Diminished photoisomerization of active ruthenium water oxidation catalyst by anchoring to metal oxide electrodes

Diane K. Zhong, Shengliang Zhao, Dmitry E. Polyansky, Etsuko Fujita

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Surface-binding of molecular water oxidation catalysts through phosphonated ligands offers a promising strategy for attaching homogeneous catalysts onto conductive or semiconductive oxide surfaces for heterogeneous catalysis. In this work, the highly active [Ru(tpy)(pynap)OH2]2+ (tpy = 2,2′:6′,2″-terpyridine; pynap = 2-(pyrid-2′-yl)-1,8- naphthyridine) water oxidation catalyst is attached onto metal oxide electrodes through a phosphate group. Electrochemical and photoelectrochemical results confirm that ruthenium oxidation chemistries and water oxidation proficiency remain largely unaffected by phosphonation. Surface-binding reveals minimal photoisomerization of the active d-form and allows us to evaluate photoelectrochemical and mechanistic properties of the catalyst. Spectroelectrochemical experiments support the evolution of multiple ruthenium oxidation states in agreement with Pourbaix diagrams. Although photoisomerization of d-[Ru(H2PO3-tpy)(pynap)OH 2]2+ is considerably hindered when the catalyst is attached onto a rigid oxide electrode, surface desorption remains a major challenge.

Original languageEnglish
Pages (from-to)140-147
Number of pages8
JournalJournal of Catalysis
Volume307
DOIs
Publication statusPublished - Aug 27 2013

Keywords

  • Photoisomerization
  • Ruthenium catalyst
  • Surface-binding
  • Water oxidation

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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