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Methane Photolysis to Clean Hydrogen and Carbon Nanotubes
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DOI：10.1039/D5EE02120K.png)
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Abstract
En 中文
The transition to sustainable hydrogen production is critical to decarbonizing the global energy system and reducing reliance on carbon-intensive methods such as steam methane reforming (SMR). Methane pyrolysis has emerged as a lower-emission alternative; yet its viability is constrained by the extreme temperatures required (600–1200 °C) and associated energy demands. Here; we present methane photolysis; CH₄(g) + hν → C(s) + 2H₂; as a novel; light-driven pathway for simultaneous hydrogen and carbon nanotube production. Operating at ambient conditions and powered by LED illumination; this scalable and continuous process selectively yields clean hydrogen with a maximum hydrogen production rate of 17.74 ± 1.71 mol cm⁻² h⁻¹ and high-value carbon nanotubes (CNTs) achieving yields of approximately 8.0 g CNT per g catalyst at a production rate of ~0.15 ± 0.001 g/h; while circumventing the thermal and carbon burdens of conventional methods. Compared to water electrolysis; our approach requires approximately 70% less energy per kilogram of H₂ produced. For CNTs; the energy savings reach ~74% relative to conventional methods such as fluidized-bed chemical vapor deposition. Techno-economic and life-cycle assessments demonstrate its potential as a scalable; energy-efficient alternative for decentralized hydrogen and carbon nanomaterial synthesis; with implications for cleaner fuel production and circular carbon utilization.
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