LAUSR

Herein, methane (CH4) production in carbon dioxide (CO2) hydrogenation by hydrogen (H2) is enhanced by reducing surface carbon deposits on molybdenum carbide (Mo2C) hollow spheres. When surface carbon deposits present on Mo2C hollow spheres, CO2 conversion is 9.9%, and CO and CH4 are both produced from CO2 hydrogenation, with CO and CH4 selectivity of 58.4% and 41.6%, respectively. When surface carbon deposits absent on Mo2C hollow spheres, CO2 conversion increases to 18.6%, and CO2 hydrogenation to CH4 is enhanced, with a 100% CH4 selectivity. Reducing surface carbon deposits on Mo2C hollow spheres changes the CO2 adsorbed on Mo2C hollow spheres from a monodentate structure to a bidentate structure which prefers to undergo hydrogenation to CH4, thus enhancing CH4 formation from CO2 hydrogenation. These results open a new way to fabricate more efficient noble‐metal‐free catalysts for selective CO2 hydrogenation.