Atomic Sulfur Passivation Improves the Photoelectrochemical Performance of ZnSe Nanorods

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Fei Huang
  • Jiajia Ning
  • Ting Shen
  • Yanling Zhao
  • Jianjun Tian

Detail(s)

Original languageEnglish
Article number1081
Number of pages13
Journal / PublicationNanomaterials
Volume10
Issue number6
Online published31 May 2020
Publication statusPublished - Jun 2020

Link(s)

Abstract

We introduced atomic sulfur passivation to tune the surface sites of heavy metal-free ZnSe nanorods, with a Zn2+-rich termination surface, which are initially capped with organic ligands and under-coordinated with Se. The S2− 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 TiO2/ZnSe photoanodes from 273 to 325 µA/cm2. Notably, without using any sacrificial agents, the photocurrent density for sulfur-passivated TiO2 /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.

Research Area(s)

  • Atomic sulfur passivation, Heavy metal-free photocatalyst, Photoelectrochemical cell, ZnS monolayer, ZnSe nanorods

Citation Format(s)

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.

In: Nanomaterials, Vol. 10, No. 6, 1081, 06.2020.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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