3 years ago

Optimization of photoelectrochemical performance in Pt modified p-Cu2O/n-Cu2O nanocomposite.

Yichen Wang, Zhizhen Ye, Wenzhe Niu, Zirui Lou, Liping Zhu
As expected to be one of the most promising materials for utilizing solar energy, Cu<sub>2</sub>O has attracted extensive attention toward solar energy conversion. Until now, the photocurrent densities of all planar structure of the Cu<sub>2</sub>O photocathode are still not even close to the theoretical value of -14.7 mA cm<sup>-2</sup> due to the incompatible light absorption and charge carrier diffusion lengths. Here, we have fabricated p-n Cu<sub>2</sub>O homojunction nanocomposite by multiple steps of electrochemical deposition (ECD) processing with the optimization of deposition periods. The p-Cu<sub>2</sub>O/n-Cu<sub>2</sub>O nanocomposite fabricated by optimized pH (4.9) and deposition time (4 min) exhibited 2 times higher photocurrent density than that of the bare p-Cu<sub>2</sub>O photocathode. And the highest photocurrent density of nanostructured p-n Cu<sub>2</sub>O NR homojunction photocathode with a p-Cu<sub>2</sub>O blocking layer reached up to -10.0 mA cm<sup>-2</sup> at 0 V vs. RHE under simulated AM 1.5G illumination (100 mW cm<sup>-2</sup>).

Publisher URL: http://doi.org/10.1088/1361-6528/aaac01

DOI: 10.1088/1361-6528/aaac01

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