Enlightening the journey of metal-organic framework (derived) catalysts during the oxygen evolution reaction in alkaline media via operando X-ray absorption spectroscopy
Abstract: The development of catalysts with an enhanced activity for the oxygen evolution reaction (OER) compared to the traditionally used metal oxide catalysts is crucial for further commercialization of electrolyzers. Due to their high surface area and adjustable pore structure, metal organic framework (MOF) based catalysts represent a promising alternative. During OER in alkaline media, the MOF structure can transform dramatically and act as a precursor through decomposition of the organic backbone and/or metal oxide, hydroxide and oxyhydroxide formation, respectively. Hence, operando characterizations of MOF catalysts during OER are crucial to understand the material’s progressive changes and extract the OER catalytic mechanism. This article discusses existing operando X-ray absorption spectroscopy (XAS) studies of MOF(-derived) catalysts during OER and extracts important parameters for future research regarding operando XAS characterizations of MOFs in alkaline electrolysis.
Keywords: electrolysis / water splitting / XAS / operando
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