Synthesis of vacant graphitic carbon nitride in argon atmosphere and its utilization for photocatalytic hydrogen generation.

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985858%3A_____%2F22%3A00560522" target="_blank" >RIV/67985858:_____/22:00560522 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61989100:27360/22:10250129 RIV/61989100:27710/22:10250129 RIV/00216208:11320/22:10455502

Výsledek na webu

<a href="https://www.nature.com/articles/s41598-022-17940-3" target="_blank" >https://www.nature.com/articles/s41598-022-17940-3</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1038/s41598-022-17940-3" target="_blank" >10.1038/s41598-022-17940-3</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Synthesis of vacant graphitic carbon nitride in argon atmosphere and its utilization for photocatalytic hydrogen generation.

Popis výsledku v původním jazyce

Graphitic carbon nitride (C3N4) was synthesised from melamine at 550 degrees C for 4 h in the argon atmosphere and then was reheated for 1-3 h at 500 degrees C in argon. Two band gaps of 2.04 eV and 2.47 eV were observed in all the synthetized materials. Based on the results of elemental and photoluminescence analyses, the lower band gap was found to be caused by the formation of vacancies. Specific surface areas of the synthetized materials were 15-18 m(2)g(-1) indicating that no thermal exfoliation occurred. The photocatalytic activity of these materials was tested for hydrogen generation. The best photocatalyst showed 3 times higher performance (1547 mu mol/g) than bulk C3N4 synthetized in the air (547 mu mol/g). This higher activity was explained by the presence of carbon (V-C) and nitrogen (V-N) vacancies grouped in their big complexes 2V(C) + 2V(N) (observed by positron annihilation spectroscopy). The effect of an inert gas on the synthesis of C3N4 was demonstrated using Graham ' s law of ammonia diffusion. This study showed that the synthesis of C3N4 from nitrogen-rich precursors in the argon atmosphere led to the formation of vacancy complexes beneficial for hydrogen generation, which was not referred so far.

Název v anglickém jazyce

Synthesis of vacant graphitic carbon nitride in argon atmosphere and its utilization for photocatalytic hydrogen generation.

Popis výsledku anglicky

Graphitic carbon nitride (C3N4) was synthesised from melamine at 550 degrees C for 4 h in the argon atmosphere and then was reheated for 1-3 h at 500 degrees C in argon. Two band gaps of 2.04 eV and 2.47 eV were observed in all the synthetized materials. Based on the results of elemental and photoluminescence analyses, the lower band gap was found to be caused by the formation of vacancies. Specific surface areas of the synthetized materials were 15-18 m(2)g(-1) indicating that no thermal exfoliation occurred. The photocatalytic activity of these materials was tested for hydrogen generation. The best photocatalyst showed 3 times higher performance (1547 mu mol/g) than bulk C3N4 synthetized in the air (547 mu mol/g). This higher activity was explained by the presence of carbon (V-C) and nitrogen (V-N) vacancies grouped in their big complexes 2V(C) + 2V(N) (observed by positron annihilation spectroscopy). The effect of an inert gas on the synthesis of C3N4 was demonstrated using Graham ' s law of ammonia diffusion. This study showed that the synthesis of C3N4 from nitrogen-rich precursors in the argon atmosphere led to the formation of vacancy complexes beneficial for hydrogen generation, which was not referred so far.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

<a href="/cs/project/GA19-15199S" target="_blank" >GA19-15199S: Nanostruktury grafitického nitridu uhlíku dopovaného nekovovými prvky pro fotokatalytické reakce</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Scientific Reports

ISSN

2045-2322

e-ISSN

2045-2322

Svazek periodika

12

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

18

Strana od-do

13622

Kód UT WoS článku

000838755800024

EID výsledku v databázi Scopus

2-s2.0-85135703865