Selective CO 2 hydrogenation enhanced by tuning the zinc content in nickel catalysts

Electron-rich Ni sites in Ni 3 Zn–Al 2 O 3 drive CO production through monodentate formate decomposition, whereas Zn-evaporation-engineered electron-deficient Ni–Al 2 O 3 promotes CH 4 formation by enabling bidentate formate hydrogenation with abundant *H.