2H -> 1T Phase Engineering of Layered Tantalum Disulfides in Electrocatalysis: Oxygen Reduction Reaction

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F17%3A43913385" target="_blank" >RIV/60461373:22310/17:43913385 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21230/17:00312114 RIV/61989592:15310/17:73584880 RIV/60461373:22810/17:43913385

Výsledek na webu

<a href="http://onlinelibrary.wiley.com/doi/10.1002/chem.201701494/full" target="_blank" >http://onlinelibrary.wiley.com/doi/10.1002/chem.201701494/full</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/chem.201701494" target="_blank" >10.1002/chem.201701494</a>

Jazyk výsledku

angličtina

Název v původním jazyce

2H -> 1T Phase Engineering of Layered Tantalum Disulfides in Electrocatalysis: Oxygen Reduction Reaction

Popis výsledku v původním jazyce

Tremendous attention is currently being paid to renewable sources of energy. Transition-metal dichalcogenides (TMDs) have been intensively studied for their promising catalytic activities in the hydrogen evolution reaction (HER) and the oxygen reduction reaction (ORR). In this fundamental work, we explored the catalytic properties of TMD family members 2HTaS(2) and 1T TaS2. Our findings reveal that both polytypes exhibit poor HER performance, which is even more pronounced after electrochemical reduction/oxidation. Our experimental data show that 1T TaS2 has a lower overpotential at a current density of -10 mA cm(-1), despite theoretical DFT calculations that indicated that the more favorable free energy of hydrogen adsorption should make &quot;perfect&quot; 2HTaS(2) a better HER catalyst. Thorough characterization showed that the higher conductivity of 1T TaS2 and a slightly higher surface oxidation of 2HTaS(2) explains this discrepancy. Moreover, changes in the catalytic activity after electrochemical treatment are addressed here. For the ORR in an alkaline environment, the electrochemical treatment led to an improvement in catalytic properties. With onset potentials similar to that of Pt/C catalysts, TaS2 was found to be an efficient catalyst for the ORR, rather than for proton reduction, in contrast to the behavior of Group 6 layered TMDs.

Název v anglickém jazyce

2H -> 1T Phase Engineering of Layered Tantalum Disulfides in Electrocatalysis: Oxygen Reduction Reaction

Popis výsledku anglicky

Tremendous attention is currently being paid to renewable sources of energy. Transition-metal dichalcogenides (TMDs) have been intensively studied for their promising catalytic activities in the hydrogen evolution reaction (HER) and the oxygen reduction reaction (ORR). In this fundamental work, we explored the catalytic properties of TMD family members 2HTaS(2) and 1T TaS2. Our findings reveal that both polytypes exhibit poor HER performance, which is even more pronounced after electrochemical reduction/oxidation. Our experimental data show that 1T TaS2 has a lower overpotential at a current density of -10 mA cm(-1), despite theoretical DFT calculations that indicated that the more favorable free energy of hydrogen adsorption should make &quot;perfect&quot; 2HTaS(2) a better HER catalyst. Thorough characterization showed that the higher conductivity of 1T TaS2 and a slightly higher surface oxidation of 2HTaS(2) explains this discrepancy. Moreover, changes in the catalytic activity after electrochemical treatment are addressed here. For the ORR in an alkaline environment, the electrochemical treatment led to an improvement in catalytic properties. With onset potentials similar to that of Pt/C catalysts, TaS2 was found to be an efficient catalyst for the ORR, rather than for proton reduction, in contrast to the behavior of Group 6 layered TMDs.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10402 - Inorganic and nuclear chemistry

Projekt

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

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Chemistry A European Journal

ISSN

0947-6539

e-ISSN

—

Svazek periodika

23

Číslo periodika v rámci svazku

33

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

10

Strana od-do

8082-8091

Kód UT WoS článku

000403150100034

EID výsledku v databázi Scopus

2-s2.0-85019971724