Cathodic shift in onset potential of solar oxygen evolution on hematite by 13-group oxide overlayers

The onset potential of photoelectrochemical water oxidation on ultrathin hematite was improved by up to 200 mV by the chemical bath deposition of 13-group oxides as overlayers. It is proposed that the corundum-type overlayers released lattice strain of the ultrathin hematite layer and decreased the density of surface states. Particularly, a Ga2O3 overlayer exhibited an enhanced photocurrent attributed to stoichiometric water splitting near the onset potential. The photocurrent was sustained over a day, attesting to its outstanding performance and durability for water splitting.


Published in:
Energy & Environmental Science, 4, 2512-2515
Year:
2011
Keywords:
Laboratories:




 Record created 2012-01-13, last modified 2018-03-17


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