Friday, February 1, 2013

Artificial Photosynthesis using graphite Carbon Nitride


Fine chemicals and hydrogen production from water, carbon dioxide and solar energy is an ideal future chemical and energy source, independent of fossil reserves. The development of new functional molecular materials (catalyst) for the application in fine chemical and clean energy production using water and solar energy is fascinating and quite challenging, because the catalyst must be sufficiently efficient, stable, inexpensive and capable of harvesting light. 

Polymeric graphite carbon nitride (C3N4) materials are commonly available simple semiconductor photo catalyst. Being non-volatile up to 6000C even in the air with no detectable solubility or reactivity in conventional solvents, including water, alcohols, DMF, THF, diethyl ether, and toluene. Carbon nitride is considered to be extremely stable and basic in nature. It can be used as the multifunctional heterogeneous catalyst for fine chemical and pharmaceutical synthesis as well as a good organic semiconductor due to its right band gap (2.7 eV corresponding to an optical wavelength of 460 nm). 

Prof. Markus Antonietti and his team at Max Planck Institute of Colloids and Interfaces in Germany, have successfully split CO2 or photochemically turn water into hydrogen and oxygen using graphite carbon nitride. However, only four micromoles of hydrogen per hour produced out of the re-searchers' reaction vessel (quantum efficiency of the Pt modified CN is approximately 0.1% with irradiation of 420-460 nm). This opens the door to artificial photosynthesis and produce chemicals and energy from green house gas /solar energy. It will contribute to the prevention of global climate change. 

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