KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/123456789/1

Browse

Settings

Author: search.filters.author.Amal, Rose

Search Results

Now showing 1 - 1 of 1
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Photocatalysis of heat treated sodium- and hydrogen-titanate nanoribbons for water splitting, H2/O2 generation and oxalic acid oxidation
    (2013-04-09)
    Kiatkittipong, Kunlanan
    ;
    Iwase, Akihide
    ;
    Scott, Jason
    ;
    Amal, Rose
    The photocatalytic activity of sodium titanate (Na<inf>1.48</inf>H<inf>0.52</inf>Ti<inf>3</inf>O<inf>7</inf>), sodium hexatitanate (Na<inf>2</inf>Ti<inf>6</inf>O<inf>13</inf>), and hydrogen titanate (H<inf>2</inf>Ti<inf>3</inf>O<inf>7</inf>) nanoribbons and anatase TiO<inf>2</inf> nanorods were compared for water splitting, oxalic acid photodegradation and H<inf>2</inf> and O<inf>2</inf> generation using sacrificial agents. The intrinsic properties of the materials were found to affect their performance depending on the particular reaction system. The Na<inf>2</inf>Ti<inf>6</inf>O<inf>13</inf> nanoribbons, in the presence of RuO<inf>2</inf> co-catalyst, outperformed the anatase nanorods, for the water splitting reaction, generating over 10 times more H<inf>2</inf>/O<inf>2</inf>. This was thought to derive from their tunnel-like structure which provided better electron/hole separation when compared with TiO<inf>2</inf>. However, the efficient holes and electrons scavenging in the presence of sacrificial agents, methanol or AgNO<inf>3</inf>, to generate H<inf>2</inf> or O<inf>2</inf>, respectively, overwhelmed the tunnel-like structure effect. In this case photoactivity was governed by the crystal structure, with observed decreasing activity in the order TiO<inf>2</inf>>Na<inf>2</inf>Ti<inf>6</inf>O<inf>13</inf>>H<inf>2</inf>Ti<inf>3</inf>O<inf>7</inf>~Na<inf>1.48</inf>H<inf>0.52</inf>Ti<inf>3</inf>O<inf>7</inf>, and by the band gap of the semiconductor which determined its capacity to absorb photons in producing electron/hole pairs. © 2013 Elsevier Ltd.