New Water Splitting Catalyst Could Make it Easier to Generate Solar Fuel

Water splitting, the process of harvesting solar energy to generate energy-dense fuels, could be simplified thanks to new research.

A Research team, led by Louis Piper, Associate Professor of Physics, Binghamton University and researchers from Diamond Light Source and Brookhaven National Laboratory, figured out how “doping” (or adding metal ions) into vanadium pentoxide (M-V2O5) nanowires raises the highest filled energy levels for more efficient hole transfer from the quantum dots to nanowires i.e. separation of the photo-excited electrons and holes.

“The key idea is to generate a solar fuel: hydrogen gas, which can be burnt to release energy on demand without releasing carbon dioxide,” said Piper. “For water splitting, we use visible light to generate photo-excited negative electrons and positive holes that are then separated in order to catalyse water into oxygen and hydrogen gases. Storing gases is more straightforward (and cheaper) than employing battery set-ups, so this approach has the benefit of clean energy harvesting and storage.”

“If you don’t dope, then there is a buildup of positive holes that corrode the quantum dots (referred to as photo-corrosion),” said Piper. “Using computation and chemical intuition, we predicted doping with Sn2+ ions would result in excellent energy alignment and efficient charge separation. We saw a ten-fold increase in the amount of solar-harvested hydrogen we obtained.”

The researchers are now working with their collaborators at the University of Buffalo and Texas A&M University to enhance the hydrogen gas evolution by decorating the quantum dots with platinum.

“We expect platinum to improve things by acting as a catalytic site for the electrons, but our ultimate goal is to find less costly alternatives to decorate with,” added Piper.

Their study was published in the Journal of the American Chemical Society.