用于氧化水的热稳定N2间接的WO3光电极
1Beckman Institute, Division of Chemistry and Chemical Engineering, California Institute of Technology, M/C 127-72, 1200 East California Boulevard, Pasadena, California 91125, USA.
Journal of the American Chemical Society
|October 2, 2012
概括
研究人员制造了 (N(2)) 间的氧化 (WO(3) 化合物. 这些新型材料作为高效的光电极起作用,吸收可见光,用于潜在的太阳能应用.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 光催化作用的光催化
背景情况:
- 氧化 (WO(3)) 是具有宽带间隙的半导体,限制了其在可见光驱动应用中的使用.
- 开发吸收可见光的材料对于推进太阳能转换技术至关重要.
研究的目的:
- 在氧化物 (WO(3) 中合成和表征稳定的 (N(2) 间化化合物.
- 调查N(2) 介质对WO(3) 的光学和电化学性质的影响.
- 评估这些材料作为可见光驱动氧气进化的光电极的潜力.
主要方法:
- 化学合成的xN(2) ·WO(3) 间化合物.
- 光谱分析 (例如,UV-Vis) 来确定光学吸收特性.
- 电化学测量,包括氧气演变的光电流和法拉达效率.
- 计算建模以了解主机-客户互动.
主要成果:
- 成功地形成了稳定的间化合物xN(2) ·WO(3) (x = 0.034-0.039).
- 间显著降低了WO(3) 的吸收值,使可见光吸收.
- 在波长≤640nm的照明下,0.039N(2) ·WO(3) 阳极呈现光电流.
- 在1.0M HClO ((4) ((aq) 中,对于O ((2) 演化实现了接近单位的法拉达效率.
- 光谱和计算数据显示了晶格变形和弱电子相互作用,有助于红移吸收.
结论:
- 间是一种有效的策略,可以增强WO的可见光反应.
- 合成的xN(2) ·WO(3) 材料有望成为可见光驱动水分的高效光电极.
- 预计贵重气体间接的WO(3) 材料是可行的可见光响应光电极.
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