A twist on fuel cell technology that mimics the skin of a cactus plant could be a game-changer for the electric vehicle industry, according to the CSIRO.
The technology – co-developed by scientists at CSIRO and Korea’s Hanyang University – is a new type of water repellent membrane that can improve the efficiency of fuel cells by a factor of four.
According to CSIRO researcher and co-author Dr Aaron Thornton, the skin works in a similar way to a cactus plant, which thrives by retaining water in harsh, dry environments.
“Fuel cells, like the ones used in electric vehicles, generate energy by mixing together simple gases, like hydrogen and oxygen,” Dr Thornton said in a paper published in the Nature journal.
“However, in order to maintain performance, proton exchange membrane fuel cells – or PEMFCs – need to stay constantly hydrated.
“At the moment this is achieved by placing the cells alongside a radiator, water reservoir and a humidifier.
“The downside is that when used in a vehicle, these occupy a large amount of space and consume significant power.”
According to CSIRO researcher and co-author Cara Doherty, the team’s new cactus-inspired solution offers an alternative.
“A cactus plant has tiny cracks, called stomatal pores, which open at night when it is cool and humid, and close during the day when the conditions are hot and arid,” Dr Doherty said.
“This membrane works in a similar way. Water is generated by an electrochemical reaction, which is then regulated through nano-cracks within the skin.
“The cracks widen when exposed to humidifying conditions, and close up when it is drier.
“This means that fuel cells can remain hydrated without the need for bulky external humidifier equipment.
“We also found that the skin made the fuel cells up to four times as efficient in hot and dry conditions.”
Professor Young Moo Lee from Hanyang University, who led the research, said the development could have major implications for a number of industries, including electric vehicles.
“At the moment, one of the main barriers to the uptake of fuel cell electric vehicles is water management and heat management in fuel cell systems,” Professor Lee said.
“This research addresses this hurdle, bringing us a step closer to fuel cell electric vehicles being more widely available.
“This technique could also be applied to other existing technologies that require hydrated membranes, including devices for water treatment and gas separation.”
