光催化H2进化反应从水溶液到带结构控制 (AgIn) xZn2 ((1-x) S2固溶液光催化剂的可见光反应及其表面纳米结构
Issei Tsuji1, Hideki Kato, Hisayoshi Kobayashi
1Department of Applied Chemistry, Faculty of Science, Science University of Tokyo, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan.
Journal of the American Chemical Society
|October 14, 2004
概括
新的 (AgIn) xZn(2(1-x)) S(2) 固体溶液有效地利用可见光从水中产生气. 合金催化剂进一步增强了这种光催化活性,显示了可持续生产的前景.
科学领域:
- 材料科学 材料科学 材料科学
- 光催化作用的光催化
- 可再生能源可再生能源是可再生能源.
背景情况:
- 硫化 (ZnS) 是一种宽带间隙光催化剂.
- 银二硫化物 (AgInS2) 是一种窄带间隙半导体.
- 可见光驱动的 (H2) 进化对于清洁能源至关重要.
研究的目的:
- 为了合成 (AgIn) xZn(2(1-x)) S(2) 固体溶液.
- 为了研究它们在可见光下对H2进化的光催化活性.
- 了解组合和纳米结构对光催化性能的影响.
主要方法:
- 合成 (AgIn) xZn(2(1-x)) S(2) 固体溶液.
- 在可见光下 (λ ≥420 nm) 使用牺牲试剂 (SO3(2-) 和S(2)(-)) 的光催化H2进化实验.
- 使用分散反射,光发光,SEM和TEM进行表征.
- (Pt) 催化剂的加载.
主要成果:
- 固体溶液表现出光催化H2进化活动,没有Pt共催化剂.
- Pt加载显著改善了H2演变速率.
- Pt (3%重量) 负载 (AgIn) 0.22Zn1.56S2 (带间距2.3 eV) 显示了最高的活动 (20%的显数量子产量在420nm,3.3 L m(-2) h(-1) H2进化速率).
- 由于Ag 4d和In 5s5p轨道贡献,组成变化影响了带位置.
- 观察到表面的纳米步骤结构,在步骤边缘上有选择性的Pt光沉积.
结论:
- 固体溶液 (AgIn) xZn(2(1-x)) S(2) 是有效的可见光光催化剂,用于H2进化.
- 组合调和Pt共催化剂加载提高了光催化性能.
- 表面纳米结构可能促进电荷分离,抑制电子孔重组,提高H2进化效率.
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