Electroreduction of CO 2 into valuable chemicals provides a promising strategy for mitigating excessive CO 2 emissions and storing intermittent renewable energy. Herein, SnO 2 /CuOnanoparticle composites (NCs) with rich heterointerfaces were designed for selectively converting CO 2 into liquidus formate. Distinct from only monometallic phase evolved in physicallymixed samples, Cu and Sn atoms at the heterointerfaces were in-situ reduced into alloys under working conditions. With residual SnO x /CuO x stabilizing the CO 2 * À intermediate, CuSn alloys can obviously suppress the undesired hydrogen evolution reaction and then enhance the catalytic selectivity. In a H-type cell, as-obtained SnO 2 /CuO NCs exhibit Faraday efficiency (FE) of 89.3 % and current density of 18.34 mA cm À 2 for formate, which is stable for 30 h at À 1.0 V vs. RHE. Impressively, the formate current density of 310 mA cm À 2 is achieved in a flow cell. Moreover, constructing efficient samples by the heterointerfaces engineering would provide an inspiration for designing novel electrocatalysts.
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