An Alkaline-Stable,\nMetal Hydroxide Mimicking Metal–Organic\nFramework for Efficient Electrocatalytic Oxygen Evolution

Abstract

Postsynthetic ion exchange of [Co₂(μ-Cl)₂(btta)] (MAF-X27-Cl, H₂bbta =1<i>H</i>,5<i>H</i>-benzo­(1,2-<i>d</i>:4,5-<i>d</i>′)­bistriazole)\npossessing open metal sites on its pore surface yields a material\n[Co₂(μ-OH)₂(bbta)] (MAF-X27-OH) functionalized\nby both open metal sites and hydroxide ligands, giving drastically\nimproved electrocatalytic activities for the oxygen evolution reaction\n(an overpotential of 292 mV at 10.0 mA cm^–2 in 1.0\nM KOH solution). Isotope tracing experiments further confirm that\nthe hydroxide ligands are involved in the OER process to provide a\nlow-energy intraframework coupling pathway.