Selectivity of Photoelectrochemical Water Splitting on TiO <inf>2</inf> Anatase Single Crystals

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F19%3A00504553" target="_blank" >RIV/61388955:_____/19:00504553 - isvavai.cz</a>

Výsledek na webu

<a href="http://hdl.handle.net/11104/0296232" target="_blank" >http://hdl.handle.net/11104/0296232</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acs.jpcc.8b11730" target="_blank" >10.1021/acs.jpcc.8b11730</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Selectivity of Photoelectrochemical Water Splitting on TiO <inf>2</inf> Anatase Single Crystals

Popis výsledku v původním jazyce

The photoelectrochemical behaviors of (101)- and (100)-oriented anatase single crystals were compared in water oxidation in acidic as well as alkaline solutions. Both crystallographic orientations show comparable flat-band potential close to0.1 V versus reversible hydrogen electrode. The activity of anatase single crystals in water oxidation (at constant bias) decreases with increasing pH. This activity drop demonstrates shift of the photocurrent onset potential in regions close to the point of zero charge. This trend is ascribed to the gradual deprotonation of the surface OH groups and resulting negative surface charge. The activity is further affected by the cations forming the supporting electrolyte in particular, by their structure-making/breaking abilities. The apparent suppression of the photoelectrochemical water oxidation in alkaline media can be lifted in the presence on oxygen, which shifts the selectivity of the process toward ozone formation. This trend is more pronounced for (101)- than for (100)-oriented anatase, which reflects the role of surface orientation in selectivity control.

Název v anglickém jazyce

Selectivity of Photoelectrochemical Water Splitting on TiO <inf>2</inf> Anatase Single Crystals

Popis výsledku anglicky

The photoelectrochemical behaviors of (101)- and (100)-oriented anatase single crystals were compared in water oxidation in acidic as well as alkaline solutions. Both crystallographic orientations show comparable flat-band potential close to0.1 V versus reversible hydrogen electrode. The activity of anatase single crystals in water oxidation (at constant bias) decreases with increasing pH. This activity drop demonstrates shift of the photocurrent onset potential in regions close to the point of zero charge. This trend is ascribed to the gradual deprotonation of the surface OH groups and resulting negative surface charge. The activity is further affected by the cations forming the supporting electrolyte in particular, by their structure-making/breaking abilities. The apparent suppression of the photoelectrochemical water oxidation in alkaline media can be lifted in the presence on oxygen, which shifts the selectivity of the process toward ozone formation. This trend is more pronounced for (101)- than for (100)-oriented anatase, which reflects the role of surface orientation in selectivity control.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

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

2019

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

—

Svazek periodika

123

Číslo periodika v rámci svazku

17

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

11

Strana od-do

10857-10867

Kód UT WoS článku

000466988600017

EID výsledku v databázi Scopus

2-s2.0-85065151243