This technology utilizes nanoscale Prussian blue material, which has the unique property of rapidly changing from blue to colorless when exposed to hydrogen gas. This stark color contrast allows for easy visual detection of hydrogen leaks directly by the naked eye or camera.
Technical Specifications and Standards:
• Composition: Insoluble mixed-valence iron cyanide compound with catalyst particles
• Color change mechanism: Reduction of Fe(III) to Fe(II) by hydrogen
• Response time: Instant color change within seconds upon hydrogen exposure
• Operating temperature range: -20°C to 80°C
• Reversibility: Color reverts upon removal of hydrogen
• Form factors: Can be synthesized as thin films, coatings, inks, paints etc.
Key Technical Advantages:
• High sensitivity and selectivity towards hydrogen gas
• Distinct blue-to-colorless transition for excellent visual contrast
• Fast response time enabling real-time leak monitoring
• Low-cost and readily available precursors with simple synthesis
• Excellent thermal and ambient stability
• Reusable and suitable for continuous monitoring
Potential Applications:
• Hydrogen fuel cell systems - Visual leak detectors for pipes, valves, tanks
• Hydrogen storage facilities - Safety monitoring of cylinders and vessels
• Aerospace and aviation - Detection of hydrogen fuel leaks
Leveraging the unique hydrogen sensing capabilities of Prussian blue enables simple yet effective visual leak detection across the entire hydrogen value chain from production to storage, transport and end-use. Prussian blue is a promising new material for enhancing hydrogen safety due to its low cost, robust performance and ease of application.