Highly efficient recovery of hydrogen from dilute H2-streams using BaCe0.7Zr0.1Y0.2O3-δ/Ni-BaCe0.7Zr0.1Y0.2O3-δ dual-layer hollow fiber membrane

The schematic diagram of the dual-layer hollow fiber hydrogen pump for H 2 separation. • The ceramic cell could separate H 2 from dilute H 2 -streams with ≥ 80% H 2 recovery. • The dual-layer hollow fiber easily integrates electrolytes and electrodes. • Higher temperatures (≥500℃) and higher voltages decrease Faraday efficiency. BaCe 0.7 Zr 0.1 Y 0.2 O 3-δ /Ni-BaCe 0.7 Zr 0.1 Y 0.2 O 3-δ dual-layer hollow fiber membranes are prepared by a co-spinning/co-sintering method, which is a simple and practical technique to integrate the electrolyte (BaCe 0.7 Zr 0.1 Y 0.2 O 3-δ ) and the electrode (Ni-BaCe 0.7 Zr 0.1 Y 0.2 O 3-δ ). A galvanic hydrogen pump is assembled by using this dual-layer hollow fiber membrane for hydrogen separation from dilute H 2 streams, in which the hydrogen permeation can be moderately controlled by the applied voltage. At 550℃ and 2 V voltage, a hydrogen flux of 2.15 mL·min −1 ·cm −2 and a hydrogen recovery rate of 81% are obtained when the feed is low concentration (13 vol%) H 2 stream. The one-step manufacturing method of integrating electrolytes and electrodes can be regarded as a more efficient method for the mass production of micro-tubular galvanic hydrogen pumps.