Journal
NATURE COMMUNICATIONS
Volume 6, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms8447
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Funding
- National Science Foundation (DMR) [1055762, 1317280]
- Office of Science, Office of Basic Energy Sciences, of U.S. Department of Energy [DE-AC02-05CH11231]
- National Basic Research Program of China [2013CB834605]
- National Natural Science Foundation of China [U1232102]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1055762] Funding Source: National Science Foundation
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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 0.45V (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.
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