OMIECs studied here span polymers with variations in backbone chemistry (homo-and copolymers) and side chain chemistry, suggesting that the reactivity of many polymers within this class of materials may be rationalized through this EC'D mechanism when the terminal oxygen reduction product is hydro(gen) peroxide. However, we note our sample set of materials is still too narrow to make general claims for the whole range of OMIECs, and there are likely opportunities for alternative pathways that may even result in the 4-electron water product.