The sodium alginate (SA) cation layer was modified by copper octocarboxyphthalocyanine or copper phthalocyanine tetrasulfonic acid

and the chitosan (CS) anion layer was modified by copper tetraaminophthalocyanine to prepare the modified SA/CS bipolar membranes (BPMs).The BPMs were characterized using TG

electric universal testing machine

contact angle measurer and J-V investigation.Experimental results showed that the thermal stability

mechanical properties and hydrophilicity of the BPMs were increased.After modification

high charge density area formed in the interlayer.As the catalytic centers of water splitting in the interlayer

metallophthalocyanine derivatives sped up water splitting into hydrogen ions and hydroxide ions

and lowered the IR drop of the BPMs.The metallophthalocyanine derivatives with dissimilar substituents showed different catalytic ability to water splitting in BPMs

which was in connection with the hydrophilicity of the relevant modified membranes.