A Copper phosphide (CuP) micro-rod (MR) array, with coverage by an n-CuO thin layer by electrodeposition as a photocathode, has been directly fabricated on copper foil via simple electro-oxidation and phosphidation for photoelectrochemical (PEC) hydrogen production. The morphology, structure, and composition of the CuP/CuO heterostructure are systematically analyzed using a scanning electron microscope (SEM), X-ray diffraction and X-ray photoelectron spectra. The PEC measurements corroborate that the p-CuP/n-CuO heterostructural photocathode illustrates efficient charge separation and low charge transfer resistance to achieve the highest photocurrent of 430 μA cm that is greater than other transition metal phosphide materials. In addition, a detailed energy diagram of the p-CuP/n-CuO heterostructure was investigated using Mott-Schottky analysis. Our study paves the way to explore phosphide-based materials in a new class for solar energy applications.
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| http://dx.doi.org/10.1016/j.jcis.2018.03.103 | DOI Listing |
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