High-flux CO2-stable oxygen transport hollow fiber membranes through surface engineering

•Preparation of asymmetric LCCF hollow fiber membranes with a 22 μm dense top layer.•Oxygen permeation of supported LCCF hollow fiber is 5.10 mL min−1 cm-2 at 1000 °C.•Etched LCCF hollow fibers show oxygen permeation of 5.97 mL min−1 cm-2 at 1000 °C.•Long-term stable in 50 % CO2 with oxygen permeation of 1.66 mL min−1 cm-2 at 900 °C.