Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.273
Publication date: 18th July 2023
The conversion of renewable energy into valuable chemicals and fuels requires water and CO2 electrolysis. To make these technologies more accessible and affordable worldwide, we need to find catalysts that are cheap, abundant, active, and stable. The catalysts’ performance depends not only on their intrinsic properties but also on the electrolyzer’s design and the type of electrolyte used. However, in CO2 electrolysis, the catalyst may exhibit rapid degradation in a certain electrolyte because of the pH change over time due to ion movement across the membrane.1 Therefore, the anode materials should resist corrosion in a wide range of pH values and/or in electrolytes rich in carbonate. Most of the non-noble transition metals and their compounds are very stable at high pH, but they are less durable than Ir or Pt at low and (near-) neutral pH.2 Interestingly, some recent studies have shown that oxides based on Co can maintain good stability even at low pH.3, 4 However, we still do not understand how this stability works and how non-noble metal oxides catalyze the oxygen evolution reaction (OER) at low or near-neutral pH. In this work, we tried to answer some of the questions. We use a scanning flow cell (SFC) combined with inductively coupled plasma mass spectrometry (ICP-MS) and differential electrochemical mass spectrometry (DEMS) to study the stability of cobalt oxide under different electrochemical conditions at low and mild pH. With these techniques, we can monitor the dissolution of Co online and identify possible narrow stability windows before and during the OER. Moreover, going one step further toward the industrial application of such materials, we tested various Co3O4-based electrodes as anodes in CO2 electrolyzers. Based on our results, we suggest and discuss the dissolution of cobalt oxide and provide perspectives on improving its stability.
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