Abstract:
:Photoelectrochemical (PEC) water splitting promises a solution to the problem of large-scale solar energy storage. However, its development has been impeded by the poor performance of photoanodes, particularly in their capability for photovoltage generation. Many examples employing photovoltaic modules to correct the deficiency for unassisted solar water splitting have been reported to-date. Here we show that, by using the prototypical photoanode material of haematite as a study tool, structural disorders on or near the surfaces are important causes of the low photovoltages. We develop a facile re-growth strategy to reduce surface disorders and as a consequence, a turn-on voltage of 0.45 V (versus reversible hydrogen electrode) is achieved. This result permits us to construct a photoelectrochemical device with a haematite photoanode and Si photocathode to split water at an overall efficiency of 0.91%, with NiFeOx and TiO2/Pt overlayers, respectively.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Jang JW,Du C,Ye Y,Lin Y,Yao X,Thorne J,Liu E,McMahon G,Zhu J,Javey A,Guo J,Wang Ddoi
10.1038/ncomms8447subject
Has Abstractpub_date
2015-06-16 00:00:00pages
7447issn
2041-1723pii
ncomms8447journal_volume
6pub_type
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