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Solar fuel production approaches. (a) Suspension-based photocatalysis. (b) Photoanode|dark cathode. (c) Photocathode|dark anode. (d) Photoanode|Photocathode. Note: For CO2 reduction, the same design is applied with the exception of CO2 reduction rather than proton reduction on the cathodes. The bias in Figure 1d could be omitted if two photoelectrodes can form a Z-scheme.
