The PPF-SSEs are fabricated by ion diffusion. 0.5 g PPF nanosheets are dispersed in 50 mL 0.5 M Zn(OTf)2 trimethyl phosphate (TMP) solution under subatmospheric pressure condition and evaporates TMP solvent at 120 oC under vacuum condition for several times to get enough Zn2+ in PPF channels. After that, the PPF-SSEs are obtained by washing residual Zn(OTf)2 on the surface of PPFs with TMP and activated at 150 oC in vacuum for 12 h.
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