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The electroreduction of CO2 (CO2RR) is a sustainable approach to mitigate the raised global CO2 emissions and further produce valuable chemicals. Electrocatalysts are crucial to lower the energy barrier, tune the intricate reaction pathways and suppress competitive side-reaction. In this feature article, we give a brief overview of our journey in the design of efficient catalysts for CO2RR. From bulk metal to nanoparticles to single-atom catalysts (SACs), we summarize our progress in the design of efficient metal nanoparticles by porosity engineering, defect engineering and alloy engineering, and developing single-atom catalysts with advanced metal sites, coordination environments, substrates and synthesis routes. We highlight the importance of reaction environment and provide an ionic liquids nanoconfinement strategy for local environment modification. In the end, we provide our views and perspectives for the future direction of CO2RR towards commercialization.
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