Extended Data Fig. 5: Cyclical stability tests of BHNC block under high RH.

a, b, Digital photographs of BHNC block before (a) and after (b) water sorption at 30 °C and 90% RH for 12 h. c, Cyclical tests of milligram-level BHNC by thermogravimetric analyzer during repeated sorption-desorption cycles under 80% RH (30 °C, 80% RH for sorption and 90 °C, 4200 Pa for desorption.