Can we produce electricity using silk moth cocoons?

Scientists are  saying that electricity can be produced by using  silk moth cocoons.
The membrane of silk moth cocoon contains many elements such as copper,magnesium, sulphur ,etc.
Mobile charge carriers are formed by the elements in the cocoon if  we wet the cocoon. So scientists inserted a copper rod on the outer surface of the wet cocoon and aluminum rod in the inner surface of the same cocoon. They connected a small led bulb between them. The bulb has blown for 1min.