Enabling unassisted solar water splitting by iron oxide and silicon.

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 Commun

journal_title

Nature communications

authors

Jang JW,Du C,Ye Y,Lin Y,Yao X,Thorne J,Liu E,McMahon G,Zhu J,Javey A,Guo J,Wang D

doi

10.1038/ncomms8447

subject

Has Abstract

pub_date

2015-06-16 00:00:00

pages

7447

issn

2041-1723

pii

ncomms8447

journal_volume

6

pub_type

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