Hydrogen is hailed as a plentiful and clean energy source

which holds promise as a substitute for fossil fuels

particularly when produced through solar water splitting. However

its volatile and explosive nature necessitates stringent safety measures throughout its production

transportation

and utilization. This study analyzes hydrogen gas leakage detection by using various sensors such as ultrasonic

electrochemical

metal oxide (MOX)

catalytic

and fiber Bragg grating sensors. Various sensor technologies are developed for hydrogen leak detection

and each offers unique advantages and challenges. Fiber optic sensors

leveraging changes in light interference

provide explosion resistance and durability

while ultrasonic sensors detect leaks through sound wave analysis

albeit with limited commercial application in hydrogen environments. Schlieren imaging offers real-time visualization of hydrogen behavior

predominantly in laboratory settings. Electrochemical sensors enable reliable detection through electrochemical interactions

while MOX sensors exhibit sensitivity and ease of manufacturing

albeit with challenges related to cross-sensitivity and response times. Catalytic gas sensors and thermal conductivity sensors offer alternative detection methods

with the former catalyzing hydrogen combustion for detection and the latter measuring temperature differentials upon exposure to hydrogen. The analysis of hydrogen leakage incidents highlights the importance of robust safety measures in hydrogen infrastructure and facilities. The integration of innovative sensing technologies with automated shutdown systems and robust materials has enhanced the reliability and efficiency of leak detection systems. Continued research and cooperation are essential to address residual challenges and further enhance the safety of hydrogen utilization in various industrial sectors.