Toyota is making strides in advancing hydrogen-powered vehicle technology with its innovative liquid hydrogen system design. The system, featured in the GR Corolla H2 Concept, employs a self-pressurizer to capture escaping gas and reuse it as fuel, ultimately enhancing engine efficiency. This liquid hydrogen system maintains hydrogen at an ultra-low temperature of -253 degrees Celsius during filling and storage to prevent boiling. Despite the technical complexities associated with liquid hydrogen systems, Toyota's approach aims to tackle the challenge of wasted boil-off gas. At the recent Super Taikyu Series 2024 race, Toyota showcased the self-pressurizer, which leverages the pressure from boil-off gas to increase pressure up to four times, producing reusable fuel without requiring additional energy input. The company's goal is to utilize any excess boil-off gas to power a small fuel cell package, further optimizing the efficiency of the hydrogen pump motor. According to Dr. Jacob Leachman from Washington State University, who leads the HYPER Laboratory specializing in hydrogen research, hydrogen pumps are critical components prone to failures. Toyota's development of a hydrogen pump that utilizes cold energy for compression marks a significant leap in advancing cold hydrogen vehicles. Liquid hydrogen storage presents specific challenges, as the boiling process can lead to pressure surges reaching over 140 Megapascals. Innovations like Toyota's self-pressurizer are crucial in effectively managing the complexities of liquid hydrogen systems and enhancing overall efficiency in hydrogen-powered vehicles.