Unknown

Dataset Information

0

Activating the surface and bulk of hematite photoanodes to improve solar water splitting.


ABSTRACT: A simple electrochemical activation treatment is proposed to improve effectively the photoelectrochemical performance of Nb,Sn co-doped hematite nanorods. The activation process involves an initial thrice cathodic scanning (reduction) and a subsequent thrice anodic scanning (oxidation), which modifies both the surface and bulk properties of the Nb,Sn:Fe2O3 photoanode. First, it selectively removes the surface components to different extents endowing the hematite surface with fewer defects and richer Nb-O and Sn-O bonds and thus passivates the surface trap states. The surface passivation effect also enhances the photoelectrochemical stability of the photoanode. Finally, more Fe2+ ions or oxygen vacancies are generated in the bulk of hematite to enhance its conductivity. As a result, the photocurrent density is increased by 62.3% from 1.88 to 3.05 mA cm-2 at 1.23 VRHE, the photocurrent onset potential shifts cathodically by ?70 mV, and photoelectrochemical stability improves remarkably relative to the pristine photoanode under simulated sunlight (100 mW cm-2).

SUBMITTER: Zhang H 

PROVIDER: S-EPMC6988740 | BioStudies | 2019-01-01

REPOSITORIES: biostudies

Similar Datasets

2013-01-01 | S-EPMC3775410 | BioStudies
2017-01-01 | S-EPMC6641740 | BioStudies
2020-01-01 | S-EPMC7307839 | BioStudies
2019-01-01 | S-EPMC6506520 | BioStudies
2020-01-01 | S-EPMC7493915 | BioStudies
2020-01-01 | S-EPMC7016909 | BioStudies
1000-01-01 | S-EPMC5310524 | BioStudies
2020-01-01 | S-EPMC7060458 | BioStudies
2019-01-01 | S-EPMC6973097 | BioStudies
1000-01-01 | S-EPMC5811107 | BioStudies