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- Title
Role of surface composition upon the photocatalytic hydrogen production of Cr-doped and La/Cr-codoped SrTiO.
- Authors
Xu, Xiaoxiang; Lv, Meilin; Sun, Xiaoqin; Liu, Gang
- Abstract
Surface properties play a vital role in many heterogeneous catalytic reactions, particularly in photocatalytic water splitting, where photo-generated electron and holes must migrate to and be transferred at the very top surface of a photocatalyst. Here, we carried out a detailed investigation on the role of surface composition towards photocatalytic hydrogen production of perovskite-based materials, namely, Cr-doped and La/Cr-codoped SrTiO. Our findings showed that a depletion of B site cations occurred at the surface of these high-temperature annealed samples and a severe diminishing of B site cations took place after introducing La cations at the A site. Although the presence of La helps to improve surface alkalinity and inhibit the formation of detrimental Cr species, La/Cr-codoped sample showed a poor photocatalytic activity. Such a correlation between surface composition and photocatalytic activity suggests that surface tailoring or composition control is highly necessary in the design and development of these perovskite-based photocatalysts. Since surface rearrangements can be kinetically hindered at low temperatures, low temperature synthetic methods are therefore strongly preferred during the synthesis of these perovskite-based photocatalysts.
- Subjects
PHOTOCATALYSIS; STRONTIUM titanate; DOPING agents (Chemistry); HYDROGEN production; CHROMIUM; WATER electrolysis
- Publication
Journal of Materials Science, 2016, Vol 51, Issue 13, p6464
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-016-9945-0