Efficient visible-light-driven photocatalytic H2 production over Cr/N-codoped SrTiO3
Efficient visible-light-driven photocatalytic H2 production over Cr/N-codoped SrTiO3
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DOI：
10.1016/j.ijhydene.2012.05.097
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发表时间：
2012-09
影响因子：
7.2
通讯作者：
He Yu;S. Yan;Zhaosheng Li;Tao Yu;Z. Zou
中科院分区：
文献类型：
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作者：
He Yu;S. Yan;Zhaosheng Li;Tao Yu;Z. Zou
采用溶胶凝胶水热法制备了可见光响应的铬氮共掺钛酸锶。对比研究表明，用这种方法可以制备出掺铬和铬/氮共掺的钛酸锶，但不能合成氮掺杂的钛酸锶。理论计算表明，Cr/N共掺杂的钛酸锶的缺陷形成能比氮掺杂的小得多，说明铬的掺入可以促进氮掺杂到钛酸锶中的氧位。与掺铬的钛酸锶相比，铬/氮共掺的钛酸锶催化剂具有较高的光催化活性，在420 nm处的量子效率为3.1%，这是因为它具有更小的带隙和更少的空位缺陷。
Visible-light-response Cr/N-codoped SrTiO3was prepared by a sol–gel hydrothermal method. The comparison studies indicate that Cr-doped and Cr/N-codoped SrTiO3can be synthesized by this means, but not the N-doped SrTiO3. The theoretical calculations exhibit the defect formation energy of the Cr/N codoping into SrTiO3is much smaller than that of the N doping into SrTiO3, illuminating that the incorporation of Cr can promote the N doping into the O sites in the SrTiO3. Compared to the Cr-doped SrTiO3, the Cr/N-codoped SrTiO3photocatalyst shows the high photocatalytic activities for hydrogen production with the quantum efficiency of 3.1% at 420 nm, due to the smaller band gap and much less vacancy defects.