Communication—Electrolysis at High Efficiency with Remarkable Hydrogen Production Rates

Wood, Anthony; Hong, He; Joia, Tahir; Krivy, Mark; Steedman, Dale

doi:10.1149/2.0341605jes

Cited by 25 publications

(9 citation statements)

References 7 publications

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“…[127,128] The proton exchange membrane (PEM) is younger technology that shows higher efficiencies. [131,132] The main bottlenecks to establishing electrolysis as ap referred technology to produce H 2 are the price of crude oil and the price of renewable energy,t hat is, competition between old and new technologies. [125] However,m anyo ft he PEM electrolyzers use IrO 2 as their anode catalyst, which increases the capex.…”

Section: Implementation Of Co 2 Hydrogenation In Industrymentioning

confidence: 99%

“…[130] Solid oxide electrolysis cells operate at ah igh temperature (950-1000 8C), which resultsi nh ighere fficiencies;t his technology is still in development. [131,132] The main bottlenecks to establishing electrolysis as ap referred technology to produce H 2 are the price of crude oil and the price of renewable energy,t hat is, competition between old and new technologies. The price of renewable H 2 mainly dependso nt he cost of renewable electricity and the cost of electrolysis technology.…”

Section: Implementation Of Co 2 Hydrogenation In Industrymentioning

confidence: 99%

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A Critical Look at Direct Catalytic Hydrogenation of Carbon Dioxide to Olefins

2019

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ReviewsScheme2.Redox (left) and associative (right) reaction pathways for the RWGS reaction. [82] Scheme3.Reduction and carburization steps of an iron-based catalyst. [83] Scheme4.Catalytic activity (top) and iron-phase composition of the catalyst (bottom) as af unction of time during the reaction. Reactionconditions:H 2 / CO 2 = 3, 250 8C, 1MPa, FeÀAlÀCuÀ9K catalyst. FT refers to the Fischer-Tropschr eaction. Arrows indicatethe increase or decrease of reaction yield/iron phase during ac ertain episode. [84] ChemSusChem

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Section: Implementation Of Co 2 Hydrogenation In Industrymentioning

confidence: 99%

Section: Implementation Of Co 2 Hydrogenation In Industrymentioning

confidence: 99%

A Critical Look at Direct Catalytic Hydrogenation of Carbon Dioxide to Olefins

2019

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“…Currently, more than 90% of the hydrogen produced worldwide is generated from methane steam reforming (SMR), which has a high energy intensity and contributes to emitting GHGs 7,8 . Besides SMR, other technologies such as the electrolysis of water have been used for hydrogen production, however, it suffers from a low energy efficiency of around 25% 9,10 . However, hydrogen produced from biomass feedstocks is considered a autothermal reforming sustainable way for hydrogen production with less net CO 2 emissions.…”

Section: Introductionmentioning

confidence: 99%

Optimization of hydrogen production via catalytic autothermal reforming of crude glycerol using response surface methodology and artificial neural network

2021

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Summary In this work, the central composite design of the response surface methodology (RSM) and artificial neural network (ANN) were deployed to investigate process variables and optimize hydrogen gas production via autothermal reforming of crude glycerol using 5%Ni/CeZrCa catalyst in a packed bed tubular reactor. The input variables studied are reaction temperature, feed flow rate, steam to carbon ratio (S/C), oxygen to carbon ratio (O/C), and catalyst weight. The neural network analysis of these input variables measured their individual significance and contribution in the autothermal reforming process prior to the development of a quadratic polynomial model with RSM for predicting hydrogen yield as well as optimization. Statistical analyses showed that the mathematical model developed excellently represents the data with high model adequacy and no significant lack of fit. The results of the neural network input variable significance ranking approach showed that the reaction temperature contributed more than any other independent variable at a ranking weight of 53% while the O/C ratio showed the least impact at 3%. The results of the optimization gave the optimum parameters for hydrogen gas yield as follows; Temperature: 650°C, crude glycerol flow rate: 3.3 mmol C/min, S/C: 2.34, O/C: 0.052, and catalyst weight of 0.15 g with a maximum feed conversion of approximately 92% and 97% H2 yield. ANN provided a better regression with excellent statistical test values as follows R2: 0.999, MSE: 10−8, AAD: 0.34%, and RMSE: 3.5 × 10−4%. It is clear from the results of the model adequacy and error calculations that ANN is superior and has shown a better model fit than the RSM.

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“…Fuel electrode-supported cells achieve higher current densities in thermoneutral operation. Current densities of up to −6 A/cm 2 are reported [8], but long-term operation with a sufficiently low degradation rate is mostly reported for current densities below −1 A/cm 2 . At higher current densities the degradation rate increases significantly [9,10].…”

Section: Introductionmentioning

confidence: 99%

Femtosecond Laser-Induced Surface Modification of the Electrolyte in Solid Oxide Electrolysis Cells

et al. 2020

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Electrolyte-supported solid oxide cells are often used for steam electrolysis. Advantages are high mechanical stability and a low degradation rate. The aim of this proof of concept study was to use a femtosecond laser to process the electrolyte of an electrolyte-supported solid oxide cell and evaluate the effect of this laser treatment on the electrochemical performance. The femtosecond laser treatment induces a macroscopic and a superimposed microscopic structure. It can be proven that the electrolyte remains gas tight and the electrochemical performance increases independently of the laser parameters. The initial area-specific resistance degradation during a constant current measurement of 200 h was reduced from 7.9% for a non-treated reference cell to 3.2% for one of the laser-treated cells. Based on electrochemical impedance measurements, it was found that the high frequency resistance of the laser-treated cells was reduced by up to 20% with respect to the reference cell. The impedance spectra were evaluated by calculating the distribution of relaxation times, and in advance, a novel approach was used to approximate the gas concentration resistance, which was related to the test setup and not to the cell. It was found that the low frequency polarization resistance was increased for the laser-treated cells. In total, the area-specific resistance of the laser-treated cells was reduced by up to 14%.

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Communication—Electrolysis at High Efficiency with Remarkable Hydrogen Production Rates

Cited by 25 publications

References 7 publications

A Critical Look at Direct Catalytic Hydrogenation of Carbon Dioxide to Olefins

A Critical Look at Direct Catalytic Hydrogenation of Carbon Dioxide to Olefins

Optimization of hydrogen production via catalytic autothermal reforming of crude glycerol using response surface methodology and artificial neural network

Femtosecond Laser-Induced Surface Modification of the Electrolyte in Solid Oxide Electrolysis Cells

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