Status and Prospects of Alkaline Electrolysis

Zhang, Dongke; Zeng, Kai

doi:10.1002/9783527674268.ch13

Cited by 3 publications

(3 citation statements)

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“…However, the challenges for widespread use of WE are to improve its efficiency and reduce the cost and energy consumption . Compared to solid polymer electrolyte WE, the traditional liquid alkaline WE possesses the advantages of long historical development, low cost, and long‐term stability . In general, this setup consists of an anode, a cathode, liquid electrolyte solution, and a direct current (DC) power supply.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study and analytical modeling of an alkaline water electrolysis cell

Chen

Mojica

et al. 2017

Int J Energy Res

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Summary A traditional alkaline aqueous electrolyzer is investigated by using a 3‐electode structure that enables the reaction resistance of each individual electrode to be accurately monitored. Combining experimental observations with resistance‐based model analysis, we establish a quantitative relationship between current density and key voltage losses, including losses due to thermodynamics, kinetics, ohmic, and mass transport. These results demonstrate that the oxygen evolution reaction and bubble effects play crucial roles in determining electrolyzer performance. By varying the distance between electrodes, 2 effective OH− conductivities in 0.4M KOH are found to be 0.1333 and 0.9650 second cm−1, depending on bubble formation and release rate at the electrode interface. Moreover, bubble coverage on electrode surface achieves a steady state of 96% when current density is above 0.1 A cm−2. In the study of various electrolyte concentrations, all the model predictions show good agreement with experimental results, confirming its ability to capture actual cell performance. This newly presented empirical resistance‐based model provides a practical framework to simulate complicated electrolysis reactions, serving as a comprehensive guide for continuous improvement of water electrolysis.

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Section: Introductionmentioning

confidence: 99%

“…The losses caused by hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) strongly depend on electrode materials, operating conditions, and the electrolyzer . Moreover, the formation of gas bubbles, especially at high current densities, will require higher energy to sustain the same corresponding reaction rate …”

Section: Introductionmentioning

confidence: 99%

Experimental study and analytical modeling of an alkaline water electrolysis cell

Chen

Mojica

et al. 2017

Int J Energy Res

View full text Add to dashboard Cite

show abstract

“…Alkaline water electrolysis is one of the oldest and easiest techniques for producing hydrogen [29][30][31]. The current commercial alkaline water electrolysers mainly use aqueous solutions of sodium or potassium hydroxide as the state-of-the-art electrolyte [32]. Although alkaline water electrolysis exhibits an inherent low-cost characteristic, due to the simplicity of the process, the development of large-scale hydrogen production systems based on this technology still needs potential improvements in the overall cell efficiency through reducing the energy consumption and increasing the electrolyte ionic conductivity [17,33,34].…”

Section: *Manuscriptmentioning

confidence: 99%