 This research has developed a new type of bifunctional electrocatalyst for water splitting. The electrocatalyst consists of metal sulfide clusters embedded in ultra-thin nanosheets of FAY-slash-NI metalorganic frameworks, MOF. The metal sulfides increase the reaction surface area and offer high electric conductivity, while the MOF layers provide a unique structure that can be used to control the electronic properties of the catalyst. This allows the catalyst to have high efficiency when performing both the oxygen evolution reaction, OR, and the hydrogen evolution reaction, HER, with a current density of 50 mA Cm2 producing a voltage of 1.74V. This article was authored by Ming Zhao, Wei Li, Junying Li, and others.