Abstract
The production of syngas by simultaneous splitting of direct-air-captured CO2 and H2O via a solar thermochemical redox cycle is a competitive alternative to electrolysis-based pathways. Isothermal or near-isothermal operation using high-entropy oxides that are readily available, robust, and flowable is recommended on the basis of practical considerations and improved performance, both mechanical and thermodynamic. Ongoing research efforts should direct attention toward devising compatible thermal energy storage technologies and/or incorporating hybrid solar-electric heating to (1) mitigate the effects of solar intermittency and (2) provide a continuous feed for downstream gas-to-liquid processing. The path forward involves funding the development and characterization of fully integrated laboratory systems.
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