Synthesis of Single Phase Sn3O4: Native Visible-Light-Sensitive Photocatalyst with High Photocatalytic Performance for Hydrogen Evolution
Synthesis of Single Phase Sn3O4: Native Visible-Light-Sensitive Photocatalyst with High Photocatalytic Performance for Hydrogen Evolution
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DOI：
10.1166/jnn.2017.13060
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发表时间：
2017-05-01
影响因子：
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通讯作者：
Matsumoto, Futoshi
中科院分区：
文献类型：
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作者：
Tanabe, Toyokazu;Hashimoto, Masanari;Matsumoto, Futoshi
通过优化水热反应条件，合成了可见光催化剂Sn 3 O 4。在最佳工艺条件下（C6 H5 O 7）（3）-/Sn 2 + = 2.5，pH= 5.5，加热时间为6 h，过滤，NaOH洗涤，得到了单一相的Sn 3 O 4。在可见光（λ> 420 nm）照射下，在牺牲剂存在下，单相Sn 3 O 4在水溶液中具有显著的催化析氢活性，即使没有Pt助催化剂也是如此。Pt助催化剂是Sn_3O_4材料表现出较高光催化活性的关键。表观量子产率为0.2%的单相Sn_3O_4和1.5%的Pt负载的Sn_3O_4，可见光敏感的掺杂金属氧化物和（氧）氮化物光催化剂的竞争力。由紫外-可见吸收光谱和价带XPS谱估算了Sn_3O_4的带边位置。单相Sn_3 O_4的析氢增强归因于在可见光下总水裂解所需的带隙和带边位置，这源于Sn_4 ~（4+）与Sn_2 ~（2+）在Sn_3 O_4中的共存。
A visible light sensitive photocatalyst, Sn3O4, was synthesized by optimizing hydrothermal reaction conditions. The single phase of Sn3O4 was obtained by the optimal condition ((C6H5O7)(3)-/Sn2+ = 2.5, pH= 5.5, heating time= 6 h, filtration and NaOH washing). The single phase Sn3O4 significantly catalyzed hydrogen evolution in aqueous solution in the presence of sacrifice agent under irradiation of visible light (lambda > 420 nm), even without Pt co-catalyst. Pt co- catalyst was critical for Sn3O4 material to exhibit higher photocatalytic activity, so far in this study. The apparent quantum yield was 0.2% for single phase Sn3O4 and 1.5% for Pt loaded-Sn3O4, competitive to that of visible-lightsensitive doped metal oxide and (oxy) nitrides photocatalyst. The band edge positions of Sn3O4 were estimated from the UV-Vis absorption spectra and the valence band XPS spectra. The enhanced hydrogen evolution of the single phase Sn3O4 is attributed to the desirable band gap and band edge position for overall water splitting in visible light, which originate from co- existence of Sn4+ with Sn2+ in Sn3O4.