Artificial photosynthesis

The dream of researchers in energy is to replicate the process of photosynthesis to produce hydrogen. Photosynthesis is 'the most successful solar converting mechanism on Earth' (New Scientist, 1 May 2004). In this process sunlight splits water into its constituents of oxygen, hydrogen ions and electrons.

Up to now the way plants perform this miracle has been a mystery. However, a team at Imperial College, London, may have made the crucial breakthrough, having identified a plant's photosynthetic machinery where water splitting occurs. This is called the 'catalytic core' and it provides the platform for research into artificial photosynthesis called 'artificial chloroplasts'.

The difference between natural and artificial photosynthesis is that the latter is designed only to produce hydrogen. Within the next decade it may be that scientists will have replicated nature's most ingenious process, opening up the prospect of producing hydrogen on an industrial scale, paving the way for unlimited quantities of sustainable energy (see New Scientist, 'Flower Power', 1 May 2004, pp. 28-31).

Solar cell technology will achieve its ultimate breakthrough when it is coupled to an effective electricity storage system.

A team led by Professor A. Paul Alivisatos of the University of California, Berkeley has made cheap plastic solar cells flexible enough to paint onto any surface. The task now is to raise the efficiency to ~10 per cent. This is yet another application of nanotechnology. (

Renewable Energy 101

Renewable Energy 101

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.

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