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(A and D) Si nanowires (NWs) with a MoS2 catalyst, reproduced with permission from Hu et al. (81). (B and E) Performance of multilayered, heterojunction Cu2O photocathodes, reproduced with permission from Luo et al. (97). (C and F) Long-term stability of a GaN|Pt photocathode, adapted with permission from Vanka et al. (76).
