Charge Transfer Doping of Carbon Nitride Films through Noncovalent Iodination for Enhanced Photoelectrochemical Performance : Combined Experimental and Computational Insights

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

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Detail(s)

Original languageEnglish
Article number2200510
Journal / PublicationSmall
Volume18
Issue number46
Online published9 Oct 2022
Publication statusPublished - 17 Nov 2022

Abstract

To improve the photoelectrochemical (PEC) performance of photocatalysts, the doping strategy through covalent functionalization is often adopted to adjust material electronic structures. By contrast, this work demonstrates that the noncovalent interaction in the case of iodinated graphitic carbon nitride (g-CN) film can also enhance the PEC performance. Through a facile synthesis method of rapid thermal vapor condensation (RTVC), the prepared iodinated g-CN film shows a significantly improved photocurrent density (38.9 μA cm−2), three times that of pure g-CN film (13.0 μA cm−2) at 1.23 V versus reversible hydrogen electrode. Computations reveal that the noncovalent attachment of iodine anion (I) on g-CN plays a crucial role in modulating the bandgap states and broadening of the visible-light absorption range as well as the charge carrier separation with the photo-induced hole confined to I and electron to g-CN film. The fully filled valence orbitals (4d105s25p6) of I determine its noncovalent attachment on the g-CN film and so do the iodine species of I3, I5, etc. This work offers a favorable synthesis method to achieve efficient doping through noncovalent charge transfer between thin film and certain dopants and provides a useful modification strategy for the establishment of multi-channel transportation of charge carriers in general photocatalysts.

Research Area(s)

  • film preparation, graphitic carbon nitride, iodine doping, noncovalent interactions, photoelectrochemical performance

Citation Format(s)

Charge Transfer Doping of Carbon Nitride Films through Noncovalent Iodination for Enhanced Photoelectrochemical Performance : Combined Experimental and Computational Insights. / Tian, Haoran; Zhao, Yanling; Oo, May Thawda et al.

In: Small, Vol. 18, No. 46, 2200510, 17.11.2022.

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