Hydrogen is an important source of renewable energy and it is very abundant in Earth. However, it is not found in the form of (H2) but is found in water. When it is found free from oxygen, it is very effecient to use hydrogen as fuel because it provides a great amount of energy. Besides, it does not pollute the air like fossil fuels do because it gives out water vapour when it gets into reaction with water.
Therefore, it is very significant to obtain hydrogen free from oxygen. Scientists and researchers from the Photovoltaic and Optoelectronic Devices group from the Universitat Jaume I, led by Professor Juan Bisquert, have done a great invention for this purpose. They have produces an artifical leaf device using semiconductor materials that generates hydrogen independently in water by the help of sunlight.
Although the device cannot produce enough hydrogen to be used as fuel, it can be considered as a great step to produce hydrogen.
You can find detailed information by checking out the following link: