Fig. 3: Ion-transport channels in the cell wall.
From: A high-performance watermelon skin ion-solvating membrane for electrochemical CO2 reduction
a The schematic diagram of the transport pathway of OH- in WSM1. b Pore size distribution of WSM1 obtained from PALS. c Schematic of the Grotthuss mechanism: proton transfer mechanism (I); hydroxides transfer mechanism (II); Schematic of Newton’s cradle (III). d FTIR spectra of H2O, WSM1-H2O (WSM1 fully absorbed H2O, and the surface H2O was wiped off), and WSM1-dry (the dried WSM1). e FTIR spectra of the WSM1-dry, WSM1−1M-2h-dry (the WSM1 soaked in 1 M H2SO4 solutions for 2 h and then dried), and WSM1−1M-4h-dry (WSM1 soaked in 1 M H2SO4 solutions for 4 h and then dried). f Pore size distributions of the WSM1 and WSM1-1M-2h-dry obtained from the BET method. g FTIR spectra of H2O, WSM1-H2O, and WSM1-1M-2h-H2O (After soaking WSM1 in a 1 M H2SO4 solution for 2 hours, rinse it repeatedly with deionized water, dry it, and finally fully absorb H2O). h Ion conductivity of WSM1 after acid treatment. The error bars represent the standard deviation of ion conductivity.
