Molten salt assisted construction of (311)/(111) facet heterojunctions in NiCo2O4 for efficient photoelectrocatalytic methanol oxidation.

DFT-guided molten-salt-assisted synthesis enables the construction of (311)/(111) facet heterojunctions in NiCo2O4. The surface-energy disparity drives charge separation, while the (311) facet enhances CH3OH/OH- adsorption and CO tolerance, synergistically boosting methanol oxidation and establishing facet heterojunction engineering as a paradigm for spinel oxide photocatalysts.