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Theoretical efficiency limits of photoelectrochemical CO2 reduction: A route‐dependent thermodynamic analysis

journal contribution
posted on 04.05.2020 by Evangelos Kalamaras, Huizhi Wang, M Mercedes Maroto‐Valer, John M Andresen, Jin Xuan
© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim Solar-fuel formation via photoelectrochemical (PEC) routes using water and CO2 as feedstock has attracted much attention. Most PEC CO2 reduction studies have been focused on the development of novel photoactive materials; however, there is still a lack of understanding of the key limiting factors of this process. In this study, the theoretical limits of Solar-to-Fuel (STF) efficiencies of single- and dual-junction photo-absorbing materials are illustrated for single-step multi-electron CO2 reduction into fuels including HCOO−, CO, CH3OH and C2H5OH. It is also highlighted that STF efficiency depends on the route of two-step PEC CO2 reduction process using CH3OH as a model fuel. Finally, it is illustrated the beneficial role of alternative strategies such as dual-junction photo-absorbing electrodes, externally applied bias and subsequent reactor chambers on the maximum theoretical efficiencies of PEC CO2 reduction.

Funding

Engineering and Physical Sciences Research Council (EPSRC). Grant Numbers: EP/K021796/1, EP/N009924/1, EP/R012164/2

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Chemical Engineering

Published in

ChemPhysChem

Volume

21

Issue

3

Pages

232 - 239

Citation

Kalamaras, E. ... et al., 2020. Theoretical Efficiency Limits of Photoelectrochemical CO2 Reduction: A Route-Dependent Thermodynamic Analysis. ChemPhysChem, 21(3), pp. 232-239.

Publisher

Wiley

Version

AM (Accepted Manuscript)

Rights holder

© Wiley

Publisher statement

This is the peer reviewed version of the following article: Kalamaras, E. ... et al., 2020. Theoretical Efficiency Limits of Photoelectrochemical CO2 Reduction: A Route-Dependent Thermodynamic Analysis. ChemPhysChem, 21(3), pp. 232-239, which has been published in final form at https://doi.org/10.1002/cphc.201901041. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions

Acceptance date

17/12/2019

Publication date

2019-12-17

Copyright date

2020

ISSN

1439-4235

eISSN

1439-7641

Language

en

Depositor

Prof Jin Xuan . Deposit date: 4 May 2020

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