Composition Engineering–Triggered Bifunctionality of Free‐Standing Coral‐Like 1T‐MoS 2 for Highly Efficient Overall Water Splitting

Metallic‐phase 1T‐MoS 2 with its good electronic conductivity and abundant active sites attracts more attention for energy conversion and storage. However, developing a high‐performance bifunctional 1T‐MoS 2 for overall water splitting still is a challenge. Herein, a composition (Fe and Mn)‐engineering approach that is capable of triggering efficient hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) bifunctionality into coral‐like 1T‐MoS 2 nanorods for overall water splitting is reported. The results demonstrate that composition engineering induces rich crystal defects and electronic structure variation of the freestanding coral‐like 1T‐MoS 2 , leading to outstanding HER (overpotential of 34.1 mV at 10 mA cm −2 ) and OER (overpotential of 220.0 mV at 50 mA cm −2 ) activity and excellent stability in alkaline media. The facile composition‐engineering activation strategy is also feasible to endow the other transition metal dichalcogenides with dual/multiple functionality.