A nickel (II) PY5 complex as an electrocatalyst for water oxidation

Research output: Contribution to journalArticle

Abstract

A Ni-PY5 [PY5 = 2,6-bis(1,1-bis(2-pyridyl)ethyl)pyridine)] complex has been found to act as an electrocatalyst for oxidizing water to dioxygen in aqueous phosphate buffer solutions. The rate of water oxidation catalyzed by the Ni-PY5 is remarkably enhanced by the proton acceptor base HPO42−, with rate constant of 1820 M−1 s−1. Controlled potential bulk electrolysis with Ni-PY5 at pH 10.8 under an applied potential of 1.5 V vs. normal hydrogen electrode (NHE) resulted in dioxygen formation with a high faradaic efficiency over 90%. A detailed mechanistic study identifies the water nucleophilic attack pathway for water oxidation catalysis.

Details

Authors
  • Lei Wang
  • Lele Duan
  • Ram B. Ambre
  • Quentin Daniel
  • Hong Chen
  • Junliang Sun
  • Biswanath Das
  • Anders Thapper
  • Jens Uhlig
  • Peter Dinér
  • Licheng Sun
Organisations
External organisations
  • KTH Royal Institute of Technology
  • Stockholm University
  • Uppsala University
  • Dalian University of Technology
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Physical Chemistry
Original languageEnglish
Pages (from-to)72-78
Number of pages7
JournalJournal of Catalysis
Volume335
Publication statusPublished - 2016 Mar 1
Publication categoryResearch
Peer-reviewedYes