Bubble detachment and long-term stability of femtosecond laser-alloyed electrocatalysts (BLaserCat)

飞秒激光合金电催化剂（BLaserCat）的气泡脱离和长期稳定性

• 批准号: 397568108
• 负责人: Dr. Thomas Gimpel
• 金额: --
• 依托单位: Forschungszentrum Energiespeichertechnologien (EST)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/397568108?language=en
• 关键词: Bubble; detachment; long; term; stability

Femtosecond laser ablation can be used to selectively adjust the properties of metal surfaces. The characteristic structures enlarge the surface and electrocatalysts can be simultaneously alloyed with several almost arbitrary active elements from the laser process environment. In order to advance this technology, the long-term stability of electrode materials in alkaline water electrolysis will be investigated in this project and their gas bubble characteristics recorded. The focus is on the generation of electrochemically stable surface alloys from the extended femtosecond laser process and the simultaneous control of the fluid dynamics in order to achieve low gas bubble-induced losses on the electrodes. The gas bubble characteristics are recorded using high-speed microscopy with a free view on the operated electrodes. The evolution and detachment of the gas bubbles are automatically recorded and evaluated. The findings also contribute to the modelling of technical systems. The electrochemical long-term measurements with operating times of about 2000 hours run in custom designed test units. Accompanying materials science and established electrochemical methods as well as periodical electrolyte tests determine the degradation of the electrode materials. The project creates the basis for evaluating the stability of femtosecond laser-alloyed catalysts. Together with the control of minimal gas bubble-induced losses, the findings have an impact on further multiphase catalyst applications that can be developed with this technology.

飞秒激光烧蚀可用于选择性地调节金属表面的性质。这种特征结构扩大了表面，电催化剂可以同时与来自激光加工环境的几个几乎任意的活性元素合金化。为了推动这一技术的发展，本项目将对碱性水电解电极材料的长期稳定性进行研究，并记录其气泡特征。重点是通过扩展的飞秒激光过程产生电化学稳定的表面合金，并同时控制流体动力学，以实现电极上低气泡引起的损失。用高速显微镜在操作电极上自由观察记录气泡特征。自动记录和评估气泡的演化和剥离。这些发现还有助于技术系统的建模。工作时间约为2000小时的电化学长期测量在定制设计的测试单元中运行。伴随着材料科学和已建立的电化学方法以及定期的电解液测试，确定电极材料的降解。该项目为评估飞秒激光合金化催化剂的稳定性奠定了基础。与控制气泡引起的最小损失一起，这些发现对可以用这项技术开发的进一步多相催化剂应用产生了影响。