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Role of GaN NWs. J−V curves (A) and Faradaic efficiency and productivity (B) of CuFe/Si and CuFe@GaN NWs/Si. Spatial decoupling of CO2RR from light absorption and charge carriers separation over CuFe@GaN NWs/Si (C). Experimental conditions: CO2-purged 0.5 M KHCO3 aqueous solution (pH ≈ 8), one-sun illumination (AM 1.5G, 100 mW⋅cm−2).
