Hydrogen has been extensively accepted as a clean energy source to resolve the current energy shortage and environmental crisis. Byproduct like CO2 has to be removed to achieve high purity hydrogen for further usage in the produced process of hydrogen. Membrane-based gas separation technology for efficient hydrogen purification has attracted considerable attention owing to the inherent advantages over other conventional separation techniques. H2-selective membrane (Fig. 1 a) and C02-selective membrane (Fig. 1 b) are two types to separate H2-CO2 system. Our group found that CO2-selective membranes are more appropriate for high purity H2 acquisition and that H2-selective membranes are more advantageous in terms of economic cost and H2 recovery over a relatively low purity range. Currently, great efforts have been devoted to CO2-selective membrane which could avoid hydrogen recompression and fit for high purity H2 acquisition. However, most membranes have not been commercialized and applied in practical processes due to the lack of materials possessing high separation performance and stability which could meet the purity, recovery and cost requirements of hydrogen supply. Therefore, it is necessary to develop advanced membrane materials and high-performance membranes to meet increasing demands for efficient hydrogen purification.
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