Abstract
The idea of hydrogen (H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> )-powered airplanes has recently attracted a revitalized push in the aviation sector to combat carbon dioxide (CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ) emissions. However, to also reduce, or even eliminate, non-CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> emissions and contrails, the combination of H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> with all-electric solutions is undoubtedly the best option. This article explores the next wave of disruptive technological developments needed to scale up zero-emission aviation beyond 2035. With respect to conventional electrical propulsion, major breakthroughs will be needed in terms of reducing the voltage level while increasing system-level power density and overall efficiency. We show how a next-generation H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> -powered aircraft could take advantage of onboard cryogenic fuels to cool the electrical components, enabling a cryo-electric superconducting drivetrain that could lead to extraordinary performance.
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