Intrinsic electrocatalytic activity of a single IrOnanoparticle towards oxygen evolution reaction

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

2 Scopus Citations
View graph of relations

Author(s)

  • Minshu Du
  • Yao Meng
  • Geju Zhu
  • Mingze Gao
  • Feng Liu

Detail(s)

Original languageEnglish
Pages (from-to)22014-22021
Journal / PublicationNanoscale
Volume12
Issue number43
Online published19 Oct 2020
Publication statusPublished - 21 Nov 2020

Abstract

Identifying the intrinsic electrocatalytic activity of an individual nanoparticle is challenging as traditional ensemble measurements only provide average activity over a large number of nanoparticles and may be greatly affected by the ensemble properties, irrelevant to the nanoparticle itself. Here, single-particle collision electrochemistry is used to investigate the electrocatalytic activity of a single IrOx nanoparticle towards the oxygen evolution reaction (OER). The collision frequency is linearly proportional to the nanoparticle concentration. The mean peak current and transferred charge, extracted from current spikes of the collision, present a similar potential dependence relevant to IrOx intrinsic activity. The turnover frequency (TOF) is determined as 1.55 × 102 O2 s-1, which is orders of magnitude larger than TOFs of the reported ensemble systems. In addition, the deactivation of a single IrOx nanoparticle is also explored based on a half-width analysis of current spikes. This versatilely applicable method provides new insights into the intrinsic performance of a single nanoparticle, which is essential to reveal the structure-activity relations of nanoscale materials for the rational design of advanced catalysts.

Citation Format(s)

Intrinsic electrocatalytic activity of a single IrOnanoparticle towards oxygen evolution reaction. / Du, Minshu; Meng, Yao; Zhu, Geju; Gao, Mingze; Hsu, Hsien-Yi; Liu, Feng.

In: Nanoscale, Vol. 12, No. 43, 21.11.2020, p. 22014-22021.

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