亚大气压对TiO气泡演变的影响
Xinyi Luo1, Qiang Xu1, Tengfei Nie1
1State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, No. 28, Xianning West Road, Xi'an, Shaanxi, 710049, P. R. China. qiang.xu@mail.xjtu.edu.cn.
Physical chemistry chemical physics : PCCP
|June 6, 2023
概括
在光电化学水分裂中降低压力会减少光电流,但会增加泡大小. 度 马兰戈尼力,而不是热力,在较低的压力下驱动泡离开.
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
- 化学工程是化学工程的重要组成部分.
背景情况:
- 泡核和光电极表面的生长阻碍了光电化学水分裂效率.
- 了解气泡动力学对于优化水分裂性能至关重要.
研究的目的:
- 为了研究TiO2光电极上的氧气泡行为.
- 为了将气泡的几何参数与不同压力和激光功率下的光电流波动相关联.
- 分析控制泡离开的力量.
主要方法:
- 使用电化学工作站和高速显微镜进行现场观测.
- 压力和激光功率的系统变化.
- 构建一个力平衡模型,用于气泡脱离.
主要成果:
- 随着压力下降,光电流下降,气泡离开直径增加.
- 气泡核和生长阶段在较低的压力下缩短.
- 度 马兰戈尼力在亚大气压力下的气泡离开时成为主导.
结论:
- 在亚大气条件下,马兰戈尼力是气泡离散直径的主要驱动力.
- 优化光电极性能需要管理泡动力学和力量.
- 气体大规模生产速度达到80kPa附近的峰值.
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