Parallel multi-stacked photoanodes of Sb-doped p-n homojunction hematite with near-theoretical solar conversion efficiency.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 39521777.
- Also identified by DOI 10.1038/s41467-024-53967-y and PMC identifier 11550853.
- Licence recorded as CC BY-NC-ND.
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Abstract
Developing transparent and efficient photoanodes is a challenging but essential task in tandem photoelectrochemical cell for unassisted solar water splitting without an external bias. Here we report construction of p-n homojunction hematite photoanodes by hybrid microwave annealing-induced single antimony doping, which results in the gradually-increased valence states from the surface to the inside by the unique features of hybrid microwave annealing. The Sb-doped p-n homojunction hematite photoanode exhibits improved performance and displays a good transparency, achieving a stable photocurrent density of ~4.21 mA cm<sup>-2</sup> at 1.23 V<sub>RHE</sub> under 100 mW cm<sup>-2</sup> solar irradiation, which is comparable to the reported state-of-the-art hematite photoanodes. More importantly, a parallel-connected stack of six photoanodes of transparent p-n homojunction records a near-theoretical photocurrent density of ~10 mA cm<sup>-2</sup> at 1.23 V<sub>RHE</sub> under standard photoelectrochemical water splitting conditions, which serves as a useful reference for hematite photoanodes and promises its practical application for unbiased photoelectrochemical water splitting.