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SUMMARY:High crystallinity nitrogen doping of ALaTiO4 and A2La2Ti3O10 (A =
  Na¬+\, K+) photocatalysts
DTSTART;VALUE=DATE-TIME:20211125T075900Z
DTEND;VALUE=DATE-TIME:20211125T080000Z
DTSTAMP;VALUE=DATE-TIME:20260718T051811Z
UID:indico-contribution-4384@events01.synchrotron.org.au
DESCRIPTION:Speakers: Junwei Junwei Li (The University of Sydney)\nGlobal 
 warming is a current hot topic due to its potential for irreversible envir
 onmental damage. Ambitions were made within the Paris agreement to limit t
 he temperature rise to be below 1.5 ºC pre-industrial level. Therefore\, 
 alternative fuel sources are needed to replace fossil fuel\, with hydrogen
  gas is one popular choice due to its high energy density per unit weight\
 , and technologies utilising hydrogen already developed. Hydrogen can be g
 enerated renewably by sunlight driven\, photocatalytic water-splitting. Me
 tal oxides\, including those with a Ruddlesden-Popper type structures are 
 being studied as potential photocatalysts. KLaTiO4 is a n=1 Ruddlesden-Pop
 per type layered perovskite. KLaTiO4 can be used as a Hydrogen Evolution C
 atalyst (HEC)\, producing 9.540 μmol of H2 gas per hour from 20 mg of cat
 alyst\, when using methanol as sacrificial electron donor and platinum co-
 catalyst. The main issue of KLaTiO4 is its high bandgap (4.09 eV) meant it
  is incapable of absorbing visible light.\nThe two main factors important 
 for the synthesis of ALaTiO4 and A2La2Ti3O10 (A = Na¬+\, K+) was discusse
 d: volatility of alkaline metal ions at elevated temperatures and sinterin
 g temperature. Multiple samples of NaLaTiO4 or Na2La2Ti3O10 were made usin
 g traditional solid-state synthesis methods at temperature between 750 °C
  to 950 °C. Bandgap was tuned by doping nitrogen into the structure of AL
 aTiO4 during the synthesis process\, as opposed to replacing oxygen atoms 
 with nitrogen by post treatment of ALaTiO4. This was achieved by replacing
  a portion of TiO2 reagent used for TiN\, and the sample was synthesised a
 s normal. The resultant ALaTiO4-xNx¬ sample retained good crystallinity a
 nd have reduced bandgap\, but at a cost of reduction in hydrogen evolution
  rate.\n\nhttps://events01.synchrotron.org.au/event/146/contributions/4384
 /
LOCATION:Online
URL:https://events01.synchrotron.org.au/event/146/contributions/4384/
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