Hybrid PhotoElectrodes for Selective Reduction of CO2 into Solar Fuels

用于选择性将二氧化碳还原为太阳能燃料的混合光电极

• 批准号: 501734070
• 负责人: Professor Dr. Nicolas Plumeré
• 金额: --
• 依托单位: Institut für 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/501734070?language=en
• 关键词: Hybrid; PhotoElectrodes; Selective; Reduction; CO2

Solar driven chemistry for CO2 reduction to C1 compounds is the most direct route to sustainable production of chemicals and fuels. However, the application of molecular catalysts for solar to chemical energy conversion has not yet reached maturity even though we have access to molecular catalysts for efficient reduction of CO2 and high performance photoelectrodes for light-driven delivery of the required high energy electrons. If exploited appropriately, the combination of such molecular catalysts and photoelectrodes could offer sustainable solutions for carbon utilization and fossil-free energy generation. However, two major bottlenecks impair the applications of hybrid photoelectrodes: 1. Photocurrents are often far below those expected based on the intrinsic properties of the catalyst and of the photoelectrode because the interfacing with the semiconductor component affects the catalysts properties or is limited by slow interfacial charge transfer. 2. Selectivity in CO2-conversion is often affected by the local environment of the catalyst (local pH values, gradients in CO2 concentration, permittivity of the surrounding medium, potential gradients). The project HYPHE-C1 will address both bottlenecks: Our overarching goal is to concomitantly maximize the catalytic rates and the product selectivity, by integrating the catalyst on a photoelectrode by means of electron conducting matrices to ultimately achieve highly efficient light driven CO2 reduction to CO, formaldehyde and methanol, thus controlling the reduction process from 2 to 6 electrons.

将CO2还原为C1化合物的太阳能驱动化学是化学品和燃料可持续生产的最直接途径。然而，用于太阳能到化学能转换的分子催化剂的应用尚未达到成熟，即使我们已经获得用于有效还原CO2的分子催化剂和用于所需高能电子的光驱动递送的高性能光电极。如果利用得当，这种分子催化剂和光电极的组合可以为碳利用和无化石能源生产提供可持续的解决方案。然而，两个主要的瓶颈阻碍了混合光电极的应用：1。光电流通常远低于基于催化剂和光电极的固有性质所预期的光电流，因为与半导体组件的界面作用影响催化剂性质或受到缓慢的界面电荷转移的限制。2. CO2转化的选择性通常受催化剂的局部环境（局部pH值、CO2浓度梯度、周围介质的介电常数、电势梯度）的影响。HYPHE-C1项目将解决这两个瓶颈：我们的总体目标是同时最大限度地提高催化速率和产品选择性，通过电子传导矩阵将催化剂集成在光电极上，最终实现高效的光驱动CO2还原为CO，甲醛和甲醇，从而将还原过程控制在2到6个电子。