High‐Yield Production of Monolayer FePS₃ Quantum Sheets via Chemical Exfoliation for Efficient Photocatalytic Hydrogen Evolution

2D layered transition metal phosphorus trichalcogenides (MPX 3 ) possess higher in‐plane stiffness and lower cleavage energies than graphite. This allows them to be exfoliated down to the atomic thickness. However, a rational exfoliation route has to be sought to achieve surface‐active and uniform individual layers. Herein, monolayered FePS 3 quantum sheets (QSs) are systematically obtained, whose diameters range from 4–8 nm, through exfoliation...