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. Author manuscript; available in PMC: 2014 Feb 5.
Published in final edited form as: Chem Rev. 2013 Jun 14;113(8):6621–6658. doi: 10.1021/cr300463y

Figure 4.

Figure 4

Comparison of the energy efficiencies and current densities for CO2 reduction to formic acid, syngas (CO + H2), and hydrocarbons (methane and ethylene) reported in the literature with those of water electrolyzers. Efficiencies of electrolyzers are total system efficiencies, while the CO2 conversion efficiencies only include cathode losses and neglect anode and system losses.79