also exhibits better electrocatalytical performance. Surprisingly, even for the most broadly studied members like MoS2 and WS2, systematic work on their exfoliation is missing. We present a detailed study of MoS2 and WS2 exfoliation by intercalating cations of variable size (Li, Na, K, Rb, Cs). Alkali metal naphtalenides that are capable of producing single layer exfoliated dichalcogenides in quantitative yield were used. The results show strong dependence of dichalcogenide exfoliation on cation ionic radii. The cation has also a significant influence on the 1T/2H phase ratio in the resulting exfoliated materials. The overpotential and Tafel slopes directly correlate with the concentration of 1T phase. Our findings have broad fundamental implications as well as practical applications because by choosing the intercalating ion, one can tailor the exfoliation procedure.

Název v anglickém jazyce

Cation-Controlled Electrocatalytical Activity of Transition-Metal Disulfides

Popis výsledku anglicky

The nanostructured layered transition-metal dichalcogenides are highly promising materials for substitution of platinum metals in electrocatalysis. These layered materials are usually exfoliated with intercalation of Li from organolithium compounds. Alkali metal intercalation leads not only to exfoliation and increased surface area but also, even more importantly, to conversion of naturally occurring 2H (trigonal prismatic) semiconducting phase of MoS2/WS2 to IT octahedral conducting phase, which also exhibits better electrocatalytical performance. Surprisingly, even for the most broadly studied members like MoS2 and WS2, systematic work on their exfoliation is missing. We present a detailed study of MoS2 and WS2 exfoliation by intercalating cations of variable size (Li, Na, K, Rb, Cs). Alkali metal naphtalenides that are capable of producing single layer exfoliated dichalcogenides in quantitative yield were used. The results show strong dependence of dichalcogenide exfoliation on cation ionic radii. The cation has also a significant influence on the 1T/2H phase ratio in the resulting exfoliated materials. The overpotential and Tafel slopes directly correlate with the concentration of 1T phase. Our findings have broad fundamental implications as well as practical applications because by choosing the intercalating ion, one can tailor the exfoliation procedure.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10402 - Inorganic and nuclear chemistry

Projekt

<a href="/cs/project/GA17-11456S" target="_blank" >GA17-11456S: Nanostruktury vrstevnatých dichalkogenidů přechodných kovů pro elektrokatalýzu</a><br>

Návaznosti

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

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

ACS Catalysis

ISSN

2155-5435

e-ISSN

—

Svazek periodika

8

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

2774-2781

Kód UT WoS článku

000430154100018

EID výsledku v databázi Scopus

2-s2.0-85045107652