Cryogenic hydrogen diode Unmet Need: Efficient hydrogen cooling Increasing the efficiency of hydrogen liquefaction is critical to the use of hydrogen as a clean fuel. Upon cooling, hydrogen undergoes a spin conversion from mainly orthohydrogen to mainly parahydrogen preceding condensation. Unfortunately, this conversion is very slow and produces heat which complicates efficient hydrogen cooling. The Technology: Solid-state diode promoting spin conversion of hydrogen leading to cooling The inventors have developed a method to promote the necessary spin conversion while removing the energy produced from the spin conversion, resulting in more efficient hydrogen cooling and liquefaction. The inventors developed a solid-state diode with a voltage potential corresponding to the energy required to promote ortho-para spin state conversion in hydrogen, which allows for controlled cooling or heating of adsorbed hydrogen depending on the applied potential. Applications: Hydrogen liquefaction Utilization of waste heat Advantages: Efficient refrigeration Energy conversion Solid-state cooling Patent Information: Provisional patent filed Learn More Scott Steiger Associate Director Washington State University (509) 335-7065 scott.steiger@wsu.edu Reference No: TECH-22/3469 Bookmark this page Download as PDF Inventors Jacob Leachman John Mccloy Matthew McCluskey Scott Beckman Key Words Adsorption Advanced Materials Energy Hydrogen