LAUSR

Porphyrins are archetypal ligands in inorganic chemistry. The last 10 years have seen important new advances in the use of metalloporphyrins as catalysts in the activation and reduction of small molecules, in particular O 2 and CO 2 . Recent developments of new molecular designs, scaling relationships, theoretical modeling of mechanisms has rapidly advanced the utility of porphyrins as electrocatalysts. In this mini-review, we focus on the summary and evaluation of recent developments of metalloporphyrin O 2 and CO 2 reduction electrocatalysts, with an emphasis on contrasting homogeneous and heterogeneous electrocatalysis. We provide comparisons for proposed reaction mechanisms for both CO 2 and O 2 reduction and advance ideas about how lessons from the last decade of research can lead to the development of practical, applied porphyrin-derived catalysts.