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We report the fabrication of the WO3 nanoneedles/α-Fe2O3 heterojunction photoanodes for efficient photoelectrochemical water splitting. The high-aspect-ratio single crystalline WO3 nanoneedles (NNs) act as both the photoanode framework and the light harvester in the UV and blue visible region. The porous layer of small α-Fe2O3 nanocrystals act as a cooperative light harvester in the visible region...
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