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Finite element simulation (in COMSOL Multiphysics) of the concentration profiles of oxidized species in operating Si microwire photoelectrodes (A) in the control configuration and (B) in the device configuration, where Δ0 denotes the hydrodynamic boundary layer thickness. (C) Simulation of the electric potential profiles of the wire-array photoelectrodes in the stand-alone, two-electrode configuration (Scheme 1C).
