Fig. 2: The characterizations of PUCC and CC.

a Low-temperature N2 adsorption/desorption isotherms of PUCC and CC. b CO2 adsorption/desorption isotherms of PUCC. c The pore size distributions of PUCC. d Strain-stress curves of PUCC and CC. e Resistivity of PUCC and CC at room temperature. f Schematic diagram of Seebeck coefficient and power factor of PUCC and CC at different temperatures (50–450 °C). The phenomena for CC (g) and PUCC (h) immersed in water. Contact angle measurements for CC (i) and PUCC (j).