Suppressing hydrogen evolution by aqueous silicon powder dispersions through the introduction of an additional cathodic reaction

Show simple item record

dc.contributor.author Fabbro, O.D.
dc.contributor.author Muller, E.
dc.contributor.upauthor Tichapondwa, Shepherd Masimba
dc.contributor.upauthor Focke, Walter Wilhelm
dc.contributor.upauthor Sandenbergh, R.F.
dc.date.accessioned 2014-02-04T13:32:12Z
dc.date.issued 2014
dc.description.abstract Silicon powder reacts with water, liberating hydrogen gas, which poses an explosion risk. Adding metal ions with a high reduction potential suppresses hydrogen generation. Copper (II) ions are particularly effective in this regard. In their presence the reaction features three distinct stages. In the initial phase copper is deposited on the silicon surface concomitant with a rapid drop in the solution pH. Most of the hydrogen evolves during a second active stage with the pH showing a slight upward drift. Finally, in the third stage, the silicon surface passivates and hydrogen evolution comes to a halt. A comparison of this method and two other methods previously reported, i.e., controlled air oxidation of the silicon powder before slurrying and adding organic corrosion inhibitors, shows that silane surface modification of silicon is the most effective method in terms of decreasing the greatest amount of hydrogen released and increasing silicon reactivity in a typical pyrotechnic composition. en_US
dc.description.librarian hb2014 en_US
dc.description.sponsorship The THRIP programme of the Department of Trade and Industry and the National Research Foundation as well as AEL Mining Services en_US
dc.description.uri http://www.tandfonline.com/loi/gcec20 en_US
dc.identifier.citation S. M. Tichapondwa , W. W. Focke , O. Del Fabbro , R. W. Sandenbergh & E. Muller (2014) Suppressing hydrogen evolution by aqueous silicon powder dispersions through the introduction of an additional cathodic reaction, Chemical Engineering Communications, 201:4, 501-515, DOI: 10.1080/00986445.2013.777902 en_US
dc.identifier.issn 0098-6445 (print)
dc.identifier.issn 1563-5201 (online)
dc.identifier.other 10.1080/00986445.2013.777902
dc.identifier.uri http://hdl.handle.net/2263/33286
dc.language.iso en en_US
dc.publisher Taylor & Francis en_US
dc.rights © Taylor & Francis Group, LLC. This is an electronic version of an article published in Chemical Engineering Communications, vol. 201, no. 4, pp. 501-515, 2014. doi : 10.1080/00986445.2013.777902 en_US
dc.subject Copper en_US
dc.subject Hydrogen en_US
dc.subject Pyrotechnics en_US
dc.subject Silicon en_US
dc.title Suppressing hydrogen evolution by aqueous silicon powder dispersions through the introduction of an additional cathodic reaction en_US
dc.type Postprint Article en_US


Files in this item

This item appears in the following Collection(s)

Show simple item record