New 3d-transition metal-based materials for efficient anodic electrocatalysis

可用作困难的氧析出的替代物以促进在阴极处电化学产生氢的阳极反应是例如醇或氨的氧化。 对于这些反应，必须开发新的电催化剂。该项目在研究小组UNODE（电化学能量转换中的不寻常阳极反应：氢气生产中的价值创造而不是氧气释放）内，研究了两类3d过渡金属化合物在碱性电解质中的催化潜力。一方面采用共沉淀法制备二元碳酸氢盐混合盐，其组成多种多样;另一方面，尖晶石氧化物也通过煅烧羟基碳酸盐或作为所谓的高熵化合物而以可变组成制备。通过全面的固态化学表征和电化学测试方面的活性，选择性和稳定性，组成以及结构和这些催化性能之间的相关性将被研究。通过迭代优化，将在研究小组关于反应机制的合作框架内开发和研究新的高效电催化剂。

Anodic reactions that can be used as an alternative to the difficult oxygen evolution to facilitate the electrochemical generation of hydrogen at the cathode are, for example, the oxidation of alcohols or of ammonia. For these reactions, new electrocatalysts have to be developed. This project, within the research group UNODE (UNusual anODE reactions in electrochemical energy conversion: Value creation rather than oxygen evolution in hydrogen production), investigates two classes of 3d transition metal compounds with respect to their catalytic potential in alkaline electrolytes. On the one hand, binary hydoxycarbonate mixed salts are prepared by co-precipitation and their composition is varied. On the other hand, spinel oxides are also produced with variable composition either by calcination of the hydroxy carbonates or as so-called high entropy compounds. Through comprehensive solid-state chemical characterization and electrochemical testing with respect to activity, selectivity and stability, correlations between composition as well as structure and these catalytic properties will be studied. Through iterative optimization, new and highly effective electrocatalysts will thus be developed and investigated within the framework of the collaboration in the research group regarding reaction mechanisms.