A bio-inspired molecular water oxidation catalyst for renewable hydrogen generation: An examination of salt effects

Robin Brimblecombe, Miriam Rotstein, Annette Koo, G Charles Dismukes, Gerhard F. Swiegers, Leone Spiccia

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Most transport fuels are derived from fossil fuels, generate greenhouse gases, and consume significant amounts of water in the extraction, purification, and/or burning processes. The generation of hydrogen using solar energy to split water, ideally from abundant water sources such as sea water or other non-potable sources, could potentially provide an unlimited, clean fuel for the future. Solar, electrochemical water splitting typically combines a photoanode at which water oxidation occurs, with a cathode for proton reduction to hydrogen. In recent work, we have found that a bioinspired tetra-manganese cluster catalyzes water oxidation at relatively low overpotentials (0.38 V) when doped into a Nafion proton conduction membrane deposited on a suitable electrode surface, and illuminated with visible light. We report here that this assembly is active in aqueous and organic electrolyte solutions containing a range of different salts in varying concentrations. Similar photocurrents were obtained using electrolytes containing 0.0 - 0.5 M sodium sulfate, sodium Perchlorate or sodium chloride. A slight decline in photocurrent was observed for sodium Perchlorate but only at and above 5.0 M concentration. In acetonitrile and acetone solutions containing 10% water, increasing the electrolyte concentration was found to result in leaching of the catalytic species from the membrane and a decrease in photocurrent. Leaching was not observed when the system was tested in an ionic liquid containing water, however, a lower photocurrent was generated than observed in aqueous electrolyte. We conclude that immersion of the membrane in an aqueous solution containing an electrolyte concentration of 0.05 - 0.5M represent good conditions for operation for the cubium/Nafion catalytic system.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Volume7408
DOIs
Publication statusPublished - 2009
EventSolar Hydrogen and Nanotechnology IV - San Diego, CA, United States
Duration: Aug 3 2009Aug 6 2009

Other

OtherSolar Hydrogen and Nanotechnology IV
CountryUnited States
CitySan Diego, CA
Period8/3/098/6/09

Fingerprint

Catalyst
Salt
Oxidation
Hydrogen
Salts
examination
salts
Water
catalysts
oxidation
Catalysts
Electrolyte
hydrogen
electrolytes
Electrolytes
photocurrents
water
Photocurrents
Sodium
leaching

Keywords

  • Hydrogen
  • Manganese cubane catalyst
  • Photocatalysis
  • Photosystem ii
  • Salt effects
  • Water oxidation

ASJC Scopus subject areas

  • Applied Mathematics
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Brimblecombe, R., Rotstein, M., Koo, A., Dismukes, G. C., Swiegers, G. F., & Spiccia, L. (2009). A bio-inspired molecular water oxidation catalyst for renewable hydrogen generation: An examination of salt effects. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 7408). [74080V] https://doi.org/10.1117/12.824840

A bio-inspired molecular water oxidation catalyst for renewable hydrogen generation : An examination of salt effects. / Brimblecombe, Robin; Rotstein, Miriam; Koo, Annette; Dismukes, G Charles; Swiegers, Gerhard F.; Spiccia, Leone.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 7408 2009. 74080V.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Brimblecombe, R, Rotstein, M, Koo, A, Dismukes, GC, Swiegers, GF & Spiccia, L 2009, A bio-inspired molecular water oxidation catalyst for renewable hydrogen generation: An examination of salt effects. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 7408, 74080V, Solar Hydrogen and Nanotechnology IV, San Diego, CA, United States, 8/3/09. https://doi.org/10.1117/12.824840
Brimblecombe R, Rotstein M, Koo A, Dismukes GC, Swiegers GF, Spiccia L. A bio-inspired molecular water oxidation catalyst for renewable hydrogen generation: An examination of salt effects. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 7408. 2009. 74080V https://doi.org/10.1117/12.824840
Brimblecombe, Robin ; Rotstein, Miriam ; Koo, Annette ; Dismukes, G Charles ; Swiegers, Gerhard F. ; Spiccia, Leone. / A bio-inspired molecular water oxidation catalyst for renewable hydrogen generation : An examination of salt effects. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 7408 2009.
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