Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 134, Issue 30, Pages 12406-12409Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja3051734
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Funding
- NSF [DMR 1055762]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1055762] Funding Source: National Science Foundation
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Hematite (alpha-Fe2O3) was grown on vertically aligned Si nanowires (NWs) using atomic layer deposition to form a dual-absorber system. Si NWs absorb photons that are transparent to hematite (600 nm < lambda < 1100 nm) and convert the energy into additional photovoltage to assist photoelectrochemical (PEC) water splitting by hematite. Compared with hematite-only photoelectrodes, those with Si NWs exhibited a photocurrent turn-on potential as low as 0.6 V vs RHE. This result represents one of the lowest turn-on potentials observed for hematite-based PEC water splitting systems. It addresses a critical challenge of using hematite for PEC water splitting, namely, the fact that the band-edge positions are too positive for high-efficiency water splitting.
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