 The study presents a highly efficient bifunctional electrocatalyst for overall water splitting using unique metal sulfide clusters embedded in ultra-thin nanoshheets of phase-slash-NI metal organic framework, MOF, grown on nickel foam. The catalyst exhibits remarkable stability and activity towards both the oxygen-evolution reaction, OR, and hydrogen-evolution reaction, HER, in alkaline media, and bifunctionally catalyzes overall alkaline water splitting at a current density of 50 mA Cm-2 by 1.74 V cell voltage without IR compensation. The enhancement mechanism is attributed to the impregnated metal sulfide clusters in the nanoshheets, which promote the formation of ultra-thin nanoshheets to enlarge the reaction surface area and modulate the electronic structure of catalytically active atom sites to an electron-rich state via strong electronic interaction. This work highlights the rational design and synthesis of uniquely structured MOF-derived catalysts for efficient water splitting. This article was authored by Ming Zhao, Weili, Jinning Lee, and others. We are article.tv. Links in the description below.