Co-Electrolysis, Quo Vadis?

Foit, Severin; Dittrich, Lucy; Vibhu, Vaibhav; Vinke, Izaak C.; Eichel, Rüdiger-Albert; Haart, L.G.J. de

doi:10.1149/07801.3139ecst

Cited by 12 publications

(13 citation statements)

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“…Co-electrolysis can be performed at either high [25][26][27][28][29][30][31][32][33] or low 34,35 temperatures. The high-temperature co-electrolysis makes use of the available SOC technology.…”

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confidence: 99%

High-Temperature Co-Electrolysis: A Versatile Method to Sustainably Produce Tailored Syngas Compositions

Dittrich

Nohl

Jaekel

et al. 2019

J. Electrochem. Soc.

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High-temperature co-electrolysis of carbon dioxide and steam is a promising method to produce 'white' syngas by making use of renewable energy and carbon dioxide as sustainable feedstock. The technological key advantage is the possibility to tailor syngas compositions over a broad range. This paper presents a systematic investigation of the syngas tailoring process by establishing relationships between feed gas compositions and flow rates to the syngas ratio. A linear dependence between the H 2 O:CO 2 ratio in the feed gas and the H 2 :CO ratio in the output gas was observed. Furthermore, the syngas ratio remains mostly invariant upon variations in electrochemical potential and fluctuating gas utilizations/flow rates during operation of a co-electrolysis cell. Most importantly, the co-electrolysis performance was demonstrated to operate at high current densities of up to 3.2 A•cm −2 over a broad range of feed gas compositions with faradaic efficiencies of nearly 100%. The possibility to operate co-electrolysis under transient load conditions renders this method particularly suitable in future scenarios of intermittent availability of renewables. The results described here illustrate the versatility of co-electrolysis, which can produce all relevant syngas compositions in a single-step process at constantly high performance.

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confidence: 99%

High-Temperature Co-Electrolysis: A Versatile Method to Sustainably Produce Tailored Syngas Compositions

Dittrich

Nohl

Jaekel

et al. 2019

J. Electrochem. Soc.

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“…It is difficult to obtain directly quantitative trends from these measurements. The electrochemical properties of the electrodes can be described quantitatively using the following key parameters: (1) the measured open-circuit potential E OCP (Figure 9a), (2) the current density at a given overpotential of 100 mV (Figure 9b), and (3) the required overpotential at a given current density of 333 μA•cm −2 , which corresponds to a current of 1 mA (Figure 9c).…”

Section: Descriptive Key Parameters Derived From Lsv Measurementsmentioning

confidence: 99%

“…As the global production of renewable energy is on the rise, demand for sustainable ways of storing this energy in times of overproduction increases [1]. Systems based on abundant, cheap materials with high energy densities are required.…”

Section: Introductionmentioning

confidence: 99%

The effect of cobalt on morphology, structure, and ORR activity of electrospun carbon fibre mats in aqueous alkaline environments

Gehring¹,

Kutsch²,

Camara³

et al. 2021

Beilstein J. Nanotechnol.

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An innovative approach for the design of air electrodes for metal–air batteries are free-standing scaffolds made of electrospun polyacrylonitrile fibres. In this study, cobalt-decorated fibres are prepared, and the influence of carbonisation temperature on the resulting particle decoration, as well as on fibre structure and morphology is discussed. Scanning electron microscopy, Raman spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, elemental analysis, and inductively coupled plasma optical emission spectrometry are used for characterisation. The modified fibre system is compared to a benchmark system without cobalt additives. Cobalt is known to catalyse the formation of graphite in carbonaceous materials at elevated temperatures. As a result of cobalt migration in the material the resulting overall morphology is that of turbostratic carbon. Nitrogen removal and nitrogen-type distribution are enhanced by the cobalt additives. At lower carbonisation temperatures cobalt is distributed over the surface of the fibres, whereas at high carbonisation temperatures it forms particles with diameters up to 300 nm. Free-standing, current-collector-free electrodes assembled from carbonised cobalt-decorated fibre mats display promising performance for the oxygen reduction reaction in aqueous alkaline media. High current densities at an overpotential of 100 mV and low overpotentials at current densities of 333 μA·cm−2 were found for all electrodes made from cobalt-decorated fibre mats carbonised at temperatures between 800 and 1000 °C.

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“…Generally, such integrated P2G processes are preferable compared to their conventional counterparts due to the special advantage of high-temperature co-electrolysis to produce tailor-made syngas compositions and adjust the H 2 /CO ratio. [14][15][16][17][18] Additionally, in the second step, the syngas generated by co-electrolysis can be directly converted to SNG via methanation. To date, only few reports are available on the direct SNG production from CO 2 and H 2 O using different types of electrochemical reactors.…”

Section: Introductionmentioning

confidence: 99%

Integrated Co‐Electrolysis and Syngas Methanation for the Direct Production of Synthetic Natural Gas from CO₂ and H₂O

et al. 2021

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The concept of an integrated power-to-gas (P2G) process was demonstrated for renewable energy storage by converting renewable electrical energy to synthetic fuels. Such a dynamically integrated process enables direct production of synthetic natural gas (SNG) from CO 2 and H 2 O. The produced SNG can be stored or directly injected into the existing natural gas network. To study process integration, operating parameters of the hightemperature solid oxide electrolysis cell (SOEC) producing syngas (H 2 + CO) mixtures through co-electrolysis and a fixed bed reactor for syngas methanation of such gas mixtures were first optimized individually. Reactor design, operating conditions, and enhanced SNG selectivity were the main targets of the study. SOEC experiments were performed on state-of-the-art button cells. Varying operating conditions (temperature, flow rate, gas mixture and current density) emphasized the capability of the system to produce tailor-made syngas mixtures for downstream methanation. Catalytic syngas methanation was performed using hydrotalcite-derived 20 %Ni-2 %Fe/(Mg,Al) O x catalyst and commercial methanation catalyst (Ni/Al 2 O 3 ) as reference. Despite water in the feed mixture, SNG with high selectivity (� 90 %) was produced at 300°C and atmospheric pressure. An adequate rate of syngas conversion was obtained with H 2 O contents up to 30 %, decreasing significantly for 50 % H 2 O in the feed. Compared to the commercial catalyst, 20 %Ni-2 %Fe/(Mg,Al)O x enabled a higher rate of CO x conversion.

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Co-Electrolysis, Quo Vadis?

Cited by 12 publications

References 2 publications

High-Temperature Co-Electrolysis: A Versatile Method to Sustainably Produce Tailored Syngas Compositions

High-Temperature Co-Electrolysis: A Versatile Method to Sustainably Produce Tailored Syngas Compositions

The effect of cobalt on morphology, structure, and ORR activity of electrospun carbon fibre mats in aqueous alkaline environments

Integrated Co‐Electrolysis and Syngas Methanation for the Direct Production of Synthetic Natural Gas from CO₂ and H₂O

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Co-Electrolysis, Quo Vadis?

Cited by 12 publications

References 2 publications

High-Temperature Co-Electrolysis: A Versatile Method to Sustainably Produce Tailored Syngas Compositions

High-Temperature Co-Electrolysis: A Versatile Method to Sustainably Produce Tailored Syngas Compositions

The effect of cobalt on morphology, structure, and ORR activity of electrospun carbon fibre mats in aqueous alkaline environments

Integrated Co‐Electrolysis and Syngas Methanation for the Direct Production of Synthetic Natural Gas from CO2 and H2O

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Integrated Co‐Electrolysis and Syngas Methanation for the Direct Production of Synthetic Natural Gas from CO₂ and H₂O