Bias-free solar syngas production by integrating a molecular cobalt catalyst with perovskite-BiVO4 tandems.
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Andrei, V., Reuillard, B., & Reisner, E. (2020). Bias-free solar syngas production by integrating a molecular cobalt catalyst with perovskite-BiVO4 tandems.. Nature materials, 19 (2), 189-194. https://doi.org/10.1038/s41563-019-0501-6
The photoelectrochemical (PEC) production of syngas from water and CO2 represents an attractive technology towards a circular carbon economy. However, the overpotential (i.e. energy loss), low selectivity and cost of commonly employed catalysts make this sustainable alternative challenging. Here, we demonstrate highly tunable PEC syngas production by integrating an earth abundant, cobalt porphyrin catalyst immobilized on carbon nanotubes with triple-cation mixed halide perovskite and BiVO4 photoabsorbers. Empirical data analysis is used to clarify the optimal electrode selectivity at low catalyst loadings. The perovskite photocathodes maintain selective aqueous CO2 reduction for one day at light intensities as low as 0.1Sun. Perovskite-BiVO4 PEC tandems sustain an unprecedented bias-free syngas production for three days with solar-to-H2 and solar-to-CO conversion efficiencies of 0.06% and 0.02%, respectively, operating as standalone artificial leaves in neutral pH solution. These systems provide potential pathways for maximizing daylight utilisation, by sustaining CO2 conversion even under low solar irradiance.
Christian Doppler Research Association (Austrian Federal Ministry for Digital and Economic Affairs and the National Foundation for Research, Technology and Development), the OMV Group, Cambridge Trusts (Vice-Chancellor’s Award), the Winton Programme for the Physics of Sustainability, BBSRC
Christian Doppler Forschungsgesellschaft (unknown)
ECH2020 EUROPEAN RESEARCH COUNCIL (ERC) (682833)
External DOI: https://doi.org/10.1038/s41563-019-0501-6
This record's URL: https://www.repository.cam.ac.uk/handle/1810/297288
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