碩士 / 國立成功大學 / 化學工程學系碩博士班 / 100 / Bipolar membranes are widely used in industry. They were usually used to produce the acid/base solutions and water treatment. Therefore, bipolar membranes have been attracted industrial and academic research. Reducing the cell voltage of water electrolysis by using bipolar membrane had proved by our laboratory. Consequently, the aim of this research is to investigate the surface modification of PVDF membranes by plasma treatment and alter various ionic monomers to form four kinds of bipolar membranes for hydrogen production from water electrolysis.
In this study, the N,N-Dimethyl amino ethyl acrylate (DMAEA)、4-Vinyl pyridine (4-VP), 4-Styrene sulfonic acid sodium salt hydrate (SSS)、acrylic acid (AA) monomers were grafted onto the respective side of the PVDF membranes through the plasma treatment. Four kinds of bipolar membranes, DMAEA-PVDF-SSS、DMAEA-PVDF-AA、4VP-PVDF-SSS and 4VP-PVDF-AA bipolar membranes, have been successfully prepared by plasma-induced polymerization method after characteristic of FTIR and SEM. Poly-ethersulfonate (PES) membranes were used as background experiment (Water). In water electrolysis experiment, the cell voltage using four kinds of bipolar membranes is lower than PES membrane (Water). Among those bipolar membranes, DMAEA-PVDF-SSS bipolar membrane has lowest critical voltage of water splitting to H+ and OH- as 0.92V. On the other hand, the limiting current density was increased with the increasing of KCl concentration. Furthermore, H2 production efficiency can be improved 10-30% (compared with Water). When using the DMAEA-PVDF-SSS bipolar membranes in water electrolysis, the H2 production efficiency can be as high as 92% but it is just only 74% by 4VP-PVDF-SSS bipolar membranes. The result is attributed from the electrical field, water dissociation constant ratio and their physical properties. In the energy consumption of H2 production, DMAEA-PVDF-SSS bipolar membranes have great outcome, it can save 48% energy. Consequently, the effect of anion exchange layer on the water electrolysis is larger than that of cation exchange layer of bipolar membranes.
| Identifer | oai:union.ndltd.org:TW/100NCKU5063134 |
| Date | January 2012 |
| Creators | JouLi, 李柔 |
| Contributors | Jui-Che Lin, 林睿哲 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 106 |
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