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Atomic Sulfur Passivation Improves the Photoelectrochemical Performance of ZnSe Nanorods
We introduced atomic sulfur passivation to tune the surface sites of heavy metal-free ZnSe nanorods, with a Zn(2+)-rich termination surface, which are initially capped with organic ligands and under-coordinated with Se. The S(2−) ions from a sodium sulfide solution were used to partially substitute...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7353383/ https://www.ncbi.nlm.nih.gov/pubmed/32486475 http://dx.doi.org/10.3390/nano10061081 |
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author | Huang, Fei Ning, Jiajia Xiong, Wei Shen, Ting Zhao, Yanling Tian, Jianjun Zhang, Ruiqin Rogach, Andrey L. |
author_facet | Huang, Fei Ning, Jiajia Xiong, Wei Shen, Ting Zhao, Yanling Tian, Jianjun Zhang, Ruiqin Rogach, Andrey L. |
author_sort | Huang, Fei |
collection | PubMed |
description | We introduced atomic sulfur passivation to tune the surface sites of heavy metal-free ZnSe nanorods, with a Zn(2+)-rich termination surface, which are initially capped with organic ligands and under-coordinated with Se. The S(2−) ions from a sodium sulfide solution were used to partially substitute a 3-mercaptopropionic acid ligand, and to combine with under-coordinated Zn termination atoms to form a ZnS monolayer on the ZnSe surface. This treatment removed the surface traps from the ZnSe nanorods, and passivated defects formed during the previous ligand exchange process, without sacrificing the efficient hole transfer. As a result, without using any co-catalysts, the atomic sulfur passivation increased the photocurrent density of TiO(2)/ZnSe photoanodes from 273 to 325 μA/cm(2). Notably, without using any sacrificial agents, the photocurrent density for sulfur-passivated TiO(2)/ZnSe nanorod-based photoanodes remained at almost 100% of its initial value after 300 s of continuous operation, while for the post-deposited ZnS passivation layer, or those based on ZnSe/ZnS core–shell nanorods, it declined by 28% and 25%, respectively. This work highlights the advantages of the proper passivation of II-VI semiconductor nanocrystals as an efficient approach to tackle the efficient charge transfer and stability of photoelectrochemical cells based thereon. |
format | Online Article Text |
id | pubmed-7353383 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-73533832020-07-15 Atomic Sulfur Passivation Improves the Photoelectrochemical Performance of ZnSe Nanorods Huang, Fei Ning, Jiajia Xiong, Wei Shen, Ting Zhao, Yanling Tian, Jianjun Zhang, Ruiqin Rogach, Andrey L. Nanomaterials (Basel) Article We introduced atomic sulfur passivation to tune the surface sites of heavy metal-free ZnSe nanorods, with a Zn(2+)-rich termination surface, which are initially capped with organic ligands and under-coordinated with Se. The S(2−) ions from a sodium sulfide solution were used to partially substitute a 3-mercaptopropionic acid ligand, and to combine with under-coordinated Zn termination atoms to form a ZnS monolayer on the ZnSe surface. This treatment removed the surface traps from the ZnSe nanorods, and passivated defects formed during the previous ligand exchange process, without sacrificing the efficient hole transfer. As a result, without using any co-catalysts, the atomic sulfur passivation increased the photocurrent density of TiO(2)/ZnSe photoanodes from 273 to 325 μA/cm(2). Notably, without using any sacrificial agents, the photocurrent density for sulfur-passivated TiO(2)/ZnSe nanorod-based photoanodes remained at almost 100% of its initial value after 300 s of continuous operation, while for the post-deposited ZnS passivation layer, or those based on ZnSe/ZnS core–shell nanorods, it declined by 28% and 25%, respectively. This work highlights the advantages of the proper passivation of II-VI semiconductor nanocrystals as an efficient approach to tackle the efficient charge transfer and stability of photoelectrochemical cells based thereon. MDPI 2020-05-31 /pmc/articles/PMC7353383/ /pubmed/32486475 http://dx.doi.org/10.3390/nano10061081 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Huang, Fei Ning, Jiajia Xiong, Wei Shen, Ting Zhao, Yanling Tian, Jianjun Zhang, Ruiqin Rogach, Andrey L. Atomic Sulfur Passivation Improves the Photoelectrochemical Performance of ZnSe Nanorods |
title | Atomic Sulfur Passivation Improves the Photoelectrochemical Performance of ZnSe Nanorods |
title_full | Atomic Sulfur Passivation Improves the Photoelectrochemical Performance of ZnSe Nanorods |
title_fullStr | Atomic Sulfur Passivation Improves the Photoelectrochemical Performance of ZnSe Nanorods |
title_full_unstemmed | Atomic Sulfur Passivation Improves the Photoelectrochemical Performance of ZnSe Nanorods |
title_short | Atomic Sulfur Passivation Improves the Photoelectrochemical Performance of ZnSe Nanorods |
title_sort | atomic sulfur passivation improves the photoelectrochemical performance of znse nanorods |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7353383/ https://www.ncbi.nlm.nih.gov/pubmed/32486475 http://dx.doi.org/10.3390/nano10061081 |
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