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. 2016 Feb 3;2(2):80–88. doi: 10.1021/acscentsci.5b00402

Figure 4.

Figure 4

Photoelectrochemical performance of the Ta:TiO2/BiVO4 nanowire heterostructures. (a, b) Absorption and IPCE for Ta:TiO2|BiVO4 samples with increasing loading. Near complete absorption and optimal activity are observed for planar equivalent thickness of 40 nm of Bi. (c) IPCE for Ta:TiO2 and Ta:TiO2|BiVO4 showing visible contribution from BiVO4. (d) Current–voltage curves in 0.5 M potassium phosphate electrolyte buffered to pH 7 with and without the presence of a hole scavenger. (e) Current–voltage curves in 0.5 M potassium phosphate electrolyte buffered to pH 7 for Ta:TiO2 and Ta:TiO2|BiVO4.