Long-term-stability continuous flow CO<sub>2</sub>reduction electrolysers with high current efficiency

Gu, Yuanzheng; Wei, Jucai; Li, Jindong; Wang, Luyang

doi:10.1039/d0se01707h

Cited by 12 publications

(16 citation statements)

References 43 publications

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“…1. Both adopted a common membrane electrode assembly (MEA) configuration 7,21 , except that a liquid buffer layer was added at the cathode side of the second one. Two different cathode feeding methods were used in the MEA configuration (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The Au nanoparticles supported on N-doped carbon (Au/CN) were synthesized by following our previous report 7 . The gold mass ratio of the Au/CN catalysts was 20 wt% and the particle size of gold nanoparticles was mainly distributed around 2 nm.…”

Section: Catalysts and Gas Diffusion Electrodes Preparationmentioning

confidence: 99%

“…The energy efficiency (EE) is defined by the ratio between the thermodynamic voltage to the practical cell voltage. The energy efficiency of CO (COCE) needs to be multiplied by its current efficiency 7 .…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

“…This research has pointed out a way on how to improve the CO 2 RR catalytic performance in flow cells, leaving aside the characteristics of the catalyst itself.Achieving the peak carbon dioxide emissions and carbon-neutral objective requires advanced CO 2 utilization technologies and reliable high-capacity renewable energy storage systems, for which the reduction of CO 2 to produce valuable chemicals by direct electrolysis is a promising approach 1-5 . Currently, one of the main problems of CO 2 electrolysers is the insufficient time-space yield or current density at working voltages 6,7 .In addition to the inherent properties of the cathode catalyst, all components of the flow-cell may have impacts on the electrolyser cell performance 8,9 , including but not limited to electrode preparation processes 10,11 , electrolyte compositions and concentrations, temperatures 12,13 , gas pressures 14 , electrochemical membrane reactor configurations 8 , polymer electrolyte membranes 15 , and polymeric binders 16 . Jhong et al 10 compared the influence of catalyst layer deposition methodology on electrode catalytic performance, the partial current density of CO production (j CO ) obtained with the air-brushed cathode was higher (~ 87 mA cm −2 at − 1.68 V vs. Ag/AgCl) than that of the hand-painted cathode, with an increase of about 10 mA cm −2 .…”

mentioning

confidence: 99%

“…Achieving the peak carbon dioxide emissions and carbon-neutral objective requires advanced CO 2 utilization technologies and reliable high-capacity renewable energy storage systems, for which the reduction of CO 2 to produce valuable chemicals by direct electrolysis is a promising approach 1-5 . Currently, one of the main problems of CO 2 electrolysers is the insufficient time-space yield or current density at working voltages 6,7 .…”

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confidence: 99%

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A study on improving the current density performances of CO2 electrolysers

Wei

et al. 2021

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Electrochemical CO2 reduction reaction (CO2RR) technology can reduce CO2 emission with converting excess electrical energy to high-value-added chemicals, which however needs further improvement on the electrolyser cell performance. In this work, extensive factors were explored in continuous CO2 electrolysers. Gold, one of the benchmark materials for CO2RR to produce CO, was used as the catalyst. Electrolyser configurations and membrane types have significant influences on cell performance. Compact MEA-constructed gas-phase electrolyser showed better catalytic performance and lower energy consumption. The gas diffusion electrode with a 7:1 mass ratio of total-catalyst-to-polytetrafluoroethylene (PTFE) ionomer exhibited the best performance. At a low total cell voltage of 2.2 V, the partial current density of CO production achieved 196.8 mA cm−2, with 90.6% current efficiency and 60.4% energy efficiency for CO producing respectively. Higher CO selectivity can be achieved using anion exchange membranes, while higher selectivity for hydrogen and formate products can be achieved with cation exchange membranes. This research has pointed out a way on how to improve the CO2RR catalytic performance in flow cells, leaving aside the characteristics of the catalyst itself.

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Section: Resultsmentioning

confidence: 99%

Section: Catalysts and Gas Diffusion Electrodes Preparationmentioning

confidence: 99%

Section: Electrochemical Measurementsmentioning

confidence: 99%