Boosting the OER activity of amorphous IrOx in acidic medium by tuning its electron structure using lanthanum salt nanosheets

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Xuefeng Wang
  • Haeseong Jang
  • Haisen Li
  • Guangkai Li
  • Min Gyu Kim
  • Xuqiang Ji
  • Qing Qin
  • Xien Liu

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)2619-2625
Journal / PublicationNew Journal of Chemistry
Volume47
Issue number5
Online published30 Dec 2022
Publication statusPublished - 7 Feb 2023

Abstract

Promoting the activity of Ir-based nanomaterials for oxygen evolution reaction (OER) in acid media without losing their durability is crucial for reducing overpotentials in energy conversion, such as electrochemical water splitting. Here, a nanocomposite composed of a-IrOx and lanthanum salt (LaCO3OH) was constructed to further improve its OER activity by tuning the electronic structure of a-IrOx, because a-IrOx is a well-known critical material as the active layer of Ir-based anodic catalysts. The interaction between Ir and La via O atoms as a bridge in the catalyst IrOx/LaCO3OH, verified by X-ray absorption near edge structure spectroscopy, tunes the electronic structure of a-IrOx and thus obviously enhances its activity for the OER in acid media, compared with commercially available IrO2 as well as most of the reported Ir-based OER electrocatalysts. The overpotential of IrOx/LaCO3OH at a current density of 10 mA cm-2 is 255 mV with a Tafel slope of 55 mV dec-1. This work reveals that the strong electronic interaction between Ir- and La-based materials can efficiently improve activity and reduce energy consumption, as well as enlarging the family of acidic OER electrocatalysts.

Research Area(s)

  • EFFICIENT OXYGEN EVOLUTION, CATALYSTS, ELECTROCATALYSTS

Citation Format(s)

Boosting the OER activity of amorphous IrOx in acidic medium by tuning its electron structure using lanthanum salt nanosheets. / Wang, Xuefeng; Jang, Haeseong; Li, Zijian et al.
In: New Journal of Chemistry, Vol. 47, No. 5, 07.02.2023, p. 2619-2625.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review