Oxygen vacancy mediated step-scheme heterojunction of WO2.9/g-C3N4 for efficient electrochemical sensing of 4-nitrophenol

Excitonic effects induced via Coulomb interactions and an appropriate interfacial contact of electrode modified materials play crucial roles in transfer/separation of interfacial charge carriers during the electrochemical sensing process. Herein, an oxygen vacancy (Vo) mediated step-scheme (S-scheme...

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Autores principales:	Xiaomiao He, Saishuai Bai, Jizhou Jiang, Wee-Jun Ong, Jiahe Peng, Zhiguo Xiong, Guodong Liao, Jing Zou, Neng Li
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Oxygen vacancy Step-scheme heterojunctions WO2.9/g-C3N4 Electrochemical sensor 4-nitrophenol Chemical engineering TP155-156
Acceso en línea:	https://doaj.org/article/95bae7ed17674712aa29ebfc171abed0
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spelling	oai:doaj.org-article:95bae7ed17674712aa29ebfc171abed02021-11-18T04:53:10ZOxygen vacancy mediated step-scheme heterojunction of WO2.9/g-C3N4 for efficient electrochemical sensing of 4-nitrophenol2666-821110.1016/j.ceja.2021.100175https://doaj.org/article/95bae7ed17674712aa29ebfc171abed02021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2666821121000910https://doaj.org/toc/2666-8211Excitonic effects induced via Coulomb interactions and an appropriate interfacial contact of electrode modified materials play crucial roles in transfer/separation of interfacial charge carriers during the electrochemical sensing process. Herein, an oxygen vacancy (Vo) mediated step-scheme (S-scheme) heterojunction of WO2.9/g-C3N4 was fabricated by electrostatic self-assembly of high-purity commercial WO2.9 nanoparticles and ultrathin g-C3N4 nanosheets, where g-C3N4 nanosheets were prepared via polymerization followed ultrasonic-assisted exfoliation. The fabricated Vo-S-scheme WO2.9/g-C3N4 heterojunction-based sensor exhibited superior electrochemical performance for detecting environmental hormone 4-nitrophenol (4-NP). Due to the introduction of Vo, an increased free-charge-carriers, a built-in electric field and a high adsorption energy are generated at the heterojunction interface, which all can significantly improve the sensitivity of this proposed sensor. It also showed good reproducibility, high accuracy, good recovery, and strong feasibility for 4-NP detection in real samples. This work not only conduces significantly to understanding the defective structures and S-scheme heterojunctions, but also provides new insights into designing and constructing novel efficient electrochemical sensors.Xiaomiao HeSaishuai BaiJizhou JiangWee-Jun OngJiahe PengZhiguo XiongGuodong LiaoJing ZouNeng LiElsevierarticleOxygen vacancyStep-scheme heterojunctionsWO2.9/g-C3N4Electrochemical sensor4-nitrophenolChemical engineeringTP155-156ENChemical Engineering Journal Advances, Vol 8, Iss , Pp 100175- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Oxygen vacancy Step-scheme heterojunctions WO2.9/g-C3N4 Electrochemical sensor 4-nitrophenol Chemical engineering TP155-156
spellingShingle	Oxygen vacancy Step-scheme heterojunctions WO2.9/g-C3N4 Electrochemical sensor 4-nitrophenol Chemical engineering TP155-156 Xiaomiao He Saishuai Bai Jizhou Jiang Wee-Jun Ong Jiahe Peng Zhiguo Xiong Guodong Liao Jing Zou Neng Li Oxygen vacancy mediated step-scheme heterojunction of WO2.9/g-C3N4 for efficient electrochemical sensing of 4-nitrophenol
description	Excitonic effects induced via Coulomb interactions and an appropriate interfacial contact of electrode modified materials play crucial roles in transfer/separation of interfacial charge carriers during the electrochemical sensing process. Herein, an oxygen vacancy (Vo) mediated step-scheme (S-scheme) heterojunction of WO2.9/g-C3N4 was fabricated by electrostatic self-assembly of high-purity commercial WO2.9 nanoparticles and ultrathin g-C3N4 nanosheets, where g-C3N4 nanosheets were prepared via polymerization followed ultrasonic-assisted exfoliation. The fabricated Vo-S-scheme WO2.9/g-C3N4 heterojunction-based sensor exhibited superior electrochemical performance for detecting environmental hormone 4-nitrophenol (4-NP). Due to the introduction of Vo, an increased free-charge-carriers, a built-in electric field and a high adsorption energy are generated at the heterojunction interface, which all can significantly improve the sensitivity of this proposed sensor. It also showed good reproducibility, high accuracy, good recovery, and strong feasibility for 4-NP detection in real samples. This work not only conduces significantly to understanding the defective structures and S-scheme heterojunctions, but also provides new insights into designing and constructing novel efficient electrochemical sensors.
format	article
author	Xiaomiao He Saishuai Bai Jizhou Jiang Wee-Jun Ong Jiahe Peng Zhiguo Xiong Guodong Liao Jing Zou Neng Li
author_facet	Xiaomiao He Saishuai Bai Jizhou Jiang Wee-Jun Ong Jiahe Peng Zhiguo Xiong Guodong Liao Jing Zou Neng Li
author_sort	Xiaomiao He
title	Oxygen vacancy mediated step-scheme heterojunction of WO2.9/g-C3N4 for efficient electrochemical sensing of 4-nitrophenol
title_short	Oxygen vacancy mediated step-scheme heterojunction of WO2.9/g-C3N4 for efficient electrochemical sensing of 4-nitrophenol
title_full	Oxygen vacancy mediated step-scheme heterojunction of WO2.9/g-C3N4 for efficient electrochemical sensing of 4-nitrophenol
title_fullStr	Oxygen vacancy mediated step-scheme heterojunction of WO2.9/g-C3N4 for efficient electrochemical sensing of 4-nitrophenol
title_full_unstemmed	Oxygen vacancy mediated step-scheme heterojunction of WO2.9/g-C3N4 for efficient electrochemical sensing of 4-nitrophenol
title_sort	oxygen vacancy mediated step-scheme heterojunction of wo2.9/g-c3n4 for efficient electrochemical sensing of 4-nitrophenol
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/95bae7ed17674712aa29ebfc171abed0
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_version_	1718424928303185920

Oxygen vacancy mediated step-scheme heterojunction of WO2.9/g-C3N4 for efficient electrochemical sensing of 4-nitrophenol

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