Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
Microheterogeneous solid polymer electrolyte (SPE) membranes for electrocatalysis
Dissertation (Ph.D.)--Stellenbosch University, 2002.
Saved in:
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Thesis |
| Language: | en_ZA |
| Published: |
Stellenbosch : Stellenbosch University
2012
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867614140529377280 |
|---|---|
| access_status_str | Open Access |
| author | Michaels, W. C. |
| author2 | Bessarabov, D. G. |
| author_browse | Bessarabov, D. G. Michaels, W. C. |
| author_facet | Bessarabov, D. G. Michaels, W. C. |
| author_sort | Michaels, W. C. |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Dissertation (Ph.D.)--Stellenbosch University, 2002. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/52934 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA |
| last_indexed | 2026-06-10T12:47:18.472Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2012 |
| publishDateRange | 2012 |
| publishDateSort | 2012 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/52934 Microheterogeneous solid polymer electrolyte (SPE) membranes for electrocatalysis Michaels, W. C. Bessarabov, D. G. Sanderson, R. D. Stellenbosch University. Faculty of Science. Dept. of Chemistry and Polymer Sciences. Polymers Membranes (Technology) Spectrophotometry Filters and filtration Dissertations -- Polymer science Dissertation (Ph.D.)--Stellenbosch University, 2002. ENGLISH ABSTRACT: The deposition of platinum catalyst on cation-exchange membranes was achieved by a counter diffusion deposition method known as the Takenaka- Torikai method. The morphology of the platinum catalyst on the membranes were controlled by varying the conditions of the platinum deposition process, such as, temperature, type of reducing agent and concentration of the platinic acid solution. The effect of the sonication of platinic acid solution and the pre-treatment of membranes on the morphology of a platinum catalyst was also investigated. Platinum loading on cation-exchange membranes was determined by UV spectrophotometric and gravimetric analyses. Suitable conditions for the quantitative determination of the platinum loading on membranes by UV spectrophotometric analysis was established through the development of a protocol. Membranes were characterised using different techniques such as, Atomic Force Microscopy (AFM), Scanning Electron Microscopy (SEM), Infrared spectrometry (IR), Dielectric analysis (DEA) and Brunauer Emmett Teller adsorption (BET). The roughness profile of a platinum catalyst embedded on a membrane was explored by various statistical methods. The statistical analysis of various data sets for a surface of a platinum-containing membrane was investigated using the Hurst exponent. The effect of surface modification of membranes on the deposition process, as well as the morphology of the platinum catalyst, was investigated. Membranes were modified with ethylene diamine (EDA) and cetyltrimethylammonium bromide surfactant. Modification of membranes with cetyltrimethylammonium bromide surfactant resulted in a unique textured platinum catalyst. The electrochemical "switching" phenomenon was investigated for EDAmodified membranes and EDA-modified membranes embedded with platinum catalyst. The "switching" phenomenon was observed in i-V cyclic curves, which were obtained by galvanodynamie measurements. The application of electro catalytic membrane systems in the anodic oxidation of water was investigated by electrochemical techniques such as galvanostatic and cyclic voltammetric measurements. AFRIKAANSE OPSOMMING: Die deponering van 'n platinum katalis op katioon-uitruil membrane is suksesvol gedoen d.m.v. die Takenaka-Torikai metode. Die morfologie van die platinum katalis op die membrane is gekontrolleer deur variasie van die kondisies van die platinum deponeringsproses, bv. temperatuur, tipe reduseermiddel gebruik en konsentrasie van die platiensuuroplossing, asook die ultrasonifikasie van die platiensuuroplossing en voorafbehandeling van die membrane. UV spektrofotometriese asook gravimetriese analitiese metodes is gebruik om die platinumlading op katioon-uitruil membrane te bepaal. Geskikte kondisies vir die kwantitatiewe bepaling van die platinumlading op membrane d.m.v. UV spektrofotometriese analise is ontwikkel deur die skep van 'n protokol. Membrane is gekarakteriseer d.m.v. die volgende tegnieke: Atoomkrag Mikroskopie, Skanderingselektron Mikroskopie, Infrarooi Spektrometrie, di-elektriese analise en Brunauer Emmett Teller adsorpsie. Die skurtheidsprofiel van 'n platinum katalis op 'n membraan is ondersoek deur gebruik te maak van verskeie statistiese metodes. Statistiese analises van verskeie data stelsels van 'n platinum-bevattende membraan is ondersoek deur gebruik te maak van die Hurst eksponent. \ Die effek van oppervlakmodifikasie op membrane sowel as die deponeringsproses en morfologie van die platinum katalis is ondersoek deur die modifikasie van membrane met etileen diamien (EDA) en setieltrimetielammonium bromied as versepingsmiddel Die elektrochemiese omswaai van EDA-gemodifiseerde membrane sowel as gemodifiseerde platinum bevattende membrane is ondersoek d.m.v. galvanodinamiese metings. Die gebruik van elektro-katalitiese membraansisteme in die anodiese oksidasie van water is ondersoek deur gebruik te maak van elektrochemiese tegnieke, bv. galvanostatiese en sikliese voltammetriese metings. Doctoral 2012-08-27T11:35:13Z 2012-08-27T11:35:13Z 2002-04 Thesis http://hdl.handle.net/10019.1/52934 en_ZA Stellenbosch University 301 p. : ill. application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Polymers Membranes (Technology) Spectrophotometry Filters and filtration Dissertations -- Polymer science Michaels, W. C. Microheterogeneous solid polymer electrolyte (SPE) membranes for electrocatalysis |
| title | Microheterogeneous solid polymer electrolyte (SPE) membranes for electrocatalysis |
| title_full | Microheterogeneous solid polymer electrolyte (SPE) membranes for electrocatalysis |
| title_fullStr | Microheterogeneous solid polymer electrolyte (SPE) membranes for electrocatalysis |
| title_full_unstemmed | Microheterogeneous solid polymer electrolyte (SPE) membranes for electrocatalysis |
| title_short | Microheterogeneous solid polymer electrolyte (SPE) membranes for electrocatalysis |
| title_sort | microheterogeneous solid polymer electrolyte spe membranes for electrocatalysis |
| topic | Polymers Membranes (Technology) Spectrophotometry Filters and filtration Dissertations -- Polymer science |
| url | http://hdl.handle.net/10019.1/52934 |
| work_keys_str_mv | AT michaelswc microheterogeneoussolidpolymerelectrolytespemembranesforelectrocatalysis |