Cactus-inspired skin to boost electric cars

 Inspired by the humble cactus, scientists have developed a new type of membrane that has the potential to significantly boost the performance of fuel cells and transform the electric vehicle industry.

In hot conditions the membrane, which features a water repellent skin, can improve the efficiency of fuel cells by a factor of four, researchers said.

According to Aaron Thornton from Commonwealth Scientific and Industrial Research Organisation (CSIRO) in Australia, the skin works 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. However, in order to maintain performance, proton exchange membrane fuel cells - or PEMFCs - need to stay constantly hydrated," Thornton said.

"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.

"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," CSIRO researcher Cara 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," she said.

Professor Young Moo Lee from Hanyang University, who led the research, said that this 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. This research addresses this hurdle, bringing us a step closer to fuel cell electric vehicles being more widely available," said Lee.

"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 study was published in the journal Nature.