Insights into ionic association boosting water oxidation activity and dynamic stability

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

2 Scopus Citations
View graph of relations

Author(s)

  • Zanling Huang
  • Shuqi Zhu
  • Yuan Duan
  • Chaoran Pi
  • Xuming Zhang
  • Abebe Reda Woldu
  • Jing-Xin Jian
  • Qing-Xiao Tong
  • Liangsheng Hu
  • Xiangdong Yao

Detail(s)

Original languageEnglish
Pages (from-to)99-109
Journal / PublicationJournal of Energy Chemistry
Volume89
Online published3 Nov 2023
Publication statusPublished - Feb 2024

Abstract

There have been reports about Fe ions boosting oxygen evolution reaction (OER) activity of Ni-based catalysts in alkaline conditions, while the origin and reason for the enhancement remains elusive. Herein, we attempt to identify the activity improvement and discover that Ni sites act as a host to attract Fe(III) to form Fe(Ni)(III) binary centres, which serve as the dynamic sites to promote OER activity and stability by cyclical formation of intermediates (Fe(III) → Fe(Ni)(III) → Fe(Ni)–OH → Fe(Ni)–O → Fe(Ni)OOH → Fe(III)) at the electrode/electrolyte interface to emit O2. Additionally, some ions (Co(II), Ni(II), and Cr(III)) can also be the active sites to catalyze the OER process on a variety of electrodes. The Fe(III)-catalyzed overall water-splitting electrolyzer comprising bare Ni foam as the anode and Pt/Ni-Mo as the cathode demonstrates robust stability for 1600 h at 1000 mA cm−2@∼1.75 V. The results provide insights into the ion-catalyzed effects boosting OER performance. © 2023 Science Press

Research Area(s)

  • Fe(III)-catalysis, Ion-catalyzed effects, Ni-Fe binary active centers, Oxygen evolution reaction, Robust stability

Citation Format(s)

Insights into ionic association boosting water oxidation activity and dynamic stability. / Huang, Zanling; Zhu, Shuqi; Duan, Yuan et al.
In: Journal of Energy Chemistry, Vol. 89, 02.2024, p. 99-109.

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