Electric planes are coming: Short-hop regional flights could be running on batteries in a few years

Hydrogen fuel has been around a very long time, and when it’s green hydrogen – produced with water and electrolysis powered by renewable energy – it doesn’t produce carbon dioxide. It can also hold more energy per unit of mass than batteries.

There are two ways to use hydrogen in an airplane: either in place of regular jet fuel in an engine, or combined with oxygen to power hydrogen fuel cells, which then generate electricity to power the aircraft.

The problem is volume – hydrogen gas takes up a lot of space. That’s why engineers are looking at methods like keeping it very cool so it can be stored as liquid until it’s burned as a gas. It still takes up more space than jet fuel, and the storage tanks are heavy, so how to store, handle or distribute it on aircraft is still being worked out.

Airbus is doing a lot of research on hydrogen combustion using modified gas turbine engines with an A380 platform, and aiming to have mature technology by 2025. Australia’s Rex airline expects to start testing a 34-seat, hydrogen-electric airplane for short hops in the next few years.

Due to the variety of options, I see hydrogen as one of the key technologies for sustainable aviation.

The problem with aviation emissions isn’t their current levels – it’s the fear that their emissions will increase rapidly as demand increases. By 2050, we could see three to five times more carbon dioxide emissions from aviation than before the pandemic.

The International Civil Aviation Organization, a United Nations agency, generally defines the industry’s goals, looking at what’s feasible and how aviation can push the boundaries.

Its long-term goal is to cut net carbon dioxide emissions 50% by 2050 compared with 2005 levels. Getting there will require a mix of different technologies and optimization. I don’t know if we’re going to be able to reach it by 2050, but I believe we must do everything we can to make future aviation environmentally sustainable.

This article is republished from The Conversation, an independent nonprofit news site dedicated to sharing ideas from academic experts. It was written by: Gökçin Çınar, University of Michigan. The Conversation has a variety of fascinating free newsletters.

Gökçin Çınar receives research funding from the government and other entities to work on sustainable aviation technologies.