Unbiased Sunlight-Driven Artificial Photosynthesis of Carbon Monoxide from CO2 Using a ZnTe-Based Photocathode and a Perovskite Solar Cell in Tandem

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Solar fuel production, mimicking natural photosynthesis of converting CO2 into useful fuels and storing solar energy as chemical energy, has received great attention in recent years. Practical large-scale fuel production needs a unique device capable of CO2 reduction using only solar energy and water as an electron source. Here we report such a system composed of a gold-decorated triple-layered ZnO@ZnTe@CdTe core-shell nanorod array photocathode and a CH3NH3PbI3 perovskite solar cell in tandem. The assembly allows effective light harvesting of higher energy photons (>2.14 eV) from the front-side photocathode and lower energy photons (>1.5 eV) from the back-side-positioned perovskite solar cell in a single-photon excitation. This system represents an example of a photocathode-photovoltaic tandem device operating under sunlight without external bias for selective CO2 conversion. It exhibited a steady solar-to-CO conversion efficiency over 0.35% and a solar-to-fuel conversion efficiency exceeding 0.43% including H-2 as a minor product.
Publisher
AMER CHEMICAL SOC
Issue Date
2016-07
Language
English
Article Type
Article
Keywords

CONVERSION EFFICIENCY; HYDROGEN-PRODUCTION; ENERGY-CONVERSION; REDUCTION; WATER; SYSTEM; FUELS; PHOTOVOLTAICS; EVOLUTION; NANOWIRE

Citation

ACS NANO, v.10, no.7, pp.6980 - 6987

ISSN
1936-0851
DOI
10.1021/acsnano.6b02965
URI
http://hdl.handle.net/10203/245011
Appears in Collection
CBE-Journal Papers(저널논문)
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