First principles study of photocatalytic activity in ZnO-Janus van der Waals heterostructures

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21230%2F24%3A00378417" target="_blank" >RIV/68407700:21230/24:00378417 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1039/d4cp03691c" target="_blank" >https://doi.org/10.1039/d4cp03691c</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/d4cp03691c" target="_blank" >10.1039/d4cp03691c</a>

Result language

angličtina

Original language name

First principles study of photocatalytic activity in ZnO-Janus van der Waals heterostructures

Original language description

The design of type-II van der Waals (vdW) heterostructures is regarded as a promising route to produce green hydrogen via photocatalytic water splitting. To this aim, we propose novel vertically stacked vdW heterostructures based on ZnO and Janus VXY (X = Br, Cl, Y = Se, and Te) phases, and investigate their optoelectronic properties and photocatalytic performance by means of density functional theory simulations. The thermal stability of the heterostructures is confirmed by ab initio molecular dynamics simulations at 300 K. The HSE06 calculated band structures show that a specific stacking of ZnO-VBrSe and ZnO-VClSe exhibits an indirect band gap with type-II band alignment, while all other stackings exhibit a direct band gap with type-I band alignment. The type-II band alignment, along with the difference in the work function and the electrostatic potential between the ZnO and VXY monolayer, will result in a built-in electric field direct from the ZnO monolayer to the VXY monolayer which is crucial for photogenerated charge separation, and prevents the charge recombinations. The optical absorption coefficient alpha of all the considered ZnO-VXY heterostructures displays the first excitonic peak in the energy range required for photocatalysis applications. Based on the band edge potential analysis, all the studied systems are capable of starting an oxygen evolution reaction spontaneously, while some external stimuli will be required to initiate the hydrogen evolution reaction. The reported results suggest that the proposed ZnO-VXY vdW heterostructures have great potential for photocatalysis and optoelectronic device applications.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20506 - Coating and films

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

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

Publication year

2024

Confidentiality

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

Name of the periodical

Physical Chemistry Chemical Physics

ISSN

1463-9076

e-ISSN

1463-9084

Volume of the periodical

26

Issue of the periodical within the volume

47

Country of publishing house

GB - UNITED KINGDOM

Number of pages

15

Pages from-to

29283-29297

UT code for WoS article

001358741000001

EID of the result in the Scopus database

2-s2.0-85209759758