“If you think about it, photosynthesis is amazing. It takes sunlight, water, and air — and then look at a tree. That’s exactly what we did, but we do it significantly better because we turn all that energy into fuel.” ~Daniel Nocera
Photosynthesis powers nearly all life on earth. The evolution of photosynthesizing organisms 3.4 billion years ago was the beginning of natural processes that have led to plants, animals and ultimately us. It is one of the most efficient energy creation processes in the natural world. However, two teams at Harvard University, led by a chemist and a biologist, may have finally created a manmade improvement on this fundamental process.
The Bionic Leaf
Together Daniel Nocera and Pamela Silver and their teams have invented a bionic leaf that produces energy ten times more efficiently than photosynthesis in plants. The ‘leaf’ is more accurately described as a living battery, although it was called a leaf as a tribute to the perfect marriage of chemistry and biology that created it.
The device uses solar energy (like a plant) from a photovoltaic panel to power the chemical reaction, which splits water from a compound into the individual elements oxygen and hydrogen. Once this reaction has occurred, microbes within the mechanism feed on the hydrogen and convert carbon dioxide into alcohol, which can later be used as fuel.
Although the system has been proven to be able to create fuel Silver sees the uses of the ‘leaf’ as much farther reaching. ‘The beauty of biology is it’s the world’s greatest chemist — biology can do chemistry we can’t do easily,’ she said. ‘In principle, we have a platform that can make any downstream carbon-based molecule. So this has the potential to be incredibly versatile.’ Continue reading →