Synthesis of Heterogels from Metal and Metal Oxide Nanocrystals by Means of Cryogelation Method for Application in Electrocatalysis

冷冻凝胶法由金属和金属氧化物纳米晶合成杂凝胶并在电催化中的应用

• 批准号: 321088986
• 负责人: Professorin Dr. Nadja-Carola Bigall
• 金额: --
• 依托单位: Institut für Physikalische Chemie
• 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/321088986?language=en
• 关键词: Synthesis; Heterogels; Metal; Oxide; Nanocrystals

The aim of the project is to produce porous and self-supportive multicomponent gels from shape-controlled synthesized metal-, metal oxide-, and metal-metal oxide hybrid nanoparticles (NP) by means of cryogelling processes in order to investigate their application potential in electrocatalysis. In addition to the material properties of the nanoparticle building blocks such as faceting, size, shape and crystallinity, the targeted combination of materials contributes to the optimization of the electrocatalytic efficiency of the multi-component gel networks. The targeted setting of the important parameters should lead to the optimization of an effective electrocatalyst on the basis of self-supporting nanoparticle-based cryaerogel networks. Due to the high level of control over size, shape and faceting, the nano-particle building blocks required for the gel networks are produced in wet-chemical synthesis routes. The production of the porous and self-supporting multicomponent gel networks is carried out from an aqueous medium using the cryogelation process. By adding a freezing medium, e.g. liquid nitrogen, the gel network formation occurs through a sudden onset of ice crystal growth. The expelled nanocrystals collect in the space between the crystallites, so that they can interconnect to a macroscopic network. The advantage of the cryogelation method that it works independently from surface chemistry, size, shape and facetation of the nanocrystals, here will be exploited to synthesize various multicomponent gel networks incl. gel network-coated electrodes. The different material compositions of the cryo-aerogel-coated electrodes are characterized electrochemically in order to compare the performance capabilities of the structural elements used. Eventually, the application potential of the multicomponent gel networks in the field of electrocatalysis in an aqueous environment is to be tested. The results are interrelated and the important parameters for optimizing the electrocatalysts will be identified and understood.

该项目的目的是通过冷冻工艺从形状可控的合成的金属、金属氧化物和金属-金属氧化物杂化纳米颗粒(NP)中制备多孔和自持的多组分凝胶，以探索它们在电催化中的应用潜力。除了纳米粒子构建块的材料属性(如刻面、尺寸、形状和结晶度)外，材料的靶向组合有助于优化多组分凝胶网络的电催化效率。对重要参数的有针对性的设置应该导致在自持的纳米颗粒基低温气凝胶网络的基础上优化有效的电催化剂。由于对尺寸、形状和刻面的高度控制，凝胶网络所需的纳米颗粒构建块是通过湿法化学合成路线生产的。使用冷凝法从水介质中生产多孔和自持的多组分凝胶网络。通过加入冷冻介质，例如液氮，凝胶网络的形成通过冰晶的突然开始生长而发生。排出的纳米晶体聚集在微晶之间的空间，因此它们可以相互连接到宏观网络。冷冻凝胶法的优点是它独立于纳米晶体的表面化学、尺寸、形状和刻面，在这里将被用来合成各种多组分的凝胶网络，包括。凝胶网络涂覆电极。对不同材料组成的低温气凝胶涂层电极进行了电化学表征，以比较所用结构元件的性能。最终，多组分凝胶网络在水环境中的电催化领域的应用潜力将得到检验。这些结果是相互关联的，优化电催化剂的重要参数将被识别和理解。