ISRU Challenge Production of O2 and Fuel from CO2

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ISRU Challenge Production of O2 and Fuel from CO2 ( isru-challenge-production-o2-and-fuel-from-co2 )

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5. Electrochemical Studies of Non-Aqueous-based CO2 Reduction As noted above, given the challenges of mining, transporting, purifying, and delivering water from Mars resources to a PEC or EC reactor system, the non-aqueous-based CO2 reduction system is perhaps the first logical step toward implementing an efficient low-temperature oxygen generation scheme. In this section, we describe some preliminary experimental work at JPL to assess the viability of the reaction pathway operating at low temperatures relative to SOXE approaches. 5.1 Fundamental Electrochemistry A recent report (Sampson & Kubiak, 2016) described reductive dimerization of CO2, generating CO and CO32- as products according to Process A (Equation 5.1): 2CO2+2e– −−→CO+CO32- (5.1,ProcessA) This offers a potentially efficient means for converting CO2 into useful products, which could be useful in the context of Mars ISRU if the by-product CO32- could be oxidized into O2 according to Process B (Equation 5.2): CO32- −−→ 12 O2 + CO2 + 2 e– (5.2, Process B) That is, a full electrolysis cell could be envisaged whereby Process A occurs at the cathode (generating CO, which could be used as low-grade fuel) and CO32- is transported via an anion- exchange membrane (as known for fuel cell technologies; Vega et al., 2010) to the anode, where it is converted to O2 via Process B (with concomitant release of CO2). Hence, the work described

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