Effect of high-pressure ammonia treatment on the activity of Ge3N4 photocatalyst for overall water splitting.
Effect of high-pressure ammonia treatment on the activity of Ge3N4 photocatalyst for overall water splitting.
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DOI：
10.1021/jp063068v
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发表时间：
2006-08
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影响因子：
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通讯作者：
Yungi Lee;Tomoaki Watanabe;T. Takata;M. Hara;M. Yoshimura;K. Domen
中科院分区：
文献类型：
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作者：
Yungi Lee;Tomoaki Watanabe;T. Takata;M. Hara;M. Yoshimura;K. Domen
在823 K、20 MPa或更高的氨压下，对β-Ge（3）N（4）粉末进行氨处理5-24 h，可有效提高其光催化分解水的活性。处理后样品的表面和体相氮含量随处理温度和处理时间的变化而变化，这与β-Ge（3）N（4）粉末在加压氨中的稳定性有关。氮含量的变化导致整体水分解的光催化活性的变化。在823 K、20 MPa氨气氛下处理5 h的β-Ge（3）N（4）粉末的光催化活性是合成粉末的4倍，这归因于体相和表面阴离子缺陷密度的降低。
The photocatalytic activity of beta-Ge(3)N(4) powder for overall water splitting is successfully enhanced by ammonia treatment at 823 K for 5-24 h at ammonia pressures of 20 MPa or greater. The surface and bulk nitrogen content in the treated samples varies according to the treatment temperature and treatment time, related to the stability of beta-Ge(3)N(4) powder under pressurized ammonia. The change in nitrogen content resulted in a change in the photocatalytic activity for overall water splitting. A beta-Ge(3)N(4) powder treated at 823 K for 5 h under ammonia at 20 MPa exhibited a photocatalytic activity 4 times higher than that of the as-synthesized powder, attributable to a decrease in the density of anion defects in the bulk and surface.