Preparation and Characterization of CMC-PVA/PVA-SA-MePc (COOH)8/CS-PVA Bipolar Membrane Using Electrospinning Technique

Ting Jin Zhou; Min Lu; Ri Yao Chen

doi:10.4028/www.scientific.net/AMR.774-776.795

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Preparation and Characterization of CMC-PVA/PVA-SA-MePc (COOH)₈/CS-PVA Bipolar Membrane Using Electrospinning Technique

Abstract:

Carboxymethyl cellulose (CMC)-polyvinyl alcohol (PVA) and chitosan (CS)-polyvinyl alcohol were cross-linked by Fe³⁺ and glutaraldehyde respectively to prepare cation exchange layer and anion exchange layer, and polyvinyl alcohol-sodium alginate (SA)-metal octocarboxyphthalocyanine (MePc (COOH)₈, a kind of water splitting catalyst, here, Me stands for Fe³⁺ or Co²⁺) nanofibers were prepared by electrospinning technique and introduced into the interlayer to obtain the CMC-PVA/PVA-SA-MePc (COOH)₈/CS-PVA bipolar membrane (BPM). The experimental results showed that compared with the BPM without the PVA-SA-MePc (COOH)₈ interlayer, the water splitting efficiency at the interlayer of the CMC-PVA/PVA-SA-MePc (COOH)₈/ CS-PVA BPM was obviously increased, and its membrane impedance decreased. When the concentration of FePc (COOH)₈ in the PVA-SA-FePc (COOH)₈ nanofibers was 3.0%, the trans-membrane voltage drop (IR drop) of the CMC-PVA/PVA-SA-FePc (COOH)8/CS-PVA BPM was as low as 0.6V at a high current density of 90 mA/cm².