Nanowire trees could deliver hydrogen fuel on mass scale

Reporting in the journal Nanoscale, the team from University of California (UC) San Diego said that nanowires, which are made from materials including silicon and zinc oxide, offer an economical way to deliver hydrogen fuel on a mass scale.

‘This is a clean way to generate clean fuel,’ said Deli Wang, professor in the Department of Electrical and Computer Engineering at the UC San Diego Jacobs School of Engineering.

In a statement, Wang said that the trees’ vertical structure and branches are key to capturing the maximum amount of solar energy because the vertical structure of trees adsorbs light while flat surfaces reflect it.

Wang’s team is said to have mimicked this structure in its so-called 3D branched nanowire array, which uses photoelectrochemical water splitting to produce hydrogen gas.

‘Hydrogen is considered to be a clean fuel compared with fossil fuel because there is no carbon emission, but the hydrogen currently used is not generated cleanly,’ said Ke Sun, a PhD student in electrical engineering who led the project.