在WO3光电极中引入氧气空隙,通过NaH2PO2处理以实现高效的水分离
Qiuyang Huang1, Yicheng Zhao1, Yongdan Li2
1School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China.
Langmuir : the ACS journal of surfaces and colloids
|October 29, 2024
概括
通过NaH2PO2处理将氧空缺 (OV) 引入氧氧氧化物 (WO3) 光电极,通过增强电荷分离和减少重组,显著提高光电化学水分裂效率.
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 (WO3) 是光电化学 (PEC) 水分裂的有前途的光电极材料,由于其高光吸收和合适的带结构.
- 然而,其应用受到光诱导的电子孔分离和随后的再组合差异的限制.
研究的目的:
- 为了提高PEC水分的WO3光电极的效率.
- 通过在WO3表面引入氧空位 (OV) 来抑制电子孔重组.
主要方法:
- 使用低酸盐 (NaH) 处理对WO3光电极表面进行修改.
- 形成一个富含氧气空缺 (OV) 的无形表面层 (约. 厚度为4纳米).
- 电荷载体密度,电化学表面积和电荷转移属性的表征.
主要成果:
- NaH2PO2处理成功地引入了氧气空缺,形成了一个无形的表面层.
- 经过修改的WO3光电极表现出更高的电荷载体密度和更大的电化学表面积.
- 观察到电荷分离和表面注入效率的显著改善.
- 加快了电荷传输过程,从而提高了PEC性能.
结论:
- 通过NaH2PO2处理引入氧气空缺是一种有效的策略,以减轻WO3光电极中的电子孔重组.
- 增强的电荷动态和表面特性有助于提高光电化学水分裂性能.
- 经过修改的WO3光电极在1.23V时实现了0.96mA cm-2的电流密度,证明了其有效分水的潜力.
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