Porous Gold Nanoumbrellas with Adjustable Apical Angles for Selective Electrosynthesis of Styrene Epoxide from Styrene

. Detailed mechanism studies reveal that active Br radicals as the key intermediate are formed around metal pores and further enriched within the confined umbrella-like cavity, which thus facilitate subsequent bromination and further cyclization reactions for robust styrene epoxide electrosynthesis. This work provides a physical engineering route to enhance chemical selectivity for efficient electrosynthesis of renewable chemicals and feedstocks.