Solar Air-to-Fuel Technologies for a Circular Carbon Economy
Sayan Kar, Erwin Reisner
TL;DR
This paper discusses technologies that use solar energy to convert atmospheric CO2 into fuels and chemicals, aiming to create a sustainable circular carbon economy.
Contribution
The paper introduces emerging solar-powered air-to-fuel technologies and outlines strategies to overcome challenges in CO2 conversion.
Findings
Solar-powered air-to-fuel technologies can help reduce atmospheric CO2 while producing synthetic fuels.
Key challenges include low CO2 concentration, CO2 stability, and interference from oxygen in air.
Scalability and future research directions are critical for achieving a net-zero carbon economy.
Abstract
The CO2 present in our atmosphere is a universally available and abundant carbon feedstock, but it exists only in dilute concentrations (currently around 427 ppm). Clean technologies capable of capturing atmospheric CO2 using direct air capture and directly converting it into synthetic fuels and chemicals using solar energy could pave the way for a circular chemical industry. Challenges in developing such a solar-powered air-to-fuel technology that mimics photosynthesis include the use of the low CO2 concentration in air, the thermodynamic stability of CO2 (and its capture products), the high O2 content (21%) in air (which often interferes with catalytic CO2 valorization), and the presence of variable moisture levels. This perspective explores different concepts and emerging technologies for the solar-powered conversion of atmospheric CO2 into fuels and chemicals, examines their…
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Taxonomy
TopicsChemical Looping and Thermochemical Processes · Solar Energy Systems and Technologies · Climate Change and Geoengineering