Influence of dynamic operation conditions on the electrolytic hydrogen evolution

动态操作条件对电解析氢的影响

• 批准号: 406662882
• 负责人: Professor Dr. Timo Jacob
• 金额: --
• 依托单位: Physikalisch-Chemisches Institut
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/406662882?language=en
• 关键词: Influence; dynamic; operation; conditions; electrolytic

Hydrogen plays a key-role for the conversion and storage of renewable energy. As energy carrier it can either be converted in low-temperature fuel cells to electricity or chemically converted into higher-valued organic molecules. In principle, hydrogen can be obtained by electrolytic water splitting, where one of the main problems is related to the continuous and homogeneous supply of electricity by photovoltaic or wind parks. Therefore, in order to realize a hydrogen economy based on renewable energy, the development of water electrocatalyst that operate efficient, stable and economically under rather fluctuating operation conditions is indispensable. This requires an electrolytic water splitting under acidic conditions, with the flexibility of operation at higher overpotentials without losing long-term stability in particular of the anode materials. Within this joint project of Prof. Jacob (Ulm) and Prof. Over (Gießen) we will investigate the increased corrosion and the activity of Ir-based single-crystalline model oxide-electrodes during acidic oxygen evolution on the microscopic scale, with particular focus on resolving the influence of strongly varying operation conditions. In order to achieve this ambitious goal a tight connection between ab initio theory and experiment will provide a microkinetic description of the occurring electrochemical processes, which will be validated against corresponding operando measurements, with particular emphasis on stability and activity of the electrocatalysts.

氢气在可再生能源的转化和储存中起着关键作用。作为能量载体，它可以在低温燃料电池中转化为电能，也可以化学转化为更高价值的有机分子。原则上，氢气可以通过电解水分解获得，其中一个主要问题与光伏或风电场的连续均匀供电有关。因此，为了实现基于可再生能源的氢经济，开发在波动较大的操作条件下高效、稳定和经济地操作的水电催化剂是必不可少的。这需要在酸性条件下进行电解水分解，并具有在较高过电位下操作的灵活性，而不会失去长期稳定性，特别是阳极材料的长期稳定性。在Jacob教授（乌尔姆）和Over教授（Gießen）的这个联合项目中，我们将研究在微观尺度上酸性氧析出过程中Ir基单晶模型氧化物电极的腐蚀增加和活性，特别关注解决强烈变化的操作条件的影响。为了实现这一雄心勃勃的目标，从头算理论和实验之间的紧密联系将提供发生的电化学过程的微观动力学描述，这将对相应的操作测量进行验证，特别强调电催化剂的稳定性和活性。