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a) Current density–time curves of bare ZnO, Co-Pi/ZnO, and Ni-B/ZnO photoelectrodes measured at 1.0 V (vs. RHE) for 1 h. b)–d) Typical side-on SEM images of Ni-B/ZnO, Co-Pi/ZnO and bare ZnO nanowire arrays, respectively, after 1 h of PEC measurements.
