Activation of alpha-Fe2O3 for Photoelectrochemical Water Splitting Strongly Enhanced by Low Temperature Annealing in Low Oxygen Containing Ambient

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F20%3A73601471" target="_blank" >RIV/61989592:15310/20:73601471 - isvavai.cz</a>

Výsledek na webu

<a href="https://chemistry-europe.onlinelibrary.wiley.com/doi/full/10.1002/chem.201904430" target="_blank" >https://chemistry-europe.onlinelibrary.wiley.com/doi/full/10.1002/chem.201904430</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/chem.201904430" target="_blank" >10.1002/chem.201904430</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Activation of alpha-Fe2O3 for Photoelectrochemical Water Splitting Strongly Enhanced by Low Temperature Annealing in Low Oxygen Containing Ambient

Popis výsledku v původním jazyce

Photoelectrochemical (PEC) water splitting is a promising method for the conversion of solar energy into chemical energy stored in the form of hydrogen. Nanostructured hematite (alpha-Fe2O3) is one of the most attractive materials for a highly efficient charge carrier generation and collection due to its large specific surface area and the short minority carrier diffusion length. In the present work, the PEC water splitting performance of nanostructured alpha-Fe2O3 is investigated which was prepared by anodization followed by annealing in a low oxygen ambient (0.03 % O-2 in Ar). It was found that low oxygen annealing can activate a significant PEC response of alpha-Fe2O3 even at a low temperature of 400 degrees C and provide an excellent PEC performance compared with classic air annealing. The photocurrent of the alpha-Fe2O3 annealed in the low oxygen at 1.5 V vs. RHE results as 0.5 mA cm(-2), being 20 times higher than that of annealing in air. The obtained results show that the alpha-Fe2O3 annealed in low oxygen contains beneficial defects and promotes the transport of holes; it can be attributed to the improvement of conductivity due to the introduction of suitable oxygen vacancies in the alpha-Fe2O3. Additionally, we demonstrate the photocurrent of alpha-Fe2O3 annealed in low oxygen ambient can be further enhanced by Zn-Co LDH, which is a co-catalyst of oxygen evolution reaction. This indicates low oxygen annealing generates a promising method to obtain an excellent PEC water splitting performance from alpha-Fe2O3 photoanodes.

Název v anglickém jazyce

Activation of alpha-Fe2O3 for Photoelectrochemical Water Splitting Strongly Enhanced by Low Temperature Annealing in Low Oxygen Containing Ambient

Popis výsledku anglicky

Photoelectrochemical (PEC) water splitting is a promising method for the conversion of solar energy into chemical energy stored in the form of hydrogen. Nanostructured hematite (alpha-Fe2O3) is one of the most attractive materials for a highly efficient charge carrier generation and collection due to its large specific surface area and the short minority carrier diffusion length. In the present work, the PEC water splitting performance of nanostructured alpha-Fe2O3 is investigated which was prepared by anodization followed by annealing in a low oxygen ambient (0.03 % O-2 in Ar). It was found that low oxygen annealing can activate a significant PEC response of alpha-Fe2O3 even at a low temperature of 400 degrees C and provide an excellent PEC performance compared with classic air annealing. The photocurrent of the alpha-Fe2O3 annealed in the low oxygen at 1.5 V vs. RHE results as 0.5 mA cm(-2), being 20 times higher than that of annealing in air. The obtained results show that the alpha-Fe2O3 annealed in low oxygen contains beneficial defects and promotes the transport of holes; it can be attributed to the improvement of conductivity due to the introduction of suitable oxygen vacancies in the alpha-Fe2O3. Additionally, we demonstrate the photocurrent of alpha-Fe2O3 annealed in low oxygen ambient can be further enhanced by Zn-Co LDH, which is a co-catalyst of oxygen evolution reaction. This indicates low oxygen annealing generates a promising method to obtain an excellent PEC water splitting performance from alpha-Fe2O3 photoanodes.

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

<a href="/cs/project/EF15_003%2F0000416" target="_blank" >EF15_003/0000416: Pokročilé hybridní nanostruktury pro aplikaci v obnovitelných zdrojích energie</a><br>

Návaznosti

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

Rok uplatnění

2020

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

26

Číslo periodika v rámci svazku

12

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

8

Strana od-do

2685-2692

Kód UT WoS článku

000512441800001

EID výsledku v databázi Scopus

2-s2.0-85079443568