DOI: https://doi.org/10.29363/nanoge.ecat.2023.016
Publication date: 10th October 2023
Electrocatalytic carbon dioxide reduction provides a way to generate useful fuels and feedstocks from a waste stream. Historically there has been a strong focus on the use of metal electrodes for carbon dioxide reduction, often Au, Ag and Cu. These have achieved impressive selectivity’s and current densities but they tend to work only when the local pH is high. This gives rise to an issue – it is well understood that the reaction of carbon dioxide with hydroxide lowers the available carbon dioxide for conversion and can cause substantial purification costs. Molecular electrocatalysts based on transition metal catalysts may in principle be tuned to control selectivity by modification of the ligand structure. This gives the possibility of developing catalysts that can operate in challenging environments, such as at low pH, conditions where conventional metal electrodes produce mainly hydrogen. Here I will describe the ongoing efforts by our group to study and utilise molecular electrocatalysts for carbon dioxide reduction. We will discuss both fundamental studies and also work on gas diffusion electrodes in complete electrolysers. We will focus in particular on the application within bipolar membrane electrolysers and explore the challenges in taking the approach forward to real-world application.
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