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Amorphous FeOOH Oxygen Evolution Reaction Catalyst for Photoelectrochemical Water Splitting

Chemelewski, William D., Lee, Heung-Chan, Lin, Jung-Fu, Bard, Allen J., Mullins, C. Buddie·2014·Journal of the American Chemical Society
DOI 10.1021/ja411835a
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Abstract

Reaching the goal of economical photoelectrochemical (PEC) water splitting will likely require the combination of efficient solar absorbers with high activity electrocatalysts for the hydrogen and oxygen evolution reactions (HER and OER). Toward this goal, we synthesized an amorphous FeOOH (a-FeOOH) phase that has not previously been studied as an OER catalyst. The a-FeOOH films show activity comparable to that of another OER cocatalyst, Co-borate (Co-Bi), in 1 M Na2CO3, reaching 10 mA/cm(2) at an overpotential of ∼550 mV for 10 nm thick films. Additionally, the a-FeOOH thin films absorb less than 3% of the solar photons (AM1.5G) with energy greater than 1.9 eV, are homogeneous over large areas, and act as a protective layer separating the solution from the solar absorber. The utility of a-FeOOH in a realistic system is tested by depositing on amorphous Si triple junction solar cells with a photovoltaic efficiency of 6.8%. The resulting a-FeOOH/a-Si devices achieve a total water splitting efficiency of 4.3% at 0 V vs RHE in a three-electrode configuration and show no decrease in efficiency over the course of 4 h.

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Cited by

Metadata

Authors
Chemelewski, W. D., Lee, H.-C., Lin, J.-F., Bard, A. J., & Mullins, C. B.
Venue
Journal of the American Chemical Society
Publisher
American Chemical Society (ACS)
Published
2014-02-05
Volume
136
Issue
7
Pages
2843-2850
ISSN
  • 0002-7863 (ISSN-L)
  • 1520-5126
DOI
10.1021/ja411835a
OpenAlex
W2107790223
Cited by
603
References
5
FWCI
20.19
Type
journal article
Language
en
Open access
closed

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