期刊
CATALYSTS
卷 11, 期 5, 页码 -出版社
MDPI
DOI: 10.3390/catal11050626
关键词
water oxidation; co-cytochrome c; semiartificial photosynthesis; antimony-doped tin oxide (ATO); photoelectrochemistry
资金
- NSF [1508301]
- Spanish Ministerio de Economia y Competitividad (MINECO) [FPU14/02550]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1508301] Funding Source: National Science Foundation
The immobilization of Co-protoporphyrin IX (Co-PPIX) substituted cytochrome c (Co-cyt c) on Antimony-doped Tin Oxide (ATO) as a catalyst for photoelectrochemical oxidation of water was reported. The ATO-Co-cyt c photoanode exhibited significantly enhanced photocurrent density and good stability, demonstrating its potential for light-induced water oxidation.
Here, we report the immobilization of Co-protoporphyrin IX (Co-PPIX) substituted cytochrome c (Co-cyt c) on Antimony-doped Tin Oxide (ATO) as a catalyst for photoelectrochemical oxidation of water. Under visible light irradiation (lambda > 450 nm), the ATO-Co-cyt c photoanode displays similar to 6-fold enhancement in photocurrent density relative to ATO-Co-PPIX at 0.25 V vs. RHE at pH 5.0. The light-induced water oxidation activity of the system was demonstrated by detecting evolved stoichiometric oxygen by gas chromatography, and incident photon to current efficiency was measured as 4.1% at 450 nm. The faradaic efficiency for the generated oxygen was 97%, with a 671 turnover number (TON) for oxygen. The current density had a slow decay over the course of 6 h of constant irradiation and applied potential, which exhibits the robustness of catalyst-ATO interaction.
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