Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 8, Issue 12, Pages 3597-3604Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ee01445j
Keywords
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Funding
- Brain Korea Plus Program of Ministry of Education, Korean Centre for Artificial Photosynthesis - MISIP [NRF-2011-C1AAA0001-2011-0030278]
- MOTIE of Republic of Korea [10050509]
- Ulsan National Institute of Science and Technology (UNIST)
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A gold-coupled ZnTe/ZnO-nanowire array is a new photocathode for selective CO2 reduction to CO. At -0.7 V-RHE under simulated 1 sun illumination, its photocurrent (-16.0 mA cm(-2)) and incident photon-to-current conversion efficiency (97%) represent the highest among reported ZnTe photocathodes for CO2 reduction and dramatic enhancement from those of a bare electrode (-7.9 mA cm(-2), 68%). In addition, the Au nanoparticles convert mainly-hydrogen-producing bare ZnTe/ZnO-nanowires into mainly-CO-producing photocathodes in photoelectrochemical CO2 reduction. The remarkable effects of the Au co-catalyst originate from the formation of a Schottky junction with ZnTe to improve charge separation and to provide reaction centers for CO2 reduction suppressing competing water reduction.
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