Alkaline anion exchange membrane water electrolysis: Effects of electrolyte feed method and electrode binder content

Cho, Min Kyung; Park, Hee-Young; Lee, Hye Jin; Kim, Hyoung‐Juhn; Lim, Ahyoun; Henkensmeier, Dirk; Yoo, Sung Jong; Kim, Jin Young; Lee, So Young; Park, Hyun S.; Jang, Jong Hyun

doi:10.1016/j.jpowsour.2018.02.025

Cited by 113 publications

(93 citation statements)

References 55 publications

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“…Furthermore, some of us found a 5.8 times improved cell performance when the cathode feed of an AEM based system was changed from DI water to none. [35] As shown in Figure S8, the initial performance of such a system was very promising (> 470 mA cm -2 at 1.8V), but dropped rapidly to ca. 230 mA cm -2 .…”

Section: Water and Koh Flux Through Membranesmentioning

confidence: 92%

“…At that current density, the performance seemed to stabilize, but the cell had to be switched off because alkaline solution leaked through the cathode gas outlet. Since this was not observed at an anode feed concentration of 0.5 M KOH when operating cells with Tokuyama A201 [35] or Fumatech's FAA3-PK-75 membrane, it seems to be important to measure the membranes' liquid/liquid electrolyte permeation. As expected, weight gain during doping ( Figure 3) and permeation increase with the KOH concentration in the doping bath ( Figure 11).…”

Section: Water and Koh Flux Through Membranesmentioning

confidence: 99%

“…However, when the KOH concentration was varied between 10 wt% and 20 wt%, the permeation of KOH solution through the ion-solvating membranes increased by 2 orders of magnitude. Therefore, a strategy for future work on ionsolvating membranes could be to operate the system at low KOH concentrations and without cathode feed, to improve electrolyzer performance [35] and alkaline stability.…”

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confidence: 99%

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Blend membranes of polybenzimidazole and an anion exchange ionomer (FAA3) for alkaline water electrolysis: Improved alkaline stability and conductivity

Konovalova

Kim

et al. 2018

Journal of Membrane Science

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Section: Water and Koh Flux Through Membranesmentioning

confidence: 92%

Section: Water and Koh Flux Through Membranesmentioning

confidence: 99%

mentioning

confidence: 99%

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Blend membranes of polybenzimidazole and an anion exchange ionomer (FAA3) for alkaline water electrolysis: Improved alkaline stability and conductivity

Konovalova

Kim

et al. 2018

Journal of Membrane Science

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“…The average voltage of the traditional electrolyzer was reduced by 49 V at the current of 12.5 kA, and the dc power consumption was reduced significantly. Cho et al studied the influence of cathode feed mode and anode binder content on electrolyzer characteristics of anion exchange membrane and constructed a high performance AWE. Studies show that the pre‐feeding 0.5 ml KOH aqueous can significantly improve the water electrolysis performance of anion exchange membrane.…”

Section: Introductionmentioning

confidence: 99%

Structure design and control strategy of a new alkaline water electrolyzer based on heat exchange

Shen

Zhang

et al. 2019

Int J Energy Res

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Summary The overall energy conversion efficiency and the power regulation performance of the volatile renewable energy alkaline water electrolyzer (AWE) hydrogen production system need to be improved. Efficient use of heat in the electrolysis process and optimization of the control strategy are technically feasible. According to the concept of heat exchange utilization, this paper proposes a series parallel modular structure of AWE, which realizes heat exchange and utilization between modules. Based on the electrothermal characteristics of AWE and the power fluctuation characteristics of volatile energy, the function positioning and control strategy of the module are proposed. Theoretical analysis, together with a case study, has been conducted to show the overall efficiency and power regulation characteristics of the traditional AWE, the traditional combined AWE and the proposed new AWE under various working scenarios. Research study results show that the proposed new structure and control strategy can effectively improve the overall energy efficiency and static as well as dynamic power regulation characteristics of the electrolyzer, with the energy efficiency increased up to 16%. Although the static power range decreases slightly in some conditions, it always maintains the ability of wide range regulation. The findings can provide reference for the research and development of new AWE that improve the power response capability and the comprehensive utilization of energy under the premise of ensuring a certain power adjustment range.

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“…Given these advantages, membrane-separated electrochemical reactors will play an important role in the transition from heat-powered to electricity-driven chemical While the use of membranes has been extensively investigated in inorganic electrochemical processes (e.g. chloralkali and water splitting [5][6][7][8][9][10][11][12][13][14][15] 16,17 . Their performance is commonly defined by ionic conductivity, reactant permeability, and durability.…”

Section: Introductionmentioning

confidence: 99%

Design Guidelines for Membrane-separated Organic Electrosynthesis: The Case of Adiponitrile Production

Blanco¹,

Prasad²,

Dunnigan³

et al. 2019

Preprint

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<div> <p>The on-going efforts to transition from thermal to electricity-driven processes can enable the easy integration of renewable energy sources and sustainable practices in chemical manufacturing. Organic electrosynthetic processes are key players in this transition, but face important challenges regarding selectivity and energy efficiency. Although membrane-separated flow reactors can help address these issues, a deeper understanding of membrane behavior in organic electrosynthesis electrolytes is required. In this study, we evaluate the effect of organic reactants on the conductivity and permeability of one cation exchange membrane (Nafion 117) and two anion exchange membranes (Sustainion and Fumasep FAB), and later assess the advantages of their implementation in flow reactors for organic electrosynthesis. This is done in the context of the electrohydrodimerization of acrylonitrile to adiponitrile, the largest organic electrosynthesis in industry. The presence of organic molecules led to important losses in membrane conductivity, however no significant contribution to reactor overpotential was observed from their implementation in membrane-separated reactors. Furthermore, permeabilities between 0.4 – 1.2 x 10-6 cm2 s-1 towards organic molecules led to low crossover of organics and improved reactor selectivity. Undivided reactors yielded selectivities as high as 48% (40 mA cm-2 and 4 V), while selectivities of 77% (20 mA cm-2 and 2.7 V) and 81% (40 mA cm-2 and 3 V) were obtained with Nafion and Sustainion-separated reactors, respectively. The demonstrated improvement in energy efficiency for continuous organic electrosynthesis processes makes the insights from this work a significant step in the development of sustainable electrochemical manufacturing processes. </p> </div> <br>

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Alkaline anion exchange membrane water electrolysis: Effects of electrolyte feed method and electrode binder content

Cited by 113 publications

References 55 publications

Blend membranes of polybenzimidazole and an anion exchange ionomer (FAA3) for alkaline water electrolysis: Improved alkaline stability and conductivity

Blend membranes of polybenzimidazole and an anion exchange ionomer (FAA3) for alkaline water electrolysis: Improved alkaline stability and conductivity

Structure design and control strategy of a new alkaline water electrolyzer based on heat exchange

Design Guidelines for Membrane-separated Organic Electrosynthesis: The Case of Adiponitrile Production

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