How CSIRO’s ‘cactus skin’ design gives electric cars a power spike

AUSTRALIA’s CSIRO has developed a new type of membrane – inspired by the cactus – that has the potential to dramatically boost the performance of fuel cells for electric vehicles.

Working in alliance with scientists from Hanyang University in Korea, CSIRO’s cactus-inspired membrane’s water-repellant skin is said to improve the efficiency of fuel cells, in hot operating conditions, by about 400 percent.

A report on the membrane’s development recently appeared in Nature journal, where CSIRO researcher and co-author, Aaron Thornton, described the prototype skin as working in a similar way to a cactus plant, which thrives by retaining water in harsh and arid environments. 

“Fuel cells, like the ones used in electric vehicles, generate energy by mixing together simple gases, like hydrogen and oxygen,” Dr Thornton said. “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,” he said.

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. This helps it retain water,” 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,” Dr Doherty said.

Professor Young Moo Lee from Hanyang University, who led the research, said the membrane could have major implications for many industries, including the development of 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,” Prof. 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,” he said.

The cross-continent team has been working together for over 10 years. For this study, Hanyang University conceived and designed the experiments. Using characterisation and modelling expertise, CSIRO researchers were then able to determine how the membranes behaved under changing humidities.

www.csiro.au

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