Iridium complexes for electrocatalysis

US9790605B2 · kind B2 · utility

Assignee

• Yale University · US

Inventors

• Stafford W. Sheehan · North Tiverton, US
• Ulrich Hintermair · Rottendorf, DE
• Julianne M. Thomsen · Colton, US
• Gary W. Brudvig · Orange, US
• Robert H. Crabtree · Bethany, US

Key dates

• Filing date: Jun 27, 2014
• Grant date: Oct 17, 2017
• Expiry date: Feb 24, 2036

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02W10/30
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

Solution-phase (e.g., homogeneous) or surface-immobilized (e.g., heterogeneous) electrode-driven oxidation catalysts based on iridium coordination compounds which self-assemble upon chemical or electrochemical oxidation of suitable precursors and methods of making and using thereof are. Iridium species such as {[Ir(LX)x(H2O)y(μ-O)]zm+}n wherein x, y, m are integers from 0-4, z and n from 1-4 and LX is an oxidation-resistant chelate ligand or ligands, such as such as 2(2-pyridyl)-2-propanolate, form upon oxidation of various molecular iridium complexes, for instance [Cp*Ir(LX)OH] or [(cod)Ir(LX)] (Cp*=pentamethylcyclopentadienyl, cod=cis-cis,1,5-cyclooctadiene) when exposed to oxidative conditions, such as sodium periodate (NaIO4) in aqueous solution at ambient conditions.