High-quality phosphorus-doped MoS2 ultrathin nanosheets with amenable ORR catalytic activity.

Engineering phosphorus heteroatoms into the plane of ultrathin MoS2 nanosheets is realized via a facile thermolytical process. The doping of low-electronegative P atoms generates an extra ORR activity with four-electron selectivity, manifesting seven-fold current increase as well as 160 mV positive shift in both onset and half-wave potentials.