Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
The fabrication of porous nanocomposites is key to the advancement of energy conversion and storage devices that interface with electrolytes. Bismuth vanadate, BiVO4, is a promising oxide for solar water splitting where the controlled fabrication of BiVO4 layers within porous, conducting scaffolds has remained challenging. While there have been numerous demonstrations of non-conformal BiVO4 placement within conductive hosts, there remains a need for better BiVO4 fabrication techniques. Here, the atomic layer deposition of bismuth vanadates are reported from commercial reagents. The resulting films have tunable stoichiometry and may be crystallized to form the photoactive scheelite structure of BiVO4. A selective etch process was used with vanadium-rich depositions to enable phase-pure BiVO4 after spinodal decomposition. BiVO4 thin films were measured for photoelectrochemical performance under AM 1.5 illumination and demonstrated efficient charge separation with a hole-scavenging sulfite electrolyte. The capability to deposit conformal BiVO4 will enable a new generation of nanocomposite architectures for solar water splitting.
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