TY - JOUR ID - 247479 TI - Creating Bipolar Junction by Depositing Ultrathin Anion-Exchange Coating on CationExchange Membrane to Dissociate Water in Electrodialysis JO - Journal of Membrane Science and Research JA - JMSR LA - en SN - AU - Ahmad, Muhammad AU - Hussain, Shabbir AU - Abid, Muhammad Amin AU - Mumtaz, Asad AU - Ibrar, Muhammad AU - Muhammad, Saz AD - Department of Chemistry, Division of Science and Technology, University of Education, Lahore 44770, Pakistan AD - Department of Chemistry, Khwaja Fareed University of Engineering and Information Technology, Rahim Yar Khan, Pakistan AD - Department of Chemistry, University of Sahiwal, Sahiwal, Pakistan AD - Department of Chemistry, School of Natural Sciences, National University of Sciences and Technology, Islamabad, Pakistan AD - Department of Chemistry, Lahore Garrison University, DHA Phase VI, Lahore, Pakistan AD - Department of Chemistry, Kohsar University, Murree 47150, Punjab, Pakistan Y1 - 2022 PY - 2022 VL - 8 IS - 1 SP - EP - KW - Nafion KW - Anion-exchange Coatings KW - Layer-by-Layer deposition KW - Bipolar Junction KW - Water splitting DO - 10.22079/jmsr.2021.540358.1502 N2 - Ultrathin anion-exchange films have been created by employing layer-by-layer (LBL) deposition method. The LBL  deposited protonated poly(allylamine) (PAH)/poly(4-styrenesulfonate) (PSS) polyelectrolyte multilayers (PEMs) behave as  anionexchange films when PAH and PSS polyelectrolyte solutions are prepared in NaSCN as a supporting electrolyte (SE). Reflectance FTIR studies indicate that when PAH is prepared in 0.5 M NaSCN and PSS is prepared in 1 M NaSCN, the thickness of the film and the number of anion-exchange sites in the film are manifold greater than those in the film  fabricated from PAH and PSS polyelectrolytes when either of them is prepared in 0.5 M NaSCN. Transmembrane potential measurements were performed to measure the permselectivity of thus fabricated PEMs. These measurements indicate  that the fabricated films demonstrate high anion-exchange properties at neutral pH. However, the ion-exchange  character of the films switches from anions- to cations-exchange when pH of the surrounding solutions changes from 7  to 8.4. Diffusion dialysis results through the coated alumina membranes confirm such a change in the net charge of the  films with a change in the pH. Current density-voltage curve studies indicate plenty of formation of H+ and OHions  through water dissociation occurring at the interfacial bipolar junction created by depositing these anion-exchange  coatings on Nafion cation-exchange membrane (CEM). Donnan dialysis studies also indicate the formation of bipolar  junction through deposition of such films on cationexchange membranes.  UR - https://www.msrjournal.com/article_247479.html L1 - https://www.msrjournal.com/article_247479_e44e0444b9b18f0a097eea641616b1c3.pdf ER -