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AKE: Arbeitskreis Energie

AKE 12: Artificial Photosynthesis, CO2-Reduction

AKE 12.2: Vortrag

Mittwoch, 13. März 2019, 15:45–16:00, U A-Esch 1

Photoelectrochemical CO₂ reduction as a negative emission technology — •Matthias M. May¹ and Kira Rehfeld² — ¹Helmholtz-Zentrum Berlin, Institute for Solar Fuels — ²Universität Heidelberg, Institute of Environmental Physics

Current CO₂ emission rates are incompatible with the 2^∘C target for global warming. Negative emission technologies are therefore an important, but also controversial basis for climate policy scenarios. For this, energy is actively invested for the removal of dilute CO₂ from the atmosphere, followed by sequestration. We show that photoelectrochemical CO₂ reduction might be a viable, high-efficiency alternative to biomass-based approaches, which reduces competition for arable land [1]. To develop them, electrochemical reactions have to be optimised for CO₂ removal. This deviates from energetic efficiency optimisation in solar fuel applications and hence renders different carbon sink products attractive. Here, we discuss efficiency limitations of the approach.

[1] May and Rehfeld, Earth Syst. Dynam. Discuss., in review, 2018, DOI:10.5194/esd-2018-53.