Fuel production from CO2 using solar-thermal energy: system level analysis

Kim, Jiyong; Johnson, Terry A.; Miller, James E.; Stechel, Ellen B.; Maravelias, Christos T.

doi:10.1039/c2ee21798h

Cited by 185 publications

(139 citation statements)

References 11 publications

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“…After the formation of the CO 2 À intermediate, a rate-determining chemical step occurs, followed by a final and relatively fast electron transfer step. A similar study on HCO 3 À concentration shows a zeroorder dependence on CO 2 activity, indicating that the donation of a proton from HCO 3 À is not a rate-determining step for CO 2 reduction on Ag surfaces (Supplementary Fig. 13).…”

Section: Discussionmentioning

confidence: 78%

“…Another possibility is that the proton is donated from the H 2 O in the electrolyte. However, although the concentration of H 2 O is about 100 times larger than HCO 3 À in the electrolyte, HCO 3 À is actually a more than 10 5 times better hydrogen donor. Therefore, a more likely scenario is that the rate-determining step is not the protonation of CO 2 À intermediate but the surface migration of HCO 3 À to the surface sites inside the pores of np-Ag.…”

Section: Discussionmentioning

confidence: 94%

“…However, although the concentration of H 2 O is about 100 times larger than HCO 3 À in the electrolyte, HCO 3 À is actually a more than 10 5 times better hydrogen donor. Therefore, a more likely scenario is that the rate-determining step is not the protonation of CO 2 À intermediate but the surface migration of HCO 3 À to the surface sites inside the pores of np-Ag. With high intrinsic activity, extremely large surface area and superior stability, np-Ag represents the best silver-based electrocatalyst reported so far for CO 2 electroreduction to CO in aqueous electrolyte.…”

Section: Discussionmentioning

confidence: 94%

“…A freshly prepared np-Ag electrode was used for electrolysis at each data point and the CO partial current densities were measured at À 0.35 V versus RHE. The [HCO 3 À ] dependence study was conducted at concentrations varying from 0.1 to 1.0 M. NaClO 4 (Sigma-Aldrich, 99.99%) was added to the lowconcentration electrolytes to keep a same electrolyte ionic strength. A freshly prepared np-Ag electrode was used for electrolysis at each data point and the CO partial current densities were measured at À 1.01 V versus Ag/AgCl (corresponding to À 0.38 V versus RHE at pH 7.2).…”

Section: Electrochemical Characterizations and Product Analysis A Prmentioning

confidence: 99%

“…R eduction in greenhouse CO 2 emissions from fossil fuel utilization is critical for human society [1][2][3] . Ideally, one would like to convert CO 2 produced in power plants, refineries and petrochemical plants to fuels or other chemicals through renewable energy utilization [4][5][6] .…”

mentioning

confidence: 99%

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A selective and efficient electrocatalyst for carbon dioxide reduction

et al. 2014

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Converting carbon dioxide to useful chemicals in a selective and efficient manner remains a major challenge in renewable and sustainable energy research. Silver is an interesting electrocatalyst owing to its capability of converting carbon dioxide to carbon monoxide selectively at room temperature; however, the traditional polycrystalline silver electrocatalyst requires a large overpotential. Here we report a nanoporous silver electrocatalyst that is able to electrochemically reduce carbon dioxide to carbon monoxide with approximately 92% selectivity at a rate (that is, current) over 3,000 times higher than its polycrystalline counterpart under moderate overpotentials of o0.50 V. The high activity is a result of a large electrochemical surface area (approximately 150 times larger) and intrinsically high activity (approximately 20 times higher) compared with polycrystalline silver. The intrinsically higher activity may be due to the greater stabilization of CO 2 À intermediates on the highly curved surface, resulting in smaller overpotentials needed to overcome the thermodynamic barrier.

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Section: Discussionmentioning

confidence: 78%

Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 94%

Section: Electrochemical Characterizations and Product Analysis A Prmentioning

confidence: 99%

mentioning

confidence: 99%

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A selective and efficient electrocatalyst for carbon dioxide reduction

et al. 2014

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Solar Fuel Generation: The Relevance and Approaches

Rodriguez‐Gutierrez,

Souza,

Varghese

2024

Conversion of Water and CO2 to Fuels Using Solar Energy

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A First‐Principles‐Based Sub‐Lattice Formalism for Predicting Off‐Stoichiometry in Materials for Solar Thermochemical Applications: The Example of Ceria

Gautam

Stechel

Carter

2020

Advcd Theory and Sims

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Theoretical models that reliably can predict off‐stoichiometry in materials via accurate descriptions of underlying thermodynamics are crucial for energy applications. For example, transition‐metal and rare‐earth oxides that can tolerate a large number of oxygen vacancies, such as CeO2 and doped CeO2, can split water and carbon dioxide via a two‐step, oxide‐based solar thermochemical (STC) cycle. The search for new STC materials with a performance superior to that of state‐of‐the‐art CeO2 can benefit from predictions accurately describing the thermodynamics of oxygen vacancies. The sub‐lattice formalism, a common tool used to fit experimental data and build temperature‐composition phase diagrams, can be useful in this context. Here, sub‐lattice models are derived solely from zero‐temperature quantum mechanics calculations to estimate fairly accurate temperature‐ and oxygen‐partial‐pressure‐dependent off‐stoichiometries in CeO2 and Zr‐doped CeO2. Physical motivations for deriving some of the “excess” sub‐lattice model parameters directly from quantum mechanical calculations, instead of fitting to minimize deviations from experimental and/or theoretical data, are identified. Important limitations and approximations of the approach used are specified and extensions to multi‐cation oxides are also suggested to help identify novel candidates for water and carbon dioxide splitting and related applications.

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Fuel production from CO2 using solar-thermal energy: system level analysis

Cited by 185 publications

References 11 publications

A selective and efficient electrocatalyst for carbon dioxide reduction

A selective and efficient electrocatalyst for carbon dioxide reduction

Solar Fuel Generation: The Relevance and Approaches

A First‐Principles‐Based Sub‐Lattice Formalism for Predicting Off‐Stoichiometry in Materials for Solar Thermochemical Applications: The Example of Ceria

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