Nat. Rev. Mater. doi:10.1038/natrevmats.2016.9 Figure 4 Nanostructure effects on the selectivity of Cu catalysts for CO2 electroreduction Panel a is adapted with permission from Reske, R., Mistry, H., Beha­farid, F., Roldan Cuenya, B. & Strasser, P. Particle size effects in the catalytic electroreduction of CO2 on Cu nanoparticles. J. Am. Chem. Soc. 136, 6978–6986 (2014), American Chemical Society Panel b is adapted with permission from Manthiram, K., Beberwy­ck, B. J. & Alivisatos, A. P. Enhanced electrochemical methanation of carbon dioxide with a dispersible nanoscale copper catalyst. J. Am. Chem. Soc. 136, 13319–13325 (2014), American Chemical Society Panel c is adapted with permission from Baturina, O. A. et al. CO2 Electroreduction to hydrocarbons on carbon-supported Cu nanoparticles. ACS Catal. 4, 3682–3695 (2014), American Chemical Society Panel d is adapted with permission from Chen, C. S. et al. Stable and selective electrochemical reduction of carbon dioxide to ethylene on copper mesocrystals. Catal. Sci. Tech. 5, 161–168 (2015), Royal Society of Chemistry Strasser, P. & Cuenya, B. R. et al. (2016) Nanostructured electrocatalysts with tunable activity and selectivity Nat. Rev. Mater. doi:10.1038/natrevmats.2016.9