Okuno Kazuya, Kato Hideki, Vequizo Junie Jhon M, Yamakata Akira, Kobayashi Hisayoshi, Kobayashi Makoto, Kakihana Masato
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University 2-1-1 Katahira, Aoba-ku Sendai 980-8577 Japan
Graduate School of Engineering, Toyota Technological Institute 2-12-1 Hisakata, Tempaku-ku Nagoya 468-8511 Japan
RSC Adv. 2018 Nov 14;8(67):38140-38145. doi: 10.1039/c8ra07830k.
Doping of Cr into BiVO was examined in this study. A new absorption band with a 1.84 eV energy threshold appeared with Cr-doping. The theoretical band calculation has revealed that the new absorption is ascribed to the electron transition from the valence band to acceptor levels formed by empty Cr 3d orbitals. It was confirmed that photocatalytic water oxidation in the presence of Ag or Fe of an oxidizing reagent was induced by excitation of the new absorption although activity under band gap excitation decreased with Cr-doping. Characteristics of carrier dynamics were also investigated by transient absorption spectroscopy.
本研究考察了Cr掺杂到BiVO中的情况。Cr掺杂后出现了一个能量阈值为1.84 eV的新吸收带。理论能带计算表明，新吸收归因于电子从价带跃迁到由空的Cr 3d轨道形成的受主能级。已证实，尽管Cr掺杂会使带隙激发下的活性降低，但新吸收的激发会在氧化试剂Ag或Fe存在的情况下诱导光催化水氧化。还通过瞬态吸收光谱研究了载流子动力学特性。
