Abstract
Artificial carbon fixation contributes to closing the anthropogenic carbon cycle. However, large-scale conversion of CO2 into selective products remains a challenge. Coupled thermal–electrochemical catalysis could offer an attractive approach to upgrading CO2 into value-added products if selective electrocatalysts and integrated devices were developed. Here we identify a mechanistic route to selectively producing either CO or CH4 with high selectivity (>95%) using Ir–ceria-based catalysts in an intermediate-temperature (400 °C) CO2 electrolyser that operates at low overpotential and ambient pressure. We show that tuning of the Ir–O hybridization by controlling the Ir speciation can alter the catalyst surface chemical environment, enabling the stabilization of specific transition states for the production of either CO or CH4 during electrocatalysis. By achieving CO2 electrohydrogenation in tandem with light-alkane electrodehydrogenation, we further demonstrate that such an advanced electrolyser could be extended to the upgrade of different carbon resources in one-step, significantly enhancing the techno-economic feasibilty of the process.
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Data availability
Source data are provided with this paper. Any additional data are available upon request from the corresponding author. Additional methods and results are provided in the Supplementary Information.
Change history
30 April 2021
A Correction to this paper has been published: https://doi.org/10.1038/s41929-021-00623-z
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Acknowledgements
This work was supported by the Idaho National Laboratory Laboratory Directed Research & Development Program under the Department of Energy Idaho Operations Office Contract DE-AC07-051D14517. This research made use of Idaho National Laboratory computing resources which are supported by the Office of Nuclear Energy of the U.S. Department of Energy and the Nuclear Science User Facilities under Contract No. DE-AC07-05ID14517. Sandia National Laboratories is a multimission laboratory managed and operated by National Technology & Engineering Solutions of Sandia, LLC, a wholly owned subsidiary of Honeywell International Inc., for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA0003525.This paper describes objective technical results and analysis. Any subjective views or opinions that might be expressed in the paper do not necessarily represent the views of the U.S. Department of Energy or the United States Government.
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Contributions
D.D. conceived, designed and supervised the project. M.L. performed the ab initio calculations and proposed the catalyst design concept. M.L. and B.H. developed the catalysts, integrated the electrolysers, performed the characterizations, conducted electrochemical tests and analysed the data. L.-C.W. helped with the GC–MS, H2-TPR and DRIFTS tests. W.W. helped with the cell fabrication. Y.D. and J.D.S. performed the scanning transmission electron microscopy imaging, STEM–EDX and STEM–EELS. J.L. helped with the theoretical calculations and the interpretation. M.L. and B.H. wrote the manuscript and all authors contributed to the revision.
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Peer review information Nature Catalysis thanks Michal Bajdich and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.
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Supplementary information
Supplementary Information
Supplementary Methods, Tables 1–9, Figs. 1–47 and Note 1.
Supplementary Data 1
Atomic coordinates of the most stable Irn clusters (n = 5, 6, 11, 15).
Supplementary Data 2
Atomic coordinates of SDC (110)/Irn and (111)/Irn (n = 1, 5, 6, 11, 15) models used in DFT calculations.
Supplementary Data 3
Atomic coordinates of the initial and final configurations of the trajectories in AIMD simulations.
Source data
Source Data Fig. 2
Gibbs free energies for the CO2 hydrogenation reaction calculated by DFT.
Source Data Fig. 3
Characterization data of XRD patterns, HAADF line profiles, XPS spectra and EELS spectra.
Source Data Fig. 4
Electrochemical measurement data and DRIFTS spectra.
Source Data Fig. 5
Electrochemical measurement data.
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Li, M., Hua, B., Wang, LC. et al. Switching of metal–oxygen hybridization for selective CO2 electrohydrogenation under mild temperature and pressure. Nat Catal 4, 274–283 (2021). https://doi.org/10.1038/s41929-021-00590-5
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DOI: https://doi.org/10.1038/s41929-021-00590-5
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