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梯度自 CuBi₂O₄,具有高度提高的电荷分离效率

Fuxian Wang¹, Wilman Septina², Abdelkrim Chemseddine¹

¹Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Institute for Solar Fuels , Hahn-Meitner-Platz 1, 14109 Berlin, Germany.

Journal of the American Chemical Society

|October 3, 2017

概括

在铜 bismuth 氧化物 (CuBi2O4) 光阴极中进行前向梯度自吸增强电荷分离效率. 这种新的方法改善了光电化学性能,用于没有外部剂的还原反应和演变.

科学领域:

材料科学
电化学
光催化

背景情况:

提高电荷分离效率对于提高金属氧化物电极的光电化学性能至关重要.
铜氧化物 (CuBi2O4) 是光阴极的有希望的材料,但其效率通常受到电荷重组的限制.

研究的目的:

提出和研究前向梯度自我补充的新战略,以提高CuBi2O4光阴管的电荷分离效率.
了解铜空位梯度对CuBi2O4内部电场和电荷动态的影响.

主要方法:

在铜空隙中使用两步的扩散辅助喷雾热解工艺制备 CuBi2O4 光阴极,控制前向和反向梯度.
光阴极特性,包括载体度,费米水平和平带电位变化.
用光电化学测量来评估电荷分离效率和降解反应和演变的性能.

主要成果:

与同类产品相比,向前梯度自我补充显著提高了电荷分离效率和光电化学性能.
具有向前梯度的CuBi2O4光阴极在550 nm时达到2.5 mA/cm2 (AM 1.5) 的记录光电流密度和34%的电荷分离效率.
带有CdS/TiO2异质连接和Pt催化剂的受保护光阴管在0.0V与RHE时表现出1.0mA/cm2的光电密度,以及演变的~91%的法拉达效率.

结论:

前向梯度自我补充是一种有效的策略,可以在CuBi2O4中产生内部电场,促进电荷分离并提高光电化学性能.
这种方法提高了效率,而不损害材料的晶体结构或载体移动性,为先进的光阴极设计提供了有前途的途径.
开发的渐变自化CuBi2O4光阴极具有高效太阳能转化和生产的潜力.

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