Stand-alone photoconversion of carbon dioxide on copper oxide wire arrays powered by tungsten trioxide/dye-sensitized solar cell dual absorbers
| Autor: | Hyunwoong Park, Seung Yo Choi, Jae-Joon Lee, Hye Won Jeong, Narayan Chandra Deb Nath |
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| Rok vydání: | 2016 |
| Předmět: |
Copper oxide
Materials science Renewable Energy Sustainability and the Environment Inorganic chemistry 02 engineering and technology Overpotential 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Tungsten trioxide Cathode 0104 chemical sciences law.invention chemistry.chemical_compound Dye-sensitized solar cell chemistry law Solar cell Electrode General Materials Science Electrical and Electronic Engineering 0210 nano-technology Faraday efficiency |
| Zdroj: | Nano Energy. 25:51-59 |
| ISSN: | 2211-2855 |
| DOI: | 10.1016/j.nanoen.2016.04.025 |
| Popis: | A photoelectrochemical (PEC) cell composed of a WO 3 /dye-sensitized solar cell (WO 3 /DSSC) and copper oxide (Cu x O, where x =1 and 2) wire arrays as a dual-absorber photoanode and cathode, respectively, is demonstrated as a stand-alone, durable device for CO 2 photoconversion. The Cu x O wire arrays, which have high surface-to-volume ratios, exhibit promising electrocatalytic activity for CO 2 conversion to CO at Faradaic efficiencies of ~80% and ~60% at E=−0.2 and −0.4 V vs . RHE, respectively, and H 2 production is minimized at a Faradaic efficiency vs . RHE. The single-absorber cell of a WO 3 photoanode and Cu x O wire array cathode couple (WO 3 -Cu x O) requires a minimum overpotential of ~0.7 V to drive CO 2 conversion. For stand-alone CO 2 conversion, a DSSC is coupled to the WO 3 -Cu x O system. In the dual-absorber cell (WO 3 /DSSC-Cu x O), the long-wave band (λ > ca . 450 nm) passed through the semitransparent WO 3 film is absorbed by the dye-sensitized TiO 2 electrode of the DSSC. The WO 3 /DSSC-Cu x O shows a potential gain of ~0.7 V and is able to successfully drive CO 2 conversion on Cu x O and simultaneously oxidize water on WO 3 without an external power supply. In this stand-alone system, the primary CO 2 conversion product is CO, with a solar-to-chemical energy efficiency of ~2.5%; H 2 and formate are obtained with energy efficiencies of 0.7% and 0.25%, respectively, in 5 h (overall efficiency ~3.45%). Neither CO 2 conversion product nor H 2 is found using the single-absorber system. |
| Databáze: | OpenAIRE |
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