在超声波振动增强气生成过程中,温度对气泡生长的影响
Hongqian Su1, Jindong Sun1, Caizhu Wang1
1School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China; Building Environment and Energy Power Engineering Experimental Center, Beijing University of Civil Engineering and Architecture, Beijing 100044, China.
Ultrasonics sonochemistry
|December 21, 2023
概括
超声波振动和更高的温度改善了质子交换膜 (PEM) 阴极中的泡脱离. 这通过减少催化剂表面上的泡覆盖来提高生产效率.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 质子交换膜 (PEM) 阴极面临着气泡沉在催化层上的挑战,阻碍了性能.
- 有效的气泡分离对于优化PEM电解器中气演变反应至关重要.
研究的目的:
- 研究超声波振动和温度对泡产生,演化和脱落机制的联合影响.
- 为了提高PEM阴极中的沉性能和整体生产效率.
主要方法:
- 在合超声波和电场下利用了纳米和微气泡的能量和机械分析.
- 研究了气泡核化频率,压力-温度关系和脱离半径.
- 进行视觉实验,以验证超声波和温度对生产的影响.
主要成果:
- 操作温度显著影响气泡核形成,生长和脱离.
- 温度升高降低了激活能量和表面张力,提高了核化频率,减少了泡脱离半径.
- 超声波通过声波化和冲击效应促进气泡脱离,增加核化部位和生产效率.
结论:
- 结合超声波处理和升高的温度有效地提高了气泡脱离和PEM阴极性能.
- 优化条件 (例如60°C电解质) 显示最大 (7.34%) 和平均 (5.83%) 生产效率显著增加.
- 超声波强化加快了泡脱离,减少了电极覆盖,降低了电压损失,并提高了整体生产效率.
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