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Experimental evaluation demonstrates zero-purge hydrogen drying reaching a −51.0°C dew point in water electrolysis, indicating high-efficiency gas purification without compressors.
Hydrogen dehumidification is critical for pressurized storage in water electrolysis. Conventional pressure swing adsorption (PSA) and cooling condensation suffer from severe energy penalties, purge losses, and complexity at the 1 MPa range utilized for metal hydrides. This study proposes a compressor-free, zero-purge twin-membrane dryer system integrated with a proton exchange membrane electrolyzer. The system recycles generated dry oxygen as a sweep gas for both hollow-fiber dryers, maintaining a theoretical 100% hydrogen recovery rate (zero purge loss, with only negligible membrane permeation). The product hydrogen achieved an excellent baseline dew point of −51.0°C. Oxygen concentration evaluations in hydrogen gas confirmed that oxygen contamination originates from electrolyzer crossover rather than dryer diffusion. Furthermore, post-stage molecular sieve integration is predicted to maintain a low dew point below −70°C for three years without replacement of the molecular sieve, which minimizes energy and hydrogen losses.
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Koike et al. (2026) studied this question.
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