We have confirmed that high performance in PEC water oxidation can be achieved by the ptype Cu2O photoanode through charge carrier-selective engineering. However, the requirement for alkaline conditions and the slightly high onset potential may pose challenges for developing practical photoconversion devices. To address these issues, we evaluated the PEC efficiency of p-type Cu2O photoanodes under neutral pH conditions and explored their PEC activity in sulfite oxidation, which typically demonstrates faster kinetics than for water oxidation.