Molecular electrocatalysts for the oxidation of hydrogen and the production of hydrogen - The role of pendant amines as proton relays

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Abstract

Electrocatalysts for efficient conversion between electricity and chemical bonds will play a vital role in future systems for storage and delivery of energy. Our research on functional models of hydrogenase enzymes uses nickel and cobalt, abundant and inexpensive metals, in contrast to platinum, a precious metal used in fuel cells. A key feature of our research is a focus on the use of pendant amines incorporated into diphosphane ligands. These pendant amines function as proton relays, lowering the barrier to proton transfers to and from the catalytically active metal site. The hydride acceptor ability of metal cations, along with the basicity of pendant amines, are key thermochemical values that determine the thermodynamics of addition of H2 to a metal complex with a pendant amine incorporated into its ligand. Nickel catalysts for oxidation of H2 have turnover frequencies up to 50 s-1 (at 1 atm H2 and room temperature). Nickel and cobalt catalysts for production of H2 by reduction of protons were studied; one of them has a turnover frequency over 1000 s-1.

Original languageEnglish
Pages (from-to)1017-1027
Number of pages11
JournalEuropean Journal of Inorganic Chemistry
Issue number7
DOIs
Publication statusPublished - Mar 2011

Fingerprint

Electrocatalysts
Amines
Protons
Hydrogen
Nickel
Oxidation
Metals
Cobalt
Ligands
Hydrogenase
Catalysts
Proton transfer
Chemical bonds
Coordination Complexes
Alkalinity
Precious metals
Platinum
Hydrides
Cations
Fuel cells

Keywords

  • Electrochemistry
  • Homogeneous catalysis
  • Hydrides
  • Hydrogen
  • Proton transport

ASJC Scopus subject areas

  • Inorganic Chemistry

Cite this

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AU - Bullock, R Morris

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N2 - Electrocatalysts for efficient conversion between electricity and chemical bonds will play a vital role in future systems for storage and delivery of energy. Our research on functional models of hydrogenase enzymes uses nickel and cobalt, abundant and inexpensive metals, in contrast to platinum, a precious metal used in fuel cells. A key feature of our research is a focus on the use of pendant amines incorporated into diphosphane ligands. These pendant amines function as proton relays, lowering the barrier to proton transfers to and from the catalytically active metal site. The hydride acceptor ability of metal cations, along with the basicity of pendant amines, are key thermochemical values that determine the thermodynamics of addition of H2 to a metal complex with a pendant amine incorporated into its ligand. Nickel catalysts for oxidation of H2 have turnover frequencies up to 50 s-1 (at 1 atm H2 and room temperature). Nickel and cobalt catalysts for production of H2 by reduction of protons were studied; one of them has a turnover frequency over 1000 s-1.

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KW - Electrochemistry

KW - Homogeneous catalysis

KW - Hydrides

KW - Hydrogen

KW - Proton transport

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