Pushing the limits of sodium borohydride hydrolysis for on-board hydrogen generation systems

[Display omitted] •SBH hydrolysis with 6.33 wt% hydrogen density is demonstrated.•After methanation, the produced hydrogen gas is suitable for PEMFC.•Regeneration feasibility of the product is better than commercial borax.•Reaction product can be regenerated without expensive reducing agent.•50 g/L(...

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Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2023-06, Vol.466, p.143233, Article 143233
Main Authors: Kirk, Jaewon, Kim, Yoondo, Lee, Yu-Jin, Kim, Minkyu, Min, Dong-Su, Soon Kim, Pyung, Hui Seo, Ji, Kim, Yongwoo, Lee, Jaeyong, Woo Choung, Jin, Sohn, Hyuntae, Nam, Suk-Woo, Yoon, Chang-Won, Kim, Yongmin, Jeong, Hyangsoo
Format: Article
Language:English
Subjects:
20kWe-level H2 generation system
Borax regeneration
Formic acid
Hydrogen production
Sodium borohydride
Sodium borohydride value chain
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Summary:[Display omitted] •SBH hydrolysis with 6.33 wt% hydrogen density is demonstrated.•After methanation, the produced hydrogen gas is suitable for PEMFC.•Regeneration feasibility of the product is better than commercial borax.•Reaction product can be regenerated without expensive reducing agent.•50 g/L(system) of volumetric hydrogen density is expected in automobile scale. Sodium borohydride (SBH) is a promising hydrogen (H2) carrier; however, its successful deployment has been limited to unmanned aerial vehicle applications. We reevaluated SBH hydrolysis for on-board vehicular applications from an entirely new perspective using solid-phase SBH hydrolysis with a CO2-derived acid at elevated temperatures and pressures, enabling extremely efficient water utilization. This strategy afforded a high H2 storage density of 6.33 wt%, which could be extended to 10.4 wt% via water recovery from fuel cells. High-purity H2 with carbon monoxide levels below 10 ppm was obtained after methanation. Importantly, an energy-efficient SBH regeneration method using residual NaHCO2 was developed. A 1.2-kWe-level SBH hydrogen generation was evaluated with the fuel-cell operation, and a 20-kWe-level compact system was developed with a system-based volumetric H2 storage density of 25 g-H2/L. This technology will accelerate SBH-based vehicular applications at a level of 50 g-H2/L.
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2023.143233