Lewis-Acidic PtIr Multipods Enable High-Performance Li–O2 Batteries

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

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Author(s)

  • Yin Zhou
  • Kun Yin
  • Lu Tao
  • Yiju Li
  • Hao Tan
  • Jinhui Zhou
  • Wenshu Zhang
  • Hongbo Li
  • Shaojun Guo

Detail(s)

Original languageEnglish
Pages (from-to)26592-26598
Journal / PublicationAngewandte Chemie - International Edition
Volume60
Issue number51
Online published31 Oct 2021
Publication statusPublished - 13 Dec 2021

Abstract

The sluggish oxygen reaction kinetics concomitant with the high overpotentials and parasitic reactions from cathodes and solvents is the major challenge in aprotic lithium-oxygen (Li–O2) batteries. Herein, PtIr multipods with a low Lewis acidity of the Pt atoms are reported as an advanced cathode for improving overpotentials and stabilities. DFT calculations disclose that electrons have a strong disposition to transfer from Ir to Pt, since Pt has a higher electronegativity than Ir, resulting in a lower Lewis acidity of the Pt atoms than that on the pure Pt surface. The low Lewis acidity of Pt atoms on the PtIr surface entails a high electron density and a down-shifting of the d-band center, thereby weakening the binding energy towards intermediates (LiO2), which is the key in achieving low oxygen-reduction-reaction (ORR) and oxygen-evolution-reaction (OER) overpotentials. The Li–O2 cell based on PtIr electrodes exhibits a very low overall discharge/charge overpotential (0.44 V) and an excellent cycle life (180 cycles), outperforming the bulk of reported noble-metal-based cathodes.

Research Area(s)

  • adsorption energy, Lewis acidity, lithium–oxygen batteries, overpotentials, PtIr multipods

Citation Format(s)

Lewis-Acidic PtIr Multipods Enable High-Performance Li–O2 Batteries. / Zhou, Yin; Yin, Kun; Gu, Qianfeng et al.
In: Angewandte Chemie - International Edition, Vol. 60, No. 51, 13.12.2021, p. 26592-26598.

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