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The electroreduction of CO2 into the highly value-added fuel formic acid (HCOOH) has been considered an ideal approach to convert renewable energy and mitigate environmental crisis. SnO2 electrode is one of the promising candidates to electrocatalytically convert CO2 to HCOOH, but its poor stability limits its future development and application. In this study, highly stable SnO2 /Bi2 O3 oxide catalysts are obtained by distributing SnO2 nanoparticles on the surface of Bi2 O3 sheets. The XPS spectra revealed an interfacial electronic trans