Tungsten diselenide nanoflakes can be used to chemically convert carbon dioxide to carbon monoxide in an ionic liquid. This is the new finding from researchers at the University of Illinois at Chicago whose “photosynthetic” device works using only sunlight. The new type of solar cell could be used to remove carbon from the atmosphere and produce fuel at the same time……..
http://nanotechweb.org/cws/article/tech/65760
!["Artificial leaf" solar cell](http://images.iop.org/objects/ntw/news/15/8/3/pic1.jpg ""Artificial leaf" solar cell")