Layered SnS versus SnS2: Valence and Structural Implications on Electrochemistry and Clean Energy Electrocatalysis

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F16%3A43901887" target="_blank" >RIV/60461373:22310/16:43901887 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61989592:15310/16:33161244

Výsledek na webu

<a href="http://pubs.acs.org/doi/abs/10.1021/acs.jpcc.6b06977" target="_blank" >http://pubs.acs.org/doi/abs/10.1021/acs.jpcc.6b06977</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acs.jpcc.6b06977" target="_blank" >10.1021/acs.jpcc.6b06977</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Layered SnS versus SnS2: Valence and Structural Implications on Electrochemistry and Clean Energy Electrocatalysis

Popis výsledku v původním jazyce

Despite the far-reaching applications of layered Sn chalcogenides to date, their electrochemistry and electrochemical and electrocatalytic properties remain a mystery. The bulk of current research highlights promising uses of layered Sn chalcogenides with limited discourse on the relevance of Sn valency or crystal structures to their properties. We therefore examine the electrochemistry of orthorhombic SnS and hexagonal SnS2, and determine the implications to their electrocatalytic applications, namely, oxygen reduction reaction (ORR), oxygen evolution reaction (OER), and hydrogen evolution reaction (HER). Higher inherent electroactivity has been demonstrated in SnS2 as indicated by three distinct cathodic signals juxtaposed with a broad reduction peak in the largely electro-inactive SnS. In addition, SnS2 exhibits a faster heterogeneous electron transfer (HET) rate than SnS, though both are of less-than-sterling showing when compared to the glassy carbon (GC) electrode in terms of current intensity. The low onset potentials and current do not auger well for SnS and SnS, as electrocatalysts for ORR and OER. Contrarily, both Sn chalcogenides fare better as HER electrocatalysts, surpassing the GC electrode. SnS2 exudes stronger HER electrocatalytic behavior than SnS. The differing HER performance is explained by means of HER electrode kinetics and density functional theory (DFT) calculation. Using electrochemical impedance spectroscopy (EIS), SnS2 demonstrates significantly faster HER kinetics than SnS. The DFT study unveiled that the high electrocatalytic showing of SnS2 originated from the propitious Delta G(H) at the S edges. Conversely, Delta G(H) of SnS at all edges are disadvantageous for HER. The results provide crucial knowledge on the electrochemistry and electrocatalysis of Sn chalcogenides and create opportunities for future developments.

Název v anglickém jazyce

Layered SnS versus SnS2: Valence and Structural Implications on Electrochemistry and Clean Energy Electrocatalysis

Popis výsledku anglicky

Despite the far-reaching applications of layered Sn chalcogenides to date, their electrochemistry and electrochemical and electrocatalytic properties remain a mystery. The bulk of current research highlights promising uses of layered Sn chalcogenides with limited discourse on the relevance of Sn valency or crystal structures to their properties. We therefore examine the electrochemistry of orthorhombic SnS and hexagonal SnS2, and determine the implications to their electrocatalytic applications, namely, oxygen reduction reaction (ORR), oxygen evolution reaction (OER), and hydrogen evolution reaction (HER). Higher inherent electroactivity has been demonstrated in SnS2 as indicated by three distinct cathodic signals juxtaposed with a broad reduction peak in the largely electro-inactive SnS. In addition, SnS2 exhibits a faster heterogeneous electron transfer (HET) rate than SnS, though both are of less-than-sterling showing when compared to the glassy carbon (GC) electrode in terms of current intensity. The low onset potentials and current do not auger well for SnS and SnS, as electrocatalysts for ORR and OER. Contrarily, both Sn chalcogenides fare better as HER electrocatalysts, surpassing the GC electrode. SnS2 exudes stronger HER electrocatalytic behavior than SnS. The differing HER performance is explained by means of HER electrode kinetics and density functional theory (DFT) calculation. Using electrochemical impedance spectroscopy (EIS), SnS2 demonstrates significantly faster HER kinetics than SnS. The DFT study unveiled that the high electrocatalytic showing of SnS2 originated from the propitious Delta G(H) at the S edges. Conversely, Delta G(H) of SnS at all edges are disadvantageous for HER. The results provide crucial knowledge on the electrochemistry and electrocatalysis of Sn chalcogenides and create opportunities for future developments.

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

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Journal of Physical Chemistry C

ISSN

1932-7447

e-ISSN

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Svazek periodika

120

Číslo periodika v rámci svazku

42

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

14

Strana od-do

24098-24111

Kód UT WoS článku

000386640800022

EID výsledku v databázi Scopus

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