Photo-electrochemical activity and selectivity of nanocrystalline BaTiO3 electrodes in water oxidation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F21%3A00533063" target="_blank" >RIV/61388955:_____/21:00533063 - isvavai.cz</a>

Výsledek na webu

<a href="http://hdl.handle.net/11104/0311558" target="_blank" >http://hdl.handle.net/11104/0311558</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/elsa.202000005" target="_blank" >10.1002/elsa.202000005</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Photo-electrochemical activity and selectivity of nanocrystalline BaTiO3 electrodes in water oxidation

Popis výsledku v původním jazyce

Nanocrystalline BaTiO3 photocatalysts were prepared by spray-freeze/freezedryingnprocedure in presence of structure directing gelatin. The syntheticnapproach yields materials with particle sizes ranging between 20 and 60 nmnconforming to cubic perovskite structure. Regardless of the structural differences,nthe materials show particle size independent bandgap energy of ca.n3.27 eV. All prepared materials are photo-electrochemically active in water oxidationnwith intrinsic activity decreasing with decreasing particle size. The photoelectrochemicalnactivity of BaTiO3 in water oxidation is pH dependent with thenhole charge transfer processes being significantly suppressed in alkaline media.nSuch a behavior can be ascribed to deprotonation of surface OH groups encounterednin alkaline media that promotes surface state catalyzed electron transfernreactions at the illuminated BaTiO3 surface. The barium titanate shows the abilitynto oxidize water with formation of oxygen and ozone. The ozone formation isnpronounced on large nanocrystals particularly in acid media. No ozone formationnwas observed in alkaline solutions.

Název v anglickém jazyce

Photo-electrochemical activity and selectivity of nanocrystalline BaTiO3 electrodes in water oxidation

Popis výsledku anglicky

Nanocrystalline BaTiO3 photocatalysts were prepared by spray-freeze/freezedryingnprocedure in presence of structure directing gelatin. The syntheticnapproach yields materials with particle sizes ranging between 20 and 60 nmnconforming to cubic perovskite structure. Regardless of the structural differences,nthe materials show particle size independent bandgap energy of ca.n3.27 eV. All prepared materials are photo-electrochemically active in water oxidationnwith intrinsic activity decreasing with decreasing particle size. The photoelectrochemicalnactivity of BaTiO3 in water oxidation is pH dependent with thenhole charge transfer processes being significantly suppressed in alkaline media.nSuch a behavior can be ascribed to deprotonation of surface OH groups encounterednin alkaline media that promotes surface state catalyzed electron transfernreactions at the illuminated BaTiO3 surface. The barium titanate shows the abilitynto oxidize water with formation of oxygen and ozone. The ozone formation isnpronounced on large nanocrystals particularly in acid media. No ozone formationnwas observed in alkaline solutions.

Druh

J_ost - Ostatní články v recenzovaných periodicích

CEP obor

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OECD FORD obor

10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)

Projekt

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

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název periodika

Electrochemical Science Advances

ISSN

2698-5977

e-ISSN

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Svazek periodika

1

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

12

Strana od-do

e2000005

Kód UT WoS článku

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EID výsledku v databázi Scopus

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